HomeMy WebLinkAbout1.1 Drainage StudyI
I
I
I
I
I
I
I
T
I
I
I
I
t
T
I
I
I
I
Crvrl EnerruegRrNc
1517 Blake Avenue, Suite 101
Glenwood Springs, CO 81501
970.945.8676 phone
970.945.2555 fax
DRAINAGE STUDY
FOR THE
MONUMENT RIDGE SABDIWSION
GARFIELD COUNTY, COLORADO
HCE JOB NUMBER: 2000060.01
February 21,2005
Prepared for:
Monument Ridge, LLC
1586 County Road 300
Parachute, CO 81635
Prepared by:
,6rd A"'- '-..
Daniel R. Dennison, E.I.
Design Engineer
Larqo SuRvgvlttc
t.:.!i;,;:1,;.,,..,...,,'
14 Inverness Drive East, Suite F-120
Englewood, CO 80112
303.925.0544 phone
303.925.0547 fax
!
i
@
Employee-Omed Company
rD. Neal, P.E.
www.hceng.com
TABLE OF CONTENTS
INTRODUCTION
OFF-SITE BASINS
HYDROLOGY
DRAINAGE PLAN
SUMMARY
DRAWINGS:
PAGE
1
I
1
I
2
Vicinity Map 8-112" x 1 1"
S.C.S. Map 8-112" x 11"
FEMA Floodplain Map 8-l/2" x 1 1"
Offsite Basin Map 8-1/2" xl1"
Grading and Drainage Plan ll"x 17"
APPENDX: Calculations for existing and proposed conditions
I
I
t
I
I
I
I
I
T
I
T
I
T
I
T
I
I
t
I
I
I
I
I
I
I
I
I
I
I
T
t
I
T
I
t
I
I
I
INTRODUCTION
The proposed Monument Ridge Subdivision is located in Garfield County, approximately two miles
southeast of Parachute and bordering Battlement Mesa to the southeast. County Road 300 and County
Road 303 travel through the property and are the main access to the property. Undeveloped, partially
developed agriculturai residintial land, public land, and a residential subdivision surround the site. The
propor.d l8-0-acre development consistsof l7 residential lots. Please see the enclosed vicinity map for the
site location.
MAJOR OFF-SITE BASINS
The major drainage basin within this project with an established 10O-year floodplain is Monument Gulch
and its iributaries. This basin flows through the site, from east to northwest and eventually drains into the
Colorado River. Monument Gulch has been mapped and established by FEMA, Community-Panel
Number 080205 341A, effective December 15, 1977. Please see the enclosed flood plain map. The final
plat limits the construction on the site by creating no-build zones along the drainage paths of Monument
-Gulch
that are within the 100-year floodplain, have unstable soils, or are in danger of debris flows.
A second large drainage basin exists to the south boundary ofthe property. This basin does not create any
100-year floodplain arias according to the FEMA maps. However, the basin did create some no-build
areas on the sitl due to the debris flow hazards and unstable soils described in the CTL Thompson
Geotechnical Report number GS-3515. Figure I of CTL Thompson report mapped the soil conditions,
which are reflected on the Final Plat for Monument Ridge Subdivision.
HYDROLOGY
The hydrologic methods for this study are outlined in the Soil Conservation Service publication Procedures
for Determinine peak Flows in Coloiado (1980) and TR-55. Peak on-site flows in this area will be derived
prirnu.ity fromiainfall since the site is below 8000 feet in elevation. Therefore, the proposed drainage
improvements should be adequate to handle on-site spring snowmelt runoff.
DRAINAGE PLAN
The storm water runoff from this site will be, in general, unconcentrated sheet flow on the proposed lots
and runofffrom the roads, which will be captured by roadside swales. The 25-year flows for the existing
and proposed conditions are provided in the Appendix. Runofffrom the lots will in some cases flow to
irrigation ditches as it has hisiorically. Detention will not be required on this site because of the small
am6unt of development that will occur on site versus the large open areas that will be left as pasture. The
only improvements, proposed at this time, are two 600 foot +/- long shared access roads serving over two
loti and three shared driveways that serve 2 lots each. The addition of lawns and other individual lot
improvements will offset any impact created by the construction of roofs and driveways. Grading around
proposed buildings should provide positive drainage away from the buildings. Please see the drainage and
gruii;g pirn submitted with the Preliminary Plan application for additional informaiion.
There are four drainages that exist on the site. Monument Gulch is in the middle portion of the property
and should only affeci the existing County Road 300. One of its tributaries nears the north edge of the
property and alio will only affect the existing County Road 300. A small drainage does affect the
proposed Monument Ridge Road and Dry Creek Road as well as future individual lot driveways. A-dr"i.rug.
ditch and a seriei of culverts will be required to carry the runoff from this basin with a safety
factor of 1.5 for debris flow as recommended by the geotechnical engineer. The drainage along the south
boundary of the property does not affect any existing or proposed development.
SUMMARY
The drainage plan for Monument Ridge Subdivision consists of utilizing best management practices to
water qualiiy hom the proposed development, and providing storm water detention for the
additional developed flows. All the drainage improvements proposed for the subdivision are designed
to mitigate the adverse impacts on the site and surrounding areas.
DRAWINGS
I
I
I
I
I
t
I
t
I
I
I
I
t
I
I
I
I
I
I
I
t
I
I
I
I
I
I
T
I
I
I
I
t
I
I
t
I
I
SCS SOIL CLASSIFICATION'
55 - POTTS LOAM,3-62 SLOPES, DEEP WELL DBAINED, HYDROLOGIC GBOUP'B'
56 - POTTS LOAM, 6-127. SLOPES, DEEP WELL DBAINED, HYDHOLOGIC GROUP'B'
58 - POTTS ILDEFONSO COMPLEX, 12-25'I SLOPES, ALLWAL FANS, !.IYDHOLOGIC GROUP'B'
1":2000' DRAINz
MONUMENT RIDGE, LLC
PARACHUTE, COLORADO
NIONUMENT HDGE
SUBDMSON
scs sof,-s Map
HIGH COIJNTRY ENGINEEBNq NC.
923 COOPER A\ENUE
PHONE, (970) 945-8676
FAX' (970) 945-2555 DATE o2/16/o5
FILE NO.
2000060.o
I
I
t
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
- - -
I I
J;\SDSKPROJ\20@\o5O\dW9\GR-0I.dwg, 2plDms t2:2j:59 pf,t, dd
rIIIT I I r ITTII
Hg
IsI
c
lii8E r8S I
IiI
EH'flE$gEiE
ltlEE
Eaa; Ic.F
g
H$
El
Hffiffi?H#
sgfiEf#g:E
FiFtP
ffiTffti
i;;i,gi
H
i'i {i""',i""')""i f ;j\itf.(i(r \ i i i i (,"uu.'n'... :" .\*$imi,,' i({ilti/,
ilffi,.,'.-g.,l;i j, i I I i i {Z
iti,i,..(.
'/'" ,''' / ,,.i
cF
E9
h6
9sHd
e6
E9
;n
9o
9;
9d
I
hs
r
I'
l*
18
iH
tJ,>
o-
I
I,
il
,
'/ /"
/-/.",--.
t/,i { /
I '- \. \
**\:*, t { i/ilf
Z / .1" ., ./' t' . .." "'' i'l{ ,' /..;' i .,/ / /, ,. p .l
\*,* = *l*.'12,,,
',r!i i\\\.,'
iil\"-,\'t.i, r +T
i. '"-: \',' t E, t ,nE, i
[ ','r rL'i" \ \ rEo
\t:"*,,$t-
{, /,i'u'/i
='i;i,/;
F" ,,
.,bi. :,'-"i(,. )ii{
iL
':i:-,_,../ ":;;,/.r,'-:- ,
. 1 ''*'.: ../ ,.1
: t \\ . ?' I i 'i'' i. Ii ; \lt1/..:lt,,E,': ,.H:i/A/
-iJ'.,'
'iitt''!if
! | '*4i,**Fi I') . t,l
i-,-'I ',
-...r,.,r \,. JF
''/) iE,,ri
i)]r
Nfr-i.,,
ii'Fl\ iri\ !Ei... \tr'..
Gti i\*
\\\
: :/ !/llr
!ll-il
1... -..
_
,#.,fii ,'w
.ai . ar ,gi'
.-j .i 'i i t-,+
*.+'4 l'
, ! i i.,"\
i _... -, i \'i'-....t \:. \ ;.'/'..-.. \ .,,'1 \
q11l\\,tl'i,
i)',YE\i.,, \ -.='',';+$$$,,\E,'.j
l'..'\ ) i '
l' i r...
-,,.ffi*
l'.,"8". , i' ,;l:Fr,',..-i
L,'r
..Ei ,-....: /isi i r .iEi , J iit:({(.r
\".ri-,''\t.\r.
q',/,
I;:*...\\'N
,,'i \..' '- \ \,,4:..'' \, '. \, \,,4NN".' . -t.''r$.$*,l.::rrrr
MONUMENT RIDGE LLC.
