HomeMy WebLinkAboutDrainage Plan Sept. 2019DRAINAGE PLAN
FOR
CATTLE CREEK COMMERCIAL CENTER
BUILDINGS "Q" THROUGH "V"
September 2019
Prepared by:
Zancanella & Associates, Inc.
1011 Grand Avenue
Glenwood Springs, CO 81601
(970) 945-5700
ZANCANELLA & ASSOCIATES JOB NUMBER 97004.01
TABLE OF CONTENTS
SECTION PAGE
INTRODUCTION
OFF -SITE BASINS
HYDROLOGY
DRAINAGE PLAN
SUMMARY
APPENDIX A: Calculations
APPENDIX B: Soils and Supplemental Information
DRAWINGS: Project Location Map 8 1/2" x 11"
Drainage Basins Map 11" x 17"
1
1
1
2
3
1
INTRODUCTION
The proposed buildings are located near the intersection of Cattle Creek Road and Highway
82 in Garfield County, Colorado, on an area known as the southwest bench portion of the
existing development. See the Project Location Map at the end of this text.
DRAINAGE BASINS
The only major drainage basin near the site is the Cattle Creek Basin. However, the site is
far above the floodplain level of Cattle Creek. Therefore, the only off -site basins that could
affect this site lie within the steep hills adjacent to the east. These basins are shown on the
Drainage Basin map at the end of this text. All of the off -site basins are quite small, the
largest being only about 3/4 of an acre. Therefore, the related flows affecting the proposed
buildings are also small. The flow and routing calculations are shown in the Appendix.
Even though the off -site basins are small, during larger storm there would be a chance of
some smaller mud/debris flows. Therefore, it is recommended that use be made of an
existing bench that was previously cut for a utility path, but subsequently not used. This
bench could be modified to detain and divert small flows from the basin areas above it. A
cross section detail for this is shown on the (added) sheet 4 of the plans submitted.
The development area itself mainly consists of a bare, dry bench that has previously been
used for storage of construction and trucking related items. The row of trees on the west
side were previously planted to provide screening. There are no defined drainage
channels or ravines on the bench area. The existing drainage basins will remain
unchanged except for minor grading on the bench and adjacent to the proposed buildings.
2
HYDROLOGY
The hydrologic methods for the minor basins in this study are as outlined in the Soil
Conservation Service publication "Procedures for Determining Peak Flows in Colorado".
Peak flows in this area will be primarily rainfall derived since the whole site is well below
8000 feet in elevation. Therefore, the storm drainage system will be more than adequate
to handle spring snowmelt runoff. The precipitation amounts for the 2 and 25 year, 24
hour storms used by the WinTR55 program (Garfield_2 MSE2), were compared with the data
taken from the NOAA Atlas 14, Volume 8, Version 2, "GLENWOOD SPGS #2", on line version,
and found to be essentially the same. The pertinent page is included in the Appendix.
Runoff calculations for the Basins are included in the Appendix.
The hydrologic soil characteristics were obtained from the NRCS Soil Survey for Portions of
Eagle, Garfield and Pitkin Counties. The soil type was consistent and was rated a
Hydrologic Group of "B". The vegetative ground cover is poor and was rated at only 10%
ground cover of the type "Sage/Grass". This results in a general Curve Number of 68 but
70 was used for convenience. The estimated runoff from the 2 and 25 year design storms
prescribed by county code 7-204 C3.a were calculated and the results are shown in the
Appendix. These flows are relatively minor and will be short lived.
DRAINAGE PLAN
The flows generated from the adjacent drainage basins will enter the site on the easterly
side of the bench area. Flows will be directed around the buildings by virtue of a high
point at the center back of each building. [The maximum elevation of the high point was
based on the building structural plans Typical Building Section on Sheet S3.1. This
section shows a maximum fill elevation of 8'-4" above the top of footing or 7'-8" above the
finished floor elevation. For convenience and conservativism, the high point elevations
were limited to 7 feet above the finished floor elevation.] The flows will then directed to
and collected in the central drainage swale in the access/parking area. This swale is
3
directed in two directions from a high point near the northwest corner of Building Q. The
majority will flow northerly to a small settling basin at the north end of the bench, the
remainder will flow southerly to the ditch alongside the access road and thence northerly
along the frontage road to eventually reach Cattle Creek. The general flow patterns are
shown on the Site & Drainage Plan which is sheet 1 of the submitted plans. As previously
noted, the calculations for flows are included in the Appendix.
Note that the proposed buildings are spaced sufficiently to allow storm runoff flows to be
diverted around building sites. It should also be noted that each building is proposed to
have its own roof drainage system that will be added to storm drainage flows at various
points. However, the roof areas were included in the overall calculations and would likely
peak prior to the general site runoff so would not add to the site runoff peak.
SUMMARY
The Drainage Plan for the Cattle Creek Commercial Center Buildings "Q" through "V" project
includes the necessary improvements to mitigate its impact on the drainage patterns of the
area.
LOCATION MAP
N.T.S.
Jae.
ea,
cq. co
co
'.""MMI��',r
a
r
� I j\.\\I
T
► ion me rig
a
r ■00
■ ■/ d
• -. —imolai"'my ing imi
u.
If
* ,pis gimi eYyso
• [!?
44 ■ ■ 1P ,-d
■
a� 4 f .
0
$ 1
cs
cD a
$ .
CO
v- $ o5
C 1 rn
s
1
0121
Ong
1
1
1
1►
111\
1,
.0 1
1
1
1
1
1
1
0.3
DRAINAGE BASINS
SCALE: 1 " = 60'
APPENDIX A:
CALCULATIONS
HYDROLOGY SUMMARY TABLE
I BASIN
AREA
S.F.
AREA
ACRES
Q(2)
*
Q(25)
cfs
Q(25) Routed
cfs
V
28871
0.66
n/a
0.35
U
20137
0.46
n/a
0.24
T
13332
0.31
n/a
0.16
S
19775
0.45
n/a
0.23
R
32024
0.74
n/a
0.39
V-R + Parking
3.45
Detention
Proposed = 1600 cubic feet
Q
4588
0.11
n/a
0.06
P
40140
0.92
n/a
0.48
a-P + Parking
1.07
No Detention Proposed
* amount below initial abstraction
Precipitation Frequency Data Server https://hdsc.nws.noaa.gov/hdsc/pfds/pfds_lrintpage.htrnl?st=co&sta=05...
