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Floodplain Delineation Report <br />Hogue Pit Page 3 of 3 <br />the width of the river (150-175 feet) and the slope (nearly one percent), this is a reasonable <br />result. The floodplain is essentially contained within the channel until the far west end of the <br />site, where it spreads out into the adjacent pasture lands on the right overbank area. The <br />base flood elevation varies by cross-section. All elevations are indicated as Mean Sea <br />Level, 1929 NVGD, elevations. <br />Some floodwaters can run into the mining operation at the southwest corner of the existing <br />mine. A small berm, approximately 18" to two feet high will be required to provide adequate <br />protection from flood events. Details of a berm are shown on Figure 2. <br />The limits of the floodway and floodplain and shown on Figure 2. The remainder of Figures <br />3-9 show the result of the HEC-RAS analysis for both existing conditions and also for <br />conditions with a berm. Careful inspection of the data wilt show that very little difference in <br />Base Flood Elevation occurs by addition of the berm. <br />SUMMARY <br />The results of this floodway and floodplain study indicate that the gravel mining operation is <br />subject to flooding from shallow overbank flow coming into the southwest comer of the pit. A <br />low berm will be required to keep floodwaters from entering the pit. Details for the general <br />location and specific top elevation of the berm are shown on Figure 2. <br />Respectfully submitted, <br />WATER RESOURCE CONSULTANTS, LLC <br />~.~~~>> <br />Ppp RECiSrFlt <br />.~ P '. <br />J <br />i r <br />G75 • s 1 <br />~~ ~'~F ~ .. ~Ve <br />It Ssipa.~E__ <br />• • l.4! <br />Paul C. Currier, P.E. <br />WN~RYO11wCt OOlmsrun~, uc <br />G-1 <br />