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<br />If, in sealing the dam face the seepage decreased to a minimal condition, <br />then the downstream sand would not be needed. This assumption would be borne <br />out by flow monitoring. Under a good face sealing program the seepage flow <br />lines would lower considerably reducing the downstream piping; increasing the <br />consolidation of the dam and its stability to the shear sliding. This altemate <br />would reduce the costs to about $59,000 construction costs. <br /> <br />If the storage facility is breached and not used for water impoundment, <br />the costs would be about $25,000 to eliminate the storage. <br /> <br />The spillway requires lowering the water surface by two f~et for a loss <br />of about 35 acre feet of storage. This lowering adds to the stability of the dam. <br /> <br />The 10ss of 35 acre feet represents about $5,700 per year of potential <br />water sales at $. so per 1,000 gallons. The loss of the total facility would be <br />about 155 acre feet of storage that the City must put a dollar value on for its <br />long term needs if the storage is breached and out of service. The water sales <br />of $5,700 would be non-recoverable in lowering the spillway for dam safety. <br />In terms of population, one (1) acre-foot of storage will supply ten (10) people <br />for one year. The total storage of 155 acre-feet then is equivalent to 1,550 <br />population needs for one year; assuming no recharge. <br /> <br />The water rights on Chicago Creek are: <br /> <br />Miners Ditch <br />James Allan Water Power <br />Idaho S;:rings <br />Burns-Moore <br /> <br />U. S. Flume & Pipeline <br />Little Mattie <br /> <br />10/9/1914 <br /> <br />10/9/1914 <br /> <br />10/9/1914 <br />10/9/1914 <br />10/9/1914 <br /> <br />10/9/1914 <br /> <br />32 sec. ft. <br />20 sec. ft. <br />3 sec. ft. <br />81. 08 sec. ft. <br />4 1. 1 sec. ft. <br />49.35 sec. ft. <br /> <br />For Idaho Springs the 3 sec. ft. amounts to 1,944,000 gallons per day, <br />sufficient to support a population of 19,440 based on non-drought years, usage, <br />etc. The 3 sec. ft. is equal to 5.9 acre-feet per day which could fill the 155 <br />acre-feet storage in about 26 days. <br /> <br />The previous discussions lead to the fact that the storage facility is <br />a tremendous asset to Idaho Springs if properly utilized by water saIes. If <br />the 35 acre-feet could generate $5,700 per year then the spillway should not <br />be lowered the two feet but made longer. The dollar water sales revenue to be <br />used to pay for the added length needed which would double the spillway costs. <br />The spillway costs of $20,000 could be repaid in about four (4) years. <br /> <br />IV - 2 <br />