T0 0F ASPEN, COLORADO 0N STREAM AND WATER SUPPLY PREPARED BY DALE H- REA CONSULT1NG.ENGINEER 2200 CHENANGD COLORADO ASPENOO1046 a, 23%: 3% 3? 45%" ?n ASPENOO1047 The porpose of this.Preliminary Report is to.collect.data_that wills with the_$tate Engineer in December, l965 for reservoirs on Castle Creek and Maroon Creek. From time.to time, it will be necessary to oollect additional data that will_ ultimately lead to the preparation of Plans and Sp ecifications Ifor the constructionI_ of DaTs on bo_tb Castle and Maroon Creeks in accordance Tith the water filings. This report Till be supplemented froT year to Iyear as stream flow data becomes available from theI metering stations on the two creeks and the other water sheds. Whe metering station on Castle Creek was placed in operation on July l5, l968; eqdipment for placing the Maroon Creek metering Station in.operation has been Ordered and is in stock. Adverse weather tensed a pestponeTent of this-installation until'earlyel969. I report IiIs lImlted to Stream Gaglng, Hydrology and Water Supply because they offer a good beginning that is hIghly deSIrable and_ lays the foundation for collection of further needed data in order to adeQUately design the two dams. ASPEN001048 ASPENOO1049 ii. STREAM GAGING in the of 1968, the State Engineer was contacted regarding the establishment of stream gaging stations on Castle and Maroon Creeks. They stated they had no iunds or personnel to establish such a project and sUggested the U13. Geological Survey be contacted. Mr; Thad McLadghlin, Director of Water Resources and his District teginaer, hr. Ted hodlder at the Denver Federal teeter; De?Ver; taiorado were contacted; The sitdatlon was explained to them in detail. They advised that there was a federal participation program with cities for the construction of metering stations on streams that qualify. In such a program, the cha Geological Survey pays one-half of the lnstalietion cost and one?haif of the operating cost and the city pays the other half. However, they advised_that no funds were available for i968 with no knowledge of what would happen in l969. Estimated construction costs for cable way metering stations similar to those required on Castle or Maroon Creeks is $h,000 each; with an operating cost of $i,500 per year each. The cost of the metering etathn On ?astle Creek including an eStimate of installation Cost, which Was dOne by city personnel is as Follows: l. Stevens Water Level Recorder i82;55 2. Recorder Base and Cover 56.90 3. Heating Cable and lnsulatiOn - #l.87 h. Fabrication of galvanized steel header l50.#2 5. Staff gages l8.00 Total hateriai cegi'?? 5 tag 7e Estimated Construction Cost 250.26 Total Cost 700.00 - 2 ASPEN001050 The installation Drawing for the m?f?tih? Stiil?h is sh?hh oh Drawing No. i thclosed in this report; The drawing shows the design and location oF the floatweil recorder; reCOrder base and their location on the Castle Creek Diversion Damr The diversion dam is a concrete structure constructed in l96hi it divert: Water out of Castle Creek into a 36? rein? forced condrete pipeline that leads to the City of Aspen Filter Plant: The of all of these features on the contour map that accompanys this report. The Harooh Greek Gaglng StatiOn will contain the same equipment and material that was used on Castle Creek. Its cost is $hk3.7h. The metering equipment is placed on an existingxdiversLOn dam. This diversion dam_was constructed of Wakefield sheet piling censisting of vertical sheets of lumber with a very broad crest of lumber. Considerable carpentry work will required to preyent leaka?elthroaahgthe woodeh beards ?hd;to form a shsis level crest; :in addition it will be necessary to construct a timber stilling well into which the fabricatedgsteel float well will-project.