NOAA Atlas 14, Volume 8, Version 2 GLENWOOD
SPGS #2
Station ID: 05-3359
Location name: Glenwood Springs, Colorado,
USA*
Latitude: 39.5181°, Longitude: -107.3172°
Elevation:
Elevation (station metadata): 5880 ft**
• source: ESRI Maps
"source. USGS
POINT PRECIPITATION FREQUENCY ESTIMATES
Sanja Perica, Deborah Martin, Sandra Pavlovic, Ishani Roy, Michael St. Laurent, Carl Trypaluk, Dale
Unruh, Michael Yekta, Geoffery Bonnin
NOAA National Weather Service, Silver Spring, Maryland
PF_tabular I PF _graphical 1 Maps & aerials
PF tabular
1 PDS-based point precipitation frequency estimates with 90% confidence intervals (in inches)1
[Duration
Average recurrence interval (years)
1 2
5
10 25
50 1 100
200
500
1000
5-min
0.116
(0.092-0.150)
0.170
0.135-0.220)
0.176
(0.139-0.228)
0.268
(0.212-0.348)
0.339 0.430
(0.266.0,443)1(0.320.0,573) i(0.360-0.671)
0.494
0.553
(0.388-0.773) I(0.408-0.878)
0.607
0.670
(0.432.1.00)
0.712
(0.451-1.09)
10-min
15-min
30-min
60-min
0.258
(0.204-0.333)
0.392
(0.310-0.509)(0,390-0.648)
0.497 0.630 0.723
f (9.4684U.838)1(0.527-0-9831
0.809
(0.569-1.13)
0.889
(0.597.1.28)
0.982
(0.633-1.47)
1.04
(0.660.1.60)
(0.165-02 69)(0.249--0
407)
(0.378-0 621)
8
(0.4776-0.791)1(0.5716 ,02)
(0.438220)
7
(0: 948.3a)
1.08
(0.728-1.56)
1.20
(0.772-1.79)
1.42
(0.916-2.12)
1.27
(0,805-1.95)
1.50
(0.950-2.31)
0.285
(0.228.0,369)
0.381
(0,303-0.493)
J 0.411
(0.326.0,532)
0.604
(0.477-0.784)
0.753
(0.591.0.982).
0.940
(0.698-1.25)
1.05
(0.784-1,40)
1.07
(0.780-1,45)
1.19
(0.867-1.61)
1.31
(0.966-1,75)
1.34
(0.998-1,78)
1.19
(0.836-1.66)
1.30
(0.872-1,87}
0.510
(0A04.0.660)
0.707
(0.559.0.918)
0.860
(0.675-1.12)
1.31
(0.923-1.83)
1.43
[03,959-2,06)
1.56
(1.00-2.32)
1.64
(1.04-2,52)
2-hr
0.478
(0.384-0.608)
0.608
(0.488-0.776)
0.810 0.967
(0.648-1.04) (0,769-1.24)
1.17
f (0,881-1.53)
1.44
(1.02-1.98)
1.55
(1.06-2.21)
1.69
(1.11-2.49)
1.73
(1.14-2.53)
1.79
(1.14-2.70)
1.84
F((1.18-2.75)
3-hr
0.560
(0.454-0.707)
0.679
(0.549-0.858)
0.865 1.01
(0.697-1.10) (0.809-1.29)
1.20
(0.917-1.57)
r 1.46
(1.05-2.00)
1.59
(1.09.2.24)
1.78
(1.25-2,50)
2.31
J (1.63-3.19)
6-hr
0.732
(0.600-0.609�)
0.833
(0.682-1.04)
1.00
(0.816-1.25)
1.25
(1.03-1.54)
1.14
(0.923-1.43)
1.33
(1.04-1.73)
1.48
(1.13-1.95)
1.63
(1.19-2.22)
1.99
(1,33-2.88)
2.14
(1.39-3.16)
2.82
1(1,85.4.10)
0.908 -
12-hr
1 (0,754-1.11)
1.04
(0.860-1.27)
1.43 1 1.69
(1.18-1.77) I (1.34-2.16)
1.89
(1.46-2.46)
2.10
(1,56-2.81)
2.67
(2.00.3.52)
2.60
(1.76-3.71)
24-hr
2-day
1.10
{0.924-1.32)
1.26
(1.06-1.52)
1.54
(1.29-1.87)
1.78
(1.48-2.16)
2.11
(1.78.2.52)
2.12
(1.70-2.68)
2.51
(2.04-3.12)
2.39
(1.87-3.07)
2.83
(2,24-3.58)
2.95
(2.11-4.02)
3.35
(2.29-4.70)
3.65
1(2.42-5.21)
1.32
(1.12-1.56)
1.51
(1.28-1.79)
1.83
(1.55-2.17)
3.17
(2.41-4.12)
3.52
(2.55-4.73)
4.01
(2.78-5.55)
4.40
(3.07-6.03)
4.39
(2.95-6.18)
4.81
(3.25-6.69)
3-day
1.47
(1,26-1.72)
1.68
(1.45-1.98)
2.04 2.35
(1,75-2.40) (2.00-2.78)
2.79
(2.29-3.44)
3.14
(2,51-3.93)
3.51
(2.68-4.51)
3.89
(2.83-5.15)
4-day 1.60
- (1.38-1.86)
1.83
(1.58-2,13)
2.21
(1,90-2.59)
2.54
(2.17-2.98)
3.00
(2.47-3.66)
3.37
(2.70-4.18)
3.74
(2,88-4.77)
4.13
(103-5.44)
4.66
(3.28-6,33)
5.07
(3.44-7.01)
7-day 1.92
(1.68-2.21)
2.17
(1,8D-2.49)
2.58
r(2,24.2.97)
2.92 3.41
(2.52-3.38) (2,83.4.09)
3.79
(3.06-4.63)
4.18
(3.24-5.25)
