HomeMy WebLinkAbout4.0 Extension of Water to Rifle Airport - Water Rights InvestigationRIFLE LAND ASSOCIATES
CONCER'N'ED WITH TH
GARFIELD COUNTY AIRPORT
PLANNED -UNI.T DEVELOPMENT
RIFLE LAND ASSOCIATES
WATER RIGHTS INVESTIGATION
CONCERNED WITH THE
GARFIELD COUNTY AIRPORT PLANNED UNIT DEVELOPMENT
TIPTON AND KALMBACH, INC. - ENGINEERS
DENVER, COLORADO
JULY 1983
TABLE OF CONTENTS
Page
INTRODUCTION
GARFIELD COUNTY AIRPORT PLANNED UNIT DEVEL&PMENT
WATER DEMANDS AND DEPLETIONS 2
RIFLE LAND ASSOCIATES WATER RIGHTS 3
L&C Ditch 4
Enterprise Ditch 4
Last Chance Ditch 4
Rainbow Ditch 5
Crann Pipeline 5
Vaughn Reservoir 6
HISTORIC CONSUMPTIVE USE 6
PLAN FOR AUGMENTATION 7
CONCLUSIONS 9
FIGURES
(following text)
I. Location Map
2. Irrigated Land
TABLES
(following Figures)
I. Rifle Land Associates Water Rights - Garfield County Airport Planned Unit
Development
2. Water Demands and Depletions - Garfield County Airport Planned Unit Development
3. Summary of Diversion Records - L&C Ditch
4. Summary of Diversion Records - Enterprise Ditch
5. Summary of Diversion Records - Last Chance Ditch
6. Annual Consumptive Irrigation Requirements in Acre -Feet - Garfield County Airport
Planned Unit Development
7. Average Historic Consumptive Use in Acre -Feet - Garfield County Airport Planned
Unit Development
8. Augmentation at Full Development in Acre -Feet - Garfield County Airport Planned
Unit Development
WATER RIGHTS INVESTIGATION
CONCERNED WITH THE
GARFIELD COUNTY AIRPORT PLANNED UNIT DEVELOPMENT
INTRODUCTION
This report presents the results of our water rights investigation for Rifle Land
Associates. Its purposes were to assess the water requirements of the Garfield County
Airport Planned Unit Development, to assess the historic use and consumptive use of
Rifle Land Associates' water rights, and to recommend technical components for possible
inclusion into a plan for augmentation. This investigation was completed by our Messrs.
Thomas A. Williamsen and Duane D. Helton.
GARFIELD COUNTY AIRPORT PLANNED UNIT DEVELOPMENT
The Garfield County Airport Planned Unit Development is being developed near the
Garfield County Airport, about four miles northeast of Rifle, Colorado (see Figure I). It
will include residential, commercial, and light industrial areas that will be developed
incrementally over the next 10 to 15 years. A population of about 7,000 is expected at
full development.
The development is occurring on part of what originally was a large sheep ranch.
The ranch included summer and winter pasture as well as about 270 acres of land
irrigated with water rights decreed for diversions from Beaver Creek, Mamm Creek, and
the Colorado River (see Table I). These water rights will be included in the plan for
augmentation for the Garfield County Airport Planned Unit Development.
The residential development at the Garfield County Airport Planned Unit
Development eventually will include about 620 single family units, 1,080 multi -family
units and 300 mobile homes. The irrigated lawn and garden areas should average not
more than 3,000 square feet per single family unit, 500 square feet per multi -family unit,
and 1,000 square feet per mobile home. The residential development will include a
school for 560 students with about 2 acres of irrigated lawn area. The commercial
development will include about 1,300,000 square feet of floor space with 10 acres of
irrigated lawn. Within the industrial area, about 1,200 people will be employed and about
31 acres of lawn will be irrigated. Also, a recreational vehicle camp and community park
will be constructed with about 20 acres of irrigated lawn.
During the initial phases of development, the water supply will be obtained through
the Crann Pipeline. Water for the Crann Pipeline is diverted from natural springs in the
Mamm Creek watershed (see Figure 1 and Table 1). It was decreed in Civil Action
No. 1333 on November 25, 1908 "absolutely" for 0.083 cfs for irrigation purposes and
0.333 cfs for domestic and livestock watering purposes and "conditionally" for 0.583 cfs
for irrigation purposes. In Case No. 82CW21, the use of the absolute portions of the
water right (0.416 cfs) was changed to domestic, municipal, and commercial purposes,
and the conditional portion of the water right was cancelled.
