Artifical Recharge of Ground Water in Colorado

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INJECTION/ "ASR" WELL Ground surface Recharge supply` pipeline —► (Treated drinking water) Injection supply line- Vadose Zone Watery table o•n'n� V r :C Injection pipe Artificial Recharge of Ground Water in Colorado A Statewide Assessment Pump discharge to system ► —Well casing (6 " -18" diameter) —Grout seal —Pump Column jGround Water 4'� Mounds 0 �•77��:: Va o: 0 Filter pack CJ•. Q p• D,X' ell screen ( (�'�.%1'•'i, Y•�_o• .%1'c1� RADIAL WELL - — Cover Recharge supply pipeline t— Reinforced concrete caisson (6-12' diameter) •Q "— �. c A U Uo::Ua: `:::o;�" ^�'iI' ^'•':U.b: ::o;o :U :o:'V b•.. "(Po" U.b o;o"'-:U:o :'().b: oo`' :U:o: b:.. off. :o:':U:b :- 0 4 0.:•�'.6•.•Aquifer D o.:,�:o.•:A:� b. 0. o o.•.rJ. o•o.•:A:�: %•.Q..o.:•� o .A•� o: o::•� A'. :o.:O..q 0,9 Ob ; :0 p O, • 0 JQ • .0: p O •00'� 0�. O' �0 fl OQ ;'•O p :O, 00 fl OQ .0: p O• :; Op p 0 .011:0.::1 6F, Q:�' Horizontal screen pipes Q�a�•Q p •�Q �. • 'Pump o paflQ p' ;'�Q �o 'n• �,Q/l�Q• .��1 :p'::•:� o0aa 11 a o •� a ,o n�, ':0-- 1111 �,.:o o a C). °Ud•:00 ° o�0 0 Ud 0.0 o.Ot� 0 0• 4� 00 0 4 0 �� 0 0, :0 �p v.�• , •�;nro�.- .6 Oo:O�o'. aq. 0000:0: o:o:nO aq 000Qo w' a q o:c O;p D O O, • �; (J O O • °' O� � D ° O.O• 0.� O O O, ^ 0 p; p' O {Screen pipes arranged; Base of �•'• '� �' n O" in radial atternl Aquifer o ••, p�.• " �• .� q Impermeable Bedrock . I I Figure IV -3. Direct injection in an unconfined aquifer. Water for recharge is injected through a well directly into the saturated aquifer raising the water table in a conical mound around the well. The well can also be used for recovery of the injected water as an ASR well. Injection can use a dedicated injection pipe or the pump column equipped with a down -hole flow control valve. A radial well increases the radius of influence of the well through a series of horizontal feeder screened pipes arranged in a radial pattern around the well. 20