4.58
(3.38-5.94)
5.12
(3.62.5,85)
5.54
(3.79-7.55)
10-day
2.21
(1.94-2.51)
2.46
(2.17-2.80)
2.89
(2.53-3.30)
3.25
(2.83-3.73)
3.75
(3.14-4.46)
4.15
(3.38-5.02)
4.55
(3.56-5.66)
4.97
(3.69-6.38)
5.53
(3.93-7.33)
5.96
(4.10-8,05)
20-day
3.01
(2.69-3.37)
3.33
(2.97-3.73)
3.85
(3.42-4.33)
4.29
(3.79-4.84)
4.89
(4.15-5.71)
5.36
(4.43-6.36)
5.83
(4.62-7.12)
6.31
(4.75-7.95)
6.95
(4.99-9.04)
8.27
(5.98-10.6)
f 7.44
1 (5.18-9.87)
30-day 3.68
(3.32-4.08)
4.08
(3.67-4.62)
4.72
(4.23-5.25)
5.25
(4.67-5.87)
5.97
(5.09-6,87)
6.51
(5:A0•7.63)
7.04
(5.61-8,49)
7.58
(5.74-9.43)
8.79
(6_16-11.5)
45-day
65.30
60-day�
4.55
(4.13-4.98)
5.07
(4.60-5.56)
5.89
(5.32-6.48)
6.54
(5.87-7.23)
7.41
(6.36-8.42)
8.05
(6,73-9.31)
8.67
(6.95-10.3)
9.27
(7.06-11.4)
10.0
(7.28-12,7)
10.6
1 (7.45-13.7)
(4.84.5.78)
5.93
(5.41.8.45)
6.92
(6.29-7.55)
7.70
(6.94-8.44)
8.70
(7.50-9.79)
9.43
(7.92-10.8)
10.1
(8.14-11.9)
10.8
(8.23-13.1)
11.6
(8.42-14.5)
12.1
(8.57-15.6)
1 Precipitation frequency (PF) estimates in this table are based on frequency analysis of partial duration series (PDS).
'Numbers in parenthesis are PF estimates at lower and upper bounds of the 90% confidence interval. The probability that precipitation frequency estimates
(for a given duration and average recurrence interval) will be greater than the upper bound (or less than the lower bound) is 5%. Estimates at upper bounds
are not checked against probable maximum precipitation (PMP) estimates and may be higher than currently valid PMP values.
(Please refer to NOAA Atlas 14 document for more information.
Back to Too
PF graphical
1 of 4 9/9/2019, 2:13 PM
E!==G
90
80
70
60
50
90
80
70
60
50
90
:l :
: ....:1irali: :l ::.Ilmutt �
�: ■a
9nliR�i� ia■ ■.ai1a, Re9..9a&i i ?i
a il... - naaalrnnnaall.aR..1Rt °r1. iiiira
a.illlC:,...1:.'a1• n.a::::.rrII�i11 Myl
I IIICnn,�.1:igaii■....C•14 is■ligg■llum.l■e.■rR■■!
▪ ::h. �1.1■ li....i■
µiilii■.aaRarn.■i LliI 'i.lalaa :aaaC; -,:!e�.::
▪ a .oi•.lUriEi Ei_i?ail
ra"'naRand:in:.iiHii:�il""l.
114■rr.,.`1.a■.TIN. gisaiii.....:aall;lellrnanaRIilaraal
ii"iii:l,liarr•1l.■a..r.l.;i:;:r ial;al■.:RLLi� aaaiiinraiiii1EiMi11:l1I1$:li
lalael!!lnI
II
talNlll■■Peraril■I "■aa:'Ra-.m■x.RR,■.a1■a:aaa aa�:ti:::::aa:aaa;
aama ar:o:rnSr„.iaR■n■..12,4■-alite-■m::■y■llliik um: in
: li ■Eaml C■ile■•ig...r k..I.irrIgh i:R:B.R1:411 ..E
liar':.aisy1
ICCE n i'alala�ll.;.-4r�rill :+,
:■rC atllIr-a.aiiyXif1RiRl kylt rraI.....■ar Rf._r' 1
l t ..r.ariala:niina nn9R■ 4■a�■i
aiiiaaaaaa a 1 o• .°:p::EE.Ei:iiil ' R eIR.._.
Willi." alairal,■rEiiClii9iieii..5.1... • '.: • • .1 1i .,L:.r,..C.- Se
iRra alllla11iill 1. 111111l:r : ii.1: i52
IIIIIIniiiilE`aa1 IIIEEEEE: iMIiliaaa-••.aia a'"r'
limb; a.u..1i.. Rl:iii.a ilip eiiiiiii�i as .alga:-.....a■¢.■yii a
..x:r.a ail
`••all :gEi:: RC:i"Eil : ll; lal II 1 arMal."•. OM:Irrr■aiiii.i
pH
a :n'a"aa a1rl.
■■■IrI■lo.......... ia'mniroinu:ill.■■.■.r...imina.lien■a aiili:i'
'r ■" plus.. as I aranla.i
■ ..a 11.1ffl
SiRyar�.M1i.RR.afy a a l�nia as
rrn�.l■: IlalRlR'r:.. ;a , . Mai■■g1.■■oariilll I a nor
x:'? iialilalEaRRRr :,1..■.,. •.a.• "'.�.rr l Al1:1aal.......l Raip2 °r'rai
` ,.■N.fw-...C1-iii llll..aala:;l:II
`3 •'a.Raan•
I... ••;i
80
70
60
50
:I::II:ICI■kaaxi
■R.. -
1RI1.I1= i ih. 9y E 1111 Ra
..R■■.a.r xrR
Ei aCq i .i fir.
