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<br />Terms and Notations <br /> <br />A--Cross sectional area (It') <br />g-Acceleration of gravity (32.2 It/sec') <br /> <br />h-Flow depth (It) <br /> <br />KD-Conveyance equal to 1.486 A r'/' <br />n <br /> <br />M-Ratio of conveyances in the BPR bridge loss analysis <br /> <br />n-Manning's coefficient of roughness <br /> <br />P-Wetted perimeter-the length of wetted surface meas- <br />ured along a cross section <br /> <br />Q-Discharge (It'/sec) <br /> <br />r-Hydraulic radius or the ratio of area to wetted perimeter <br /> <br />T -Section top width at the free water surface (It) <br /> <br />csm-Cubic feet per second per square mile <br /> <br />Energy level.-Elevation of energy grade line which is water <br />surface elevation plus velocity head. <br /> <br />Segment.-A part of the valley section that has uniform <br />roughness and no rapid change in wetted perimeter with <br />a small change in depth. <br /> <br />Damage segment.- The part of the cross section where l[Ico- <br />nomic losses occur. <br /> <br />Nondamage segment.- The part of the cross section that is <br />not a part of the channel system and where economic <br />fosses are not considered. <br />