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The tables provide estimates of the curve number (CN) as a function of hydrologic soil group (HSG), cover type, treatment, hydrologic condition, antecedent runoff condition (ARC), and...
29 Φεβ 2024 · The objective of this step is to learn how to compute excess rainfall hyetograph from a total rainfall hyetograph using the Soil Conservation Service's (SCS) Curve Number (CN) method. This steps assumes that the user already has a total rainfall hyetograph in MS Excel.
8 Μαΐ 2015 · This is an Excel sheet that tabulates the SCS-CN curve number to simplify getting the values from the graph under normal, dry and wet conditions.
12 Αυγ 2019 · The CN look-up table was created based on the USDA Soil Conservation Service (SCS) Runoff Curve Number (CN) method 7.
1 Νοε 2013 · This spreadsheet is designed to calculate excess rainfall from total rainfall of a storm. The sheet need to provide CN curve number and storm distribution as cumulative rainfall over the time...
The model was developed to provide a consistent basis for estimating the amounts of runoff under varying land use and soil types (Rallison and Miller, 1981). The SCS curve number equation is (SCS, 1972): Qsurf=(Rday−Ia)2(Rday−Ia+S)Q_{surf}=\frac{(R_{day}-I_a)^2}{(R_{day}-I_a+S)}Qsurf =(Rday −Ia +S)(Rday −Ia )2 2:1.1.1.
While the TR-55 manual remains a most useful reference (it contains complete curve number tables and rainfall maps, among other things) most engineers have sought out more advanced or more accurate hydrology software. How to get it: You can download the TR-55 Manual here.
