Definition:
1.In general, rain that produces runoff.
2.In irrigation practice, that portion of the total precipitation which is retained by the soil so that it is available for use for crop production.
3.In geohydrology, that part of the total precipitation that reaches the groundwater. Not all dependable rainfall is effective and some may be lost through surface runoff, deep percolation or evaporation.
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Source:
Food and Agriculture Organization of the United Nations, AQUASTAT Web Site
FAO/IPTRID/ICID/ODA, 2000, Irrigation Guidelines, Land and Water Digital Media Series 12, & FAO, 2000, Handbook on Pressurized Irrigation Techniques