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Climate, soil, and vegetation: 5. A derived distribution of storm surface runoff
Author(s) -
Eagleson Peter S.
Publication year - 1978
Publication title -
water resources research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.863
H-Index - 217
eISSN - 1944-7973
pISSN - 0043-1397
DOI - 10.1029/wr014i005p00741
Subject(s) - surface runoff , storm , environmental science , hydrology (agriculture) , infiltration (hvac) , runoff curve number , intensity (physics) , runoff model , flood myth , probability density function , water content , soil science , atmospheric sciences , meteorology , mathematics , geology , statistics , geotechnical engineering , geography , biology , ecology , physics , archaeology , quantum mechanics
The Philip infiltration equation is integrated over the duration of a rainstorm of uniform intensity to give the depth of point surface runoff from such an event on a natural surface in terms of random variables defining the initial soil moisture, the rainfall intensity, and the storm duration. In a zeroth‐order approximation the initial soil moisture is fixed at its climatic space and time average, whereupon by using exponential probability density functions for storm intensity and duration, the probability density function of point storm rainfall excess is derived. This distribution is used to define the annual average depth of point surface runoff and to derive the flood volume frequency relation, both in terms of a set of physically meaningful climate‐soil parameters.