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Artificial Recharge of Ground Water in Colorado <br />A Statewide Assessment <br />Table IV -1. Comparisons of Artificial Recharge Technologies (Cont'd) <br />25 <br />Active <br />Technology <br />Description <br />Colorado <br />Advantages <br />Limitations <br />Aquifer Suitability <br />Examples <br />Subsurface Infiltration <br />0 Can be used where <br />• Higher initial capital <br />• Unconfined aquifers <br />(General comments apply <br />surface layers of low <br />costs <br />. Alluvium <br />to all technologies within <br />permeability preclude <br />. Limited aerial extent <br />. Semi - consolidated <br />this category) <br />surface infiltration <br />. Difficult to <br />sediments at outcrop <br />• Can co -exist with other <br />clean/maintain <br />. Highly fractured bedrock <br />surface urban uses such as <br />. Dependent upon near- <br />parking lots and <br />surface geology <br />recreation facilities <br />• Minimize evaporation <br />losses <br />➢ Infiltration Trenches <br />Perforated pipe embedded <br />None <br />Compatible with urban <br />in a gravel - filled ditch <br />land uses <br />➢ Infiltration Galleries <br />Similar to trenches except <br />None <br />0 Can cover larger areas <br />in arrays <br />➢ Dry Wells <br />Wells completed above <br />None <br />• Can be used where space <br />the water table <br />is limited <br />➢ Infiltration Pits /Shafts <br />Large diameter bore or <br />None <br />excavation to penetrate <br />near - surface low <br />permeability soils <br />25 <br />