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<br />IV. HYDRAULIC ANALYSIS
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<br />f~drauli~ characteristi~s of the flood plain were evaluated to
<br />determine water surface elevation for peak flows resulting from the
<br />5..10-.25-, 50.. 100.. and SOD-year floods. Thewatersurface
<br />e1 evations were co.nputed using the U,S. A~my Corps of Engineers'
<br />llEC~2 water surface profile computer program (U.S. Anny. 1981). Much of
<br />the cross.secti ona 1 da ta ~Iere provided in HEC.2 format by the Ci ty of
<br />Sterling. Corrections and additional cross sections were made from sub.
<br />sequent field surveys.
<br />Culvert and bridge geometries were field measured, Elevations for
<br />top of road crossings and downstream and unstreamcMonel inverts were
<br />fi e 1 d surveyed. Roughness coeffici ents \~ere sel ec ted after ff eld i nves t i-
<br />gation and analysis of ground and aerial photographs taken durin9 field
<br />reconnaissance. Manning's roughness coefficients are tabulated in the
<br />H~C.~ runs and supported by photographs In the Technical Addendum,
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<br />Results
<br />Flood profiles are presented in Figllres P-1 thrOugh P-7 for the 3 channel
<br />reaches as follows:
<br />1. Sand Creek and Local Drainage,
<br />2, Pioneer Drainage Ditch. and
<br />3. Pawnee O~erflow
<br />The water surface ele~ations are given in Tables .J through 5, The extent
<br />of flooding is shown on the flooded area maps. A detailed description of
<br />the hydraulic analysis is included in the Technical Addendum(L eaf.lg83)
<br />along with lheHEC-2Runs.
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