PARACHLITE, CO
MONUMENT RTDGE SUBDWISION
GFIADING, DRAINAGE, AND
d%HrcHcour.r@W rrffi[];f:ffi*ff$"?ftffi'ffi:
APPENDIX
t
I
I
T
I
I
T
t
I
I
I
I
I
I
I
I
T
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
t
I
I
@
A il En p I qv c <) uI Rl Co' il P c il\'
suBlEcr 1robtrt Glc^l*ta^s
-
rAGE I oE I
/
PROJECT
sv 0R0 DATE Z/ut cK'D BY
JOB NO.2oooo 6O,o-z-
DATE
ENGLEwooD, CO
14 Invcrness Drive East, Suite F-120 . Englcwood, CO 80112
303.925.0544 phone . 303.925.0547 tax
'\I
)
z{ure
GLENwooD SPRTNGS, CO
1517 Btake Avenue, Suite 101 . Glenwood Springs, CO 81601
970.945.8676 phone . 970.945.2555 tax
;,
Ddt
nAtoli
i
tisifot
$i"i* A a,(.6tty,,
o',({si|<,
1,l:-l
itz,98
tii
?tfia*,1
&ie5,, t,( I
. ;..;.. , . ,
3i,4i*e:1 (r0
Batin :D
--,---.-.-i----j---
Bari* (
--^_- *i_ l-*
A,fftile I to1,58_ /rc*l 5^ ',( 0e(2 :,4 | ^,o({eaf , ei rt|iry. "-,7 pdt(./i,^(.ad
oi{&,*'e <8, !? Ac.€| ',T, --: C ,$,-T-tS f-r-
;)i?;- iii.-'IOO-t;l(t g, <{s'
(-uww,e ,n nbe< exf r#nT-titt,-6 1 (RoaE el,nr
:/: I
A i K;iri
)', I
tr:,1Lt+-v( nx l,i;,[i,, ;;,
1t:,4.le) :, B'asi,^!% €:'? :
"A; 6,1 i(--;,<1, z; j'.O =i tf,9\ CN
G,4 c;l t ;t 2,tf "6, B9j i6;;l (;xa. ,', O,,7''"'. Jt -' : : '"/r1, LB
"y"le i "s:il"; :h,.1 ._.
e aegh.erit lvl i66^i_1 (;Ve aid,- 11d,1 i6q i_ .! . -:- -. :. ...... : ..
=;6';1 iCrtu i .L+: +Lo si t, l.sa6 61
la6rz€43 tdi --rr,o-=-o*6t'
,^-e1 i ^wl
'ca-I i 2 1,20t,89
?*
;*"r
*r-"-*fl^il.e{-:; )*b:rai 98
t
''J *i
i ilLs{^;' (t^*1!l.: 'i "4,^\da 1l"L%-{T-:
ll s i Ei Lli:OQl 6)-- iKig ic N)
I
,i
'-"l----i"-- .6#
*.:
l
ft-l )_
i 6tau'
$^!,4,i7
:11
i,,ii;[
o_.e:6
s%
- - .1-*-'loa
oc:
0?
I
.,...?.8,i',-,,-,'
7"i 6?t^ i K;l C 9 iC t"l
16,.o^'c -li " "l- . .i "Q "/,8;:? : ,
Iii
t
112',ld Aa c t O',nA*"/-', - -: ^-:;"'"-
a
i?8i i
lriigr?""*
iiil
fiat )wr:le r Zc L2, Ac,..es tot'O4)*,*o(€r 1.6r
6rs i x 6*"r l-ns,lk:-*6-8:iii "!t"-A**.fi*
iiii
'lOO''Yv:
'*'"**-r' -l _ -*:.!.
' ://- i--'[^^af.f - 'Z'.
iii:
.61a;:8 '<(s
:l
Sos:o:Cl a-:-rrlej r.6-.1:.
j
'Ll' A*e r,**:--'-l- -t- ^"
i-.
*-
---,-,. ..---i-.,...'-i----'r-- "" "oJ,Qcvas
too-rl
r:1
.i...........:.......-....1.... ..
iod-ry
ira
,tt
.'-o.({r ?
(?n<il t)0nsile't,3t ^a{/-' il 'i-tiii $1
f-_ipasgd
iia*i
lli wi{}.;,-fias:r', iC
'"--; deWi*
C"l-ue"k
(lov-,. i j
;.:ti
..1:!}=}.ha. bzt
' iJ, i
,-l
{,-a<-ter ,"1
;i.v
oe::4^
(--;:(
i
tl (q,rlI,9t l@'(
9s r^t.-''':i 'o(l Q,<t +\4t VO\,gr @
I
,.di J
I
,l
Ot
r<
A
ri
,q \-l
I SOIL SURVEY32
tk
t
I
I
I
I
I
I
I
I
I
I
I
I
I
T
I
I
55-Potts loam, 3 to 6 percent slopes. This deep,
well drained, moderately sloping soil is on mesas, bench-
es, and sides of valleys. Elevation ranges from 5,000 to
7,000 feet. This soil formed in alluvium derived from
sandstone, shale, or basalt. The average annual precipi-
tation is about 14 inches, the average annual air tem-
perature is about 46 degrees F, and the average frost'
free period is about 120 days.
Typically, the surface layer is brown loam about 4
inches thick. The subsoil is reddish brown clay loam
about 24 inches thick. The substratum is pinkish white
loam to a depth of 60 inches.
lncluded with this soil in mapping are small areas of
Olney, Kim, and lldefonso soils that have slopes of 3 to
6 peicent. These areas make up 10 to 15 percent of the
map unit.
Permeability is moderate, and available water capacity
is high. Effective rooting depth is 60 inches or more.
Surface runoff is slow, and the erosion hazard is moder-
ate.
This soil is used mainly for irrigated crops and hay and
for dryland farming (fig, 10). Alfalfa, small grains, and
grass-iegume hay are grown. Small areas are used for
grazing.- Theie soils are usually irrigated by flooding. Drop
structures in irrigation ditches, grassed waterways, and
minimum tillage prevent serious erosion' lrrigation water
should be carefully managed to avoid piping and erosion.
Cover crops or stubble mulching also help to limit ero-
sion in dryfarmed areas.
The native vegetation on this soil is mainly wheat-
grass, needleandthread, and sagebrush.- When range condition deteriorates, forbs and shrubs
increase. When the range is in poor condition, undesira'
ble weeds and annual plants are numerous' Properly
managing grazing maintains and improves range condi-
tion. Reducing brush improves the range. Seeding im-
proves range in poor condition. Crested wheatgrass,
western wheatgrass, and Russian wildrye are suitable for
seeding. Preparing a seedbed and drilling the seed are
good practices.
Pheasant, mourning dove, cottontail rabbit, some mule
deer, and squirrel find habitat on this soil.
Community development and recreation are limited by
low strength and the shrink-swell potential. Dwellings
and roads can be designed to overcome these limita-
tions. Community sewage systems witl be needed if the
population density increases.
This soil is in capability subclasses llle, irrigated, and
lVe, nonirrigated.
56-Potts loam, 6 to 12 percent slopes. This deep,
well drained, moderately sloping to rolling soil is on
mesas, benches, and sides of valleys. Elevation ranges
from 5,000 to 7,000 feet. This soil formed in alluvium
derived from sandstone, shale, or basalt. The average
annual precipitation is about 14 inches, the average
annual air temperature is about 46 degrees F, and the
average frost-free period is about 120 days.
Typically, the surface layer is brown loam about 4
inches thick. The subsoil is reddish brown clay loam
about 24 inches thick. The substratum is pinkish white
loam to a depth of 60 inches.
lncluded with this soil in mapping are small areas of
Kim, Olney, and lldefonso soils that have slopes of 6 to
12 percent. These areas make up 10 to 15 percent of
the map unit.
Permeability is moderate, and available water capacity
is high. Effective rooting depth is 60 inches or more.
Surface runotf is medium, and the erosion hazard is
severe.
This soil is used mainly for grazing, wildlife habitat, and
some dryland farming (fig. 10). Wheat, barley, and oats
are grown.
Minimum contour tillage and stubble mulching help to
prevent excessive erosion.
The native vegetation on this soil is mainly wheat-
grass, needleandthread, and sagebrush.- When range condition deteriorates, forbs and shrubs
increase. When the range is in poor condition, undesira'
ble weeds and annual plants are numerous. Properly
managing grazing improves and maintains range ccndi'
tion. Reducing brush improves range. Seeding improves
range in poor condition. Crested wheatgrass, westerr
wheatgrass, and Russian wildrye are suitable for seed'
ing. Preparing a seedbed and drilling the seed are gooc
practices.
Community development and recreation are limited b1
low strength, shrink-swell potential, and slope. Dwellings
and roads can be designed to overcome these limita
tions. Community sewage systems will be needed if tht
population density increases.
This soil is in capability subclass lVe, irrigated ant
nonirrigated
S7-Potts-lldefonso complex, 3 to 12 Percen
slopes. These gently sloping to rolling soils are ot
mesas and sides of valleys. Elevation ranges from 5,001
to 6,500 feet. The Potts soil formed in alluvium derive'
from sandstone, shale, or basalt. The lldefonso so
formed in very strongly calcareous, basaltic alluvium an
small amounts of eolian material. The average annu.
precipitation is about 14 inches, the average annual a
temperature is about 46 degrees F, and the averag
frost-free period is about 120 days.
The Potts soil makes up about 60 percent of the ma
unit, and the lldefonso soils makes up about 30 percen
The Potts soil is on slightly concave positions, and th
lldefonso soil is on the breaks of steeper slopes.
The Potts soil is deep and well drained. Typically, tl'
surface layer is brown loam about 4 inches thick. Tl
subsoil is reddish brown clay loam about 24 inches thic
The substratum is pinkish white loam that extends to
depth of 60 inches.
