Central Water and Power Research Station, Poona.
Ekruk Tank has been estimated to have suffered a loss of its planned pondage capacity by more than a thousand m.cu.ft. by silting of the basin during the last 95 years. In order to enable the reduced storages of the tank hold out warranty for 32 months supplies to the City, a rule was formulated a few years back not to spare the waters below gauge level 37 ft. (11.3 m.) for irrigation. Analysis of relevant data has shown the warranty as incapable of fulfilment on account of the larger consequential evaporation losses, etc. The data also show the very remote likelihood of two lean replenishments occurring in close succession one after another.
For the revised premise accordingly postulated of warranting only 20½ months City supply requirements, the reduced contents below gauge level 32 ft. (9.7 m.) also are shown to be tolerably sufficient. Apart from thereby cutting down on the heavy evaporation losses, additional quant-ums of more than 700 m.cu.ft. will have been made available year after year for irrigational use, whenever the annual replenishments may exceed 900 m.cu.ft. as they normally do in nearly 80 per cent cases.
