▁that ▁travel s ▁along ▁the ▁west ▁boundary ▁wall ▁from ▁Kir nie ▁Law ▁to ▁the ▁Twe ed ▁river . ▁ ▁Near by ▁Historic ▁Struct ures ▁ ▁Kir na ▁Burn ▁Water ▁T ank ▁ ▁A ▁for ▁sale ▁advert is ement ▁in ▁The ▁Sc ots man ▁published ▁on ▁April ▁ 1 5 , ▁ 1 8 7 1 ▁c ites ▁" an ▁abund ance ▁of ▁beautiful ▁spring ▁water " ▁to ▁The ▁Kir na . ▁It ▁is ▁likely ▁that ▁the ▁water ▁tank ▁position ed ▁up stream ▁from ▁The ▁Kir na ▁on ▁Kir na ▁Burn ▁provided ▁that ▁source ▁of ▁fresh ▁water ▁from ▁ 1 8 6 7 ▁until ▁at ▁least ▁ 1 9 6 1 ▁despite ▁local ▁authorities ▁being ▁required ▁by ▁law ▁to ▁provide ▁water ▁to ▁communities ▁from ▁the ▁ 1 9 4 0 s . ▁It ▁is ▁unclear ▁whether ▁this ▁particular ▁tank ▁function ed ▁as ▁an ▁int ake ▁or ▁a ▁storage ▁tank . ▁ ▁Kir nie ▁Law ▁Res er voir ▁ ▁The ▁Kir na ▁is ▁due ▁south ▁of ▁Kir nie ▁Law ▁Res er voir ▁which ▁was ▁built ▁to ▁provide ▁hydro - elect ric ▁power ▁for ▁Twe ed v ale ▁Mill ▁and ▁Twe ed holm ▁Mill ▁in ▁Walker burn , ▁owned ▁by ▁Henry ▁Ball ant y ne ▁& ▁S ons , ▁Ltd . ▁The ▁project ▁was ▁conce ived ▁of ▁and ▁designed ▁by ▁B oving ▁& ▁Co . ▁Ltd . ▁( h yd ra ul ic ▁engine ers ) ▁and ▁became ▁oper ational ▁in ▁ 1 9 2 2 . ▁This ▁was ▁the ▁first ▁working ▁hydro - elect ric