Storage to be Provided in Impounding Municipal Water Supply

There is undoubtedly a definite relation between the storage provided in an impounding reservoir · on any stream and the quantity of water which can be supplied continuously by it. The relation, however, is a complex one, and our knowledge of its character is limited. The following study is made to see how far it may be possible to separate this complex relation into parts, some of them being of such a nature that they may be studied separately with definite results, and afterward to treat all the remaining variations on the basis of probabilities, using all data from a number of different streams; and to study them in comparison with the normal law of error.