Laserfiche WebLink
21 <br />Land Use Limitations Utility locations <br />Adjacent wells <br /> <br />BMPs must provide infiltration where feasible. If the city concurs that the <br />infiltration BMPs are not feasible or directs that infiltration not be used, then any BMP <br />may be chosen. If infiltration is feasible on-site, then a regionally-sited BMP must <br />provide equivalent runoff volume reduction. <br />(6) Peak stormwater runoff control. The City adopts by reference RCWD Rule C7. <br />Peak Stormwater Runoff Control as amended. <br />(a) Stormwater runoff rates for the proposed project at the site boundary, in <br />aggregate, must not exceed existing runoff rates for the critical two-, ten-, and 100-year <br />frequency events. <br />(k) Any increase in a critical event rate at a specific point of discharge from the <br />site must be limited and cause no adverse down gradient impact. The project must meet <br />the hydroperiod standards found in Table 4 with respect to all down-gradient wetlands. <br /> <br />Table 4. Hydroperiod standards <br /> <br />Wetland <br />Susceptibility <br />Class <br />Permitted <br />Storm Bounce for <br />2-year and 10-year <br />Event* <br />Inundation <br />Period for 2-year <br />Event* <br />Inundation <br />Period for 10-year <br />Event* <br />Highly <br />Susceptible <br />Existing Existing Existing <br />Moderately <br />Susceptible <br />Existing + <br />0.5 ft <br />Existing + 1 <br />day <br />Existing + 7 <br />days <br />Slightly <br />Susceptible <br />Existing + <br />1.0 ft <br />Existing + 2 <br />days <br />Existing +14 <br />days <br />Least <br />Susceptible <br />No Limit Existing + 7 <br />days <br />Existing + 21 <br />days <br />* Duration of 24-hours for the return periods utilizing NOAA Atlas 14 <br />precipitation data. Source: Adapted from Rice Creek Watershed District 2013 Rules. <br /> <br />Wetland Susceptibility Class is determined based on wetland type, as follows: <br />Highly susceptible wetland types include: sedge meadows, bogs, coniferous <br />bogs, open bogs, calcareous fens, low prairies, coniferous swamps, lowland hardwood <br />forests, and seasonally flooded water basins. <br />Moderately susceptible wetland types include: shrub-carrs, alder thickets, fresh <br />(wet) meadows, and shallow and deep marshes. <br />Slightly susceptible wetland types include: floodplain forests and fresh wet <br />meadows or shallow marshes dominated by cattail giant reed, reed canary grass or <br />purple loosestrife.