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STORh1W'ATLR SITti PLAN <br />b1ADISON CO�1nfUNITY CINRCH <br />Sec Appcndix B for basin output. <br />DEVELOPED BYPASS BASIN HYDROLOGY <br />This basin has a tributary arca of 0.13 acres. <br />The basin has the following devcloped land uscs and arcas: <br />Land Usc Arca(ac) <br />Pavement and Sidewalk 0.13 <br />Tlie devclopcd runoff rates are: <br />Ycar 2 yr 10 yr I 00 yr <br />Runoff Ratc (cfs) 0.04 0.07 0.10 <br />Volumc(c� 627 954 1,424 <br />See Appendix B for basin autput. <br />n�nv ze, zoo6 <br />PAGL' 11 <br />The incrcase in runoff from the Bypass Basin is Uie differcncc in runoff bctwcen the existing and <br />developed wnditions for the basin. The allowable dischargc rate from the detention pond will bc <br />reduced by the Bypass Basin Rate to accomodate thc bypass basin. <br />Storm Evcnt Dcveloped Rate - Exish'y Rate = Bvnass Basin Ratc <br />2 Ycar 0.04 -�_ 0.02 = 0.02 <br />10 Ycar 0.07 - 0.03 = 0.04 <br />100 Ycar 0.10 - 0.06 = 0.04 <br />RETENTION/DETENTION SYSTEM <br />� ,. <br />_ �� � . <br />Thc srorni drainagc systcm uscd for thc dcvclopment consists of collcction and <br />convcyance of runoft' to an open wet pond with an `open water' cclls followed by a, <br />'vcgetatcd trcatement ccll'. Thc release from the detention pond then Flows to the existing � <br />stonn systcm in �Vetmore Avcnuc. Both the `opcn water' and 'vegctated treatment' cclls <br />also providc additional `livc' storage for dctcntion. , <br />'CREAT��IENT I3MP5 � . � — <br />BMP RD.OS WETPOND <br />Thc minimum rcquircd ��olmnc of thc `dcad storagc' is thc runoff volume from ihc 6 <br />month stomi cvcnt, or 5,95d cE This will bc providcd in both thc 'open watcr' and <br />'��cgctatcd troatcmcnt ccll'. <br />A pond acccss road is providcJ to thc bottom of the `open water' ccll so no prrtrcatment <br />�ault is rcyuircd. A 72" manholc with a 4' decp sump and tumdo���n clbow will bc <br />pro��idcd prior to discharge to the detention pond to provide for somc sediment rcmoval. <br />Nidi thc 4' sump, I 13 cf of `dcad storagc' is providcd in this catch basin. <br />J M.rv�y Pa•A Comm�nny Gcrc� - SIF OJ-0.9'Ara�nage�SSP Ma�ison W C�V✓fi/SRfI <br />