--lt is estimated that the labor on this ihStaiiation will be making the total cost $l,200. -ihe location of this diversion dam is shown an the map accompanying this report. it was necessary to determine a coefficient of discharge for the Ogee Crest Type diversion dam. The ogee Crest projects above the stream bed only' a small amount because of the Washing in of rock into the stilling basin. it has been recommended that the rock back at the crest be cleaned out with a dozen periodically; so that the crest will always project above the bed of the stream. The sides are coincident with the sides of the approach channel ASPENOO1051 so that no lateral contraction of the water passing ever th? dew l? pgseibie, There is a definite valetit? sf ap?fda?h to the flow over the dam and it was therefdfe nod?ssary to correct for this condition in the formula. Figure was developed to give a coefficient of discharge for variable depths over the Ogee Crest which is in effect a correction for the velocity 3/2 . 2 of approach. The formula used is Ch (H g_ in which '5 a total discharge in were; Feet per second . a coefficient of discharge depending Upon the shape of Crest an! the depth of overflow? Effective length of crest I ll Static head measured from the top of crest to reservoir level E: Velocity head based upon the velocity of approach 29 - 'amraz Eli, Table No. 2 shows the discharge for the gaging station of 62513; break as described in this report and illustrated en Drawing No. T. Figure No. was used in arriving at these flow discharges. The table shows the discharge from July 15, to August 30, l968 to be approximately 140 cubic feet per second.when additional flow charts are received giving depth of flow, they will be reduced to flow in cubic feet per second and added to the report as supplements. a ASPENOO1052 as. ?3?w5 . war?? ASPENOO1053 The accumulation of Sediment is greatly affected by the characteristics cf the drainage basin, rate of precipitation and runof? and the stream itself. In the final design of a reservoir, these characteristics should be thoroughly studied and evaluated so that the proper capacity of the reservoir can be alloted to sediment. in general, both reservoirs will be situated in deep canyons, long and narrow in dimension, with'fairlv steep walls. The dams are located about 3,000 feet above sea level and'the drainage basin raises to the-Continental Divide at elevations in excess of l3,000 feet. Host of the drainage basin will be above timberline with steep,rocky slopes. The abandoned ?Ghost? town of Ashcroft lies just upstream from the end of the Castle Creek Reservoir. Both basins are in the White River National Forest and there is not expected to be any actIVIty that Iwould change the watershed character? istics. west Maroon Creek has several la?es in its yatershed. This branch is situated in a primative area protected from change by the U.S. Government. it is concluded that. sedimentation will be a minor problem in the twol reservoirs. However, tests should be run and analysis made for sedimen.t in the final design of the reservoir. - i1 - ASPEN001054 ASPENOO1055 iv. WATER SUPPLY l. Genera} There is little doubt that Aspen is the ?Ski Center? of the world. Showmass-at-Aspen has assured a continued growth within its areas,as well as the intervening area. in addition to its winter a?tivity; great cultural activities in Aspen are bringing people from all over the County during the Summer. in order to show the areas involved in this study, a U.S. Geological map enlarged to a scale of i? 1000 feet has been prepared. The map is 4?v6? wide by long and the following features are shown thereon: (C) #0 foot Contour intervals and Sections; fownships and Ranges. Highways,-Roads and Streets. City of Aspen Airport and other improvements. Rivers and Streams. iTo these and other features, the foiiowing have been added: l. O?wat'rw Proposed Castle Creek Reservoir - 9.062 acre Feet capacity. Proposed Moreen Creek Reservoir - h,567 acre feet capacity. Existing