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<br />and the proportion of the subbasin that is occupied by a particular land <br /> <br /> <br />use category (28). The percentage of the subbasin area associated with a <br /> <br /> <br />given land use is used to weight the percent imperviousness to derive the <br /> <br /> <br />subbasin average (29). <br /> <br />Included in the d.ta output for each subbasin is the computed basin lag (TP), <br />along with drainage area, stream length, length to centroid (LCA), stream <br />and subbasin slope, average imperviousness, and the number of grid cells (30). <br /> <br />Summary of Subbasin Data. One of the final pages of output is a summary <br /> <br />table of the subbasin values (31). The subbasins are identified, and computed <br /> <br /> <br />values are supplied for the following categories: drainage area, percent <br /> <br />of watershed that is represented by the identified subbasin, percent impervious- <br /> <br />ness, TP (lag), and subbasin slope. The remaining headings reflect input values. <br /> <br />Header Record. The final page of output, page 7, of Exhibit 3-2, repre- <br /> <br /> <br />sents the first record of Tape 20 and includes information taken from the <br /> <br /> <br />previous T4 and J2 cards (32). An explanation of the various field values <br /> <br /> <br />is given. It should be noted that the version number is for the user's <br /> <br /> <br />identification purposes and for recalling particular files with the ATODTA <br /> <br /> <br />program. <br /> <br />Sample Problems <br /> <br />Sample problems illustrating the two types of calculations currently avail- <br /> <br />able utilizing the HYDPAR computer program are included in Exhibits 3-3 and <br /> <br /> <br />3-4 of this section. The sample input and output will provide the user with <br /> <br /> <br />an overall description of the data necessary for program execution. The sample <br /> <br /> <br />problems will also provide a valid data set to verify program operations on <br /> <br /> <br />other computer systems. The necessary data input categories and codes used <br /> <br />from the Trail Creek data bank are incorporated in each of the problems. (It <br /> <br />should be noted that the output display is incomplete. Specific subbasin <br /> <br /> <br />data is given for only one of the twenty-one subbasins in the Trail Creek <br /> <br /> <br />Watershed). <br /> <br />3-l4 <br />