When the water demands at the development exceed the water supply available
from the Crann Pipeline, additional municipal water will be diverted from the Last
Chance Ditch. The Last Chance Ditch diverts from the Colorado River about four miles
east of the Garfield County Airport. The Last Chance Ditch was decreed in Civil Action
No. 89 on May 5, 1888 for 50.0 cfs for irrigation purposes. Rifle Land Associates own
200 shares of the Loesch and Crann Ditch Company, which owns and operates the Last
Chance Ditch. These 200 shares correspond to 3.67 cfs of the total 50 cfs decreed
diversion rate. Municipal water will be pumped from the Last Chance Ditch at a point
just upstream from a siphon across Mamm Creek. Additionally, two wells will be drilled
(Permit Nos. 121252 and 121253) in the Colorado River alluvium. These wells will
provide water for fire protection and also will serve as emergency backups to the water
supplies available from the Last Chance Ditch and Crann Pipeline.
Wastewater from in -building water uses will be collected and treated in a
centralized sewage system. The treated wastewater will be returned to the Colorado
River. Typically, the depletions from in -building water uses average about five percent
of the diversions in this type of sewage system.
WATER DEMANDS AND DEPLETIONS
We have estimated the water demands and depletions for the Garfield County
Airport Planned Unit Development based on the following criteria:
1. The single family dwelling units will contain an average of 3.5 people, and the
multi -family dwelling units and the mobile homes will contain an average of
3.0 people.
2. The in -building water uses in the residential areas will average about 80
gallons per capita per day.
2
3. The in -building water uses in the commercial areas will average 12 gallons per
100 square feet of floor space per day.
4. The in -building water uses in the industrial areas will average 30 gallons per
employee per day.
5. The in -building water uses at the school will average 20 gallons per student per
day during September 1 through May 31 (6 days per week).
6. The water uses at the recreational vehicle camp and community park will be
equivalent to 410 single family dwelling units.
7. The consumptive use resulting from the irrigation of lawns, parks, and gardens
will average 2.18 acre-feet per acre during an irrigation season that extends
from May I through September 30. This value was based on a Blaney-Criddle
computation and included an allowance for evaporation and wind -drift.
Based on these criteria, the total water demands at full development will average
1,258.8 acre-feet per year. The water depletions will average 320.66 acre-feet per year
hich can be broken down into about 46.06 acre-feet per year for in -building water uses
%Ind 274.6 acre-feet per year for the irrigation of lawns, parks, and gardens. The water
,krnands, water depletions, and monthly depletion percentages are shown in Table 2. The
,kkpletion percentages reflect the percentages of the water demands that will be
,k-pleted; they range from a low of 5 percent in the winter months to a high of 47.5
oercent in July.
•IFLE LAND ASSOCIATES WATER RIGHTS
As mentioned previously, the Garfield County Airport Planned Unit Development is
Wing developed on part of what originally was a large sheep ranch. The ranch included
2.3 acres of irrigated land. The water rights that were used to irrigate this land
\'luded the water rights for the L&C Ditch, the Vaughn Reservoir, and the Crann
',;.reline and portions of the water rights for the Enterprise and Last Chance Ditches.
\;rtinent data for these water rights are shown in Table I, and they are discussed
uividually in the following paragraphs. The data for historic diversions were compiled
n the records of the Colorado State Engineer in Denver.
3
L&C Ditch
Water for the L&C Ditch is diverted from Beaver Creek, which is not shown in
Figure I, but is the major drainage just west of Mamm Creek. Dry Creek is used as a
carrier channel for a short segment between the diversion point and the irrigated land.
The L&C Ditch was decreed originally in Civil Action No. 520 on April 8, 1893 for
40.0 cfs for irrigation purposes. In Civil Action No. 2071 on December 12, 1921, the
diversion rate was further reduced to 14.2 cfs. In Case No. W-287 in 1971, the point of
diversion was changed to the point of diversion for the Beaver Creek/Grass Mesa Ditch
and the diversion rate was further reduced to 10 cfs. In Case No.179CW 10, the point of
diversion was moved back to the original diversion point.