■nrarlii■. 1w. n
■',■/rR....a.a M■.lY:r ..■laa Illli�'I"�.Call'lil
:,��a...RR■,aa.iEi1i:ai.arlal'aaaaii11:i`. R■
I .a...lI.l.:1I . .,'■.�1 as aaa7iailrp"}ial^ ria la:.iC �pl
• ■1.ir!■ I .� rr■■ra1Jla it
R ■a. r■■ / • a a hum "I" rr a .i i.i.a
ICI :Cllilni a.l•..a.l1CC:r.,.■..0 l
a■.l..Raar1■naia:lclnnallariala.l rr.■r■■■a.rr-,R.R ...... I; n
a. a'nn. . r raalfilllaall IlxriCnaaaaa.Er11■I.allRia:aiRl="-a*anaERaa� rRa.rRR
.I.iRllkrin.ar a.n.a.lrarra�i■IIIR.RI.a.. &.rrn '�ey.lii
le :dun*
a:aa ■■■■■■■■ar.■araa■riaaaaaieea.lr•:.::aiaa, ....
n17■7■iiii I ilriliaiiiiiaiiii' Ri■I . iliii■■riiii iaf■■IIIRIa.RR. 1aR .Rao
. I■a.a.a a • ' i ■ .. safely■ I!i aa■ a {��ri •R'a
t'■■ir:a ■.RRilla II •l■oar u na i I`w aiaiiia RRni:
l ar..r
IaxR r■R1 RRRR/ ..+ .a RRR1
r■ ■ ' :::al:aaei.a1aa■giiii a -a i iliaa'r" linnnnn
M lall■l■a r ■a ■ k 1■ 1 OHM RS■ * y
;r aMrli.a�■iiRiary•■111I..YaI■■■■ is rr.. iiEirllllariaRl ERa R Ra
Y.rra.:r1 I .■■I a C■■r . ■. . CC■■a 2l ll !EOM
■..• a.a1a1■.rrr`n1.a Rf■.n..■ki■■r.i....Ilr■ali.MYRa■IZ M
I" •`:•.1•7•P l�al laaailm.a.l+2::: Illligalanngrillige..1a. a■ iaaEEl
■ t-imianali:aa�uldp::::::coat.:ir.■n...::::l::alliaala:aCya■■r■■r.{RlCili■iii.
mutt■r■.r `'1., la:: N.... .. ■ n, aliili■ iE��� N ii
:a N'.1 ..R.1.. .Y1. rr si,arYa�li`ra.aaa'aaa
Y�lr i1? '�rfir �::::: - _ .�R aaa l�lal�a a
+�rinlil r..•CaNil•. r. .... .r .R%n-1�1 a :Ca 1■RY cr
.■ir=■ f■.R .. ■aaal�sr.lx ■ .1I' 1.rr■n:::.::aa1r- —"inv.' Ini iainlal __rear
Mier aEaltliiilirliyR�;,Vtirlaiaie1llwkr{►11441 �i iiklTra
l l ra a.� rrl■■ •fl+j ��,, a i rail,. •.allaa1 11
will •• `RI■ "'all ll. la`Ilr ��� Irillia ray 1lR - r
.r....1: RRn.aa'iaa=i:an. Ri ... �. rr R....nnnn:ra.: r r ..ilai`••• r
� I a.nai.a.a :mar
.■ai.in..l rli.E"an.ir Igi a■■ .' Rlaala iaiia ail.. irElg ilia ��cii"iliil"a a ii
r. . rare RR R ■■■■ ■■■■■.��� ■■ `E ■y a or,■.
Ian r r IIR-nut f1�R Rrrra.:trnaaan ■■I .■ 'll aaaial
n a.. a a III iar iilai... gn
?iEiiaa:alriii.a..,3° li' hl'ilR.,d aaa.:IiiktiiC{iiiiiiiiiiii iiiiiiiii�;:
.a. �...1aar I`r ►�r1 a.r.rr.■a ■...Eii:■■::
■ ..a. r...1■:.:gag ailallillilrtiar::i'..arr,rerllr:aiaaaa:laln:aanag5ga
i" I i; as 1 " 1a1. ■■ a.■ •R.1 ■.oar.:M.ar'f.•a iiiil.Yal..i R
I.. aaEn'.11 ll.nnaan1 1 1■Rant•: as■■... `�r; 1YYY.1Yfaa■a■al
111111::asi1111iiiiiii�l'a.iIliumEiiiliEnill91 iiiliiii-EiialiiEa.'ii: aY ililiR ..
R
1f 11 C ara.a ■a11111C;111:1r..■rRRr1.■alra lalaar ll " :1a
lrlail■ li ra�Yl rll. ■■ r w.. . mum: ra1 aRll.r.ai. ia.1R
n a Cr1.r krIiiil.■Claninnnnnnnaaa i laikhaninr hiiiilaExlllliii-
:::lei': TT; Wm:1:ap°:E..a:rRaieC.7air::7iI: alliamet :aa.11;"--- .RR :iv" 1.4
0 20 40 60
Figure S— 3 Ground Cover Density - percent
HYDROLOGIC SOIL COVER COMPLEX a ASSOCIATED CURVE NUMBERS
D
C Herbaceous
D
C Oakaspen
B
Juniper- grass
C
Sage — grass
80
23
WinTR-55 Current Data Description
--- Identification Data ---
User: tpb Date: 9/16/2019
Project: CCC - SW Bench Units: English
SubTitle: Areal Units: Acres
State: Colorado
County: Garfield_2 MSE3
Filename: Z:\97000's\97404 Rudd, Wayne\97404.01 Cattle Creek\2019\SW Bldg Plans\drainage\ex basins V-R-w pkg.w55
Name
- -- Sub -Area Data ---
Description Reach Area(ac) RCN Tc
✓ Outlet 0.67 70 0.100
U V 0.46 70 0.100
T U 0.31 70 0.100
S T 0.45 70 0.100
R S 0.75 70 0.100
parking Outlet 0.98 88 0.100
Total area: 3.62 (ac)
- -- Storm Data --
Rainfall Depth by Rainfall Return Period
2-Yr 5-Yr 10-Yr 25-Yr 50-Yr 100-Yr 1-Yr
(in) (in) (in) (in) (in) (in) (in)
1.29
1.56 1.8
2.15 2.43
2.73 1.13
Storm Data Source: Garfield_2 MSE2 County, CO (NRCS)
Rainfall Distribution Type: Type MSE2
Dimensionless Unit Hydrograph: <standard>
WinTR-55, Version 1.00.10
Page 1 9/16/2019 1:17:44 PM
tpb
CCC - SW Bench
Garfield 2 MSE3 County, Colorado
Storm Data
Rainfall Depth by Rainfall Return Period
2-Yr 5-Yr 10-Yr 25-Yr 50-Yr 100-Yr 1-Yr
(in) (in) (in) (in) (in) (in) (in)
1.29
1.56 1.8
2.15 2.43
2.73 1.13
Storm Data Source: Garfield_2 MSE2 County, CO (NRCS)
Rainfall Distribution Type: Type MSE2
Dimensionless Unit Hydrograph: <standard>
WinTR-55, Version 1.00.10 Page 1 9/16/2019 1:17:44 PM
