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� Sca�cay�I�ratl I Lot � <br /> Slnnn I hain:r�c Rcporl <br /> � 6 Hydraulic Calculafiions <br /> Hydraulic grade line calculations were performed using the computer rnodeling <br /> isoftware StormCAD. The StormCAD program sums the flows tribulary to each <br /> reach (pipe) and then performs a direct step backwater analysis on the network. <br /> IFor further background on StormCAD please refer to the Appendix. <br /> IThe hydraulic grade line calculation was computed using the 100-year storm <br /> event. The rational method was used to determine the Flow tributary to each <br /> Icatch basin. Tn be conservative, the pre-settling pipe (72-inch diameter) was <br /> modeled as a 12-inch diameter pipe. <br /> IThe inflow at CB #4 includes the controlled release rate from the existing <br /> I detention pipe. The controlled release rate for the 100-year storm event is 0.81 <br /> cfs. <br /> IFor the modeling of the STORM PROFILE 2, it is conservatively assumed that all <br /> runoff enters ihe system through CB #9. <br /> IThe (ollowing table shows the iniormation used io calculate the hydraulic grade <br /> Iline and the resulting freeboard. <br /> I Q Rim Elevation HGl Elevation Freeboard <br /> CB cfs (ft) ft_ t� t) <br /> 2 0.53 553.10 549.2f1 3.82 <br /> I _ 3 0.22 — 555.80_ — 550.46 5.34 <br /> 4 1.29 557.40 550.74 6.66 <br /> 5 0.39 557.40 551.29 6.11 <br /> 6 0.64 554.80 551.63 3.17 <br /> I7 .--— 0 __561.00_ 558.03 --— 2.97_ <br /> 8 0 5G6.00 56177 4.23 <br /> — 9 -- 2.d2-- — 571.40 568.17 3.23 <br /> Please refer to lhe Appendix for the StormCAD oatput. <br /> I <br /> , – – -- _-- -- ;— <br /> I�cbiu.ir., �� .'��nl . . . . I aur � <br /> / � �Z�t��� <br />