MIL-HDBK-1005/9A
Plate Surface Area (Ap) normally available from
manufacturer's data (manufacturer value not available for SI
size):
Ap = 20 ft2/plate [1.85 m2/plate]
Determine:
Total Plate Area Required (At):
At = QI/QSR = 510 gpm/(0.1389 gpm/ft2) = 3,672 ft2
[At = 1932 L/min/(5.66 L/min⋅m2) = 338.9 m2]
Number of Parallel Plates Required (Np):
Np = At/Ap = 3,672 ft2/(20 ft2/plate) = 183.6
[Np = At/Ap = 338.9 m2/(1.85 m2/plate) = 183.6]
Use 184 plates, minimum.
3.10.5
Skimming Dam. Locate low dam or weir in drainage
channel at least 50 feet (15.2 m) downstream from the nearest
storm drain outlet to pond water; provide an open port in the
dam to drain the pond in dry weather. Design a port to
accommodate estimated dry weather flow. Refer to Figure 20 for
details. Use float and boom to trap and divert floating oil and
grease to the side of channel. Ensure that floating diversion
boom extends at least 3 inches (76 mm) below surface of water.
Provide a movable belt skimming device to skim oil to a
collection hopper for storage. Design a channel for a maximum
horizontal velocity of 12 fpm (3.7 m/min), based on rainfall
intensity-duration-frequency curve data for a 1-year frequency
storm at the specified geographical location. Contact Federal,
State, and local regulatory agencies to determine the adequacy
of this storm frequency interval. Consider surrounding
topography and drainage basin characteristics when establishing
channel dimensions; the minimum length of channel should be 50
feet (15.2 m). Avoid surcharging storm sewer outlets at high
water level.
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