tpb
CCC - SW Bench
Garfield_2 MSE3 County, Colorado
Watershed Peak Table
Sub -Area Peak Flow by Rainfall Return Period
or Reach 2-Yr 25-Yr
Identifier (cfs) (cfs)
SUBAREAS
✓ .00 0.35
U .00 0.24
T .00 0.16
S .00 0.23
R .00 0.39
parking 0.92 2.30
REACHES
✓ .00 0.99
Down .00 0.99
U .00 0.77
Down .00 0.77
T .00 0.62
Down .00 0.62
S .00 0.39
Down .00 0.39
OUTLET 0.92 3.45
WinTR-55, Version 1.00.10
Page 1 9/16/2019 1:17:44 PM
tpb
CCC - SW Bench
Garfield 2 MSE3 County, Colorado
Hydrograph Peak/Peak Time Table
Sub -Area Peak Flow and Peak Time (hr) by Rainfall Return Period
or Reach 2-Yr 25-Yr
Identifier (cfs) (cfs)
(hr) (hr)
SUBAREAS
✓ .00 0.35
n/a 12.14
U .00 0.24
n/a 12.14
T -00 0.16
n/a 12.14
S .00 0.23
n/a 12.14
R .00 0.39
n/a 12.14
parking 0.92 2.30
12.13 12.12
REACHES
✓ .00 0.99
n/a 12.16
Down .00 0.99
n/a 12.16
U
T
S
Down
Down
Down
. 00 0.77
n/a 12.14
.00 0.77
n/a 12.16
. 00 0.62
n/a 12.14
.00 0.62
n/a 12.14
.00 0.39
n/a 12.14
.00 0.39
WinTR-55, Version 1.00.10 Page 1
9/16/2019 1:17:44 PM
tpb
CCC - SW Bench
Garfield_2 MSE3 County, Colorado
Hydrograph Peak/Peak Time Table (continued)
Sub -Area Peak Flow and Peak Time (hr) by Rainfall Return Period
or Reach 2-Yr 25-Yr
Identifier (cfs) (cfs)
(hr) (hr)
OUTLET
n/a 12.14
0.92 3.45
WinTR-55, Version 1.00.10 Page 2
9/16/2019 1:17:44 PM
tpb
CCC - SW Bench
Garfield 2 MSE3 County, Colorado
Sub -Area Summary Table
Sub -Area Drainage Time of Curve Receiving Sub -Area
Identifier Area Concentration Number Reach Description
(ac) (hr)
✓ :67 0.100 70 Outlet
U .46 0.100 70 V
T .31 0.100 70 U
S .45 0.100 70 T
R .75 0.100 70 S
parking .98 0.100 88 Outlet
Total Area: 3.62 (ac)
WinTR-55, Version 1.00.10 Page 1 9/16/2019 1:17:44 PM
tpb
CCC - SW Bench
Garfield_2 MSE3 County, Colorado
Reach Summary Table
Receiving Reach Routing
Reach Reach Length Method
Identifier Identifier (ft)
✓ Outlet 70 CHANNEL
U V 116 CHANNEL
T U 90 CHANNEL
S T 110 CHANNEL
WinTR-55, Version 1.00.10 Page 1 9/16/2019 1:17:44 PM
tpb
CCC - SW Bench
Garfield_2 MSE3 County, Colorado
Sub -Area Time of Concentration Details
Sub -Area Flow Mannings's End Wetted Travel
Identifier/ Length Slope n Area Perimeter Velocity Time
(ft) (ft/ft) (sq ft) (ft) (ft/sec) (hr)
V
User -provided
U
User -provided
T
User -provided
S
User -provided
R
User -provided
0.100
Time of Concentration 0.100
0.100
Time of Concentration 0.100
0.100
Time of Concentration 0.100
0.100
Time of Concentration 0.100
0.100
Time of Concentration 0.100
parking
User -provided 0.100
Time of Concentration 0.100
WinTR-55, Version 1.00.10 Page 1 9/16/2019 1:17:44 PM
tpb
Sub -Area
Identifier
CCC - SW Bench
Garfield_2 MSE3 County, Colorado
Sub -Area Land Use and Curve Number Details
Land Use
Hydrologic Sub -Area Curve
Soil Area Number
Group (ac)
✓ CN directly entered by user .67 70
Total Area / Weighted Curve Number
67 70
U CN directly entered by user - .46 70
Total Area / Weighted Curve Number
.46
70
T CN directly entered by user - .31 70
Total Area / Weighted Curve Number
.31 70
S CN directly entered by user - .45 70
Total Area / Weighted Curve Number
.45 70
R CN directly entered by user - .75 70
Total Area / Weighted Curve Number
parking CN directly entered by user
Total Area / Weighted Curve Number
.75 70
.98 88
.98 88
WinTR-55, Version 1.00.10 Page 1 9/16/2019 1:17:44 PM
tpb
CCC - SW Bench
Garfield_2 MSE3 County, Colorado
Reach Channel Rating Details
Reach Reach Reach Friction Bottom Side
Identifier Length Manning's Slope Width Slope
(ft) n (ft/ft) (ft)
✓ 70 0.035 0.01 1 4 :1
U 116 0.035 0.01 1 4 :1
T 90 0.035 0.025 1 4 :1
S 110 0.035 0.025 1 4 :1
Reach End Top Friction
Identifier Stage Flow Area Width Slope
(ft) (cfs) (sq ft) (ft) (ft/ft)
V
T
S
0.0 0.000 0 1 0.01
0.5 2.808 1.5 5
1.0 14.090 5 9
2.0 77.894 18 17
5.0 818.173 105 41
10.0 5030.343 410 81
20.0 31419.740 1620 161
0.0 0.000 0 1 0.01
0.5 2.808 1.5 5
1.0 14.090 5 9
2.0 77.894 18 17
5.0 818.173 105 41
10.0 5030.343 410 81
20.0 31419.740 1620 161
0.0 0.000 0 1 0.025
0.5 4.440 1.5 5
1.0 22.279 5 9
2.0 123.162 18 17
5.0 1293.645 105 41
