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<br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br />4.5 Special Modeling Functions Utilized <br /> <br />In addition to the basic channel routing functions incorporated into the UDSWM2-PC <br />model, special modeling functions are often required in the hydrologic model to simulate the more <br />intricate drainage systems. The UDSWM2-PC model incorporates the capability to simulate <br />detention storage facilities, flow diversions and exports from a basin, For the modeling efforts <br />associated with the Godding Hollow and Tri- Town Basins, the capability to simulate detention <br />storage facilities was utilized extensively. <br />The detention facilities simulated by the UDSWM2-PC model were general!y limited to <br />those facilities that were effective in reducing the peak associated with the lOO-year storm event <br />for existing conditions. As previously discussed in Chapter 3, the detention facilities evaluated <br />in conjunction with this master plan include five existing detention ponds located in the Godding <br />Hollow and Tri- Town Basins. At these locations, stage-storage-discharge relationships were <br />developed for each detention pond or system of ponds, The UDSWM2-PC model utilized these <br />relationships to determine the volume of stormwater detained in each pond and the corresponding <br />discharge that was released from the pond. <br />Several other detention facilities also exist within the Godding Hollow and Tri- Town <br />Basins; however, the effectiveness of some of these ponds in providing reduction of peak <br />discharges is limited to frequent storm events, Consequently, the smaller detention ponds were <br />excluded from the UDSWM2-PC master plan model. <br /> <br />4,6 Summary of Existing Conditions <br /> <br />4.6.1 Definition of Existing Conditions <br /> <br />The definition of existing condition includes all development that presently exists or was <br />approved for construction prior to March 1, 1999, All basin development after this date is <br />considered under the future conditions analysis, Results of the hydrologic analyses and mopeling <br />identified locations, at which major problems exist; these locations include areas of potential <br />flooding as wel! as locations where the storm drainage criteria, as defined in the next section, are <br />violated. <br /> <br />T:IOPEMCoweldOllcoweldOJ In! rpr.wpd <br /> <br />4,8 <br /> <br />Seprember 8, 1999 <br />