▁power ▁scheme ▁in ▁the ▁country . ▁The ▁res er voir ▁continued ▁in ▁use ▁until ▁around ▁ 1 9 5 0 . The ▁ferro - con crete ▁res er voir ▁is ▁still ▁substantial ly ▁int act . ▁Its ▁interior ▁measures ▁ 5 8 . 5 ▁meters ▁squ ared ▁by ▁ 4 . 7 ▁meters ▁deep ▁and ▁the ▁walls ▁are ▁ 2 0 ▁cent im eters ▁at ▁the ▁top ▁tap ering ▁to ▁ 3 5 ▁cent im eters ▁at ▁the ▁base . ▁The ▁tank ▁was ▁capable ▁of ▁holding ▁ 1 3 . 2 ▁million ▁lit ers ▁of ▁water . ▁There ▁is ▁a ▁sur ge ▁tank ▁( p ump ing ▁station ) ▁down hill ▁that ▁controlled ▁the ▁water ▁flow ▁to ▁the ▁tur b ines ▁in ▁the ▁valley . ▁ ▁Pre histor ic ▁En closure ▁Loc ated ▁approximately ▁ 2 7 0 ▁meters ▁N W ▁of ▁The ▁Kir na ▁is ▁a ▁pre histor ic ▁en closure ▁( sett lement ). ▁It ▁is ▁recorded ▁as ▁an ▁' anci ent ▁monument ▁forming ▁part ▁of ▁the ▁lands ▁of ▁Cab er ston ' ▁under ▁the ▁An cient ▁Mon uments ▁Act , ▁ 1 9 3 1 . ▁The ▁settlement ▁has ▁been ▁mostly ▁destroyed ▁by ▁cultiv ation , ▁stone - ro bb ing , ▁and ▁the ▁construction ▁of ▁a ▁semi - circ ular ▁sheep fold , ▁now ▁in ▁ru ins . ▁However , ▁sufficient ▁remains ▁to ▁show ▁that ▁it ▁measured ▁about ▁ 5 0 ▁meters ▁N - S ▁by ▁slightly ▁less ▁trans vers ely , ▁and ▁that ▁it ▁was ▁originally ▁en closed