10.0 7953.671 410 81
20.0 49678.971 1620 161
0.0 0.000 0 1 0.025
0.5 4.440 1.5 5
1.0 22.279 5 9
2.0 123.162 18 17
5.0 1293.645 105 41
WinTR-55, Version 1.00.10
Page 1 9/16/2019 1:17:44 PM
WinTR-55 Current Data Description
--- Identification Data ---
User: tpb Date: 9/16/2019
Project: CCC - SW Bench Units: English
SubTitle: Areal Units: Acres
State: Colorado
County: Garfield_2 MSE3
Filename: Z:\97000's\97404 Rudd, Wayne\97404.01 Cattle Creek\2019\SW Bldg Plans\drainage\ex basins Q-P-w pkg.w55
--- Sub -Area Data ---
Name Description Reach Area(ac) RCN Tc
Q Outlet 0.11 70 0.100
P Outlet 0.92 70 0.100
parking Outlet 0.23 88 0.100
Total area: 1.26 (ac)
--- Storm Data --
Rainfall Depth by Rainfall Return Period
2-Yr 5-Yr 10-Yr 25-Yr 50-Yr 100-Yr 1-Yr
(in) (in) (in) (in) (in) (in) (in)
1.29
1.56 1.8
2.15 2.43
2.73 1.13
Storm Data Source: Garfield2 MSE2 County, CO (NRCS)
Rainfall Distribution Type: Type MSE2
Dimensionless Unit Hydrograph: <standard>
WinTR-55, Version 1.00.10 Page 1
9/16/2019 1:16:30 PM
tpb
CCC - SW Bench
Garfield 2 MSE3 County, Colorado
Storm Data
Rainfall Depth by Rainfall Return Period
2-Yr 5-Yr 10-Yr 25-Yr 50-Yr 100-Yr 1-Yr
(in) (in) (in) (in) (in) (in) (in)
1.29
1.56 1.8
2.15 2.43
2.73 1.13
Storm Data Source: Garfield_2 MSE2 County, CO (MRCS)
Rainfall Distribution Type: Type MSE2
Dimensionless Unit Hydrograph: <standard>
WinTR-55, Version 1.00.10 Page 1 9/16/2019 1:16:30 PM
tpb
CCC - SW Bench
Garfield 2 MSE3 County, Colorado
Watershed Peak Table
Sub -Area Peak Flow by Rainfall Return Period
or Reach 2-Yr 25-Yr
Identifier (cfs) (cfs)
SUBAREAS
Q .00 0.06
P .00 0.48
parking 0.22 0.54
REACHES
OUTLET
0.22 1.07
WinTR-55, Version 1.00.10
Page 1 9/16/2019 1:16:30 PM
tpb
CCC - SW Bench
Garfield 2 MSE3 County, Colorado
Hydrograph Peak/Peak Time Table
Sub -Area Peak Flow and Peak Time (hr) by Rainfall Return Period
or Reach 2-Yr 25-Yr
Identifier (cfs) (cfs)
(hr) (hr)
SUBAREAS
Q .00 0.06
n/a 12.14
P
.00 0.48
n/a 12.14
parking 0.22 0.54
12.13 12.12
REACHES
OUTLET 0.22 1.07
WinTR-55, Version 1.00.10 Page 1
9/16/2019 1:16:30 PM
tpb
CCC - SW Bench
Garfield_2 MSE3 County, Colorado
Sub -Area Summary Table
Sub -Area Drainage Time of Curve Receiving Sub -Area
Identifier Area Concentration Number Reach Description
(ac) (hr)
Q .11 0.100 70 Outlet
P .92 0.100 70 Outlet
parking .23 0.100 88 Outlet
Total Area: 1.26 (ac)
WinTR-55, Version 1.00.10
Page 1 9/16/2019 1:16:30 PM
tpb
CCC - SW Bench
Garfield 2 MSE3 County, Colorado
Sub -Area Time of Concentration Details
Sub -Area Flow Mannings's End Wetted Travel
Identifier/ Length Slope n Area Perimeter Velocity Time
(ft) (ft/ft) (sq ft) (ft) (ft/sec) (hr)
4
User -provided
P
User -provided
parking
User -provided
0.100
Time of Concentration 0.100
0.100
Time of Concentration 0.100
Time of Concentration
0.100
0.100
WinTR-55, Version 1.00.10 Page 1 9/16/2019 1:16:30 PM
tpb
CCC - SW Bench
Garfield 2 MSE3 County, Colorado
Sub -Area Land Use and Curve Number Details
Sub -Area Hydrologic Sub -Area Curve
Identifier Land Use Soil Area Number
Group (ac)
Q CN directly entered by user - .11 70
Total Area / Weighted Curve Number .11 70
P CN directly entered by user .92 70
Total Area / Weighted Curve Number .92 70
parking CN directly entered by user - .23 88
Total Area / Weighted Curve Number .23 88
WinTR-55, Version 1.00.10
Page 1 9/16/2019 1:16:30 PM
CCC SW Bench - Basins V through R
Q(25) to 4(100)
Determination of MAJOR Detention Volume Using Modified FAA Method
Design Information (Input):
Catchment Drainage Imperviousness
Catchment Drainage Area
Predevelopment NRCS Soil Group
Return Period for Detention Control
Time of Concentration of Watershed
Allowable Unit Release Rate
One -hour Precipitation
Design Rainfall IDF Formula i = C1* P1/(C2+TJ^C3
Coefficient One
Coefficient Two
Coefficient Three
la =
A=
Type =
T=
Tc =
q=
P� =
C1 =
C2 =
C3 =
10.00
3.620
B
25
8
0.41
1.05
28.50
10
0.789
percent
acres
A, B, C, or D
years (2, 5, 10, 25, 50, or 100)
minutes
cfs/acre
inches
Determination of Average Outflow from the Basin (Calculated):
Runoff Coefficient
