575 Ft. Collins study and report (7)

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SECTION I I

THE FORT COLLINS WATER SYSTEM GENERAL

Fort Collins is the county seat and largest city in Larimer County, and eighth largest city in the State. It is located on the Cache La Poudre River along the historic Overland Trai 1 near the foothills of the Rockies, five miles west of Interstate 25 on U. S. Highway 287 and Colorado Highways 1 and 14.

The City is a trade center in one of Colorado's major agricultural areas. Its economy is heavily oriented towards agriculture, though the mineral and industrial contribution is significant. It is the home of Colorado State University, which also has a strong influence on local economy and business. Fort Coll ins is a home-rule City with a Counci I-Manager form of government and has both City and regional plannins commissions to aid in planning for orderly growth and development of the area. Since 1950 the City has

exper-ienced a rapid growth in population which is expected to continue in the future.

Recent estimates have placed the 1970 population of Fort Collins at 42,000 to 48,000 persons, a sharp increase over the 1960 population of 25,000. At the end of 1967 the City was delivering 9200 acre feet of water annually to a population of 41,000, indicating the higher estimate of population 1 isted above is more nearly correct. The rapid growth experienced by the City in the past decade, and which is expected to continue in the future, has made it necessary for the City to develop and carry out an ambitious and expanded plan of water supply development.

SOURCE OF SUPPLY

Water for the Fort Collins municipal system comes from direct flow rights diverted from the Cache La Poudre River and by releases from Horsetooth Reservoir, a unit of the Colorado-Big Thompson (C-BT) Project, the latter obtained t hrough ownership of Northern Colorado Conservancy District units. Water from Horsetooth Reservoir can be released to the Cache La Poudre River

in exchange for water diverted from the River or can be released directly to a new 15 million gallon per day (MGD) treatment plant being constructed in Soldier Canyon west of the City.

The Colorado-Big Thompson Project comprises a system of diversion, stora ge and conveyance works providing for the annual diversion of up to 310,000 acre feet of supplemental irrigation water for lands within the Northern Colorado Water Conservancy District whose offices are in Loveland, Colorado. Principal features of the Project include Lake Granby which stores water diverted from the Colorado River and tributaries, Shadow Mountain Reservoir which receives water pumped from Lake Granby, and Grand Lake, adjacent to Shadow Mountain Lake, which diverts water through the Alva B. Adams Tunnel. On the east slope the diverted water is released from the tunnel near Estes Park and

conveyed through a series of power plants, storage reservoirs, and canals to users within the District. The Green Mountain Dam on the Blue River is also part of the Project, providing replacement storage for Colorado River users and power generations for repayment of project cost.

Water from the Colorado-Big Thompson Project is del ivered on the basis of estimated requirements of the eastern slope, estimat~s of runoff for the season and avai !ability of water to the proj ect. The r ight to receive project water is s ignified by ownership of C-BT acre-feet units. There are

310,000

units, correspondin g to the maximum amount of water than can be delivered to users in any year. The annual yield of a unit ls termed its "quota" and may be as high as one acre foot, or as low as

0, 60

acre foot. The quota is established by t he District each year prior to t he irri gat ion season and can be adj usted in either direction after the season starts if conditions are mate r ially different than anticipated .

Analysis of District operations since

1954

indicates that the avera ge declared quota is

0.78

acre feet, which represents the yield of one unit of C-BT water. The average delivered yield is

0.74

acre feet per unit, slightly less than the declared quota because of non-payment of assessments by some users and the fact that some users do not request all of the i r water to be released in some years. The h istoric yield of C-BT units and

the yield of t he present

9168

units owned by the City of Fort Collins are shown in Table 1.

Table

YIELD OF COLORADO- BIG THOMPSON PROJECT UN ITS

Declared Total Reservoir Delivered Yield of Cit y 's

Quota -

%

Releases for Yield

9168

Units based

of

310,000

the year per Unit on Declared Ouota

Year _(Acr(

2

)eet) _{Acre Feet) {Acre Feet} {Ac re Feet}

(T)

(3)

(4)

(5)

1954

0. 97;';

301,486

0.97

8893

1955

0. 77;•;

238 ,062

0, 77

7059

1956

o.

58-1:

_{177' 228}

0.58

5317

1957

0.60

122,872

0.39

5501

1958

1.

