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• total required volume. SURVCADD was then used to design ponds in each location which <br />had the parameters described in the previous section. All ponds were designed to fully <br />contain the 25 year 24 hour event except Pond OiO, which was designed to safely pass the <br />25 year event through the emergency spillway. <br />Shown on the following two pages are the calculations used by the SURVCADD Program in <br />determining typical pond volumes. <br />Universal Soil Loss Equation :Use in Survcadd Program <br />Required User Input <br />Note :The following values are to be entered by the user for each area in the watershed. <br />The method for obtaining these parameters is left to the user. <br />Rainfall Factor (R) :Default = 50; <br />Erodability Factor (K) :Default = 0.37 <br />• C Factor (C) :Default = 0.5 <br />P Factor (P) :Default = 1.0 <br />Geometric Information <br />Area (sq units) :Can be entered by the user or the program calculates the area of a <br />user-selected closed polyline. The user also has the option to enter the area indifferent <br />units. <br />Slope, S (%) :Can be entered by the user or the program calculates the slope when the user <br />selects an area from the screen. <br />Length (L) :Can be entered by the user. If the user selects an area from the screen, the <br />length is not calculated since the Gross Erosion is directly calculated. <br />Topographical Factor (Ls) :Will be calculated from Length (L) and the Slope (S), only when <br />these values are entered by the user directly, as against calculatedby the program from the <br />screen. In the second case, the value of Ls is calculated for individual grids and not for the <br />• entire area. <br />(Revised Judy zoosl 2.05.3(3)-23 <br />