T l
El!ffi'lt'
l;ffi
'1 'l#:-'
.'lEil'.::
Gff; F'FLE AREA' coLoBADo
i;. .j.,.!,tI
I
I
I
I
I
l',"
;:
I,
li,'*
t,i--
Permeability of the Potts soil is moderate' and availa-'
ufJ "li.i ."p".iV is high' Etf.ective rooting depth is.Q0
"i,i.nli'"i ;;;. surtace" runotf is slow' and the erosion
hazard is moderate."*T;; fiOetonso soil is deep and well drained' Typically'
tnJ'*.t"Iii raye. 1. brown stony lo.am about 8 inches
i'd[x. rn" underlying material is white' calcareous very
.ionv fo"* that erteiOs to a depth.of 60 inches'
"'"p*i'',n'iiiritv oi tn"lid"fonto' soil is moderately rapid'
and- availabt6 wat"i capacity is low'.Effective rooting
ilitii. "uout
oo incnes. Surface runotf is slow' and the
erosion hazard is moderate'-'ii,]-r,ro"o nitn tni. ioiiin mapping are. small areas ol
Oril"v-""J Kim soils that have dtbpe! of 3 to 12 percent'
iGt "i"". mare up s to 15 p6rce.nt .of the map unit'
These soils are uSeJ mainrv'for limited grazing and
wildlife habitat.
The native vegetation on the Potts soil is mainly
*n""lgr;;, - n""tr""nothread, and sagebygn' . r!9
n"ti*"r"gdtation on the lldefonso soil is mainly pinyon
"iJ ut"n-irniper and an understory ol lndian ricegrass'
iln"aigii.i, lunegraJs, serviceberry' bitterbrush' and sa-
oebrush,"-wh;; the understory vegetation deteriorates' g-rasses
almost disappear anO forUiand shrubs increase' Proper-
ry ;;tsild srazins maintains ",ng-lT?Io"s
range con-
dition on uotn soits. seeoing improves range on the
FJttJ .oif it it is in poor condition' Crested wheatgrass'
western wheatgrass,'and Russian wildrye are suitable for
;;;ilg erepa-ring-i seedbed and drilling -the seed are
;;;';;""iilLl. fieoucins brush on the Potts soil im'
iiored the range. eropeity managing the vegetation on
in" rrJ"ionro s-oit maiirtains wood production and graz'
;il 5"i""ti*rv thinning pinvon and
-iuniper lfPrgvg:
gra;i"g ino drovioes iirewood, Posts' and Christmas
trees.- Th; lldelonso soil is suited to production of pinyon and
Utahiunioer.ltcanproducegcordsofwoodperacre
*ii"n'tt"'es more than 4.5 feet tall Leach an average
Ji"",Ltii t"t one toot) ot 5 inches' The low available
*.i"i t"p.iity atfects survival of tree seedlings'
Urf" t*t, wild turkey, chukar, gray squinel' cottontail
t.Uoii, anO iorn" pneltant find liabitat on these soils'-boiil.r"ity-a"r"ioprent is limit"d on the Potts soil by
tow strenotn. snrinf'iwell potential, and slope'.Communi-
tv b"r"r"irlnt i. limited on the lldefonso soil by steep
slopes.-'Tn]l'"orplex is in capability subclass Vle' nonirrigated'
S8-Potts'lldefonso complex, 12 !o 25 Percent
sfofes. These strongly sloping to. hilY, :9ilt ,1:^.,::meias, alluvial fans, and sidel.of -valleys',:lt]I9iranges from 5,000 to 6,500 feet' The Potts soil tormeo ln
alluvium derived trom'sanOstone, shale, or basalt' The
lldefonso soil formed in uery strongly calcareous' basaltic
alluvium and small amounti of eolian material' The aver'
"g" "^";f precipitation is about 14 inches' the average
annual air temperature is about 46 degrees F' and the
ir.t"g"ltost-fiee period is about 120 days'
The Potts soil maxe-s up aUout 60 percent of this unit'
and the lldefonso .oit-r-ix". up about 30 percent. .The
F;lt t;il ii in stigniiv'contaue positions' and the llde'
fonso soil is on the breaks of steeper sloPes''-i'n. p"ttl ioit is OeLp anO well'drained. Typic.ally, the
surtace UyLr is Urown'toam about 4 inches thick' The
;il;;it is-ieoaisn brown ttay toa' about 24 inches thick'
i-n" iruitt"tum is pnri.n *hite loam to a depth of 60
inches."'iermeaUitity of the Potts soil is moderate' and availa-'
bd;;i;;;ip..itv it nGr'' Etfective rootins depth is 6o
inin"t
-ot
mdre' surlaci runotf is medium' and the ero'
sion hazard is moderate-' rn. rrJ"ionso soiiis-deep and well drained' Typically'
th;';il;; liyer is uto"tt stony lo.am about I inches
i'ilLx. iri" underlying material is white' calcareous very
itony toam to a dePth of 60 inches'-'i.jrr""Uility of inl iOetonso soil is moderately rapid,
and available watei capacity is low' .Etfective rooting
i"Itn it
"uout
oo incnes'-suit""" runotf is medium' and
the erosion hazard is moderate'
lncluded with this- toif
-in mapping are small areas ol
Morval and uazeai .oitt' fn"' Morval soils are at the
i;ffi;; i.r"ti*.. Tni Lazear soils are shallow and are
on- riOge crests and steep mountainsides' These areas
;;i;i, io to t 8 percent of the map..unit'
Thesesoilsareusedmainlyforlimitedgrazinganc
wildlife habitat.
The native vegetation on the Potts soil is mainl'
wheatgrass, n""OJeanOthread' and .. sagebrush' . Tht
native vegetation o"lnl lldefonso soil'is mainly pinyot
"nO
Ut"n-irniper and an understory of lndian ricegrass
"n.aigi"t;, lunegiaJs, serviceberry' bitterbrush' and se
gebrush.- When the understory vegetation deteriorates' grasse
almost disappear anO iorOiand shrubs increase' Prope
il ;;"gils'grazing maintains qnqiTPto'es ranse cor
dition on both soiis. seeding improves range in !.o,
condition in less lioping areis of the Potts soil' Blut
bunch wheatgrasi, 'weitern wheatgrass' and neel
leandthread are
'luitaUt" to' seeding' Preparing ^tl
.EOb"O and orillini the seed .are good practices'. Co
itoll'rg Lrusn on iii" Potts soil improves range that
producing more shrubs than are. normally- found in tl
potential pfant com-munity' e'op"tly managing.the undt
ctorv veoetation on the'lldelonso soil maintains wot
ililttd;-ano grazing' Selectively. thinning pinyon a
irnip"t improves't'a'ing and provides firewood' pos
and Christmas trees.
The lldelonso soil is suited to prod.uction of pinyon a
Utanluniper. lt can produce 9 cords of wood per a(
when trees more than 4'5 feet tall reach an avera
diameter (at on; tooO of 5. inches' The low availa
*"iJit"p".ity atfects survival ol tree seedlings'
33
I,,
I ',lji
I
I
I
I
t
I
I
I
I
I
I
I
T
I
I
I
t
I
I
I
I
I
SOIL SURVEY34
Mule deer, wild turkey, chukar, gray squirrel, cottontail
rabbit, and some pheasant find habitat on thebe soils.
The steep slopes limit community development. Struc'
Itures are needed to divert runofl to minimize gullying and
erosion.
This complex is in capability subclass Vle, nonirrigated.
S9-Potts-lldefonso complex, 25 to 45 percent
stopes. These hilly to very steep soils are on alluvial
fani and sides of valleys. Elevation ranges from 5,000 to
6,500 feet. The Potts soil formed in alluvium derived
from sandstone, shale, or basalt. The lldefonso soil
:formed in very strongly calcareous, basaltic alluvium and
small amounis of eolian material. The average annual
'precipitation is about 14 inches, the average annual air
temperature is about 46 degrees F, and the average
frost-free period is about 120 days.
The Potts soil makes up about 60 percent of the map
unit, and the lldefonso soil makes up about 30 percent.
The Potts soil is in slightly concave positions, and the
lldefonso soil is in the steeper, breaklike areas.
The Potts soil is deep and well drained. Typically, the
surface layer is brown loam about 4 inches thick. The
subsoil is ieddish brown clay loam about 24 inches thick.
The substratum is pinkish white loam to a depth of 60
inches.
Permeability of the Potts soil is moderate, and availa-
ble water capacity is high. Etfective rooting depth is 60
inches or more. Surface runoff is medium, and the ero-
sion hazard is severe.
The lldefonso soil is deep and well drained. Typically'
the surface layer is brown stony loam about I inches
thick. The underlying material is white, very strongly cal'
careous very stony loam to a depth of 60 inches.
Permeabiiity of the lldefonso soil is moderately rapid,
and available water capacity is low, Etfective rooting
, depth is about 60 inches. Surface runotf is medium to
rapid, and the erosion hazard is severe.'lncluded with this soil in mapping are small areas of
Morval and Lazear soils. The Morval soils are at the
higher elevations. The Lazear soils are shallow and are
on ridge crests and steep mountainsides. These areas
make up 10 to 1 I percent of the map unit.
These soils are used mainly for limited grazing and
wildlife habitat.
The native vegetation on the Potts soil is mainly
wheatgrass, needleandthread, and sagebrush. . The
native-vegetation on the lldefonso soil is mainly pinyon
and Utah-juniper and an understory of lndian ricegrass,
wheatgrass, junegrass, serviceberry, bitterbrush, and sa'
gebrush.