00

288,065

0.93

9168

1959

0.80

232,993

0.75

7334

1960

0.70

214, 165

0.69

6418

1961

0.60

132,394

0.43

5501

1962

0.75

282,901

0.91

6876

1963

1.

00

298,282

0.96

9168

1964

0.90

277' 349

0.89

8251

1965

0.60

135, 662

0.44

5501

1966

1.

00

303,776

0.98

9168

1967

0.70

198 ,352

0.64

6418

Mean

0.78

228,660

0.74

7184

;'•Delivered Yield

Ex.!l'l'lfnatlon of. Table 1 shows that the average yield of the City's

9168

C- BT units for t he period

1954

t hrough

1967

would be

7184

acre feet per vear. It should be noted, howe ver , that the yield i s ~ reatest in dry years

su e ~ as

1958, 1963,

and

1966,

whereas it is lowest in wet years such as

1957, 1961

and

1965.

Th is reflects the advantages der i ved from the opera-tions of carry-over stora ge facilities in which years of abundant supply are used to f i

11

the reservoirs so that supplemental water is available in years of low surface runoff. To the City of Fort Collins it means that storage water is available to supplement direct flow rights during periods of high demand when direct flow ri ghts are not adequate.

Water ri ghts owned by the City, including C-BT, direct flow rights from the Cac he La Poudre River at t he existing diversion structure, and ownership in various ditch companies wh ich provide water to the Fort Coll ins area, are summarized below:

Table 2

FORT COLLINS WATER RIGHTS (As of April

29, 1968)

A. Colorado-Big Thompson Project (C-BT) B. Direct Flow from Cac he La Poudre River

Name Date

_---

Priority

Yea ger June

_{1' 1860}

1

Pioneer March

1, 1862

5

Boyd & Freeman March

_{15' 1862}

6

Pioneer September

15, 1864

12

Brown May

_{1' 1865}

14

Total

9168

units No . Amount cfs

3.50

2. 15;':

7.00

2.

78;':

4.50

19.93

;'•Diversion period limited to Apri l

15

to October

15

of each year without replacement. From October

15

to Apri 1

15

of next year, water may be diverted on these ri gh ts provided it is replaced with an equal amount of water from sources ot her t han waters which are .naturally tri Jutary to the Cache La Poudre River .

C. Owners h ip in Irrigation Ditch Companies: Name

---

---Pleasant Valley and Lake Ditch Co. New Mercer Ditch

Larimer Canal No. 2 Arthur Ditch

Nort h Poudre Canal Co.

Sha res

41.61

8.61

8.00

125.24

365.75

The potential yield of the direct flow rights to the City was determined on

a daily basis for a 1952 through 1957 study period by W" W. Wheeler and

Associates.* The results of the Wheeler study are sunmarl zed in Table 3.

Table 3

POTENTI AL YI ELD OF FORT COLLINS CACHE LA POUDRE RIGHTS

(All values are In acre feet)

Year Jan Feb Mar

Apr

May

Jun Jul Aug

Sep

Oct Nov Dec Total

1952 930 840 930 1060 1240 1200 1240 1210 1170 1060 900 930 12,710

1953 920 840 920 1160 1240 1200 1240 1240 950 1240 900 930 12,780

1954 930 840 930 1060 1240 1200 1210 920

790 1050 860 730 11,760

1955 890 610 900 1040 1240 1200 1240 1240 1200 1070 900 930 12,460

1956 930 830 930 1060 1240 1200 1240 1240 990 1070 740 930 12,400

1957 930 830 920 1060 1240 1200 1240 1240 1200 1240 900 930 12,930

Table 4 summarizes the annual yield of the City's owne rship in five Irrigation

ditch companies based on the 1952 through 1957 study period, along wi t h the

total active shares and shares owned by Fort Coll lns o

Table 4

YIELD OF FORT COLLINS IRRIGATION DITCH WATER RIGHTS

(1

Pleasant Valley

&

Lake Ditch Co.

New Mercer Ditch

Larimer Co. Canal

Noo 2

Arthur Ditch

North Poudre

Canal

Co o

Total

No. of

Active

Shares

(2)

261

140

146

1,

210

10,000

Shares owned by

Ft. Coll ins 4/68 Annual Yield of Fort Coll Ins Shares

Number

(3)

41 061

8 061

8.00

125.24

365 075

%

In acre feet

of Tot al

J..i8

JID

~

..!..222.