The Water Commissioner's records for water years 1960-79 are summarized in
Table 3. As is not unusual for Water Division 5, these records are incomplete, providing
data for only 14 of the 20 years. Some of the missing records probably can be attributed
to the changes to the point of diversion that occurred in the 1970's. No water was
diverted during 7 of the 14 years for which data are available, while a total of 1,372
acre-feet were diverted during the remaining 7 years. The diversions averaged 106 acre-
feet per year during the 14 years. Mr. A. Woody, the present ranch operator, reported to
us that the L&C priority normally provides water for two to three weeks during each
year.
Enterprise Ditch
The water rights for the Enterprise Ditch were decreed originally for the diversion
of up to 43.5 cfs for irrigation purposes in Civil Action No. 520 on April 8, 1893, and
Civil Action No. 1232 on April 22, 1907. Rifle Land Associates owns a one-third interest
in these water rights. Their source of supply is West Mamm Creek. The diversion
records for the Enterprise Ditch are shown in Table 4. During the 10 years for which
data are available, the diversions averaged 126 acre-feet per year and occurred during an
average of 158 days per year.
Last Chance Ditch
As mentioned previously, the Last Chance Ditch was decreed in Civil Action No. 89
on May 5, 1888 for 50 cfs for irrigation purposes. Rifle Land Associates own 200 shares
in the Loesch and Crann Ditch Company which owns and operates the Last Chance
4
Ditch. These 200 shares are equivalent to a diversion rate of 3.67 cfs. This water right
is one of the senior water rights on the Colorado River; consequently, water should be
available to it on demand.
The water diversion records for the Last Chance Ditch for water years 1961-80 are
summarized in Table 5. Records are not available for 7 of the 20 years. During the
remaining 13 years the diversions averaged over 11,000 acre-feet per year while ranging
from a low of 5,240 acre-feet in 1971 to over 16,000 acre-feet in 1963. On the average,
diversions occurred 200 days per year, resulting in an average diversion rate of 27.6 cfs.
Rifle Land Associates' interest in the Last Chance Ditch is 7.34 percent of the total.
Prorating historic diversions according to this percentage showed that an average of 809
acre-feet corresponded to Rifle Land Associates' interest. The minimum was 385 acre-
feet in 1971. These values are only a relatively small part of the 1,600 acre-feet that
would have been available by diverting at a continuous rate of 3.67 cfs during a 200 -day
irrigation season.
Rainbow Ditch
The Rainbow Ditch was constructed in about 1967. Its point of diversion is located
on Mamm Creek about 3.5 miles upstream from its mouth. It was used as an alternate
point of diversion for Rifle Land Associates' water rights in the Enterprise and Last
Chance Ditches. The historic practice of diverting Enterprise water into the Rainbow
Ditch was legalized in Case No. 80CW275. Diversion records for this ditch are available
only for 1969. During that year, 707 acre-feet were diverted during 85 days for an
average diversion rate of 4.16 cfs.
Crann Pipeline
This water right was described previously in this report. Water for the Crann
Pipeline is diverted from natural springs in the Mamm Creek watershed. As presently
decreed, it allows diversions at rates up to 0.416 cfs for domestic, municipal, and
commercial purposes with the limitation that the consumptive use shall not exceed 9.73
acre-feet per year. This water right will be used to provide municipal water for the
development. If the water diverted under this water right is used for in -building
purposes, it should provide up to 195 acre-feet per year for the development. This is
about 15 percent of the total water demand projected for the development.
5
Vaughn Reservoir
Vaughn Reservoir is an off -channel reservoir located about 1.5 miles south of the
airport. It was decreed in Civil Action No. 520 on April 8, 1893 for the storage of 160.7
acre-feet for irrigtion purposes. The L&C Ditch supplies Vaughn Reservoir with water
diverted from both Beaver and Mamm Creeks.
HISTORIC CONSUMPTIVE USE
Our analysis of the historic consumptive use of the Rifle Land Associates' water
rights was based on the cropping patterns and irrigation practices described to us by Mr.
T. V. Garel and Mr. A. Woody. We used the Modified Blaney-Criddle Method developed
by the U.S. Soil Conservation Service and described in Technical Paper No. 21 to
compute the values for the historic consumptive water requirements, the effective
precipitation, and the consumptive irrigation requirements. Our analysis was performed
on a monthly basis using temperature and precipitation data for water years 1961-80; the
climatic and streamflow data for this period are representative of the longer term.