When the understory vegetation deteriorates, grasses
almost disappear and forbs and shrubs increase. Proper'
ly managing grazing on the Potts soil maintains and
iinproves the -range condition. Properly managing .the
vegetation on the lldefonso soil maintains wood produc'
tioi and ground cover. The value for grazing is low
because of steep slopes and the tree canopy' Firewood,
posts, and Christmas trees can be harvested lrom the
more gently sloPing areas.
Thdlldeaonso soil is suited to production of pinyon and
Utah juniper. lt can produce 9 cords of wood per acre
when trees more than 4.5 feet tall reach an average
diameter (at one foot)'of 5 inches. The low available
water capacity atfects survival of tree seedlings. Steep
slopes and the severe erosion atfect harvesting.
Mule deer, wild turkey, chukar, gray squirrel, cottontail
rabbit, and some pheasant find habitat on these soils.
Community development is limited by very steep
slopes.
This complex is in capability subclass Vlle, nonirrigat'
ed.
60-Rhone loam, 5 to 30 percent stopes. This deep,
well drained, gently sloping to steep soil is on mountain'
sides and ridges. Elevation ranges from 7,600 to 8,600
feet. This so'rl lormed in residuum from sandstone and
marlstone. The average annual precipitation is about 20
inches, the average annual air temperature is about 40
degrees F, and the average frost-free period is less than
75 days.
Typically, the upper part of the surface layer is brown
toam about 8 inches thick, and the lower part is brown
sandy clay loam about 20 inches thick. The underlying
mateiial ii brown extremely channery sandy clay loam
about 24 inches thick. Sandstone is at a depth of 52
inches.
lncluded with this soil in mapping are small areas of
Parachute and Northwater soils. The moderately deep
Parachute soils are on smooth ridge crests and west'
and south-facing side slopes. The Northwater soils are
on north-facing iiOe slopes. These areas make up about
1O to 15 percent of the maP unit.
eermeibitity is moderate, and available water capacity
is moderate. Etfective rooting depth is 40 to 60 inches.
Surface runotf is slow, and the erosion hazard is slight'
This soil is used mainly lor wildlife habitat and limited
grazing.- The- native vegetation is mainly brome, needlegrass,
and sagebrush. There are small areas of dwarfed aspen,
but they are of little or no commercial value.
When range condition deteriorates, forbs, shrubs, and
Kentucky bluegrass increase. Properly manqging.grazing
maintains and improves range condition. Seeding and
removing brush improve range on less sloping areas if it
is in po-or condition. lntermediate wheatgrass, slender
wheatgrass, and mountain or smooth brome are suitable
for se6ding. Preparing the seedbed and drilling the seed
are good practices.
Elk, mule deer, coyote, grouse, and rabbit find habitat
on this soil.
Use of this soil for community development or as a
source of construction material is limited by steeP
slopes.
l; ;,
I"i*i
1."
FIFLE AREA, COLORADO
Permeability of the Potts soil is moderate' and availa-
urJ *liIi l"p""itv is high' Etf.ective rooting depth is.60
ii.nJJ'", il;. Su,i"CJ runotf is slow' and the erosion
hazard is moderate','*T;;rii"ionro ,oil is deep and welt drained. Typically,
n"'trttl.ii tayer is brown stony loam about 8 inches
i'n[r.-fn" ,noLttyins material is white' calcareous very
lionv fo". that eite-nds to a depth.of 60 inches'
"'-p.i,.ri""Uifitv of tne-tiOeJonso soil is moderately rapid'
and- avaitaut6 watei Japacity is low' .Effective rooting
ilitn i.
"Etut
60 inches' Surtace runotf is slow' and the
erosion hazard is moderate'"'il;ild;tt itn tni.loiiin mapping are small areas of
ol;;-;;J Kim soirs tnat na'e dtbpe! of 3 to 12 percent'
ih;;L;;;rJ mare-up-s to t5 p6rcent.of the map unit'
These soils are uSeJ mainry'for limited grazing and
wildlife habitat.
The native vegetation on the Potts soil is mainly
*nt"igt;i, - n""oi""nothread, and sageblugn' . r!9
;;G";g;tation on-the lldefonso soil is mainly pinyon
.ni Ut"n"irniper and an understory of lndian ricegrass'
iln""tgii.i, lunegrass, serviceberry' bitterbrush' and sa'
gebrush,' Wh"n the understory vegetation deteriorates' grasses
almost disappear anO forUiand shrubs increase' Proper-
il ;;tgG'srazins maintains
".!9-lT?-to'"s
ranse con'
dition on uotn soiis. seeding improves range on the
Fott. .oil ir lt is in poor condition. Crested wheatgrass'
western wheatgrass,'anO nussian wildrye are suitable for
;;;ilg Fr"p"-ting-aieedbed and dritling -the seed are
iiiJ iir.tilLi' fieoucins brush on the Potts soil im'
oroves the range' Croper-ty managing the vegetation on
Ih;'iil"i;il siii maiitains wood pioduction and graz-
i^d. Sei"ctir"rv thinning pinvon and iuniper .lIPrPVe:
gtLi^g inO drovioes iirdwobo, posts' and Christmas
trees.
Thelldefonsosoilissuitedtoproductionofpinyonand
ut"nlrnip"i. tt .in produce 9 cords of wood per acre
, when trees more th'an 4'5 feet tall reach an average
diameter (at one t6otl ot 5 . inches' The low available
*"i"it"pi.ity atfects iurvival of tree seedlings'
r'ar'irJT"o, witd-tu*ei, chukar, gray squinel' cottontail
rabbit, and some ;h;;';;t' flno' fi"t'lt"t'on these soils'
-boinmunitv a"relopmeni is limited on the Potts soil by
ro* iii"nliri, trnin-i-J""rl fotential, and slope'.Communi-
t a;#h'ent iJ timited on the lldefonso soil by steep
slopes.-'fn]i'"orplex is in capability subclass Vle' nonirrigated'
S8-Potts'lldefonso complex, 12 !o 25 percent
:*:r i[:,x ?[T n'l J' "s["1'& ]y,d:l: :E,ililil
rangei trom S,OOO to'O,SOO feet' The Potts soil formed in
alluvium derived tront'sanOstone, shale' or basalt' The
iiOeiJ"so soil tormed in very strongly calcareous' basaltic
atluvium and small amounti of eoiian material' The aver'
;g;-il;i precipitation is about 14 inches' the average
annual air temperature is about 46- -degrees
F' and the
Ir.t"g"ltost-fiee period is about 120 days'
The Potts soil mafeiup about 60 percent of this unit'
andthelldefonso'oit-,-"x"'upabout30percent.The
P;[t t;il; in stigniiv conca'" positions' and the llde-
fonso soil is on the breaks of steeper slopes''-fi; P"G .oir i. oeep ano well'drained' Typically' the
surtaie taylr is urown-toa' about 4 inches thick' The
;il;;ii is-i"ooiin utown crav loam about 24 inches thick'
The substratum is gnXitn white loam to a depth of 60
inches."'-pJrmeaUility ol the Potts soil is moderate' and ayait^1
bd;;i;;;"p"iitv is nigr'' Efrective rooting depth is 6o
inln".
-ot
mdre. surtaci runotf is medium' and the ero-
sion hazard is moderate'-' ii'r.Tra"ionso soiiii-d""p and well drained' Typicallv'
th;'il;; layer is ur,o*n stony loam about 8 inches
i'i[r.-inJ unoLr[ing material is white' calcareous very
itony loam to a dePth of 60 inches'-'i,irr""Oifit, ot inl ttO"tonro soil is moderately rapid,
and available watei capacity is low' .Effective rooting
i"itn i,
"Oout
6O inchei-Sultac" runoff is medium, and
the erosion hazard is moderate'
lncluded with this-.oif
-in mapping are small areas of
Morval and uazear ioitt' fn"' Morval soils are at the
ffi#'"T"J"tio*. rne uazear soils are. shallow and are
ori riage crests and steep mountajnsides' These areas
;;i;;a io to t I Percent of the maP.unit'
inlib soils are used mainly for limited grazing anc
wildlife habitat.
The native vegetation on the Potts soil is mainl'
wheatgrass, n""Of""nJthread' and .. sagebrush' . Tht
native vegetation Jnln" lldefonso soil'is mainly pinyot
"nJ
Ut"n-irniper and an understory of lndian ricegrass
wheatgrass, iunegiass, serviceberry' bitterbrush' and s€
gebrush.- When the understory vegetation deteriorates' g-rasse
almost disappear anO iorUiand shrubs increase' Prope
il';;ir6lrazing maintains and improves range col
dition on both soiis. seeding improves range ln !.o,
condition in less sioping areis oi the Potts soil' Blur
bunch wheatgrasi, 'weltern wheatgrass' and neer
S"uUf :1, m - * ;:".*t pE"3:1'J r',|:!i!ili
it"ll'rng brusn on th"e Potts soil improves range that
producing more shrubs than are normally lound in tl
potential ptant c#m'nity' ptop"rly m-anaging-the undt
ltorv ,.Sj"tation on the'lldefonsg sgil maintains wo'
ilfut'i.il'ano grazinq' Selectively thinning pinyon a
iuniper improves'grazing and provides firewood' pos
and Christmas trees'
The lldefonto ioif is suited to prod.uction of pinyon a
Utanluniper' tt can produce 9 cords of wood per a(
when trees ,ot" than 4'5 feet tall reach an avera
diameter (at one tootl of 5 . inches' The low availa
;;i;;;;d;itv affects survival of tree seedlinss'
I
I
I
I
I
l'
l', :
l-
I
t
l,{:,,#
I ,''
, , ...r.i:i-
34
I
t
I
I
I
SOIL SURVEY
I
Mule deer, wild turkey, chukar, gray squirrel, cottontail
rabbit, and some pheasant find habitat on these soils.
