10-22 Council Ordinance - Laserfiche WebLink

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ndc fnr. ::if leastthe - one -lip : rstorn4_ frory , uonr+w o ionfiz fn oyiefinrr nc» k r1 innff czifoiz • � nrl %fit t a-In -+ ho '1 tln _ yeaF nri in1l Sfnrm o " ont The City adopts by reference RCWD Rules C . 9 . (D as amended . #)Lqh. Freeboard requirements . All new residential , commercial , industrial and other habitable or non - habitable structures , and all stormwater basins , must be constructed so that the lowest floor and lowest entry elevations of structures comply with ��IIn, ^ , inn . Table 1 . Table 1 . Low floor and low entry freeboard requirements Regional Local Detention Infiltration Basins Rain Groundwater) Flood Basins & Gardens Elevations Wetlands Elevation 100 year EOF 100 EOF Bottom 100 EOF EOF Seasonal High year year Level Low Floor 2 - RTI . 1 -ft O -ft N /A O - ft N /A N /A N /A 4 -ft Freeboard Low Entry N /A N /A 2 - ft 1 -ft N /A 2 -ft 1 -ft 0 . 5 -ft N /A Freeboard The seasonal high Rroundwater level shall be determined within 12 months of proposed construction of the structure by a soil scientist or geotechnical engineer registered in the State of Minnesota as indicated by redoximorphic features such as mottling within the soil or by direct groundwater observation . O)L I.Within a landlocked basin , lowest floor elevations must be at least one foot above the surveyed basin overflow elevation . Where a structure is proposed below the runoff elevation of a land - locked basin , the low_floor elevation will be a minimum of two feet above the high water level as determined from an estimate of high water levels determined from the highest of either the 100 - year , ten - day runoff event or back -to - back 100 -year , 24 - hour rainfalls . Aerial photos , vegetation , soils , and topography will be used to derive a " normal " water elevation for the basin for the purpose of computing the 100 year elevation . 25