precipitation (P) to the basin, including the Catskill and Croton catchments of the NYC municipal supply, is about 37.4 km3 yr-1 (Table 7.5).

Our estimate of mean annual discharge of the Hudson at the Battery (NYC), exclusive of inputs of wastewaters derived from NYC area water supplies, is 545 m3 s-1 (Hammond, 1975). Adding the contribution of the NYC supply from the Catskill and Croton drainage areas, total "natural" discharge at the Battery would be 18.3 km3 yr-1, resulting

Table 7.4. Descriptive data on New York City municipal water system

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