Moreover, Mr. Woody was involved with the operation of the ranch beginning in 1963.
The water rights previously described were used to irrigate 272.3 acres of land as
shown on Figure 2. The irrigation water was distributed on the property through a series
of laterals. Tailwater was collected from the upper fields and distributed to the lower
fields, resulting in a relatively efficient irrigation practice. The cropping pattern in the
area north of the airport was about one-sixth small grains and about five -sixths alfalfa.
The area south of the airport was irrigated pasture. The small grains, the pasture, and
about 20 percent of the alfalfa were irrigated fully while 80 percent of alfalfa received
three irrigations during the year, with each irrigation consisting of a water application of
about six inches. The irrigtion season generally began in mid- to late- April and extended
into early October.
We began our analysis by estimating the consumptive water requirements for each
of the crops. The consumptive water requirements for small grains were assumed to be
equivalent to those for spring wheat. Then, the values for effective precipitation were
computed and subtracted from corresponding values for the consumptive water
requirements to derive values for the consumptive irrigation requirements. A summary
of the annual consumptive irrigation requirements for the various crops during each year
of the analysis period is shown on Table 6. The averages were 1.75 acre-feet per acre for
pasture, 1.06 acre-feet per acre for spring wheat, and 1.90 acre-feet per acre for the
alfalfa.
6
Based on the historic irrigation practices and irrigated acreages, the consumptive
irrigation requirements averaged 346.3 acre-feet per year. Diversions averaging 462
acre-feet per year were necessary to satisfy the consumptive irrigation requirements.
This volume of water, undoubtedly, was available and diverted under the water rights
owned by Rifle Land Associates. The minimum volume of water available under the Last
Chance water right by itself was 385 acre-feet in 1971,'pnd more could have been
obtained if the other water rights had not made up the deficiency. Therefore, we
estimated that the consumptive use resulting from irrigation on the ranch averaged about
346.3 acre-feet per year. A monthly breakdown of this average consumptive use is shown
in Table 7.
PLAN FOR AUGMENTATION
The consumptive use historically associated with the Rifle Land Associates' water
rights (346.3 acre-feet per year) exceeds the municipal water depletions projected for
the Garfield County Airport Planned Unit Development (320.66 acre-feet per year). This
indicates that the water rights should be adequate to provide the required replacement
water. We recommend that water rights be obtained for municipal, commercial, and
industrial uses at the Last Chance diversion points and the two alluvial wells. The plan
for augmentation should contain the following provisions:
I. The municipal water diversions would be measured and recorded on a monthly
basis. The out -of -priority municipal diversions would be accounted separately,
and out -of -priority depletions would be computed according to the monthly
depletion percentages shown in Table 2 and replaced as provided below.
2. The water rights should be removed from irrigation and the irrigated areas
should be taken out of agricultural production incrementally as the residential,
commercial, and light industrial development occurs.
3. As this occurs, a "consumptive use stream credit" would be established. The
volume of the consumptive use stream credit would correspond proportionately
to the area taken out of irrigation and would accrue in monthly increments as
shown on Table 7.
4. This consumptive use stream credit would be used to replace directly the out -
of -priority municipal depletions from April through October. Excess
7
consumptive use stream credit would be stored in Vaughn Reservoir for future
releases for replacement purposes.
5. Sufficient excess consumptive use stream credit would be stored in Vaughn
Reservoir during the April through October period to replace the out -of -
priority municipal depletions that cannot be replaced directly with
consumptive use stream credit. At full develoi5ment, the release of about 30.3
acre-feet will be required during September through April.
6. Rifle Land Associates is attempting to obtain up to 10 acre-feet of water per
year from Ruedi Reservoir to integrate into its municipal water supply
system. This water also could be used to replace out -of -priority municipal
depletions.
7. Rifle Land Associates will install and maintain such water measuring devices
and implement such water -accounting procedures as may be required by the
Division Engineer for Water Division 5 to verify that sufficient augmentation
is occurring.
The operation of this plan for augmentation is depicted in Table 8 for a year at full
development. The municipal depletions are shown in the second column, totalling 320.66
acre-feet for the year. The consumptive use stream credits are shown in the third
column, totalling 346.30 acre-feet. This stream credit would be used to replace the out -
of -priority depletions directly during the historic irrigation season as indicated in the
fourth column or stored as indicated in the sixth column. When insufficient stream
credit is available to replace the out -of -priority depletions directly, water would be
released from storage as indicated in the fifth column. A total of 290.34 acre-feet would
be replaced directly, while a total of 30.32 acre-feet would be replaced by releasing
water from storage. A total of 55.96 acre-feet of consumptive use stream credit would
be available for storage.
