Soil Conservation Service Curve Number (SCS-CN) Methodology by Surendra Kumar Mishra, Vijay P. Singh (auth.)

By Surendra Kumar Mishra, Vijay P. Singh (auth.)

The Soil Conservation provider (SCS) curve quantity (CN) process is without doubt one of the hottest tools for computing the runoff quantity from a rainstorm. it truly is renowned since it is easy, effortless to appreciate and practice, and solid, and money owed for many of the runoff generating watershed features, comparable to soil sort, land use, hydrologic situation, and antecedent moisture . The SCS-CN process used to be initially built for its use on small agricultural watersheds and has due to the fact been prolonged and utilized to rural, wooded area and concrete watersheds. because the inception of the tactic, it's been utilized to a variety of environments. lately, the tactic has acquired a lot awareness within the hydrologic literature. The SCS-CN approach used to be first released in 1956 in Section-4 of the nationwide Engineering instruction manual of Soil Conservation provider (now known as the common assets Conservation Service), U. S. division of Agriculture. The book has for the reason that been revised a number of instances. even if, the contents of the method were still kind of an identical. Being an enterprise method, the strategy has no longer gone through the method of a peer evaluate and is, typically, permitted within the shape it exists. regardless of numerous barriers of the tactic or even questionable credibility now and then, it's been in non-stop use for the easy cause that it really works quite good on the box level.

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I) Penman Method This method combines fundamental physical properties and empirical concepts based on standard meteorological observations. The physical principles include the energy-balance equation and the mass-transfer (or aerodynamic) equation. 31) Chapter 1 38 where E is the evaporation rate (em/day), En is the net evaporation rate (em/day), E. 66x10- 3 barsf'C). 32) where A is in mbf'C and T. is in °C. > -25 °C. 21 provides values of the Penman My-ratio for various temperatures. 33) where p is the density of water (grnlcm\ u is the latent heat of vaporization, depending on the temperature; and E is the rate of evaporation (em/day).

How water is actually held in the soil pores is of importance to understand the process of infiltration. 1 MECHANISM OFWATERRETENTIONBY SOIL The ability of soils to retain water is attributed to the presence of air-water interfaces similar to those in blotting papers or sponges. The surface tension acting at the air-water interface provides the mechanism for water retention. 19 on a level with the free water surface (<1> 2) and the hydrostatic pressure immediately below the interface (<1> 1) is equal to pgh, where p is the water density, g is the gravitational acceleration, and his the hydraulic head.

The (v) maximum rainfall for this period may or may not include the maximum rainfall of the previous smaller time period. Similar calculations are done for other durations. The depth-area calculations are made next. The isohyetal map of the lowest (vi) time interval is analyzed first. This map is divided into zones to represent principal rainfall centers. Beginning with the central isohyet (higher) value in each zone, the area encompassed by each isohyet is planimetered and then the net area between each pair of isohyets is determined.

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