Inflow Peak Runoff
Allowable Peak Outflow Rate
C
Qp-in =
Qp-out =
Mod. FAA Major Storage Volume =
Mod. FAA Major Storage Volume =
0.31
3.43 cfs
cfs
cubic feet
acre-ft
1.48
1,599
0.037
Rainfall
Duration
minutes
(input)
Rainfall
Intensity
inches / hr
(output)
Inflow
Volume
cubic feet
(output)
Adjustment
Factor
(output)
Average
Outflow
cfs
(output)
Outflow
Volume
cubic feet
(output)
Storage
Volume
cubic feet
(output)
0
2
4
6
8
10
12
14
16
18
20
22
24
26
28
30
32
34
36
0.00
4.21
3.73
3.36
3.06
2.82
2.61
2.44
2.29
2.16
2.04
1.94
1.85
1.77
1.70
1.63
1.57
1.51
1.46
0
567
1,005
1,356
1,648
1,896
2,110
2,298
2,466
2,616
2,753
2,878
2,993
3,100
3,199
3.291
3.378
3,460
3.537
0.00
1.00
1.00
1.00
1.00
0.90
0.83
0.79
0.75
0.72
0.70
0.68
0.67
0.65
0.64
0.63
0.63
0.62
0.61
0.00
1.48
1.48
1.48
1.48
1.34
1.24
1.17
1.11
1.07
1.04
1.01
0.99
0.97
0.95
0.94
0.93
0.92
0.91
0
178
356
534
712
801
891
980
1,069
1,158
1,247
1,336
1,425
1,514
1,603
1,692
1,781
1,870
1,959
0
389
648
822
936
1,094
1,219
1,319
1,397
1,459
,506
,542
,568
,586
,596
,599
,597
,590
,578
UD_Detention_2.2.xls, Modified FAA 9/16/2019, 2:18 PM
38
40
42
44
46
48
50
52
54
56
58
60
62
64
66
68
70
72
74
76
78
80
82
84
86
88
90
92
94
96
98
100
102
104
106
108
110
112
114
116
118
120
1.41 3,610
1.37 3,680
1.32 3,746
1.29 3,809
1.25 _ 3,870
1.22 3,928
1.18 3,983
1.15 4,037
1.12 4,089
1.10 4,138
1.07 4,186
1.05 4,233
1.02 4,278
1.00 4,321
0.98 4,364
0.96 _ 4,405
0.94 1 4,444
0.92 I 4,483
0.91 4,521
0.89 4,558
0.87 _ 4,594
0.86 4,629
0.84 4,663
0.83 4,696
0.82 4,729
0.80 4,761
0.79 4,792
0.78 4,822
0.77 4,852
0.76 4,882
0.74 4,910
0.73 4,939
0.72 4,966
0.71 4,993
0.70 5,020
0.69 5,046
0.68 5,072
0.68 5,097
0.67 5,122
0.66 5,147
0.65 5,171
0.64 5,194
0.61
0.60
0.60
0.59
0.59
0.58
0.58
0.58
0.57
0.57
0.57
0.57
0.56
0.56
0.56
0.56
0.56
0.56
0.55
0.55
0.55
0.55
0.55
0.55
0.55
0.55
0.54
0.54
0.54
0.54
0.54
0.54
0.54
0.54
0.54
0.54
0.54
0.54
0.54
0.53
0.53
0.53
0.90
0.89
0.88
0.88
0.87
0.87
0.86
0.86
0.85
0.85
0.84
0.84
0.84
0.83
0.83
0.83
0.83
0.82
0.82
0.82
0.82
0.82
0.81
0.81
0.81
0.81
0.81
0.81
0.81
0.80
0.80
0.80
0.80
0.80
0.80
0.80
0.80
0.80
0.79
0.79
0.79
0.79
2,048
2,137
2,226
2,315
2,404
2,493
2,583
2,672
2,761
2,850
2,939
3,028
3,117
3,206
3,295
3,384
3,473
3,562
3,651
3,740
3,829
3,918
4,007
4,096
4,185
4,274
4,364
4,453
4,542
4,631
4,720
4,809
4,898
4,987
5,076
5,165
5,254
5,343
5,432
5,521
5,610
5, 699
1,562
1,543
1,520
1,494
1,465
1,434
1,401
1,365
1,328
1,289
1,248
1,205
1,161
1,115
1,069
1,021
971
921
870
818
764
710
655
600
543
486
428
370
311
251
191
130
68
6
-56
-119
-182
- 246
-310
- 375
-440
-505
Mod. FAA Major Storage Volume (cubic ft.) = 1,599
Mod. FAA Major Storage Volume (acre-ft.) = 0.0367
UD_Detention_2.2.xls, Modified FAA 9/16/2019, 2:18 PM
APPENDIX B:
SOILS AND SUPPLEMENTAL INFORMATION
3
V
3
ti
°1.
Soil Map —Aspen -Gypsum Area, Colorado, Parts of Eagle, Garfield, and Pitkin Counties
Map Scale: 1:3,670 if printed on A portrait (8.5" x 11") sheet
rMeters
0 50 100 200 300
Feet
0 150 300 600 900
Map projection: Web Mercator Comer coordinates: WGS84 Edge tics: UTM Zone 13N WGS84
3
39° 27 20" N
39° 26' 55" N
i!51)‘ Natural Resources Web Soil Survey
oam Conservation Service National Cooperative Soil Survey
9/4/2019
Page 1 of 3
Soil Map —Aspen -Gypsum Area, Colorado, Parts of Eagle, Garfield, and Pitkin Counties
Area of Interest (AO1)
Soils
MAP LEGEND
Area of Interest (AOI)
Soil Map Unit Polygons
Soil Map Unit Lines
Soil Map Unit Points
Special Point Features
w
Blowout
Borrow Pit
Clay Spot
Closed Depression
Gravel Pit
Gravelly Spot
Landfill
Lava Flow
Marsh or swamp
Mine or Quarry
Miscellaneous Water
Perennial Water
Rock Outcrop
Saline Spot
Sandy Spot
Severely Eroded Spot
Sinkhole
Slide or Slip
Sodic Spot
4.
gt Spoil Area
Stony Spot
Very Stony Spot
Wet Spot
Other
Special Line Features
Water Features
Streams and Canals
Transportation
} E{ Rails
Interstate Highways
US Routes
Major Roads
Local Roads
Background
Aerial Photography
MAP INFORMATION
The soil surveys that comprise your AOI were mapped at
1:24,000.
Warning: Soil Map may not be valid at this scale.
Enlargement of maps beyond the scale of mapping can cause
misunderstanding of the detail of mapping and accuracy of soil
line placement. The maps do not show the small areas of
contrasting soils that could have been shown at a more detailed
scale.
Please rely on the bar scale on each map sheet for map
measurements.
Source of Map: Natural Resources Conservation Service
Web Soil Survey URL:
Coordinate System: Web Mercator (EPSG:3857)
Maps from the Web Soil Survey are based on the Web Mercator
projection, which preserves direction and shape but distorts
distance and area. A projection that preserves area, such as the
Albers equal-area conic projection, should be used if more
accurate calculations of distance or area are required.
This product is generated from the USDA-NRCS certified data as
of the version date(s) listed below.
Soil Survey Area: Aspen -Gypsum Area, Colorado, Parts of
Eagle, Garfield, and Pitkin Counties
Survey Area Data: Version 9, Sep 10, 2018
Soil map units are labeled (as space allows) for map scales
1:50,000 or larger.
Date(s) aerial images were photographed: Sep 24, 2015—Nov
2, 2015
The orthophoto or other base map on which the soil lines were
compiled and digitized probably differs from the background
imagery displayed on these maps. As a result, some minor
shifting of map unit boundaries may be evident.
USDA Natural Resources
Conservation Service
Web Soil Survey
National Cooperative Soil Survey
9/4/2019
Page 2 of 3
Soil Map —Aspen -Gypsum Area, Colorado, Parts of Eagle, Garfield, and Pitkin Counties
Map Unit Legend
Map Unit Symbol
Map Unit Name
Acres In AOI
Percent of AOI
13
Atencio-Azeltine complex, 3 to
7.6
18.3%
6 percent slopes
55
Gypsum land-Gypsiorthids
complex, 12 to 65 percent
slopes
24.2
58.3%
94
Showalter-Morval complex, 5
to 15 percent slopes
4.1
10.0%
96
Southace cobbly sandy loam,
1 to 6 percent slopes
1.5
3.6%
98
Southace cobbly sandy loam,
12 to 25 percent slopes
4.1
9.8%
Totals for Area of Interest
41.5
100.0%
USDA Natural Resources Web Soil Survey 9/4/2019
is Conservation Service National Cooperative Soil Survey Page 3 of 3
Map Unit Description: Gypsum land-Gypsiorthids complex, 12 to 65 percent slopes---Aspen-
Gypsum Area, Colorado, Parts of Eagle, Garfield, and Pitkin Counties
Aspen -Gypsum Area, Colorado, Parts of Eagle,
Garfield, and Pitkin Counties
55—Gypsum land-Gypsiorthids complex, 12 to 65 percent
slopes
Map Unit Setting
National map unit symbol: jq6f
Mean annual precipitation: 10 to 15 inches
Mean annual air temperature: 39 to 46 degrees F
Frost -free period: 80 to 105 days
Farmland classification: Not prime farmland
Map Unit Composition
Gypsum land: 65 percent
Gypsiorthids and similar soils: 20 percent
Minor components: 15 percent
Estimates are based on observations, descriptions, and transects of
the mapunit.
Description of Gypsum Land
Typical profile
H1 - 0 to 60 inches: gypsiferous material
Properties and qualities
Slope: 12 to 65 percent
Depth to restrictive feature: 0 inches to paralithic bedrock
Runoff class: Very high
Capacity of the most limiting layer to transmit water (Ksat): Very
low (0.00 to 0.00 in/hr)
Salinity, maximum in profile: Moderately saline to strongly saline
(8.0 to 32.0 mmhos/cm)
Available water storage in profile: Very low (about 0.0 inches)
Interpretive groups
Land capability classification (irrigated): None specified
Land capability classification (nonirrigated): 8s
Hydric soil rating: No
Description of Gypsiorthids
Setting
Landform: Mountains, drainageways, hills
Landform position (two-dimensional): Shoulder
Landform position (three-dimensional): Mountainflank, side slope
Down -slope shape: Linear
Across -slope shape: Linear
Parent material: Mixed colluvium and/or mixed residuum
Typical profile
H1 - 0 to 8 inches: fine sandy loam
USDA Natural Resources Web Soil Survey
0+. Conservation Service National Cooperative Soil Survey
9/4/2019
Page 1 of 2
Map Unit Description: Gypsum land-Gypsiorthids complex, 12 to 65 percent slopes---Aspen-
Gypsum Area, Colorado, Parts of Eagle, Garfield, and Pitkin Counties
H2 - 8 to 23 inches: fine sandy loam
H3 - 23 to 39 inches: fine sandy loam
H4 - 39 to 43 inches: weathered bedrock
Properties and qualities
Slope: 12 to 50 percent
Depth to restrictive feature: 10 to 40 inches to paralithic bedrock
Natural drainage class: Well drained
Runoff class: Medium
Capacity of the most limiting layer to transmit water (Ksat):
Moderately low to high (0.06 to 2.00 in/hr)
Depth to water table: More than 80 inches
Frequency of flooding: None
Frequency of ponding: None
Calcium carbonate, maximum in profile: 10 percent
Gypsum, maximum in profile: 12 percent
Salinity, maximum in profile: Slightly saline to moderately saline
(4.0 to 8.0 mmhos/cm)
Available water storage in profile: Low (about 5.5 inches)
Interpretive groups
Land capability classification (irrigated): None specified
Land capability classification (nonirrigated): 8s
Hydrologic Soil Group: B
Hydric soil rating: No
Minor Components
Other soils
Percent of map unit: 15 percent
Hydric soil rating: No
Data Source Information
Soil Survey Area: Aspen -Gypsum Area, Colorado, Parts of Eagle, Garfield, and
Pitkin Counties
Survey Area Data: Version 9, Sep 10, 2018
USDA Natural Resources Web Soil Survey 9/4/2019
Conservation Service National Cooperative Soil Survey Page 2 of 2