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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 ...
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.
Author: NSSC: Short title: Software used: Acrobat PDFMaker 8.1 for Excel: File change date and time: 02:28, 22 January 2009: Date and time of digitizing: 05:22, 9 January 2009
An intensity-duration-frequency curve (IDF curve) is a mathematical function that relates the intensity of an event (e.g. rainfall) with its duration and frequency of occurrence. [1] Frequency is the inverse of the probability of occurrence. These curves are commonly used in hydrology for flood forecasting and civil engineering for urban ...
Runoff curve number is within the scope of WikiProject Soil, which collaborates on Soil and related articles on Wikipedia. If you would like to participate, ...
For a natural number n, the graph of = is a curve with peaks and valleys, all of whichare tangent to 0 and 1. Thus, the number of intersections between the diagonal and the graph is 2 n {\displaystyle 2^{n}} , and there are 2 n {\displaystyle 2^{n}} fixed points of f n ( x ) {\displaystyle f^{n}(x)} .
Annex 4 is a soil description sheet. It is a separate document in the form of an excel file to fill in the surveyed field characteristics. Annex 5 provides a guidance for database set-up (not yet published). Annex 6 suggests colours in maps showing the RSGs.
It is proportional to the number of elements in the chart and is given by 1/N, N being the total number of elements in the chart. For example, a typical chart consists of 200 elements; therefore, the influence value is 0.005. [1] The procedure for obtaining the vertical pressure at any point below a loaded area is as follows: