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1 <br /> f , � <br /> IDrainage Report <br /> for Kerl E3est <br /> IOctober I, 1999 <br /> Page 2 <br /> ISecUon 2. Ueveloped Sile Condilfons <br /> IDeveloped sile conditions include lhrce existing 4-plex buildings; one proposed 9-unit <br /> � building and one proposed 4-plex building wilh parking. The remeining pervious area <br /> n(ler developmenl will be eilher covered by lawns or landscaping. The complex will <br /> � have access fram Casino Road. <br /> ISince lhe runoff Gom Ihe site splils and (lows in hvo directions, and lhc majoriry is in lhe <br /> norlh sub-bnsin, delenlion for anly lhe north sub-basin will be provided. 'I'here is <br /> Iapproximnlely 289 square feet of addilionnl impervious area tl�al is within lhe south sub- <br /> I bnsin. To compensale for 'he 289 square feel in lhe south basin, lhe vuult will be <br /> designcJ so thal thc total increasc in impervious aren is in the north basin. <br /> IA delention vault will be construcled on Ihe north side of the proposed 9-wiit building <br /> I (Ihc slniclures will shnre lhe same woll). Since lhere is less Ihmi 5,000 square feel of <br /> addition�l pavement, runoff treatment is nol required. Streambenk erosion control, <br /> Iho«�ever, is required. The delenlion vault will be open al Ihe lop end the dimensions will <br /> be 39' x 12' wilh a liigh waler deplh of 4.91 feeL These dimensions include tlie safely of <br /> � fnctor required with the usc of the SCS mcthod for lhe vaull design. See weterworks <br /> shects in Scclion 4. <br /> t <br /> Disdiarge from the vault will out0ow to a riprap pad nnd (low lo �n exisling drninage <br /> i <br /> dilch that will convey Ihe fbw lo an exisling 18" concrete culverl thal crosses SR-S . <br /> 'I'hc drninage (lows easterly nlong SR 52G end Ihen (lows north into thc Pigeon Creek No. <br /> I 2 prainage Dnsin. See figure 3 in Seclion 4. <br /> I <br /> I �5 <br /> , � <br />