This Code’s pro­tec­tion stan­dard is the base flood.  The best avail­able base flood data are list­ed below.  When­ev­er a par­ty dis­agrees with the best avail­able data, the par­ty shall finance the detailed engi­neer­ing study need­ed to replace exist­ing data with bet­ter data and sub­mit it to the FEMA and IDNR/OWR for approval pri­or to any devel­op­ment of the site.

(A) The base flood ele­va­tion for the flood­plains of Mis­sis­sip­pi Riv­er, Dutch Creek, Clear Creek, and Hutchins Creek shall be as delin­eat­ed on the 100-year flood pro­files in the coun­ty­wide Flood Insur­ance Study of Union Coun­ty pre­pared by the Fed­er­al Emer­gency Man­age­ment Agency and dat­ed May 2, 2008, Flood Insur­ance Study.

(B) The base flood ele­va­tion for each flood­plain delin­eat­ed as an “AH Zone” or “AO Zone” shall be that ele­va­tion (or depth) delin­eat­ed on the coun­ty­wide Flood Insur­ance Rate Map of Union County.

(C) The base flood ele­va­tion for each of the remain­ing flood­plains delin­eat­ed as an “A Zone” on the coun­ty­wide Flood Insur­ance Rate Map of Union Coun­ty shall be accord­ing to the best data avail­able from fed­er­al, state or oth­er sources.  Should no oth­er data exist, an engi­neer­ing study must be financed by the appli­cant to deter­mine base flood elevations.