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<br />The section rating table contains information at bankfull and zero <br /> <br />channel segments. <br />by interpolation. <br /> <br />Zero damage is the lowest point in the damage segments. <br /> <br /> <br />is the lowest of al I first and last points defining <br /> <br /> <br />Discharge and end area at these elevations are found <br /> <br />damage elevations. <br />Bankfull elevation <br /> <br />Two methods can be used to determine flow rates at each cross section. <br /> <br /> <br />One method uses CSM (ft. 3/sec. 1 miZ) values as input which are then <br /> <br /> <br />converted to cfs (ft. 3/sec.) values by the computer program. The <br /> <br /> <br />other method is based on direct input of cfs values. <br /> <br />TR20 <br />The TRZO (Computer Program For <br />was developed by the Hydrology <br />hydrograph laboratory of ARS. <br /> <br />Project Formulation Hydrology) program <br />Branch of SCS in cooperation with the <br />The program computes surface runoff <br /> <br />resulting from any synthetic or natural rain storm. It takes into <br /> <br /> <br />account conditions having a bearing on runoff and routes the flow through <br /> <br /> <br />stream channels and reservoirs. It combines the routed hydrograph with <br /> <br /> <br />those from other tributaries and prints out the peak discharges, their <br /> <br /> <br />time of occurence and the water surface elevation for each at any de- <br /> <br />sired cross section or structure. In addition, it will print out the <br /> <br /> <br />coordinates of the routed hydrograph together with the corresponding <br /> <br /> <br />elevation of each if requested. <br /> <br /> <br />The program provides for continuous analyses of nine different storms <br /> <br /> <br />over a watershed under present conditions, and with various combinations <br /> <br /> <br />of land treatment, flood water retarding structures and channel improvement. <br />