It should be noted that up to 195 acre-feet per year of the municipal water supply
can be diverted under the Crann Pipeline water right; this diversion should not require
any augmentation. Also, some water should be available to the original municipal
priorities that will be obtained in connection with the plan for augmentation. These two
factors indicate that the actual augmentation requirements at full development should be
less than those reflected in Table 8, and a larger volume of consumptive use stream
credit will be available for storage.
8
CONCLUSIONS
1. At full development, the Garfield County Airport Planned Unit Development
will include about 620 single-family units, 1,080 multi -family units, 300 mobile
homes, a commercial area of 1,300,000 square feet, an industrial area in which
about 1,200 people will be employed, and a reccteational vehicle camp and
community park. The development will occur in phases over the next 10-15
years.
2. The water diversions at full development should average about 1,258.8 acre-
feet per year, of which about 380.0 acre-feet will be diverted during November
through March and about 878.8 acre-feet will be diverted during April through
October.
3. The municipal water depletions at the development should average about
320.66 acre-feet per year, of which about 19.20 acre-feet will be depleted
during November through March and 301.46 acre-feet will be depleted during
April through October.
4. A total of 272.3 acres of small grains, alfalfa, and pasture were irrigated as
part of the ranching operation during water years 1961-80. We estimated that
the consumptive use resulting from this irrigation averaged 346.3 acre-feet per
year.
5. The water rights described above should be adequate to augment the Garfield
County Airport Planned Unit Development. The land historically irrigated
with these water rights would be taken out of agricultural production, thus
establishing a consumptive use stream credit. This consumptive use stream
credit would be used either to replace the out -of -priority municipal depletions
directly during April through October or stored in Vaughn Reservoir. The out -
of -priority depletions exceeding the consumptive use stream credit would be
replaced by releasing water from Vaughn Reservoir.
9
DRAWN T. A.W.
T RACED. .R/'V•Su�
CH EC KED.1. .�.:!1....
cr
D0
07,1
Rifle
RI
ITC
N
--GARFIELD COUNTY
AIRPORT
N
S
30003000
?
1 1 . 1 I l 1
SCALE
IRRIGATED AREA ;
SHOWN IN FIGURE•
2 -'- -
• .CRANN PIPELINE
QI / AND DITCH ---
6000 FEET
CRA la A 1-25
O A
A
A
A AA AAA
I 70 GLENW000 DENVER
SPRINGS
RIFLE
AAA A
GRANDC 0 L: 0 R
JUNCTION A
A
A
A
AAAA A
A
AA A
A
A
oDURANGO
D 0
COLORADO
SPRINGS
PUEBLO
E
1-70
I-25 I
iTRINIOAD
INDEX MAP
VAUGHN
R ESERVOIR
RIFLE LAND ASSOCIATES
TIPTON ANDKALMBACH,INC.- ENGINEERS
GA RFI EL D COUNTY AIRPORT
PLANNED UNIT DEVELOPMENT
LOCATION MAP
TK 24-I
�/' 6A
APPROVED. ./ (- }J,C( MNAC .•
IP TON AND KAI MBACN, INC.
APPROVED.
