11-20-2006 Council Agenda - Laserfiche WebLink

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hour storm flows consistent with standards used by the City jn planning for the flood protection of homes and public facilities, 7. Floodplain No person or political subdivision shall altter, or fill land below the 100- year flood elevation of any water body, public water. or public water wetland without first obtaining, a. permiC from the Watershed District. Placement of till within the 1.00-year flaxlpl in is;pmhibited unless compensatory storage is provided. Compensatory storage must be provided on the development or immediately adjacent to the development within the affected. floodpla ;i,n. Compensatory storage shall result in the creation of floodplain storage to fully offset the loss oftloorllal tt h star ge. Compensatory storage shall be created prior to or concurrently to the permitted Jloodplaiu filline. b. All habitable build m *s, roads and underground parking structures on or adjacent to a jBojcict site shall comply with the following flood control.. {nd_(Teeboar¢-re00:6Smenfs: Sec Table 3 below tot freeboard requirements. {Deleted cities, ' Deleted: townships, counties, state, and federal agencies Deleted: As an additional safety factor, the lowest floor and low opening elevation ofa structure in a development should be at least Three feet above the 100 -year 24 -hour elevation of the pond. The lowtloor and low opening elevation of stmmtuues that are adjacent to ponds should be certified by the builder during basement construction to ensure adequate freeboard. An emergency overflow system must be established for the health and safety of the area. If the area is landlocked (no natural drainage outlet), the low floor and low opening elevation of stmchues should be five feet above the calculated high water level. In consideration of the groundwater table, the low floor and low opening elevation of structures should be four feet above the normal groundwater elevation. The table be low gives the recommended flood control and freeboard criteria. Deleted: <e>Floodplain filling shall be consistent with a state and FEMA approved noodplain ordinance and shall not cause a net decrease in flood storage capacity below the projected 100 -year flood elevation unless it is shown that the proposed filling, together with the filling of all other properties on the affected reach of the waterbody to the same degre of encroachment as proposed by the applicant, will not cause high water or unduly aggravate flood flows to the point of flooding on other properties. The allowable till area shall be calculated by a professional engineer registered in the Slate ofMinncsota.i u Tow Flogf, {�mcP b,,,,I Ii)nnum of h,{ Condition above the 100-von r flood elevation 01 one- foot above the emereeenev overflow elevation unless flood proofing measures are constructed with the building, low ta2nio,g. unntboo.nwumum.. 7._f1e[ above the 100 -ven flood elevation or ono toot 0.1,50e the emeresnev overflow elevation. Table loot Control Freeboard Reg s Cori Rion Water Bodies with Piped Outlets and Mississippi River l ah,r Bodies without Piped Outlets Sub tee nwater Il1a0m emen Low [loot- 11,)0,51 1 u..1 mamma of 2 feet above the 1 00-voar flood elovatiun. Vow I eitubl u041i Low floor must be f minitnnni 9f 5 [eg above the• 100 -voar . . .. . . . .. . . . . . . . . . . . . . . . . flood elevation. Evnung l ibitable :uddmgs id laeen to and P temtialle Affected by Flood W a ev _.ow o mill {gust be a minimum of 2 feet above the 100 -voar flood elevation. Loa oputi11. must 0„ a iiininulm o1 feet above Liss; t00 yar flood Low floor inu51 be a Ir1111111 um of 2 feet above the 1 00-voar flood elevation or one Ina rbov , Mil e merLcneY mc,rfloW elevation unless •tlood proofing measures u are constructed With the 13MP Loa openinu must be a minimum of 2 feet above the_1 0 year [loud olevat{,o11- or..000 foot above the omeigeucv overflow elevation. U nder{eramrrl ..Lowe eniog must be a minimum of 2 feet _ L OK ppp {t_ng mint be a minimum of 2 feet ow open,, ..a.unnt e n,{llmlmam elf,?,r_PgeJ above the I00 -voar flood or one foot above Model Stortnwater Ordinance Page 9 NEMO Ordinance Project - 1 3 -