The steep slopes limit community development. Struc'
tures are needed to divert runotf to minimize gullying and
erosion.
This complex is in capability subclass Vle, nonirrigated'
S9-Potts-lldefonso complex, 25 to 45 percent
stopes. These hilly to very steep soils are on alluvial
fani and sides of valleys. Elevation ranges lrom 5,000 to
6,500 feet. The Potts soil formed in alluvium derived
from sandstone, shale, or basalt. The lldefonso soil
formed in very strongly calcareous, basaltic alluvium and
small amounis of eo[ian material. The average annual
precipitation is about 14 inches, the average annual air
iemperature is about 46 degrees F, and the average
frost-free period is about 120 days.
The Potts soil makes up about 60 percent of the map
unit, and the lldefonso soil makes up about 30 percent.
The Potts soil is in slightly concave positions, and the
lldefonso soil is in the steeper, breaklike areas.
The Potts soil is deep and well drained. Typically, the
surface layer is brown loam about 4 inches thick. The
subsoil is ieddish brown clay loam about 24 inches thick.
The substratum is pinkish white loam to a depth of 60
inches.
Permeability of the Potts soil is moderate, and availa-
ble water caiacity is high. Etfective rooting depth is 60
inches or more. Surface runoff is medium, and the ero-
sion hazard is severe.
The lldefonso soil is deep and well drained. Typically'
the surface layer is brown stony loam about I inches
thick. The underlying material is white, very strongly cal'
careous very stony loam to a depth of 60 inches.
Permeabiiity of the lldefonso soil is moderately rapid,
and available water capacity is low' Etfective rooting
depth is about 60 inches. Surface runotf is medium to
rapid, and the erosion hazard is severe.
lncluded with this soil in mapping are small areas of
Morval and Lazear soils. The Morval soils are at the
higher elevations. The Lazear soils are shallow and are
on ridge crests and steep mountainsides. These areas
make up 10 to 18 percent of the map unit.
Thesb soils are used mainly for limited grazing and
wildlife habitat.
The native vegetation on the Potts soil is mainly
wheatgrass, needleandthread, and sagebrush. . The
native vegetation on the lldefonso soil is mainly pinyon
and Utah-iuniper and an understory of lndian ricegrass,
wheatgrasi, iunegrass, serviceberry, bitterbrush' and sa'
gebrush.
When the understory vegetation deteriorates, grasses
almost disappear and forbs and shrubs increase. Proper'
ly managing' grazing on the Potts soil maintains and
ihproveJ the -range condition. Properly managing .the
vegetation on the lldefonso soil maintains wood produc'
tioi and ground cover. The value for grazing is low
because of steep slopes and the tree canopy' Firewood'
posts, and Chriitmas trees can be harvested from the
more gently sloping areas.
Thdlldefonso soil is suited to production of pinyon and
Utah iuniper. lt can produce 9 cords of wood per acre
when trees more than 4.5 feet tall reach an average
diameter (at one foot)'of 5 inches. The low available
water capacity affects survival of tree seedlings. Steep
slopes and the severe erosion atfect harvesting.
Mule deer, wild turkey, chukar, gray squirrel, cottontail
rabbit, and some pheasant find habitat on these soils'
Community development is limited by very steep
slopes.
ihis complex is in capability subclass Vlle, nonirrigat'
ed.
60-Rhone loam, 5 to 30 percent slopes. This deep,
well drained, gently sloping to steep soil is on mountain'
sides and ridges.
-Elevation ranges from 7,600 to 8,600
feet. This soil formed in residuum from sandstone and
marlstone. The average annual precipitation is about 20
inches, the average annual air temperature is about 40
degrees F, and the average frost'free period is Iess than
75 days.
Typically, the upper part of the surface layer is brown
loair'about 8 inches thick, and the lower part is brown
sandy clay loam about 20 inches thick. The underlying
mateiial ii brown extremely channery sandy clay loam
about 24 inches thick. Sandstone is at a depth of 52
inches.
lncluded with this soil in mapping are small areas of
Parachute and Northwater soils. The moderately deep
Parachute soils are on smooth ridge crests and west-
and south-facing side slopes. The Northwater soils are
on north-facing iiOe slopes. These areas make up about
10 to 15 percent of the maP unit.
eermeiUitity is moderate, and available water capacity
is moderate.-Etfective rooting depth is 40 to 60 inches'
Surface runotf is slow, and the erosion hazard is slight'
This soil is used mainly for wildlife habitat and limited
grazin!.- The- native vegetation is mainly brome, needlegrass'
and sagebrush. There are small areas of dwarfed aspen,
but they are of little or no commercial value.
When range condition deteriorates, forbs, shrubs, and
Kentucky bluegrass increase. Properly manqging..grazing
maintains and improves range condition. Seeding and
removing brush improve range on less sloping areas if it
is in pobr condition. lntermediate wheatgrass' slender
wheatgrass, and mountain or smooth brome are suitable
lor se6ding. Preparing the seedbed and drilling the seed
are good practices.
Elk, mule deer, coyote, grouse, and rabbit find habitat
on this soil.
Use of this soil for community development or as a
source of construction material is limited by steep
slopes.
I
I
I
T
I
I
I
I
t
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
TABLE 7.--BUILDING SITE DEYEL0PHEIIT--Contlnued
Ltoon
44---------
Horval
Hoderate:too clayey.
SItEht,
ShalIow
excavatlons
DreIl lngsrithout
Severe:shrtnk-sweII.
Hoderatc:
shrlnk-sweI1.
Hoderabe:shrlnk-slrell,
s1ope.
Severe:
slope,
large
SI tght-
Severe:
sIope.
Severe:slope.
stones.
S1ight-----
S1 lght,----------
Moderate:
slope.
Severe:slope.
Severe:
slope.
Moderate i
s1ope,shrlnk-svell.
SI lght----------
DweIIlngsrlth
Severe:shrlnk-sseII.
Hoderate:shrlnk-sreII.
Hoderate:shrtnk-sweII,
slope.
Severe:
slope,large sbones.
SI I BhE--------
Severe:
s Iope .
Severe:
s1ope.
SI t ght-----
S I i ghE-----
Hoderate:
sIope.
Severe:
slope,depth Eo rock.
Severe:
slope,
depth to rock.
Hoderate:
slope,
depgh to rock,shrlnk-sreII.
Sl lght----------
S I lgh E---- ------
SoalI
conmercl al
Severe:
shr 1nk-sreI I .
Hoderate:
slope,
shrlnk-swe11.
Severe:
slope,large stones.
SI tght---
Severe: "
slope.
Severe:
slope.
SllBht-----
Sl ighC------ --
Severe:
slope.
Severe:
slope.
'Severe:
slope.
Severe:
slope.
SI I ght-----
Hoderate:
sIope.
Severe:
slope.
l{od eratc :
slope.
Severe:
slope,large stones.
Local roads
and streets
Mod'erate:
slope.
Sl tght .
Severe:large sUones.
SI lEht-----
Severe:
loH strength.
shr lnk-swel1.
Modcrabe:
loH strength.
shrlnk-swe1I,frosE actlon.
Hoderate:
IoH st,rength,
shrtnk-swelI,
sIoPe.
Severe:
sIope,
Iarge stones.
SltEhb.
Severe:
slope.
Severe:
sIope.
Slight.
SIight.
Hoderate:
slope.
Severe:
slope.
Severe:
. s1ope.
l,lodbrabe:
slope,frosE actlon 'shrlnk-sweIl.
SIlght.
SItght.
Trldel 1----
46--------------
Nth111
48---------
NorthHater
49---------
0Iney
50--------------
0Iney
5 1 ---------0lney
52---------
Par achute
53r:
Par achute----
thone-----
56---------
Potts
57r:
Potts -----------
Severe:
sIope,
Iarge stones.
Seve re :
cutbanks
Severe:
slope,
cutbanks
Severe:
slope.
cave.
SIight-----
SIight-----
l{oderaue:
s1ope.
Severe:
slope ,depLh to rock.
Severe:
slope,depth to rock.
l{oderate:
s lope ,depth to rock.
S1 I ght----------
..ai.ll
:.:. .
I
t,
la
I
I
I
I
S1 lght---------
Hoderale:
slope.
S1lght-----
Severe:large stones.
l{oderate:
slope.
Sl lght----------
Severc ilarge stones.
Hoderate:
sIope.
S1 I ght--------
Severe:large stones.
I ldefonso-----
See footnotc ag €nd of table.
naae and !
synbo I
cave.
SoTI
nap
--!1.1i
.Titfi
.:.il'1r,i"t
I
Jue
nnen, coLoRADo
Jdefonso------
,61'---""'---
J:'"
ock outcrop.
I::::::::.11.. -ilas
:orriorthenbs.
l:::".::.:";
t'
[]':::::",
iale
1,,,
roltay----
litr. erevs------
Severe:
sIope.
Severe:
slope,large stones.
Severe:
slope.
Hoderate:floods.
Severe:slope.
SIight-
Hoderate:
slope.
Severe:
sIope.
Severe:
s1ope.
Severe !
sIope.
Severe i
vetness.
];;;--------
l.
