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RICHARD D. LAMM <br />Governor <br />MEMORANDUM <br />~ ~ ~~o~ ~ <br />~~ <br />C O <br />m•; '~.0 <br />igre <br />DIVISION OF WATER RESOURCES <br />Department of Natural Resources <br />1313 Sherman Street -Room 818 <br />Denver, Colorado 80203 <br />Administration (303) 8923581 <br />Ground Water 13031892-3587 <br />March 10, 1978 <br />III IIIIIIIIIIIII III <br />999 <br />C.J. KUIPER <br />State Engineer <br />REC~I~~® <br />MAR 1 3 1978 <br />MINED LAND RECLAMATION <br />Colo. Dept. of Natural Resources <br />TO: HARRIS SHERMAN, SECRETARY, MINED LAND RECLAMATION BOARD <br />FROM: DR. JERIS A. DANIELSON, DEPUTY STATE ENGINEER <br />SUBJECT: DURHAM SAND & GRAVEL COMPANY, WELD COUNTY, APPLICATION <br />FOR MINING AND RECLAMATION PERMIT <br />As requested by your office, we have reviewed the application for a gravel pit <br />near Greeley. Section D, page 4a, states that "based on data in Water Court <br />Case W-8283-76...annual evaporation of water...is estimated to be 29 inches <br />per year" and that "precipitation...averages 11 inches per year; thus, a lake <br />created in the proposed mining area would have a net loss of 18 inches of water <br />per year" . These calculations are in error as the 29 inches in W-8283 is net <br />evaporation after precipitation has been subtracted. This error negates the <br />statement on page 4b that "in view of the fact that original natural use and crop <br />use is the same and in many cases exceeds the estimated 18 inches net loss of <br />water anticipated by turning the mining area into a lake...it is safe to assume <br />that there is no need for water augmentation" . In fact, the applicant must aug- <br />ment the difference between historic consumptive use and net evaporation, or <br />11 inches per acre of lake surface per year. This means that 118 acre-feet per <br />year of augmentation water may have to be provided to prevent injury to water <br />rights along the Cache la Poudre and South Platte Rivers assuming a year around <br />call for water. We cannot recommend approval of this application until the appli- <br />cant provides an augmentation plan capable of providing this amount of water. <br />JAD/SSH:mvf <br />Je 's A. Danielson <br />cc: W. G. Wilkinson, Div. Eng. <br />Central Colorado Water Conservancy District <br />Lower South Platte Water Conservancy District <br /> <br />Irrigationists Association <br />Weld County Planning Comm. <br />