Castle Creek Diversion Dam and Pipelines. Proposed Maroon Creek Diversion Dam and Existing Eastle Creek Filter'Plant and Treated Water Storage Proposed Maroon Creek Filter Plant and Treated Water Storage Proposed expansions of both Filter Plants I PropOSed Pipelines, Pumpino Station and Storage Reservoirs to serve entire Blue Line Area. Blue Line which boundaries the service area-0F the preposed Aspen Hetr0politan Water District. l2 ASPENOO1056 it should be pointed out that the Filter Plants, Storage Reservoirs, Pipelines and Pumping Stations will have to be enlatged from those shown on the map by the time ultimate development is reached, but because of the location of the water supply and contours of the ground, the ultimate devel~ opment wili follow those shown on the drawing. 2. Areas and Popylations The following is a tabulation of recorded subdivision plats as of July I, l968, that are shown on the drawing: PROJECTED NAME OF SUBDIVISION PLATTED LOTS POPULATION Meadowood SubdivisiOn MS l62 Sarwood Subdivision 70 252 Wolfson Subdivision l5 Brush Creek Village 339 l220 Helton Ranch Units 1,2,3 I39 I 500 Ridgerun Unit I 93 33Ll West Village 2 500 Woodrun Units i, 2 i3h #82 Wildoak Unit 3 lh . 50 Stapleton-Christensen 50 180 Ranches Burlingame Ranches Mi?g Total 940 3,875 - l3 ASPENOO1057 Platting of land in the area will continue at a rapid rate, Two large areas that are unplatted, but that are in the planning stage, are outiined on the drawing. Their names with acreages are as Follows: Stapleton-Christensen Ranches approximately l700 acres Airport~Burlingame Ranches approximately l033 acres Fifty lots in each of these ranches were shown in the above table in antici- pation of early platting of these ranches. The population of 3,875 shown in the above table should be reached by the end of 1970. Table No. l3 shows the areas within the Blue Line of the ASpen Hetropolitan Service area. The areas are given in each Section that fails within the Blue Line. The total of this area, excluding the Aspen area, is 26,695 acres. Not included in this area is some 6,h00 acres cailed the Aspen Area. The Aspen Area is defined on the map as bounded on the north and south by the lines marked ?indefinite Boundary? and on the west by Sections 3, l0 and l5 and on the east by the edge of the map. in December of 1964, the author prepared a report on water Supply for the City of ASpen, wherein he stated that the estimated population of the Aspen Area, bounded approximately as described above, as 30,000 people by 1990. The remaining area of 26,695 acres as shown in Tabie No, I3 is estimated to have at least half this amount bringing the population to 45,000 people by the year 1990. 3. WATER CONSUMPTION Table No.i3 shows a total area within the Blue Line of the ASpen MetrOpolitan Service Area of 33,095 acres; 6,h00 acres of which are in the ASpen Area. ASPENOO1058 The number of single family equivalent taps for this total area is as foliows: l6,000 taps l1 Aspen Area 6,000 acres 2 l/2 taps per acre ll Remaining Area 26,695 acres 3/9 taps per acre 20,000 taps Total 36,000 taps Total population 36,000 3.6 l30,000 peopie The general rule for raw water demand for each single family tap, as used by many water departments,is 1 acre foot per year or 325,800 gaiions per year per family, therefore the water supply for 36,000 taps or l30,000 people is 36,000 acre feet. The two storage reservoirs on Castle and HarOOn Creeks prOVide a storage of 9,062 6,569 14,629 acre feet. This would ieave a demand on direct flow on both streams of 36,000 - 10,629 21,37} acre feet. This is equivalent to a combined fiow of both streams of appr0ximateiy 30 cubic feet per second. It is only necessary to refer to Tabie No. ii to see that this amount of water is available from the combined streams. Table No. ll based on measured stream fiow shows that the lowest runoff of record was in l954 with