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<br />2. Urban Drainage Storm Water Management Model (UDSWM2-PC) for <br />routing of flow through the basins. <br /> <br />The following three planning scenarios were simulated in the master plan by these <br />two computer models: <br /> <br />1. Existing condition hydrology with existing facilities. <br /> <br />2. Future development condition hydrology with existing facilities. <br /> <br />3. Future development condition hydrology with on-site detention and <br />proposed improvements. <br /> <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 /> <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 <:vent, for those <br />basins draining into the proposed regional detention pond south of Frederick, are <br />summarized in the following table: <br /> <br />on n umg y ro ogy <br />Basin Number Existing Condi <br /> Hydr <br />61 307 <br />62 418 <br />63 372 <br />89 291 <br />90 776 <br />91 741 <br />92 145 <br />93 116 <br />94 35 <br /> <br />C t'b r H d I <br /> <br />to the R <br /> <br />IDt r P <br /> <br />cfs <br /> <br />eglOna {: en IOn 011( <br />lOO Year Future Condition 100 Year <br /> Hydrology <br /> 13 cfs <br /> 292 cfs <br />--- f-- <br /> 34 cfs <br /> 78 cfs <br />--- f-- <br /> 126 cfs <br /> 634 cfs <br /> 26 cfs <br /> 57 cfs <br /> 16 cfs <br /> <br />tion <br />ology <br /> <br />cfs <br /> <br />cfs <br /> <br />cfs <br /> <br />cfs <br /> <br />cfs <br /> <br />cfs <br /> <br />cfs <br /> <br />cfs <br /> <br />II <br />