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9F� <br /> it s 17 !' Dane County Land & Water Resources Department <br /> a '' Administration • Land Conservation • Office of Lakes&Watersheds• Parks • Water Resource Engineering <br /> • ? Kevin F.Connors,Director <br /> ,scoNe: <br /> July 11, 2016 <br /> Dane County Planning and Development <br /> Room 116 <br /> City-County Building . <br /> Madison, WI 53703 <br /> Floodplain Development Permit DCPFLO-2016-00008 <br /> Weisensel Pedestrian/Snowmobile Bridge <br /> Town of Sun Prairie, Section 33 <br /> The proposed snowmobile and pedestrian bridge will cross an unnamed tributary of the Koshkonong <br /> Creek in McCarthy County Park on parcels 0811-331-8000-5 and 0811-331-8690-1. The plan conforms <br /> to Dane County Code of Ordinance, Chapter 17, Floodplain Regulations. <br /> The lowest chord of the new bridge will be at approximately 900'. An equivalent volume of soil,4 cubic <br /> yards, will be removed from the floodplain zone as compensatory fill for the volume of the structure of <br /> the bridge. The decking of the structure measures 50' by 12' by 1.5"thick, equaling 75 cubic feet which <br /> gives approximately 2.78 cubic yards. The metal I-beams measure 4"wide by 14"tall and the metal is <br /> 0.5"thick, equaling 3.82 cubic feet. There are (7)I-beams total, adding up to.26.74 cubic feet, which is <br /> approximately 0.99 cubic yards. Adding together the totals for the decking and the I-beams, we reached a <br /> total of 3.78 cubic yards and rounded to 4 cubic yards to be on the safe side. We expect no adverse <br /> impact to the regional floodplain. <br /> The following conditions were considered in the design: <br /> • This development shall not obstruct flow, defined as development which blocks the conveyance <br /> of floodwaters by itself or with other development, causing any increase in the regional flood <br /> height; or cause any increase in the regional flood height due to floodplain storage area lost. <br /> • Bridge shall be designed and constructed to have a low flood damage potential. <br /> • Adequate flood proofing measures shall be provided to the flood protection elevation. <br /> The attached map provides a site location of the bridge, including contour elevations. Dane County <br /> Water Resource Engineering has reviewed this plan and are providing their approval. <br /> 40,incerely <br /> VP/ ' <br /> J- emy Balousek <br /> Division Manager <br /> Water Resource Engineering Division <br /> Lyman F.Anderson Agriculture&Conservation Center <br /> 5201 Fen Oak Drive,Room 208,Madison,Wisconsin 53718-PH:608/224-3730,FAX:608/224-3745 <br /> www.countyofdane.com/lwrd <br />