Jrrif
Iuvents
I
I
I
TABLE ?.--BUILDING SITE DEVEL0PI{ENT--Contlnued
SeYere:
slope.
Severe:
slope,large siones.
Severe:
slope.
Severe:
floods.
Severe:
sIope.
SI i ght
Moderate:
slope.
Sever e :
s1ope.
Severe:
slope.
Severe:
slope,
shrtnk-sue11.
Severe:floods.
I
r See descriptlon of the Bap unlg for conpositton and behavlor characBerlstlcs of the Eap unlt.
l l Loo"l "o"d"r-;;; svnbor i excavattons i o:llH:t. i o":lll"r" i i:ll:l;l3' i ""0 "t'""'"
itill
Severe:
slope.
Severe:
slope,
Iarge stones.
Severe:
sIope.
Severe:
floods.
Severe:
s1ope.
SIlght
Hoderate:
slope.
Severe:
s1ope.
Severe:
sIope.
Severe:
s1ope,
shrlnk-swe11.
Severe:
floods,
raetness.i!il
Severe:
sIope.
Severe:
slope,large stones.
Severe:
slope.
Severe:floods.
Severe:
s Iope.
Moder a Le:
slope.
Severe !
sIope.
Severe:
s1ope.
Severe:
s1ope.
Severe:
slope,shrink-sHeI1.
Severe:
floods.
Severe:
slope.
Severe:
s1ope,large stones.
Severe:
sIope.
Severe:floods.
Severe:
slope,loY strengEh.
Moderate:
LoH strength.
Hoderate:
slope,
1or. strengBh.
SeYere:
slope.
Severe:
slope,loH strength.
Severe:
slope,Iow strength,
shrlnk-sve11.
Severe:
floods,frost actlon.
I
I
I
I
I
112
54, 55-----
Potts
Potts------
I lde fonso--
I Idefonso--
5gr:
PoLEs ------
I lde fonso--
60---------
Rhone
61---------
Rhone
62r:
Rock outcrop.
Torrlorthents.
63------
Sllas
64---------
Tanna
65r.Torrlfluvents
66 r:
Torrlorthents.
C aoborthlds.
Rock outcrop.
67)tTorrlorthents.
Rock outcrop.
TABLE 8.--SANITARI FACILITIES--Contlnued
l{oderate:percs slowly.
Hoderate:slopc,
Percs sloHly.
Moderate:percs slowly.
Severe:
s1ope,Iarge sLones.
Severe:
slope.
Severe:
slope,large sEones.
Severe:
sIope.
Severe:
slope,Iarge stones.
Severe:
depEh to
slope.
Severe:depth Eo
slope.
rock,
rock,
Severe:
floods.
Severe:depth to rock,
Percs !lorrly,
slope.
Hoderate:
slope,
seepage.
Severe:
s lopc .
Severe:
slope.
Severe:
slope,
seePage.
Severe:
slope.
Severe:
slope,
seepage.
S11 ght----------
SI ight----------
Severe:large stones.
Hoderate:
sIope.
Sl lght-----
Hodcrate:
s1ope.
Good.
Poor:large stones.
Poor:
s Iope .
Poor:
slope,large stones.
Poor:
sIope.
Poor:
slope,large slones.
Poor:
slope.
Poor:
sI.ope.
Good.
Poor:
sIope,thin J.ayer 'area reclaln.
SIlght----- | Sllght----Good.
.r,. jli
;l
:n:lr:.:il
'::i
-- .t"1
.;a."., #
t' l'j
'{
' :'.1
I
I
!
T
I
T
I
I
t
I
I
I
Hoderate:
sIope.
Severe:.large stones,
seepage.
Severe:
slope.
Severe:
s1ope,Iarge sEones,
seePage .
Severe:depth to rock.
Severe:
sIope,
depEh to rock.
Severe:
floods.
Severe:
depth to rock,
slope.
Severe:
sIope.
Sevrre:
slope,
seePage.
Severe:
s lope .
Severe:
sIope,
seepage.
Severe:
slope.
Severe:
slope,
see PaSe .
Severe:
slope.
Severe:
slope.
Severe:floods.
Severe:
depth to rock,
slope.
Severe:
slope.
Severe:
sIope.
Severe:
floods.
Sevcre:
sIope.
See footnote at end of table.
v
Septlc lank
lon
SeHage Iagoon
areaS
Trench
sanlEar
Area
san I tar I Dally coverfor landflII
.;11i:l
.:'.:l
-.8
:.,u,!:3
SOIL SURVEv;
' :rj:
'*
-i
Topsotl -:i
118
TABLE 9.--COISIRUCTIOX HATERIALS--Contlnucd
d
#
I
I
I
I
I
I
I
t
t
I
I
I
T
I
I
I
I
I
t
SotI nane and
nap syobol
54, 55-----
Potts
56---------
Potts
57rz
Ildefon so--
58r:Potts------
Ildefon so--
5g r:
Pot ts ---- - -
Ildefonso-- -- - - --- -.-
60---------
R hone
6 1 ---------
Rhone
62r:
Rock outcrop.
Torrlorthents.
65r.
Torr 1 fluvents
66r:Torrlorthents.
CaEborthlds.
Sock outcrop.
6?I:
Torrlorthents.
Rock outcrop.
See footnote ab end
Roadf11l
Falr:Iou strength.
Fair:lon strength.
Falr:Iou strength.
Poor:large sBones.
Falr:
slope,lor strcngth.
Poor:large stones.
Poor:
slope.
Poor:
s1ope,Iarge stones.
Falr:
s lope ,thin Iayer,Iou strength.
Poor:
sIope.
Fair:
Iow strength.
Poor:
s1ope,lor strength,thln layer.
of table.
III
II
Unsul ted
Unsut ted---
[Jnsultgd---
Unsul ted---
Unsulted---
Unsulted---
Unsut ted---
Unsu I ted---
Unsul ted---
Unsuited---
Unsu I ted---
Unsul ted---
ISand I Gravel
II
I
Unsutted---
Unsul ted---
Unsulted---
Unsulted---
Unsulted---
Unsul ted---
Unsulted-------
Unsu I Led---
Unsulted--- :--- -- -- --
Unsui !ed------
Un sutted ---
Un su I ted---
Falr:snaIl
Falr:
sIope,
soa1l
Falr:snaIl
Poor:
large
Poor:
s1ope.
Poor:
s1ope,Iargc
Poor:
sIope.
Poor:
slope,
I arge
Poor:
sIope.
stones.
stoncs.
stones.
stones.
stones.
stones.
Good.
Poor:
sIope,too elayey.
I
I
I
I
HIFLE AREA COLORADO
i Eobankuents, ii dlkes, and !
Dralnage i IrrlEatlon Terraces and
dlverslons
i o"ptt, to rock 'I sloPe.
II
I
II
It
II
I Favorable--
I
I
t
I
I SloPe ,
123
SIope trooLlng depth,
droughtY.
SIope 'rootlng dePth.
i
Erodes easllY.
Pondreservotr
reaS
Depth to rock t
slope,
seepaSe.
SIope 'deplh to rock.
Seepage-----
SeePage tslope.
TABLE 10..-I{ATER HAll AG EHENT--Contl nu ed
r
I
If
So11 name and
trap synbol
53r:
P ar achuLe
54, 55-----
Potts
56----"-'-
PoL!s
57|:Potts----------
I Idefonso-------
Seepage------P lpIng--SloPe------SloPe '
SeepaS,e-------P 1 plng----Slope----------
Sfope '
-;;;a;" easlly. I
tl?3i1" easlrv. itllS::' eastlY'
I
I
I
ti groaes easlly
""6ai" easiry. i
lLarge stones 'Slope,Slope,
Ievees
Thln IaYer-----
Thln laYer----
PiptnS---------
Depth to rock,
sloPe.
SloPe,depth to rock
Slope---------
Slope 'IarBe stones.
Slope 'droughtY ,
Slope 'floods.
SIope,
rootlng,- dePth. i
sloDe. lSroPe'-ioStine dePth. I dePth
I Erodes
to rock
cas 11Y-
droughtY.
Slope t I Large stones t
illil "ton"s, i itoPe'
droughtY.
Slope t
erodes
Erodes
eas1IY.
eas11Y.
Large stones--
Seepage-------P1 ptnS--------Slope--------tt"lBil" easrrv. itl?Ei:" easl1Y'
iilil ston.s, I sroPe'
drarrqhtv. i
laige stonest
drouS,htY.
Slope 'erodes easiIY'
SIcpe tIarge stones,
droughLY.
Slope 'rootinE, dePth '
Favorable.
Slope terodes easllY
rooblng dePth
t
I
I
I
t
I
I
I
I
I
I
56r, 5gr:
Pobt s --------- --
I ldefonso--
50, 61-----
Rhone
62r:
Rock outcroP.
Torr lorihents.
63---------
Silas
64-------'-
Tanna
65r.
Torri fluvents
66r:Torrlorthents.
CaBborthlds.
Rock outcroP.
67rz
Torriorthents.
Rock outcrop.
6 8-------- -
V ale
69 ------ --
Y aIe
Vale
See
Seepage 's1ope.
SIope tdepbh to rock.
SIoPe,
seePage.
SIope ,depth to rock
Large sbones---
Thln 1 ayer----
P i plng----
Thln laYer----
Slope 'Iarge stones.
SloPe 'i depth to rock.
SIope 'floods.
