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The S-curve stands for a direct runoff caused by the effective rainfall (ER) applied over an infinite time, and its intensity is one-unit depth per unit of time (e.g., 1 cm h\u22121). The S-curve is mainly used to alter a unit hydrograph (UH) of specified duration into a UH of desired duration.
TR-20 represents the full bore implementation of these methods, whereas TR-55 is a more simplified version that lent itself more to hand calculations. TR-55 was a simplified procedure that was used when engineers didn't have computers that could properly crunch the numbers for them. It was simplified from TR-20.
The Natural Resources Conservation Service (NRCS) uses hydrographs in the following ways: Watershed Evaluation. Hydrographs are used to determine the effects of proposed structures, land treatment or land use changes on peak discharges and volume of runoff.
The Soil Conservation Service (SCS) proposed a parametric UH model; this model is included in the program. The model is based upon averages of UH derived from gaged rainfall and runoff for a large number of small agricultural watersheds throughout the US.
The Soil Conservation Service (SCS) proposed a parametric UH model; this model is included in the program. The model is based upon averages of UH derived from gaged rainfall and runoff for a large number of small agricultural watersheds throughout the US.
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Technical Release No. 20: Computer Program for Project Formulation Hydrology (TR-20) is a physically based watershed scale runoff event model. It computes direct runoff and develops hydrographs resulting from any synthetic or natural rainstorm.
The Curve Number is a dimensionless parameter indicating the runoff response characteristic of a drainage basin. In the Curve Number Method, this parameter is related to land use, land treatment, hydrological condition, hydrological soil group, and antecedent soil moisture condition in the drainage basin.
TR-20 represents the full bore implementation of these methods, whereas TR-55 is a more simplified version that lent itself more to hand calculations. TR-55 was a simplified procedure that was used when engineers didn't have computers that could properly crunch the numbers for them. It was simplified from TR-20.
The curve number method in SWAT relates runoff to soil type, land use, and management. On the other hand, Green-Ampt (1911) is an infiltration. equation. It assumes a homogeneous soil profile and. antecedent soil moisture, total saturation above the wetting.
The SCS-CN method predicts runoff from an expression for a rainfall-runoff curve that varies according to a single parameter called the curve number (CN). The dimensionless CN parameter describes the antecedent potential water retention of a watershed [Hawkins, 2014].

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