Show runoff run off after rainfall a affects affect water N paver 7 e r in the tha study of the tha matter of of maln 1 D fall it has been gradually realized that the runoff run off calls for just as much investigation as the precipitation in fact it has been found that the runoff run off Is even more variable than the rainfall the runoff run off Is that part of 0 rainfall which finds its way to the streams and Is available for gen generating cratIng hydro electrical power this runoff run off uno Is not a fixed percentage when the ground la Is very dry it absorbs all the rainfall end and there la Is no runoff run off when tho the earth Is saturated practically every dr drop op of rainfall runs off thus when a L drought strikes an area usually well watered the drop in runoff run rua off Is much more pronounced than the shrinkage in precipitation all of this has been known in a general way but it has taken a prolonged dry spell to make it really appreciated and water power plants that were planned from rainfall records without proper allowance for the still greater fluctuations la in runoff run off have suffered buffered the recognition ot of this relationship will undoubtedly save the industry many millions of dollars in unprofitable Invests ments and will safeguard tle alic consumer be because caliSe of greater re gerves that will be provided bere hereafter after |