SloPe 'r percs sloulY'
i dePth to rock.
tl33ii". depth.itlSooii to rock
illIS .r.rrv, i-a"'Ptt' bo rock
Ill,ii"i-a"piir. i Pei"s slowrY '
II
I
I
II
I
I
II
II
I
I
I
I
II
II
I
I
II
II
I
I
II
It
Favorable------ I Erodes
I
II
SIope---------- i Erodes- i sloPe'
II
Erodes easilYeasllY
eas11Y t Slope 'erodes
Slope t
erodes
easll
easil
SeePage-----
SIope 'i seePage.
Slope,
seePage.
P I p1 ng- - ------Favorable-----
P 1 pl ng-----Slope-------
sroDe---------- i sloPe '! erodes
It
foolnote at end of table'
Plplng--------SIope---------easiIY.
I
I
I
I
II
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
132
SolI name and
Bap sy6bol
40, 41-----
Klo
42---------
Laophler
rt 3 -- ----- - -
Ltnon
44---------
HorY aI
45r:HorvaI-----
TrldeIl----
q1 -----!t1hir1
q8---------
NorghrraEer
fl9, 50 , 51-----"--
0lneY
52------'-'
Par achute
53r:
P ar achute--
f,h6ng------
I Grasse s
I and
IIFalr i Falr
III
IPoor I Poor
II
II
I Poor I Poor
II
IIFalr lGood
II
II
IIFalr lGood
IIVery lYerY
poor. I Poor.
IFalr lGood
I
I
I
I Poor i Falr
I
IIPoor I Poor
I
IIIPoor I Falr
I
I
IYery iverY
ooor. I Poor.'l
I
I
IPoor I Poor
II
I
IPoor I Poor
herba- | Hard-
! ceous ! woodI and
I seed
uEe Iants I trees
ItFalr i ---
II
It.
Good i ---
I
I
IIFalr t
Good
Good
Poor
Fair
Fair
Good
FaIr
i cooo
t,
Good
Good
Falr
I
I
IIPoor I Poor54, 55 , 56----'-
PoEgs
57r, 5gr:
Po BLs------
Ildefon so--
59r 2
I Ide fonso--
60---------
Rhone
61.---------
Rhone
62r..
Rock outcroP.
TorriorLhents.
See footnote
Poor
Poor
Fair
Falr
I
I
II
II
I Poor
II
I
I
i Poor
!I
I
I
IIPoor I Poor
I
I
IIvery i VerY
Poor. i Poor.I
IPoor I Poor
IIIIVery iVery
Poor. I Poor.II
I
I
I
II
II
I
I
Fatr
Falr
i Good
at end of table.
Good Falr Poor
TABLE 12.--HILDLIFE HABITAT POTENTIALS--Contlnued
i olants I
SOIL SURVEY
OOO-
land
ir
I Hetland I
anEe-
r:1,
. !:.: r'
':,
.,rl":
,,lj
,r*+
,..
land
wild-
land
w1ld-Il fevlId-i rlld- i
11fe lif I Ilfe i
Falr
Falr
Falr
F alr
Poor
Poor
Poor
Very
Poor.
Very
poor.
V erypoor.
Falr
Falr
Poor
Very
POOr.
VerY
poor.
Very
Poor.
Poor
FaIr.
Fatr.
Falr.
Falr.Poor Poor Good
a
| ---
F alr
Falr
Fat r
Fair
Fai r
Poor
Very
POOr.
Very
poor.
i VerY
poor.
Ver y
poor.
Poor
Very
Poor.
Poor
Very
POOr.
Very
Poor.
Very
poor.
Ver y
Poor.
Ver y
POor.
I Very
Good
Poor
Fatr
Poor
Very
poor.
Very
poor.
Very
poor.
Very
poor .
VerYpoor.
Very
POOr.
Ver Y
Poor.
Very
Poor.
Very
Falr.
Falr.
Fatr.
Fair.
Falr.
Falr.
Fair.
Falr.
Good.
Falr.
FaIr.
Fatr.
Fair.
Falr.
Good.
Good.
Fair
Fal r
FaIr
Falr
i Falr
Poor
Falr
Fair
Falr
VerY
poor.
Very
POOr.
Ver y
Poor.
POOr.
V ery
Poor.
Very
poor.
i VerY
Fair
Fair
Poor
Fal r
Fai r
Very
Poor.
VerYpoor.
poor.
Ver y
POOr.
VerYpoor.
Poor
Poor
poor.
VerY
pocir.
Very
POor.
Very
POOr.
Verypoor.
i VerY
Poor.
Verypoor.
Falr
Falr
Falr
Very
Poor.
Very
poor.
Vcry
POor.
Ver y
Poor.
Very
Poor.
Very
POOr.
Very
9oor.
Very
Poor.
Poor
Poor
Falr
i conr r- i shrubs i wetl and I Shar lov i
i-ilir"i- iPlants I Yater I
II
I
39---------Jerry
40, 4 1-----
Klm
42---------
Lamphler
4 3- -- ---- --
Llmon
4ll---------
HorvaI
{5r:
HorvaI-----
TrldelI----
lt6, q7-----
r{lhitl
rlg_______-_
Northuaber
rt9, 50, 51--------
0lney
52--'-'--"
Parachute
53r:Parachute--
Rhone------
\ su, 55, 56--------
Potts
-5?r, 58r, 59r:X Potbs---
' Ildefonso----'---
60, 61-----
Rhone
621 z
None--------
None--------
None--------
None-------- |
I
I
None-------- I
I
I
l.lone-------- I
III
I
None-------- |
II
tlone-------- |
I
None-------- |
I
I
II
None------:- I
I
None-------- |llNone-------- I
c
B
B
c
B
I
B
B
B
B
B
B
B
B
B
B
B
!|
Rock outcroP.
Tor r lorthen bs .
See footnote at end of table.
I
II
I
II,
I
I
I I I I I I I I I r I I r I I I I I I
TABLE 15.--SOIL AND HATER FEATURES--Contlnued ll-lm
>t,m
.B
roaI
Soll name and lHyoro-,mapsymbol r'ioili"i F""qu"noy iDurailoninont,trsioeptt,inonttrs ioepth iHardnessL:[i:: l":i::iolconcrete. . .: ; - |
n
I >6.0
>6.0
>6.0
>6.0
>6.0
,u:
>60
>60
>60
>60
ll
HoderaLe--- I nf gn----- I Hoderate .llllLow-------- I Hl gh----- I Lou.lill
Moderate--- I Htgh----- i Lou.
Low-------- I Hf gh----- I Moderate.llll
Hoderate--- | iloderate I Low.illltl
Moderate--- lHoderate lLow.ll
Hoderabe--- I Hlgh----- I Lor.ll
Hoderate--- I Hlgh----- I Low.llll
Hoderate--- lHoderate lLow.llilLow-------- lHoderabe !Low.llll
Moderate--- lHoderate I Lou.tlllll
Hoderate---lHoderate lLou.ll
Hoderate---lHoderate lLoH.llLou-------- I Hf Sh----- I Hoderate.lillllLou-------- I Hl gh----- I Hoderate.llLow-------- I H18h----- I Low.ll
Moderate--- lModerate lLou.
)6.0
>6.0
>6.0
>6.0
>6.0
>6.0
)6.0
>6.0
>6 .0
>6.o
>6 .0
>6 .0
>60
>60
)60
40-60
>60
20- lt0
20-40
lt0-60
>60
>6o
>60
40-60
Hard
R 1 ppabl e
R 1 ppabl e
R I ppabl e
I
I
Rlppable
I
I
I
I
I
I
I
I
I
I
I
I
I
I
5
J{e6g--------
I
I
I
I
I
I
I
t
t
I
t
I
I
I
I
I
I
I
I
Basin Cof concentration
offsite Tc.txtgasin c offsite Time
2/t6/Os
Sheet rlow
sheet Plow
0.1500
300.0000 ft
1.1000 in
0.0833 ft/ft
computed'Sheet flow t'ime ...> 0.379L hrs
shallow concentrated Flow
shallow Flow
unpaved
1110.0000 ft
0.08ss ft/ft
4.7L78 fps
Descri pti on
l,tanni ng' s n
r'l ow t-enoth
Two Yr , i4 hr nai nfa]] . . .
oescri pti on
su rface
Plow tength
watercourse Slopeve1ocity ...::....-:.... :..
eage 1
I
I
I
I
I
I
I
t
I
I
I
I
I
I
I
I
I
t
T
Basin A Onsite Time
2/L7 /Os
Sheet Flow
gasin e onsite Tc.txtof concentration (exisrting)
?*eo,; od
oescri pt'ion
Manning's nrlow tenoth
Two Yr, i4 hr Rainfall
t-and sl ope .Lqrrs Jlvl,g .