.!ill J..i2l

(4)

(5)

(6)

(7)

(8)

(9) (10)

15.94 2313 2116 1935 2716 2566 2343

6.

15

5o48

10.35

3.66

286

381

603

2200

377

460

574

1755

153

66

533

1305

343

490

676

1425

359

465

640

1745

493

416

667

2530

5783 5282 3992 5650 5775 6449

*Report on the Water Resources of Ft. Coll ins, W. W. Wheeler & Associat es

Water from the North Poudre Cana l Company can be used by exchange from Horsetooth Reservoir or by re lease from moun t ain res e rvoirs . Wa ter avail-able through ownership In the other di t ch companies mus t be tran s ferr ed or pumped for use in the municipal sys tem, exc luding that whi ch ls pre-sently used for parks, ceme tery and golf course irrigation.

The annual yield of the vari ous sources of supply prese nt ly ava i l able to the City of Fort Coll lns, based on a

1952

through

1957

study period, ar e summarized below:

Average Minimum

1954

Annua 1 Annual Annua 1

Yield Yi e ld Yie ld

Source (Acre Feet)( ~c re Feet)(Ac re Feet)

(2Y

(3)

(4)

l

Colorado - Big Thompson,

9168

units

7. 184

5, 317

8,893

Direct Flow -

19 093

cfs

12,507

11, 760

11, 760

North Poudre Canal Co.,

365.75

shares

1 ,827

l

.305

l,

305

Sub-Tota 1

2

l,

518

18,382

21, 958

Shares in Other Ditch Compani es ~1663

2

1

68z

2

1

68z

Total

25, 181

21, 069

24. 645

As previous ly mentioned, t he water available through ownership In ditch

companies other than the North Poudre Canal Company mus t be pumped, exc hanged, or transferred to be used in the muni c ipa l sys tem. From the data pres ent ed

in the above tabul a tion, it ca n be seen that the lowest flow year of t he study period

(1954)

did not correspond wi th the year of lowest yield f rom t he Colorado - Big Thompson Project, I llustrating the advantages of t his source

In providing a dependable s upply .

Water supply studies have been made to determine the population that could be served by the City's present water rights. The s tudies were made on a monthly basis and It was assumed that all rights pre se ntly owned could be used " A loss of

20%

was applied to the Nor t h Poudre Canal Company supply and 10"/o to the supply obtained from the other irrigation ditch compani es . The studies were based on the yield of rights determined for the year

1956

which Is the criti ca l year of the

1952

through

1957

study period because of the low quota of the Colorado - Big Thompson Projec t.

Water requirements we re deter mined on a monthly bas is by analysis of past water use, data pres ented In the Wheeler and Banne r>'• reports, and considera-t ion of considera-the high per capiconsidera-ta us e whi ch considera-the Ciconsidera-ty has s usconsidera-tained in considera-the pasconsidera-t. The per capita water use in Fort Coll ins as reflected In past records is considerably higher than in other cities of comparable s i ze and location, a condition which is the result of several factors, t he most prominent being *Report on Existing Water Supply Facil I t ies and Proposed Improvemen t s by

•

the student population, a high percentage of flat rate users and distribution system losses.

Results of the monthly water studies Indicate that with present water rights a population of

70,000

could be served with no shortages, and a population of approximately

95,000

could be served with a shortage of approximately

20%

which is considered tolerable " Table 5 shows t he monthly demand and supply for a population of

70,000.

Table

5

\./ATER SUPPLY FOR A POPULATION OF

70,000

Source of SUQQl :z'.

Other lrri-Regulrements Noo Poudre C-BT at tlon Ditch Direct Flow Canal Co.

58°/o

Quota Compani es Month ~) (Acre Feet) (Acre Feet) (Acre Feet) (Ac re Feet) (Ac re Feet)

( 1)

(2)

(3)

(4)

(5)

(6)

( 7) Jan.

160

1,060

930

130

Feb o

160

970

830

140

Maro

160

1,060

930

130

Apr.

250

1,610

1,060

200

309

41

May

400

2,660

I, 240

230

140

I, 050

Jun.

450

2,890

1, 200

240

207

I, 243

Jul.

500

3,320

1, 240

256

1.

357

467

Aug.

450

2,980

I, 240

240

I,

063

437

Sept.

350

2,250

990

230

796

234

Octo

250

I, 670

1,

070

446

154

Nov.

160

I ,030

740

290

Dec.

