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<br /> <br />Subiect: <br /> <br />"Instruction Manual for Site Drainage Computer Model - Rocky Flats Plant, <br />Golden, Colorado." Lee Wan and Associates. February 13, 1987. <br /> <br />This Rocky Flats Plant site drainage system analysis was done for Rockwell International. <br />The purpose of the study was two-fold: (1) to establish a TR-20 computer model of the <br />existing storm drainage system at Rocky Flats, and (2) to analyze the adequacy of the <br />existing drainage system for the 25-year design storm, Woman Creek and Walnut Creek <br />were modelled from the headwaters to Indiana Street. <br /> <br />Limitations <br /> <br />1. Analyses were limited to those based on the 25-year, I-hour storm frequency, <br /> <br />2, A summary of discharges is not provided, <br /> <br />3, The study does not incorporate accepted practices and policies for drainage <br />and flood control of the Denver metro area, Functioning of a master drainage <br />system is not addressed, <br /> <br />Data Included <br /> <br />1. Detailed mapping (1"=200' reduced to 1"=600') of the Woman Creek and <br />Walnut Creek drainage basins with delineation of approximately 150 sub- <br />basins is provided in the document on 8l;"x 11" sheets, <br /> <br />2, Line diagrams for the drainage system are presented in the document. These <br />contain basin information of drainage areas, time of concentration and curve <br />number, They also contain culvert/storm sewer information of size, length, <br />and invert and outlet elevations, The culvert/storm sewer information is <br />reportedly more comprehensive than that available from the site utility <br />drawings (Le" this information should be considered more reliable), <br /> <br />3, Flows calculated by the model are provided only in the computer output, <br /> <br />4, The 25-year, I-hour design storm precipitation distribution based on the <br />UDFCD Manual is presented in Table 4,1 of the document. <br /> <br />5, <br /> <br />The existing storm drainage system is adequate for the 25-year flood event <br />with the following exceptions: (1) The storm drains around Building 460, (2) <br />the 1,200 foot long by n.inch diameter storm sewer under parking area 771, <br />and (3) the 1,400 foot long by 42-inch diameter A-Series ponds bypass, <br /> <br />6, <br /> <br />Schematic diagrams of the surface drainage system and pond operations are <br />provided in the document. II <br />