Effective Rainfall and Irrigation Water Requirements

by David M. Hershfield,

Serial Information: Journal of the Irrigation and Drainage Division, 1964, Vol. 90, Issue 2, Pg. 33-50

Document Type: Journal Paper


Few studies have been made giving a comprehensive picture of effective rainfall and irrigation water requirements in the United States. The geographical distribution of effective-total rainfall ratios are displayed on two maps for two levels of consumptive use for 22 widely separated stations. This ratio, which varies from less than 50% to greater than 95%, is inversely related to rainfall magnitude during the growing season. One relationship in the form of a nomogram can be used to estimate the average growing-season effective rainfall from the parameters of seasonal total rainfall, seasonal consumptive use, and application amount. Another nomogram, using the same independent parameters, can be used to estimate the average amount and 10-yr return period amount of irrigation water required on a monthly basis.

Subject Headings: Rainfall | Seasonal variations | Irrigation water | Parameters (statistics) | Rain water | Mapping | Professional societies | United States

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