in my opinion a pond size ...
Published by balbir singh, researcher on water for agricultural irrigation
in my opinion a pond size 200x200x3feet deep located at the lower level of the farm into which all the rainwater is directed & lined at the bottom with LDPE PLASTIC SHEET with bushes around it to reduce wind evaporation can irrigate a 2-3 acre farm during the dry season for quick growing crops which require less water