Erosion and Sediment Pollution Control Program Manual.pdf

INLET FILTER BAG - Sediment Removal Efficiency: MODERATE. This device is an ABACT for
HQ but not EV watersheds. Filter bags should be capable of trapping all particles not passing a
No.40 Sieve.
Northampton Conservation District
Wherever filter bags are used they should be installed according to the manufacturer’s specifications.
Typical installation details should be provided on the drawings. Standard Construction Details # 4-15
and # 4-16 are recommended. NOTE: Filter bags designed to fit over the inlet grate are not
recommended for most storm sewer inlets. Use of such filter bags could result in a severe reduction of
the inlet capacity resulting in flooding or runoff bypassing the inlet. Wherever such bags are used, they
should be located at topographic low points and limited to ¼ acre maximum drainage areas. Inlet filter
bags are not acceptable as the primary BMP to remove sediment from site runoff water.
Inlet filter bags should be inspected on a weekly basis and after each runoff event. Filter bags should
be cleaned and/or replaced when the bag is half full or when flow capacity has been reduced so as to
cause flooding or bypassing of the inlet. Accumulated sediment should be disposed in the approved
manner. Bags that will be reused should be rinsed at a location where the rinse water will enter a
sediment trap or sediment basin. Damaged filter bags should be replaced.
Needed repairs should be initiated immediately after the inspection.
363-2134-008 / March 31, 2012 / Page 97