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' <br />' <br /> L <br />' <br /> LJ <br />� <br />2. Urban Drainage Storm Water Management Model (UDSWM2-PC) for <br />routing of flow through the basins. <br />The following three planning scenarios were simulated in the master plan by these <br />two computer models: <br />1 <br />2. <br />3 <br />Existing condition hydrology with existing facilities. <br />Future development condition hydrology with existing facilities. <br />Future development condition hydrology with on-site detention and <br />proposed improvements. <br />' The rainfall design storms used in the hydrologic analysis of the Tri-Town Basin <br />were based on information presented in the Precipitation Frequency Atlas of the <br />Western United States, NOAA Atlas 2, Volume III, Colorado, dated 1973. The <br />' one-hour rainfall values obtained from the NOAA Atlas were utilized to develop <br />a three hour design storm for use in the CUHP computer model. <br />' Figure 4 on the following page shows the various subbasins developed by Anderson <br />Consulting Engineers, Inc. for computer modeling purposes. Hydrology results <br />by Anderson Consulting Engineering Inc. for the 100 year storm event, for those <br />, basins draining into the proposed regional detention pond south of Frederick, are <br />summarized in the following table: <br />' <br />Contributin Hydrolo to the Re ional Detention Pond <br />Basin Number Existing Condition 100 Year Future Condition 100 Year <br />Hydrology Hydrology <br />61 307 cfs 13 cfs <br />62 418 cfs 292 cfs <br />63 372 cfs 34 cfs <br />89 291 cfs 78 cfs <br />90 776 cfs 126 cfs <br />91 741 cfs 634 cfs <br />92 145 cfs 26 cfs <br />93 116 cfs 57 cfs <br />94 35 cfs 16 cfs <br />11 <br />' <br />