HYDROLOGIC AND HYDRAULIC TABLES AND CURVES

Transcription

1 APPENDIX C HYDROLOGIC AND HYDRAULIC TABLES AND CURVES PRECIPITATION TABLES Table C-1, page C-2, provides local data for use in designing drainage systems as discussed in Chapter 6. HYDROLOGIC SUPPLY CURVES FOR OVERLAND FLOW Figures C-1 through C-7, pages C-7 through C-13, represent the peak runoff rates from individual storm events of various durations, all of which have the same average frequency of occurrence. These curves are computed from Horton s equation given in Chapter 6, using a retardance coefficient in n = 0.04 and hydraulic gradient S = 1 percent. HYDRAULIC CHARACTERISTICS OF SELECTED DRAINAGE CHANNELS Tables C-2 through C-10, pages C-14 through C-22, present commonly used ditch sections, with cross-section areas and hydraulic radius, to facilitate selection of ditch size and shape. Hydrologic and Hydraulic Tables and Curves C-1

2 C-2 Hydrologic and Hydraulic Tables and Curves

3 Hydrologic and Hydraulic Tables and Curves C-3

4 C-4 Hydrologic and Hydraulic Tables and Curves

5 Hydrologic and Hydraulic Tables and Curves C-5

6 C-6 Hydrologic and Hydraulic Tables and Curves

7 Hydrologic and Hydraulic Tables and Curves C-7

8 Figure C-1. Rates of overland flow corresponding to standard supply curves, supply curve number 0.4 and 0.6; n = 0.40, S = 1 percent C-8 Hydrologic and Hydraulic Tables and Curves

9 Figure C-2. Rates of overland flow corresponding to standard supply curves, supply curve numbers 0.8 and 1.0; n = 0.40, S = 1 percent Hydrologic and Hydraulic Tables and Curves C-9

10 Figure C-3. Rates of overland flow corresponding to standard supply curves, supply curve numbers 1.2 and 1.4; n = 0.40, S = 1 percent C-10 Hydrologic and Hydraulic Tables and Curves

11 Figure C-4. Rates of overland flow corresponding to standard supply curves, supply curve numbers 1.6 and 1.8; n = 0.40, S = 1 percent Hydrologic and Hydraulic Tables and Curves C-11

12 Figure C-5. Rates of overland flow corresponding to standard supply curves, supply curve numbers 2.0 and 2.2; n = 0.40, S = 1 percent C-12 Hydrologic and Hydraulic Tables and Curves

13 Figure C-6. Rates of overland flo w corresponding to standard supply curves, supply curve numbers 2.4 and 2.6; n = 0.40, S = 1 percent Hydrologic and Hydraulic Tables and Curves C-13

14 Duration of supply in minutes Note: L = effective length of overland or channel flow, in feet. tc = critical duration of supply, in minutes, assuming surface storage as negligible. = rate of supply, in inches per hour. Figure C-7, Rates of overland flow corresponding to standard supply curves, supply curve numbers 2.8 and 3.0; n = 0.40, S = 1 percent C-14 Hydrologic and Hydraulic Tables and Curves

15 Table C-2. Hydraulic radius (R) and area (A) of symmetrical triangular channels Hydrologic and Hydraulic Tables and Curves C-15

16 Table C-3. Hydraulic radius (R) and area (A) of nonsymmetrical triangular channels C-16 Hydrologic and Hydraulic Tables and Curves

17 Table C-4. Hydraulic radius (R) and area (A) of symmetrical trapezoidal channels (2-foot bottom width) Hydrologic and Hydraulic Tables and Curves C-17

18 Table C-5. Hydraulic radius (R) and area (A) of symmetrical trapezoidal channels (4-foot bottom width) C-18 Hydrologic and Hydraulic Tables and Curves

19 Table C-6. Hydraulic radius (R) and area (A) of symmetrical trapezoidal channels (6-foot bottom width) Hydrologic and Hydraulic Tables and Curves C-19

20 FM /AFPAM , Vol 1 Table C-7. Hydraulic radius (R) and area (A) of symmetrical trapezoidal channels (8-foot bottom width) C-20 Hydrologic and Hydraulic Tables and Curves

21 Table C-8. Hydraulic radius (R) and area (A) of symmetrical trapezoidal channels (10-foot bottom width) Hydrologic and Hydraulic Tables and Curves C-21

22 Table C-9. Hydraulic radius (R) and area (A) of nonsymmetrical trapezoidal channels (2-foot bottom width) C-22 Hydrologic and Hydraulic Tables and Curves

23 Table C-10. Hydraulic radius (R) and area (A) of nonsymmetrical trapezoidal channels (4-foot bottom width) Hydrologic and Hydraulic Tables and Curves C-23