▁completed ▁after ▁twelve ▁months ▁on ▁August ▁ 2 1 , ▁ 2 0 1 0 . ▁S ynchron ised ▁with ▁the ▁progress ▁of ▁exc av ation , ▁the ▁inner ▁walls ▁of ▁the ▁tunnel ▁were ▁l ined ▁with ▁ ▁thick ▁pre cast ▁concrete ▁hex ag ons . ▁The ▁average ▁daily ▁progress ▁of ▁the ▁exc av ation ▁works ▁was ▁between ▁. ▁The ▁water ▁tunnel ▁has ▁an ▁average ▁down hill ▁slope ▁of ▁ 0 . 4 9 % ▁through ▁the ▁Gaz ient ep ▁Form ation ▁of ▁the ▁E oc ene ▁and ▁O lig oc ene ▁ge ological ▁period . ▁ ▁Econom ics ▁The ▁construction ▁cost ▁about ▁ 2   b ill ion . ▁As ▁part ▁of ▁the ▁S out he astern ▁An atol ia ▁Project , ▁it ▁supplies ▁water ▁to ▁agricult ural ▁land ▁covering ▁an ▁area ▁of ▁about ▁ ▁in ▁Sur u ç ▁Valley ▁and ▁to ▁ 1 3 4 ▁populated ▁places ▁in ▁and ▁around ▁Sur u ç . ▁With ▁its ▁inner ▁diameter ▁of ▁ ▁, ▁the ▁water ▁tunnel ▁has ▁a ▁dis charge ▁capacity ▁of ▁, ▁which ▁makes ▁it ▁bigger ▁than ▁many ▁rivers ▁in ▁Turkey . ▁It ▁is ▁expected ▁that ▁the ▁project ▁will ▁create ▁jobs ▁for ▁at ▁least ▁ 1 9 0 , 0 0 0 ▁people ▁in ▁the ▁region . ▁With ▁ir rig ation ▁by ▁the ▁Sur u ç ▁Water ▁T unnel , ▁over ▁ 8 , 0 0 0 ▁far mers ▁will ▁be ▁able ▁to ▁produce ▁more ▁prof itable ▁agricult ural ▁product . ▁Ministry ▁of ▁Forest ▁and ▁Water ▁Management ▁Ve ys el ▁E ro