DENVER,COLORADO
FEB. 19831 FIG. I
West
w. 1111
,■r i i i P W :s as a s p
0
RIFLE LAND ASSOCIATES WATER RIGHTS
GARFIELD COUNTY AIRPORT PLANNED UNIT DEVELOPMENT
c
0
CO
ON C
0
CO
Decreed Use
Diversion Rate
Source of Supply
Structure Name
- cn 0 0
OT M M — —
N CO CO Co
z
CT
N
C)
0)
0
U
c
M 1— N — — N .E
O CO a C\ Q\ ON 0
C\ CO CO CO CO CO
....... .-..... 0
- N s.0— O O — -.1-a)
— ON M it r- t\ M L
o o o 00 o 0
L
a)
+-
c
w
a)
L
CO CO M C') r- O M 4-
O-. Co co Co cr. cr. Co 4—
U) U) CD CO N — CO a)
N 0 0O N (-'') O a)
— — � ►-
— O 0 00 — O a)
0 �'V C C C C c a o C
aL o 0 .2 0 .2 a._ o
h a) +_ 4- - :-. _ v,
O V E 0 0 O O 0 .0 a) 0
E'Cco 0 0 'c-Ecp
4- 4- 4- 4-w 4-
0 0 0 0 0 0
N 1� 0 M r- N
- \O O C`7 — Q\
O cY) O re) — rn
Natural springs
Crann Pipeline
Colorado River
Last Chance Ditch
Beaver Creek
L & C Ditch
West Mamm Creek
Enterprise Ditch
a- J
a)
L
U
E
E
0
Rainbow Ditch'
160.7 ac -ft
Mamm Creek
Vaughn Reservoir
h
a)
4-
•
O
L
a
-o
0
h
a)
a)
0
0
a)
L
4-
L
0
4—
.N
L
a)
>
4--
O
d --
C
O
a
(1)
+-
0
c
L
v
,-
0
c
0
0
0
CD
s
wU
— o
co
0
Z
F
z
w
0
w
Cr)
z
o
1- - Z
w D
J
a 0
w UJ
o z
z
0
Z J
Q 0
O CY
z 0
CL
cc
w —
O
>-
o -
CC I-
0_
CD
c
O
4-
Depletions (Acre -Feet)
Percentage
4-
0 }O
H
L
4-
7 7
c
(0
U
L
m
E
E
O
U
a)
4-
0 0
1-
0 0 0 0 u\ r u, (0 0, 0 0 0
U\ • U\ Ul U\ M N r N - Ul al U\
M V V V M
• V V V' V' V' V V V
Cr,'0 ON r r N U\ 'O r O' r 0,
M N1 M M- • V V r M rn rn
• (0 CO '0 M
00 U1 '0 r 0
• • r 0 o •-•v
M '0 m ,0 M
N N N N N N N N N N N N
0 ▪ 0 0 0 0 0 0 0 0 0 0 O
✓ r r r r n r r n r r v
0 ▪ 0 0 0 0 0 0 0 0 0 0 0 03
✓ V V V V V sr V V
0 0 0 0 0 0 0 0 0
1 •
0• 0000 1 0000
00-00300300030030 I U•
MN M N M N M M N M N• M V'
O ifl 0 U\ '0 M 0 M O U\ 0
c0 • O c0 al s{ O co V O CO U\ co
✓ r r r CV ill r U\ - r r r
c
O
} (0 (0 00 ON 00
10 1 ,O al O ,0 N 1 1
c r o N v L
M
O0
•O
N
r
N
M
-.7 M .7 M V '7 M V M V ^•
M • tel M M M M M M M tel M M
03 V c0 V 00 V 00 CO V 00 V (0
✓ • M Q V V V V V V V V V'
V
'O
•
r
CO 00 0D 00 O c0 00 O0 N N
1
O • O O O O 1 I O O O O r
0 N 0 0 0 0 0 0 0 0 0 0
0' 30 • rO; • rON0 O'
• r • r •
0,
V\ U\ U\ U\ U\ U\ U\ U\ U\ U\ U\ U\
N
v
0,
'0
to
c .0 L L >' 0' a } > U
4-
10
10 m 10 . l0 7 7 7 m 0 0 m 0
✓ w f 4 F -,- in 0 Z 0 H
for the recreational
the table.
5
.0
E
0
U
c
CD
.0
lawn areas have
CD
4-
a) a)
01
L
L
CD
t
4-
.0 .0
♦-
•
4-
X
X
m }
}4- c
CD m
t E
} 0.
