▁a ▁storage ▁volume ▁of ▁almost ▁ 5 0 0 ▁million ▁cub ic ▁meters . ▁It ▁is ▁a ▁chief ▁source ▁of ▁fresh ▁water ▁for ▁the ▁city ▁of ▁Dak ar , ▁hundreds ▁of ▁kilom eters ▁to ▁the ▁south - west , ▁through ▁under ground ▁pip es . ▁While ▁the ▁water ▁of ▁the ▁Sen eg al ▁River ▁is ▁abund ant , ▁water ▁in ▁most ▁of ▁the ▁rest ▁of ▁the ▁country ▁is ▁scar ce . ▁Other ▁major ▁surface ▁water ▁bodies ▁include ▁the ▁Cas am ance ▁River , ▁the ▁G amb ia ▁River , ▁the ▁Sal ou m ▁River , ▁the ▁Geb a ▁River , ▁the ▁Fal ém é ▁River ▁and ▁the ▁Tam na ▁l ago on ▁near ▁Th i ès . ▁ ▁Sen eg al ▁has ▁about ▁ 3 ▁billion ▁cub ic ▁meters ▁per ▁year ▁of ▁renew able ▁ground water ▁resources , ▁ex cluding ▁those ▁ground water ▁resources ▁that ▁overlap ▁with ▁surface ▁water . ▁Total ▁water ▁withdraw als ▁in ▁ 1 9 8 7 ▁were ▁ 1 . 4 ▁billion ▁cub ic ▁meter , ▁of ▁which ▁ 9 2 % ▁is ▁for ▁agricult ure , ▁ 3 % ▁for ▁industry ▁and ▁ 5 % ▁for ▁domestic ▁uses . ▁Gr ound water ▁res erves ▁include ▁shall ow ▁aqu if ers ▁which ▁are ▁ 0 – 2 0 ▁m ▁deep ▁in ▁the ▁Cas am ance ▁and ▁ ▁deep ▁in ▁Ka ol ack ▁and ▁Tamb a , ▁as ▁well ▁as ▁c rop - outs ▁in ▁the ▁area ▁of ▁Dak ar ▁and ▁Th i ès . ▁They ▁also ▁include ▁deep ▁aqu