STANDARD INLET PROTECTION

Definition

A filter constructed around a storm drain inlet.

Purpose

Storm drain inlet protection is a secondary sediment control device and is not to be used in place of a sediment trapping devise unless approved by the appropriate approval authority.

Design Criteria

Storm drain inlet protection shall be used when the drainage area to an inlet is disturbed and the following conditions prevail:

1.  It is not possible to temporarily divert the storm drain outfall into a sediment-trapping device;

2. Watertight blocking of inlets is not advisable; and

3. Drainage area is less than 1/4 acre for standard inlet protection. 

Maintenance

Maintenance requirements for storm drain inlet protection are intense, due to the susceptibility to clogging.  When the structure does not drain completely within 48 hours after a storm event, it is clogged. When this occurs, accumulated sediment must be removed and the geotextile fabric and stone must be cleaned or replaced.
 

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