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<br />The applicability of expression 3-3 would have to be determined from an <br />analysis of regional data. If the expression is reasonably predictive then <br />the values of the coefficients could be determined for input to the HYDPAR <br />program. <br /> <br />Figure 3-1 is a conceptually accurate display of the computational steps <br />needed for this method of calculating hydrologic parameters (needed in the <br />determination of direct runoff) as well. However, not all the data in the <br />grid cell data bank necessary for the SCS computations is needed when util- <br />izing equation 3-3 (as will be shown later in this section). <br /> <br />Future Program Additions. It is expected that in the future the HYDPAR <br />computer program would be expanded to include additional procedures for com- <br />puting precipitation-loss rates, such as the Holton (U.S. Soil Conservation <br />Service, 1972) and Horton (Lindsley, et al., 1958) methods. In addition an <br />effort would probably be made to include Clark's (Clark, 1945 and U.S. Army <br />Corps of Engineers, 1973) unit hydrograph characteristics and the kinematic <br />wave theory of describing overland flow. <br /> <br />Input Preparation <br /> <br />General Description. The following material describes the data (for the <br />HYDPAR computer program) which are entered on each input card and the type <br />of cards needed for the desired analysis to be performed. <br /> <br />The program is flexible to a degree in the data that can be input for analy- <br />sis and in the detail of the output desired. Some of the input cards are <br />optional and need not be provided unless required by the particular option <br />which is specified. <br /> <br />ProRram Data Hierarchy. The general hierarchy of the major data types <br />used in this program is displayed in Table 3-l. <br /> <br />3-8 <br />