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The runoff curve number (also called a curve number or simply CN) is an empirical parameter used in hydrology for predicting direct runoff or infiltration from rainfall excess. [1] The curve number method was developed by the USDA Natural Resources Conservation Service , which was formerly called the Soil Conservation Service or SCS — the ...
The only note on using this formula is that one must assume that , the water head or the depth of ponded water above the surface, is negligible. Using the infiltration volume from this equation one may then substitute F {\displaystyle F} into the corresponding infiltration rate equation below to find the instantaneous infiltration rate at the ...
The runoff curve number (also called a curve number or simply CN) is an empirical parameter used in hydrology for predicting direct runoff or infiltration from rainfall excess. [13] The curve number method was developed by the USDA Natural Resources Conservation Service , which was formerly called the Soil Conservation Service or SCS — the ...
This approach is adopted from the NRCS (SCS) curve number method for estimating runoff. It assumes that the total infiltration capacity of a soil can be found from the soil's tabulated curve number. During a rain event this capacity is depleted as a function of cumulative rainfall and remaining capacity.
A runoff models or rainfall-runoff model describes how rainfall is converted into runoff in a drainage basin (catchment area or watershed). More precisely, it produces a surface runoff hydrograph in response to a rainfall event, represented by and input as a hyetograph. Rainfall-runoff models need to be calibrated before they can be used.
Horton (1945) used the following equation to describe the average length of overland flow as a function of drainage density: [2] l O = 1 2 D d {\displaystyle l_{O}={\frac {1}{2D_{d}}}} Where l 0 {\displaystyle l_{0}} is the length of overland flow with units of length and D d {\displaystyle D_{d}} is the drainage density of the catchment ...
Runoff model (reservoir), a mathematical model involving rainfall and runoff; Runoff curve number, an empirical parameter used in hydrology; RUNOFF, the first computer text-formatting program; Runoff or run-off, another name for bleed, printing that lies beyond the edges to which a printed sheet is trimmed; Runoff or run-off, a stock market term
A stream hydrograph is commonly determining the influence of different hydrologic processes on discharge from the subject catchment. Because the timing, magnitude, and duration of groundwater return flow differs so greatly from that of direct runoff, separating and understanding the influence of these distinct processes is key to analyzing and simulating the likely hydrologic effects of ...