Page 573 - Fair, Geyer, and Okun's Water and wastewater engineering : water supply and wastewater removal

JWCL344_ch14_500-554.qxd 8/7/10 8:56 PM Page 530
Illustrative Computations for the Storm Drainage System of Example 14.3
Tributary Area, Acres, a Time of Flow, min Weighted Mean Mean Runoff Rainfall Coefficient, Intensity, In To Upper c in./h i Drain End Total Increment (10) (9) (8) (7) (6) (5) 0.508 2.56 1.5 20.0 2.19 2.19 0.518 2.45 1.9 21.5 4.16 1.97 0.532 2.35 1.3 23.4 7.21 3.05 Profile Invert Elevation Drop in Lower Upper M.H., Fall, Length, Velocity, Capacity, Slope, End End ft ft ft ft/s ft 3 /s % (21) (20) (19) (18) (17) (16) (15) (14) 84.28 86.46 0.00 2.18 340

Location of Drain Manhole Number To From (4) (3) 2 1 3 2 4 3 Design ft 3 /s Diameter, in. Total (13) (12) 12 2.85 18 5.28 24 9.02 25.4 mm; 1 acre 0.3048 m/s; 1 in.

Street (2) A A B Runoff, Q Per acre ci (11) 1.30 1.27 1.25

Table 14.7 Line Number (1) 1 2 3 Line Number (1) 1 2 3 Conversion factors: 1 ft/s

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