a combined flow of 34,650 aere feet. This would meet the 36,000 acre feet demand because of a carryover of a full reservoir from 1953. The wettest year of record was l9i2 with a combined flow of 97,950 acre feet and in later 'years l957 with a combined flow of 95,550 acre feet. The flow of 30 cubic feet per second not be realized for short periods in dry years and this is why the reservoirs are needed to supplement this direct stream flow during these periods. l5 i .i i ASPEN001059 5 (gay . ASPENOO1060 - 9?Jn05 55'91 91'2 16'1 ih' 85'1 ?0?z 55'1 zS'l iZ?l 12'1 00'z 56' L96i 55'813 66's 9h?! Et'z 51': 0672 50'1 zotl tl'z 25? 51' 61' 3 996i 50'! 5961 hl'?z 11': 1652 13; 6945 9&?1 06'! 55': 91': 5 72 65'! 96'! 696! 1 25'wz 29-5 5673 in? 50'! 95-6 [6'1 52:2 5971 6 95'11 1071 68? 56% 86: 52:5 58' 6zrz 89: 09' 8 50:5 63'2 396: 01'! 53' l96l 28'91 21' ?8 987 ?07! 59' EST ?673 88'! 06'l 08'5 15'! ll'i 80' 96' 31': 16'! 6l'l 95': - 35': 66': z9' [l'h 28?3 Ev'i 096! oz'zz 56' ?97 02'5 6873 56'! Zi'l 95'2 in'z 50'2 hh'! 99?: 656: 33'21 56' SZTI 987 he'l 50'1 ?hf 6271 91'! 10?; 8561 66' 35': 50:; 96' 06?i 55* 58'! z6' on'z 59' 85' Oh'? ?561 96'61 65'l 56? 8h'! 55' 01' 997! 06'1 9S6l Oh?hl 65' 09'2 10'! 52' 10'2 59': 16' 12': 36' hZ'l ?l'l 69' 5561 60?51 53' Oh'l 60'2 (1'1 62' 26': 51': 91'! 90': 6561 Oh'l El'l 61' 16'! 61'! 21? og?l ?S'l 60'3 86' ll'i ?96: 06'91 59? 29'! 00' 06? 8&7: Ei'i 01' Sl'z ih'l hE'z 356i 96'62 5A'h 22': 00'3 82?1 91'z ll'i #1'1 59'! h?'1 19'! 19': 1561 NNV 330 AON 130 idBS SHV A1?f ENBF AVH 833 MVP BVHA ?961 - 156i 1v 11V3NIVH i -- 91 734 :9 2 9" - (3,4 gem 59:4 =99: (Nina?s 77:- 1.0032520? r: Oar-92 rc?ls?bffif2'75}; 9?90 gaitj WM . . . 9 3:9' 9-92,4999; 92V 6959M H.939. 93:99?99 .51. .91.- . Cg. #55 - 905? I .g M, :54 (.96 9.049 mo ANS 3.35:? 1399.26 H6 358-3929 In" M4 MO 910.? 9.1% {.055 3350 934.00 {.09 @6095. H0 910:? 0.993 0.98 - 3.334. {33.3% [02 #34103 - :9 9.045 9.03 1.00 0.95 3.0/5 I 3.0945 (3.350 I 9.03 :32ch I 20 904 90,3 0,95 0.92 0.955 3.3996 933.63 0.95 930.93 7f no.2? 0% 090 0.953 3.9.940. 33930 9.97 92:99:59 . 23 ,(00 0,953 0,94 {.04 0.990 3344 [33?6 0.9.9 ?73 I m??Iggr, sf? . I . . 96F. . - {.02 9.03 .907 {03 3.355 934.00 was 250.25 2 {.08 11.06 Hz 1.95 .910 . 3.355 {34.201156 65.2.4 . 3 {.19 9.35 9,42 (.33 . 3.34:5 134,60 (.5399 29.59.94 '4 9.20 {.02 (.04 we; 1.093, . 3.355 13400 {.125 #50753.360 954.40 9.20 Jay-aa- 7- 1.23 {.20 Ida-1,08 9.95" 3.360 34.40 933 965.3; 9'93 9.59 9.49-1.29125 9.4.0 - . 3.335 935.40 [69 224,75 I 9 9.441 1.367 "9.19 Ime- 9,29. . 3.375 93500 (4.77 199345 .39; A05 {03 (.049 3:35 - (34.00 9.09 :3 90? 9.049: {.04 97.02 5945, 3.345 93.3.59: 9.07 943.17 . . 9-9 9.0.8 -r.r2 9.31 9.95. 5936 1394.40 9.23 165.3}! '3 - :9 0.9.2 09.3: 0.96 03.9. 0,943 3.335 93.399: 0.999 . 96 0.97 0.95 to! 904 9.00 3.342 {3.1965 9.00 93.3% {7 {.03 (.02 [.08 (JO (.02: 3:35 1234,1351 ['09 {4605 .g . X6 112' {.ff - (US 3.35:; - 234.20 (.993 {563.36 I 19 (339 (3.64 0.59.235 . 3.33;: {3.30:3 0.504. {06:93 I. .20 0.435. 0.57 059: 093:9 as: 3-39:9. {32% @753 (091.5! I 3 0.6341085 09% 0.61 9:99.94 ?91325}? made. 0. 79:: 90.2.3.2" at: 9.62 0.9931 0.32 0.799 0999 .. ?93:99 .9532: I . pg; .3,an 0.33 ea; 0.75 051 3.577 93.365 09.939 .Q?li?a I {4 07% 0.753 0.77 0.75 Q77 339?4-1 {3.913924 0.529% (39.95.3 . 0.92 0.96 3.335 433.1: 0999 127.53? 1.94 9.43:3 0,73 5.65;: 3.340 133.60 .10: 437.49] - a; on; 0.73 0'76 0,74 3.21?; . .3393 932,32 came? affix; c999 - - - - . 940999 -- ?l E3 LO ASPENOO1062 DISCHARGE ACRE OF (1245 Tu: CREEK 1920 I W024ch 052?. No!) 235-5., Jon 452* Mogul/n.5- (79/3; [444.57. 65,515 7})259195 . V5625 ., -. - . .. 1' 119/2 3520 .2950 924.59 .7556 /44o!55o I550 654583529225000390 5770 <93 3600 2799 2540- x549 540 2.050 9925502292920 5550 53,10 9.2000 7.9/4 2550 244a 2490 2005/520 20cc 2259/0 99022360/6520 704:; 4090 77390 3296 2450 #550 #950 1599/590 355599009579 5459 3459515270 (9/6 2720 2/95 3039 1955 Ix59i