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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 />26 <br />Active <br />Technology <br />Description <br />Colorado <br />Advantages <br />Limitations <br />Aquifer Suitability <br />Examples <br />Direct Injection <br />a Work where vertical <br />a Require pre- treatment to <br />a Unconfined aquifers <br />(General comments apply <br />permeability is limited <br />drinking water standards <br />with limited surface <br />to all technologies within <br />a Occupy small surface <br />a Require tight control <br />exposure <br />this category) <br />areas <br />over source water quality <br />a Confined aquifers <br />a Can fit in with most <br />a High capital costs, when <br />a Deep alluvium <br />land -use patterns <br />existing infrastructure is <br />a Sedimentary bedrock <br />a Can utilize existing <br />not available <br />aquifers <br />water supply <br />a High energy <br />infrastructure <br />requirements, high O & <br />M costs <br />a Require frequent <br />pumping to remove <br />clogging <br />a Contamination from <br />recharge would be <br />difficult to remediate <br />➢ Injection Wells/ ASR <br />Wells that are either used <br />Centennial <br />a Can be used for deep <br />a All of above <br />Wells <br />solely for injecting water <br />Water District <br />aquifers <br />a Abandoned mines <br />(injection wells) or both <br />a Low capital costs, when <br />a Karst, caverns <br />injection and recovery (ASR <br />existing infrastructure is <br />wells) <br />available <br />➢ Radial Collection <br />Large diameter collector <br />None <br />a High infiltration rates <br />a High initial capital costs <br />a Unconsolidated <br />Wells (Raney Well) <br />well with horizontal radial <br />from a single point <br />aquifers <br />bores <br />➢ Horizontal Wells <br />Small diameter well that <br />None <br />a High infiltration rates <br />a High initial capital costs <br />a All of above <br />deviates from vertical to <br />from a single point <br />. Un- proven technology <br />horizontal with depth <br />26 <br />