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. . '. . . . . . . . . . . . . . . . . Section I. II. III. IV. V. VI. APPENDIX TABLE OF CONTENTS ABSTRACT .............................................. INTRODUCTION .......................................... A. Scope of Work .................................. B. Coordination................................... C. Methodology........................ .............. DRAINAGE BASIN CHARACTERISTICS ........................ A. General ........................................ B. Dad Clark Gulch................................ C. Cl imato logy and Flood Hi stor y .................. HYDROLOGIC ANAL YS IS ................................... HYDRAULIC ANAL YS IS .................................... FLOOD HAZARD AREA DELINEATION......................... A. Flood Frequency and Di scharge .................. B. Flood Plain and Floodway Data .................. C. Flood Velocities and Erosion Potential......... REFERENCES ............................................ Flood Pl ain and Floodway Reference Data Sampl e Flood Hydrographs Peak Flow Profiles Flood Hazard Area Del ineation Drawings, Sheets 1 through 23 LIST OF TABLES o rii'~-i""~'!" i \wi ,," ' '0', i o . f.;,;; ~-XJl') ''i,> en) l>-_, """'I' ! (, .,c0R/r:n H''l"T'''''~'n [j'::; '--"'-~ -? ", ", ""~I-f'l'-"~Tln",: '",) ;_''-d .'~i. U (' " J '-:) D(11RM l~;L~! ',',: Si ;,"_T" LcJ:U,:.<:i'" I"~ DL/tW'<:I?] CVi.J;':b~,-"r\. (" ~ l/l;;,;U 00203 Page Page TABLE 1 - DESIGN 100-YEAR RAINFALL PATTERN....................... 5 TABLE 2 - WATERSHED AND HYDROGRAPH PARAMETERS AND CALCULATED PEAK 7 FLOW RATES ............................................. TABLE 2A- PEAK FLOW RATES......................................... 7 TABLE 3 - FLOOD PLAIN AND FLOODWAY REFERENCE DATA (without tentative culvert-type road crossings), sheets A - G... Appendix 1 1 1 2 2 2 2 2 3 4 8 9 9 9 11 12 TABLE 4 - FLOOD PLAIN AND FLOODWAY REFERENCE DATA (backwater at tentative culvert-type road crossings sheets), A and B. Appendix LIST OF FIGURES FIGURE 1 - PEAK TIME AND RATE OF FLOW COEFFICIENTS FIGURE 2 - IMPERVIOUS AREA/HOUSING DENSITY CURVE .............. 6 6 . . . . e . . ~ . . . . . . . . FIGURE 3 - SAMPLE FLOOD HYDROGRAPHS (at stations 101 +23 AND 147+00) ................................... Append ix FIGURE 4 - SAMPLE FLOOD HYDROGRAPHS (at stations 801 + 16 AND 209+80) ................................... Append ix FIGURE 5 - SAMPLE FLOOD HYDROGRAPHS (at stations 512+65 AND 301+00) ................................... Append ix FIGURE 6 - PEAK FLOW PROFILE (Reach 1 from station 100+00 to station 240+00) .................... FIGURE 7 - PEAK FLOW PROFILE (Reach 1 from stat ion 240+00 to stat ion 380+00) .................... FIGURE 8 - PEAK FLOW PROFILE (Reaches 2 and 3 from station 380+00 to stat ion 520+00) .................... FIGURE 9 - PEAK FLOW PROFILE (Reaches 3 and 4 from station 520+00 to station 660+00) .................... Appendix Append ix Appendix Appendix FIGURE 10 - PEAK FLOW PROFILE (Reach 5 from station 660+00 to station 800+00) FIGURE 11 - PEAK FLOW PROFILE (Reach 6 from station 800+00 to station 940+00) .................... Append ix .................... Append ix