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4~ <br />~ ~ ~ Ill lllll!llllllllll ' <br />Leonar~' Rice Consulting Water Engin~~rs, Inc. HerpldrFRBishop <br />(303) 455-9589 / 2785 North Speer Boulevard /Denver, Colorado 80211 <br />February 13, 1976 <br />Mr. Jack Haines <br />9419 Newton <br />Westminster, Colorado. <br />®®~~°° ~p OFFICES IN <br />11G~~1 Y ~® Granby, Colorado <br />NOV -41977 <br />Dear Mr. Haines: MINED LAND RECLAMATION <br />Colo. Dept. of Natural Resources <br />In accordance with our agreement we submit this reporr of <br />the results of our investigation into the water plans <br />related ~~the IiilJroe-Atchison Construction and Paving <br />Company's gravel mine near Henderson. <br />AREA WATER RESOURCES <br />The mining site as shown in Figure 1 is located uartly in <br />and adjacent to the floodplain of the South Platte River <br />in Section 26, T.I.S., R.67.W. in Adams County, Colorado. <br />In this area the South Platte River is a sand bedded channel <br />meandering within an alluvial floodplain approximate~y 2 <br />miles wide. The alluvium c~ rains st~llow gr~wid water that <br />is hydraulically connected to the surface stream system. <br />Flow in the South Platte River is derived from snow melt in <br />the high mountains augmented by West 31opc~ water imported <br />for municipal us. in the Denver Metropolitan area. Prior <br />to development o£ irrigated farming in the South Platte <br />River Basin, the lower reaches of the river were dry for <br />various periods of time. The appropriation of water for <br />irrigation, a portion of which returns to the stream system, <br />and the impo_tation of water from Western Colorado have <br />resulted in a more stable base flow during periods of low <br />flow. In recent years, especially since low cost electric <br />power has become widely available, there has been a sharp <br />rise in the number of pumped wells used for irrigation and <br />other purposes. These wells tend to lower the shallow <br />ground water table dur` the irrigation season and provide <br />ground water storage which can be recharged during the spring <br />runoff period. <br />Ground water in the area is available from the alluvium c. <br />shallow depths and is hydraulically connected to '!e surface <br />stream system and as such is considex.3 tributary and sub- <br />ject to administration under the appropriation doctrine. <br />Deep wells in the area could withdraw ground water from a <br />variety of formations. Ground water in the derma^r formations <br />is not hydraulically connected to the surface stream systr=.., <br />and therefore is considered non-tributary. Shallow ground <br />water in the area is continuously flowing slowly downstream <br />through the sands and gravels ^° the floodplain deposits. <br />I-: 9Y - <br />Water Rights <br />Environmental Analysis <br />Urban Drainage <br />