160

I 1,

060

930

130

Total

22,560

12,400

1, 396

5. 138

3,626

Surplus

179

Total C-BT Quota

5,317

Notes: Col.

(1)

gpcd Is gallons per capita per day, annual average=

288.

Col o (5)

20%

losses taken.

Col.

(6)

This

58%

quota was In early project years. Current operating practices would probably result In a higher quota under similar conditions.

Col . (7)

10"/o

losses taken . PHYSICAL FACILITIES

Diversions from the Cache La Poudre River to the present treatment plan t are made by a concrete diversion structure located in Sect ion

32,

Township

9

North, Range

70

West and conveyed approximately one quarter mile to a 17 mill Ion

gallon per day (MGD) treatment plant situated on the south bank of the River. Treated water from this plant is carried from the plant to the Bingham Hill and Soldier Canyon clear water storage reservo irs and directly to the distr i-bution system. The Bingham Hill reservoir ls a rectangular reinforced con-crete clear water storage structure with a capa c ity of

4.5

mill ion gal Ions

()

{

..

•

At Soldier Canyon, about two miles west of the City, there are two concrete storage fa c ilities with a combined capacity of 22 million gallons. As pre-viously mentioned, the City currently has under construction a new 15 million gallon c lear water storage reservoir which will bring the total treated

water storage at Soldier Canyon to 37 million gallons. Additional storage, as well as some surge control, Is provided by a steel standpipe located about 1

.5

miles northwest of the City 1 lmlts having an operating depth of 64 feet, providing 150,000 gallons of storage. The total clear water storage avail-able to the City upon completion of the new Soldier Canyon reservoir wi ll be 41.65 million gallons.

The City also has under construction a 15 MGD rapid sand f i lter treatment plant scheduled to go into operation In September of

1970.

This plant w; ll be suppl led by releases from Horsetooth Reservoir through the Soldier Canyon outlet works and can be operated at a rate of 24 MGD during periods of peak demand. Treated water will go to the Soldier Canyon reservoirs and then directly to the distribution system through a recently constructed primary transmission line. Operation of the new Soldier Canyon Plant wi ll bring about two significant advant~ges to the City; the el imlnatlon of winter

diversion problems and the minimi z ing of the minor losses incurred by con-veying Colorado - Big Thompson water in the Cache La Poudre River o

Studies of the Fort Coll Ins water supply system made In 1964 by

J.

T. Banner and Associates Indicated that In several major portions of the system ade-quate operating pressures were not being sustained under normal and peak demand conditions. To remedy these deficiencies the City In 1965 install ed a series of primary transmission lines from the Soldier Canyon storage

reservoirs to the distribution system along with several other primary feeders. These Improvements provide adequate operating pressures under present and

anticipated future peak demand conditions for a population of approximately

70,QOO o

The Improvement program undertaken by the City sin ce 1964 has substantially increased the City's water supply capability. Completion of the new Soldier Canyon treatment plant and treated water storage facll lty will provide a treated water supply capabll tty adequate to serve a population In excess of 75,000. Thus from both the standpoint of water supply, represented by ownership of water rights, and the delivery of treated water by the physi cal plant, the City ls In a position to supply water to a population a lmost twi ce as great as Is being served at present o

Dear Mr. Sherwood:

I am not sure that I can get the Fort Collins report done

Hay 15. You will recall that I did not understand the signal

correctly until about April 1 regarding the fact that I was to investigate th~ physical facilities as well as the water rights .

We will work towards an .earlier date for the report, of course. By the 15th I am sure that we can give you the basic answer&

desired. However, as you know, the typing, drafting, and printing up of a report Is somewhat time consuming, and this I suspect will not be completed by the 15th. If you push the "button" though, we will go on an emergency status, which includes weekends, and have a report In your hands by the 15th, if that date is particularly s I gn if leant.

I wt11 prepare a one or two paragraph synopsis of .the non_.

consumptive use contemplated from Horse Tooth; however; I would appre-ciate your having Bob jot .down a few notes as to his understahdlng of the use when he is In town next week. As you probably realize, my knowledge of the particular processes Involved is somewhat sketchy, and without Bob's help I will be shooting In the dark somewhat .

In regard t~ choosing other locations for the plant water use,

it will be relatively easy to change from one location to another once we have the basic work done .

Very truly yours

WRIGHT WATER ENGINEERS

BY. /{_

L.)~ ~