Encyclopedia of Environmental Science and Engineering, Volume I and II

URBAN RUNOFF 1187

1

0

10

20

30

(^234567)
DRY
YEAR
WET
YEAR
BOD
BOD
SS
SS
TANK SIZE.
UNIT REMOVAL, %
FIGURE 7 Unit removal efficiencies for CSO detention tanks
(EPA-600/7-77-014).
1
20
40
60
80
100
2 34 5 67
TANK VOLUME, MGAL/MI^2
*48.5 cm (19.1 in.) rainfall
+103.4 cm (40.7in.) rainfall
runoff coefficient (C) = 0.5
VOLUME
VOLUME
800
800
WET YEAR +
DRY YEAR +
SS
SS
PERFECT RETAINED, %
FIGURE 6 Percent retained versus tank volume (EPA-600/8-77-014).
C021_002_r03.indd 1187C021_002_r03.indd 1187 11/23/2005 9:45:45 AM11/23/2005 9: