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<br />Introduction <br /> <br />The WSP2 (Water Surface Profile 2) com- <br />puter program can aid in the determination <br />of flow characteristics for a given set of <br />stream and flood-plain conditions. More <br />specifically, it can compute water surface <br />profiles in open channels. The program <br />also can estimate head losses at restrictive <br />sections, including roadways with either a <br />bridge opening or culverts. <br />To use this program effectively, thorough <br />understanding of the following procedures <br />is necessary: <br /> <br />1. Procedures described in SCS National <br />Engineering Handbook, Section 4, Chapter <br />14 (hereafter referred to as NEH-4). <br /> <br />2. Bridge loss analysis described in "Hy- <br />draulics of Bridge Waterways," Hydraulic <br />Design Series No.1, 2nd ed., Bureau of <br />Public Roads, U.S. Department of Trans- <br />portation, Washington, D.C., 1970 (here- <br />after referred to as BPR Manual). <br /> <br />3. Standard step method for running back- <br />water profiles. One of several books in <br />which this method is described is Ven Te <br /> <br />Capabilities <br /> <br />WSP2 can rate a valley at specified <br />points. This rating provides information on <br />elevation, discharge, flow area, and flooded <br />area. The program computes up to 15 <br />water surface profiles for a combined total <br />of 50 reach and road sections. The dis- <br />charge rate for each profile can be con- <br />stant, variable, or user-selected. A job can <br />be extended beyond 50 sections by the <br />LINK feature and beyond 15 profiles by the <br />CHANGE feature. The use of these features <br />is described in detail in another section. <br />More than one jOb can be processed in <br />one run by putting the ENDJOB card after <br />each job and the END RUN card after all of <br /> <br />Chow's "Open Channel Hydraulics," Mc- <br />Graw Hill Co., New York, 1959. <br /> <br />WSP2 is written in Fortran IV computer <br />language and was deveioped on an IBM <br />360/65 computer. The three subprograms <br />(HROFDA, DATE, and REREAD) were writ- <br />ten in assembly language. Various field <br />locations have adapted WSP2 to CDC and <br />Univac systems. <br />The program requires about 220 kilobytes <br />of core storage and three temporary data <br />files. Specific information about the data <br />files is on comment cards at the beginning <br />of the program listing. A WSP2 systems <br />guide is available from the SCS Central <br />Technical Unit to aid in impiementing, un- <br />derstanding, debugging, and modifying the <br />program. <br />Because the computations require a <br />large amount of physical data on valley <br />shape, roughness, flow restrictions, etc., an <br />attempt was made to make data entry as <br />easy and flexible as possible. Punched out- <br />put cards provide direct input to SCS flood <br />routing and economic analysis computer <br />programs. <br /> <br />the jobs. Results of computations from up <br />to 20 cross sections can be saved for later <br />computations by using a TRIB card. <br />The shape of each vaHey cross section <br />can be defined by up to 48 horizontal and <br />vertical points. The vertical coordinate can <br />be given in either elevation or rod reading. <br />The points can be entered in order or <br />randomly. If points are entered randomly, <br />WSP2 automatically reorders them accord- <br />ing to increasing horizontal distance, ex- <br />cept for points that have identical horizon-' <br />tal distance. Such points must be entered <br />in the correct order because WSP2 will not <br />change their order of entry. A cross section <br /> <br />1 <br />