0
_ m
v >
m m
L —
u 0
• +-
'0
v m
N
• Vf
ID m
m L
} m
7
n +-
0
O 0
U
tri
m
m
Table 3
SUMMARY OF DIVERSION RECORDS
L & C DITCH
Number Average Number
Water of Days Acre -Feet Daily of
Year Used Used (cfs) Acres
1960 27 266 4.93 100
61 8 48 3.00 375
62 44 456 5.18 375
631 - - - -
64 15 133 4.44 375
1965
66
672
681
69
19
0
20
162 4.26 375
0 0 -
200 5.00 -
1970 0 0 0 -
711 - - - -
721 - - - -
73 0 0 0
743 0 0 0
1975 7 97 6.93
76 0 0 0
774 0 0 0
781 - -
791 - -
Averages 11 106 4.82
1 No record
2 Water diverted for about one week
3 Transferred to the Grass Mesa Ditch
4 Structure not useable - no legal diversion point
5 Average of 13 years
Table 4
SUMMARY OF DIVERSION RECORDS
ENTERPRISE DITCH
Number Average Number
Water of Days Acre -Feet Daily of
Year Used Used (cfs) Acres
1961
62
63
64
65
1966
67
68
69
70
1971
72
73
74
75
0.2 .10
91 178 0.98 320
156 102 0.33 80
196 102 0.26 40
178 94 0.26 80
1976 145 60 0.21 40
77 199 57 0.14 40
78 209 151 0.36 40
79 198 264 0.67 40
80 207 255 0.62 40
Average2 158 126 0.40
No record
2 Average of 10 years
Table 5
SUMMARY OF DIVERSION RECORDS
LAST CHANCE DITCH
Number Average Number
Water of Days Acre -Feet Daily of
Year Used Used (cfs) Acres
1961 197 12,608 32 1,200
62 193 7,720 20 1,200
63 214 16,234 38 1,200
64199 14,328 36 1,200
651 - - - -
19661 - - -
671 - - -
681 - - -
691 - - -
701 _ - -
1971 154 5,240 17 -
72 214 15,999 37 1,660
73 214 13,352 31 800
741 - - -
75 208 9,242 22 700
1976 203 12,582 31 850
77 208 10,157 24 850
78 212 7,972 19 850
79 210 9,127 22 850
80 180 8,728 24 850
Average2 200 11,022 27.6 939
1 No record
2 Average of 13 years
Table 6
ANNUAL CONSUMPTIVE IRRIGATION REQUIREMENTS
IN ACRE-FEET
GARFIELD COUNTY AIRPORT PLANNED UNIT DEVELOPMENT
Water Pasture Sing
Year Grass Wheat Alfalfa
1961 .67 1.15 1.86
62 .78 1.08 1.89
63 .87 1.17 1.99
64 .76 1.00 1.86
65 .58 0.96 1.66
1966 .98 1.24 2.19
67 .60 0.84 1.68
68 .72 1.12 1.92
69 .72 1.07 1.92
70 .53 0.96 1.79
1971 .69 1.09 1.91
72 .69 1.11 1.92
73 .58 0.90 1.69
74 .87 1.17 2.03
75 .68 0.95 1.84
1976 .66 0.98 1.79
77 .95 1.31 2.08
78 .93 1.13 2.03
79 2.01 1.02 .11
80 1.70 1.03 1.92
Average 1.75 1.06 1.90
1
1
1
1
1
Table 7
AVERAGE HISTO IC CONSUMPTIVE USE I
IN ACRE-FEET
GARFIELD COUNTY AIRPORT PLANNED UNIT DEVELOPMENT
'Alfalfa
Pasture2 Spring3 Full Water4 Three
Month Grass Wheat Supply Irrigations' Total
April 1.5 2.2 - - 3.7
May 3.1 10.8 11.2 32.2 57.3
June 5.0 19.8 17.6 32.2 74.6
July 6.8 12.5 24.1 64.3 107.7
August 5.3 0.4 18.5 48.2 72.4
September 3.0 - 10.3 16.1 29.4
October 1.2 -
TOTAL 25.9 45.7 81.7
I Water years 1961-80
2 14.8 acres
3 43.0 acres
43.0 acres
5 171.5 acres
1.2
193.0 346.3
Table 8
AUGMENTATION AT FULL DEVELOPMENT
IN ACRE-FEET
GARFIELD COUNTY AIRPORT PLANNED UNIT DEVELOPMENT
Municipal Consumptive Use Augmentation Available
Month Depletions Stream Credit Direct From Storage for Storage
January 3.94 - - 3.94
February 3.64 - - 3.64
March 3.94 - - 3.94
April 3.74 3.70 3.70 0.04
May 41.74 57.30 41.74 - 15.56
June 64.20 74.60 64.20 - 10.40
July 84.50 107.70 84.50 - 23.20
August 65.60 72.40 65.60 0 6.80
September 37.74 29.40 29.40 8.34
October 3.94 1.20 1.20 2.74
November 3.74 - - 3.74
December 3.94 - - 3.94
TOTAL 320.66 346.30 290.34 30.32 55.96