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<br />-_.......~------.................,........,.,..................,...,.............~........,.,.................. <br /> <br />Artificial Recharge of Ground Water in Colorado <br />A Statewide Assessment <br /> <br />Table IV-I. Comparisons of Artificial Recharge Technologies (Co nt' d) <br /> <br /> Active <br />Technology Description Colorado Advantages Limitations Aquifer Suitability <br /> Examples <br />Other <br />Detention Dams, Dikes Engineered structures in the Indian Hills . Low 0 & M costs . Very site specific . Unconfined aquifers <br />and Weirs channel of a stream to catch . Environmental with surface exposure <br /> natural flow and enhance concerns . Alluvium <br /> natural recharge . Semi-consolidated <br /> sediments at outcrop <br /> . Highly fractured <br /> bedrock <br />Ground-Water Darns Structures in the aquifer that . Do not necessarily . Site specific and limited . Unconfined aquifers <br /> intercept or obstruct natural require outside source to shallow aquifers with with surface exposure <br /> ground-water flow of water small cross-sectional . Alluvium <br /> . Low 0 & M costs areas. <br /> . Low evaporation losses . High construction costs <br /> for larger, deeper <br /> aquifers. <br />Adits/Shafts/Natural Allow water to flow into Leyden Coal . High recharge rates . Vulnerability to . Abandoned coal and <br />Openings cavern or mine using open Mine contamination metal mines, caverns <br /> shaft . Site specific . Karst <br /> . Caverns <br /> <br />27 <br />