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Appendix A —Ordinances <br />Updated Storm Water Management Plan (SWMP) <br />City of Ramsey, Minnesota <br />buffer areas, pr vidod it d osn't reduce tho buffer's ability t treat st rm water and that tho am unt f buff r <br />width cncr ached up n d s n t oxco d 50 percent f th t tal area rcquir d f r such p nding. <br />Historical Note <br />Ord. #05 27 added §9.26 "Wetland Pr tecti n". <br />Effective N vember 11, 2005. <br />Control Ordinance <br />Ordinance N .: 06 32 <br />Rams y City C do: 9.27 <br />tt <br />must n t increase vor xc d seventy five p rcont (75%) f the pr dov 1 pm nt ton (10) year and no <br />hundred (100) year peak discharge rates, based n the last ten years f h w the land was used. Als <br />acs lorat d d wnstr am chane 1 r si n must n t ccur as a result f tho pr p sod activity. F r w tlands, <br />volume control is more important. <br />Subdivision 1. The applicant shall install, construct, or pay the city fees for all storm water <br />management facilities necessary to manage increased runoff, so that the discharge rates from storm water <br />treatment basins f r the predevel pment ten (10) year, and ne hundred (100) year peak st rm discharge <br />rates are not increa.,ed do not exceed „eventy five percent (75%) of the predevelopment ten (10) year and <br />ne hundred (100) year peak discharge rates. The predevel pment rates shall be based n the last ten (10) <br />years of how the land was used. Accelerated channel erosion must not occur as a result of the proposed <br />land disturbing r dcv 1 pm nt activity. An applicant may als mak an in kind r a m nctary <br />d signed t serve multiple land disturbing and dovol pm nt activiti s undertaken by ne r m re p rs ns, <br />including the applicant. <br />Subdivision 2. All calculations and information used in determining these peak storm discharge <br />rates shall be submitted al ng with th st rm wat r p lluti n c ntr 1 plan. <br />Pr and P st dcv 1 pment discharge rates shall beg n rat d using SCS TR 20 r SCS TR 55 <br />moth d 1 gy using a 21 h ur SCS typ II rainfall distributi n. Tho 10 year, 21 h ur rainfall depth shall <br />be 1.1 inches f t tal precipitati n, and the 100 year, 21 h ur rainfall depth shall be 5.1 inches f t tal <br />Appendix A <br />February 20, 2015March 6, 2015 <br />Page 73 <br />