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<br />HEC-2 <br />WATER SURFACE PROFILES <br /> <br />PROGRAMMERS MANUAL <br /> <br />INTRODUCTION <br /> <br />1. ORIGIN OF PROGRAM <br /> <br />This November 1976 version of HEC-2 is intended to replace the AU9ust <br />1971 version. HEC-2 was developed in The Hydrologic Engineering <br />Center, by Bill S. Eichert. The basic computational capabilities for <br />calculating water surface profiles have remained essentially unchanged. <br />The new version has added capability for output display, potential <br />for interactive computer terminal usage, and reduced storage require- <br />ments. <br /> <br />2. PURPOSE OF PROGRAM <br /> <br />The program computes and plots (by printer) the water surface profile <br />for river channels of any cross section for either subcritica1 or <br />supercritica1 flow conditions. The effects of various hydraulic <br />structures such as bridges, culverts, and weirs may be considered in <br />the computations. Capabilities are available for assessing the <br />effects of channel improvements, levees and f100dways on water surface <br />profiles. Input may be in either English or Metric units. <br /> <br />3. SUPPLEMENTARY PROGRAM <br /> <br />A data edit program (723-G1-L202C) which checks the data cards for <br />various input errors is available. <br /> <br />4. NOTIFICATION OF PROGRAM MODIFICATIONS <br /> <br />The Hydrologic Engineering Center keeps a mailing list of offices <br />having HEC-2 source decks. Notification of error corrections and <br />other program modifications is sent periodically to all addresses <br />on the list. <br /> <br />A user who finds an error in the program is requested to notify <br />The Hydrologic Engineering Center. Also, the Center wishes to be <br />notified of any changes that are required to run the program, other <br />than those discussed in "Equipment Requirements." <br /> <br />3 <br />