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<br />Program Language: <br />Memory Requirement (limit): <br /> <br />Special Library Functions: <br />Printer Positions: <br />Tspe Assignments: Tape 1: <br />Tape 5: <br />Tape 6: <br />Tape 20: <br /> <br />Storage Devices (permanent): <br /> <br />FORTRAN IV (ANSI standard) <br /> <br />424,000 words (octal) of core (word size- <br />60 bits) <br /> <br />none <br /> <br />132 <br /> <br />Grid cell data bank <br /> <br />Standard card input <br /> <br />Standard line printer <br /> <br />File that may be saved or passed to ATODTA <br />(ATODTA included in Section 5 of this report) <br /> <br />2 magnetic tapes or disk units <br /> <br />Specific CaPabilities. The HYDPAR program computes and formats for <br /> <br /> <br />subsequent use, hydrologic parameters that permit determination of precipi- <br /> <br /> <br />tation loss-rate functions and surface runoff response. <br /> <br />The program has the capability to compute SCS 6urve Numbers and unit hydro- <br /> <br /> <br />graph parameters (basin lag) based on the SCS dimensionless unit hydrograph <br /> <br /> <br />procedure. The program also has the option to compute the percent of imper- <br /> <br />vious surface within a watershed and calculate unit hydrograph parameters <br /> <br /> <br />utilizing the Snyder approach. <br /> <br />The functions defining the relationships between the geographic data drawn <br /> <br /> <br />from the grid cell dsta bank (land use, subbasin boundaries, hydrologic- <br /> <br />soil group, surface slope, etc.) and the selected procedure are defined ex- <br /> <br />ternally and input to HYDPAR. The HYDPAR program performs the appropriate <br /> <br /> <br />file manipulations, computations and bookkeeping, prints the results, and <br /> <br /> <br />then if the user desires, writes a tape for further automated processing. The <br /> <br />tape results (Tape 20) should be saved (written onto a system library mag- <br /> <br />netic tape or disk) if the results of a HYDPAR run are to be used as input <br /> <br />to the ATODTA program at a later time. (System control cards are used to <br /> <br /> <br />save Tape 20). <br /> <br />The HYDPAR program computes drainage areas for subbasins by one of two methods: <br />(1) by multiplying the size of the grid cell area by the sum of the cells <br /> <br />, <br /> <br />3-3 <br />