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  2. Runoff curve number - Wikipedia

    en.wikipedia.org/wiki/Runoff_curve_number

    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 ...

  3. Runoff (hydrology) - Wikipedia

    en.wikipedia.org/wiki/Runoff_(hydrology)

    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 ...

  4. Infiltration (hydrology) - Wikipedia

    en.wikipedia.org/wiki/Infiltration_(hydrology)

    R is surface runoff. The only note on this method is one must be wise about which variables to use and which to omit, for doubles can easily be encountered. An easy example of double counting variables is when the evaporation, E, and the transpiration, T, are placed in the equation as well as the evapotranspiration, ET.

  5. Drainage density - Wikipedia

    en.wikipedia.org/wiki/Drainage_density

    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 ...

  6. Storm Water Management Model - Wikipedia

    en.wikipedia.org/wiki/Storm_Water_Management_Model

    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.

  7. Agricultural hydrology - Wikipedia

    en.wikipedia.org/wiki/Agricultural_hydrology

    Example of a surface water balance: An example is given of surface runoff according to the Curve number method. [3] The applicable equation is: Osu = (Rai – Ws) 2 / (Pp – Ws + Rm) where Rm is the maximum retention of the area for which the method is used Normally one finds that Ws = 0.2 Rm and the value of Rm depends on the soil ...

  8. Runoff model (reservoir) - Wikipedia

    en.wikipedia.org/wiki/Runoff_model_(reservoir)

    Figures 3 and 4 were made with the RainOff program, [8] designed to analyse rainfall and runoff using the non-linear reservoir model with a pre-reservoir. The program also contains an example of the hydrograph of an agricultural subsurface drainage system for which the value of A can be obtained from the system's characteristics. [9]

  9. Runoff - Wikipedia

    en.wikipedia.org/wiki/Runoff

    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