Computed Sheet flow time . . .> 0.4231 hrs
sheet Plow
0. 1_s00
300.0000 ft
1.1000 in
0.0533 ftlft
Shallow concentrated flow
Description Shallow FlowSurface Unpavedrlow length 1273.0000 ft
watercouise slope O.O47t ft/ftvelocity 3.5016 fps
computed sha]low flow time .> 0.1010 hrs
total time of concentration > 0.5241 hrs******************* ** ***** **
Rage 1
I
I
I
I
t
I
I
I
I
I
I
I
I
t
I
I
I
I
I
Basi n B Onsi te T'ime
2/17 /05
sheet r'low
Basin g onsite Tc.txtof concentration (existing)
a^d
fvoposed
Sheet rlow
0. 1s00
300.0000 ft
1.1000 in
0.0533 ft/ft
hrs
shallow concentrated rlow
Shallow Flow
unoaved' 1951-.OOOO ft
0.0677 ft/ft
4.198L fps
Descri Dt'i on
lvtanni nb's n
r'low tenqth
Two Yr , 24 hr Rai nfa]l . . .
t-and s'lope
oescri pti on
su rfacerlow uength .:...
watercourse s lopevelocity .... j j... i:....:
eage 1
I
I
I
I
t
I
I
t
I
I
I
I
I
t
I
t
I
I
T
Basin C Onsite
2/L7 /Os
Sheet rlow
gasin C onsite Tc.txtrime of concentration (exisinr>
Pr"pored
Description sheet rlow
lvtanni ng's n 0. 1500
p'l ow lEnoth 300.0000 ft
Two Yr, i4 hr Rainfall ... 1.1000 in
tand slope 0.0700 ft/ft
computed' sheet flow time ...> 0.4064 hrs
shallow concentrated Plow
oesc_ri pt'ion shal I ow rl ow
unpaved
2663.0000 ft
0.0605 ft/ft
3.9686 fp!
surfacbrlow tength
watercourse Slope
ve] oci ty . .
eage L
^ axd
(('.opos ed)
ili;i;ii
t low t'r
I
t
I
I
I
t
I
I
I
I
I
I
I
I
I
I
t
I
I
Basin D onsite Time
2/L6/0s
sheet rlow
Basi nof concentration
D Onsite TC.txt(rxi sti ng)
oescri pti on
lrtanni ng's n
sheet rlow
0. 1500
300.0000 ft
1.L000 in
0.0933 ft/ftme . . .> 0.3623 hrs
rl ow t-ength
Two Yr, 24 hr
uand s'l ope
Computed Sheet
sha'l'l ow concentrated rl ow
oescri pti onSurface ...
r'l ow tength
Watercourse
ve1 oci ty
Computed
Shallow Flow
unpaved
230s.0000 ftij;il'::.:::::.:.:::'. "uo:fi;s fi/tt
3.9488 fps
>'0.1621 hrs
total rime of concentration > 0.5244 hrs*********** *** *** ******** ***
Rage 1
I
I
I
I
I
I
Basin c offsite Runoff.txt
easin c offiste Runoff
2/27/Os
TR-55 tabular HYdrograPh utethod
Input summary
oescri pti on
OFFSITE BASIN C 1OO-YR FLOW HISTORIC
Rainfall oistribution Type rrlalp tnteroo]ation .... onrota] Area . L8.19 ac
peak time .. L2.4000 hrspeak rlow . . 7.5349 cfs
Given rnput Data:
Subarea
oescri pti on
Area(ac)TC
(h rs)
Tt Rainfall(hrs) (i n)I
I
I
I
I
I
I
I
I
I
I
I
I
BASIN C
support Data:
18.19 0.4445 0.0000 2.8000
Messaqes:info: time of concentration rounded to 0.4000 hrs in row <1>.
eage 1
Basin A Onsite
2/2t/Os
Basin A ons'ite Runoff .txt
Runoff
TR-55 tabular Hydrograph ttethodInput summary
oesc ri pti on
oruslre BASIN A 100-YR FLOW HTSTORTC/PROPOSED
Rai nfal'l oi stri buti on Type rrralp rnteroolation onrotal Area 20.92 ac
peak rime .. L2.5000 hrs
peak rlow .. 7.6849 cfs
Given rnput Data:
Subarea
Descri pti on
Area CN(ac)
TC Tt(hrs) (hrs)nai nfa'l'l(i n)
I
I
I
I
I
I
I
I
I
I
I
T
I
I
I
I
I
I
I
BASIN A
support Data:
20.92 69 0.524L 0.0000 2 .8000
Messaoes:info: time of concentration rounded to 0.5000 hrs in row <1>.
eage 1
hrs
cfs
I
I
I
I
I
I
gasin B onsite Runoff.txtgasin B onsite Runoff
2/21/Os
TR-55 rabular Hydrograph tvtethod
oescription ..1i?::.::TTi:Y.
oNSrrE BASrN B 100-yR FLOW HTSTORTC/PROPOSED
Rai nfal'l oi stri buti on Type rrra/p tnterpolation ontota] Area . 68.11 ac
Peak Time .. L2.6000
Peak rlow 23.6108
Given Input Data:
Subarea
Descri pti on
Area(ac)TC
(h rs)
Tt Rai nfall(hrs) (i n)
ofof
I
I
I
I
I
I
t
I
I
T
I
I
I
BAsrN r6
support Data:
Messaoes:info: rimelnfo: time
68.1L 69 0. 582 0.0000 2. 8000
concentration rounded to 0.5000 hrs in row <1>.Travel rounded to 0.1000 hrs in row <1>.
eage 1
hrs
cfs
I
I
I
I
I
I
gasin C onsite Runoff.txtgasin c onsite Runoff
2/21/Os
TR-55 rabular ttydrograph uethodInput summary
oescri pti on
oNSrrE BASrN C 100-yR FLOW HTSTORTC/PROPOSEDnainfall oistribution Type rrla/P tnterpolation ontotal Area . 61.84 ac
peak rime .. L2.6000peak rlow .. 2L.4372
Given rnput Data:
Subarea
Descri pt'i on
Area(ac)TC
(h rs)
Tt
(h rs)nai nfal l(i n)I
I
I
I
I
I
I
I
t
T
I
I
I
BASIN C
support Data:
Messages:tnfo: timetnfo: time
61. 84
of concentration rounded toof Travel rounded to 0.1000
0. s928 0.0000 2.8000
0.5000 hrs in row <1>.hrs in row <1>.
Rage 1
I
t
I
I
I
I
Basin D Onsite Runoff.txtBasin D onsite Runoff
2/2L/Os
TR-55 rabular Hydrograph tvtethod
Description ..T:?::.::TTTY.
oNSITE BASrN D 100-yR FLOh/ HTSTORIC/PROPOSEDnainfall oistribution Type rrra/e tnterpolation oh'tota] Area . 3L.O7 ac
peak time .. L2.5000 hrs
Peak Plow .. 11.4135 cfs
Given Input Data:
Subarea
Descri pti on
Area(ac)TC
(h rs)Tt
(h rs)nai nfal'l(i n)I
I
I
T
I
I
I
I
I
I
I
I
T
BASrN ^o 31.07 69 0.5244 o.O0oO
support Data:
2.8000
Messaoes:info: rime of concentration rounded to O.5OOO hrs in row <1>.
eage 1
I
I
I
I
I
I
I
I
I
I
I
T
T
I
I
I
I
I
I
time of Concentration of
2/2L/Os
Sheet rlow
Basin C Culverts Tc.txt
Basin C Cu]verts
Descri pti on Sha'l 'low
l,tanni ng's n 0. 1500rlow tength 300.0000 ft
Two Yr, 24 hr Rainfall ... 1-.1000 in
t-and slope ... 0.0833 ft/ft
Computed sheet flow time ...> 0.3791 hrs
Sha'l'low Concentrated f'low
Descri pti on Sha11owSurface Unpavedrlow uength 1645.0000 ftwatercourse slope 0.0638 ft/ftvelocity .. 4.0754 fps
Computed Shallow flow time .> 0.1121 hrs
* * ****** **********rr** ******
* ******* **** ********* *** ** **
eage 1
I
I
I
I
Basin c onsite Runoff to culvert.txtgasin C onsite Runoff to culverts
2/2L/04
TR-55 rabular Hydrograph tuethod
Description ..T:?::.:YTTi:Y.
oNSTTE BASrN C 100-yR FLOW HTSTORTC/PROPOSED TO CULVERTRainfall pistribution Type rrra/e rnterpolation oh.rota] Area' 29.3400
Peak time 12.5000peak rlow .. 10.7779
Given rnput Data:
ac
hrs
cfs
Subarea
Descri pti on
Area(ac)TC
(h rs)
Tt
(h rs)Rai nfal I(i n)
I
I
I
I
I
I
I
I
I
I
I
t
I
I
I
BASrN A 29.3400 69 0.49L2 0.0000
Support Data:
2.8000
Messaoes:info: Time of concentration rounded to O.5OOO hrs in row <1>.
eage 1
t
I
t
I
I
T
T
t
I
I
I
t
I
I
I
I
I
t
I
Basin c cu'lverts
2/2L/os
entered Data:
gasin C Culvert.txt
Culvert Calculator
Chart Description
Scal e oecsri pt'ion
Overtoppi ng
F I owrate
l,tanni ng's n
Roadway elevationtnlet elevation
Scale Number
outl et e'levati on
Shape
uumber of sarrels ...Solving forChart Number
C'i rcul ar
1
Headwater
1
1
CONCRETE PIPE CULVERT
SQUARE EDGE ENTMNCEoff1l.qrco cfs (04]+e. + o^tila
0. 0240
10.0000 ft
6.0000 ft
3.8000 ft
30.0000 in
60.0000 ft
0.0000
2.5000 ft
8.8927 ft rnlet control0.0367 ft/ft
9.2169 fps
wi*\ ,. l'5 b'\L;', (o'1'-)
Di ameter
Length
Entrance
Tai lwater LoSs
Computed Results:
Headwater
S'lopeve'locity ..
Messaoes:inlet head > outlet head.
Comput'ing tnl et Contro'l headwater.solving rnlet Equation 26.
sol v'i ng tnl et Equati on 28 .Headwater: 8.8927 ft
eage 1