▁land l ords ▁lost ▁their ▁motiv ation ▁for ▁invest ing ▁more ▁money ▁in ▁construct ing ▁or ▁repair ing ▁the ▁q an ats ▁which ▁were ▁subject ▁to ▁the ▁L nd ▁Reform ▁Law . ▁On ▁the ▁other ▁hand , ▁the ▁pe as ants ▁could ▁not ▁come ▁up ▁with ▁the ▁money ▁to ▁maintain ▁the ▁q an ats , ▁so ▁many ▁q an ats ▁were ▁gradually ▁abandoned . ▁The ▁introduction ▁of ▁modern ▁devices , ▁that ▁made ▁it ▁possible ▁to ▁dr ill ▁many ▁deep ▁well s ▁and ▁extract ▁ground water ▁much ▁more ▁quickly , ▁acceler ated ▁the ▁q an ats ’ ▁destruction . ▁The ▁p ump ed ▁well s ▁had ▁a ▁negative ▁impact ▁on ▁the ▁q an ats ▁due ▁to ▁their ▁over exp lo itation ▁of ▁the ▁ground water . ▁These ▁changes , ▁that ▁occurred ▁in ▁Moh amm ad ▁Re za ▁Shah ' s ▁reign , ▁inf lic ted ▁great ▁damage ▁on ▁the ▁q an ats ▁of ▁the ▁country ▁so ▁that ▁many ▁q an ats ▁van ished ▁forever . ▁The ▁statistics ▁related ▁to ▁ 1 4 , 7 7 8 ▁q an ats ▁estimates ▁the ▁overall ▁dis charge ▁of ▁these ▁q an ats ▁to ▁be ▁ 6 . 2 ▁billion ▁cub ic ▁meters ▁per ▁year ▁between ▁the ▁years ▁ 1 9 7 2 ▁and ▁ 1 9 7 3 . ▁If ▁we ▁assume ▁the ▁total ▁number ▁of ▁the ▁q an ats ▁at ▁that ▁time ▁to ▁be ▁ 3 2 , 0 0 0 , ▁their ▁annual ▁dis charge ▁would ▁have ▁amount ed ▁to ▁ 1 2 ▁billion ▁cub