Stormwater Management Standards Manual - Toledo Metropolitan ...
Stormwater Management Standards Manual - Toledo Metropolitan ...
Stormwater Management Standards Manual - Toledo Metropolitan ...
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11. Storm Sewer Inlet Protection<br />
Description<br />
All storm sewer inlets that accept water runoff from the development area shall be protected so that<br />
sediment-laden water will not enter the storm sewer system without first being treated to remove<br />
sediment, unless the storm sewer system drains to a settling facility.<br />
When working properly, inlet protection will slow runoff and may cause water to pond. When used on<br />
curb inlets, streets can temporarily flood during heavy storms. Consult with local reviewing agency<br />
before installing curb inlet protection.<br />
Applicability<br />
Inlet protection essentially clogs storm drain inlets. The effect on the site’s drainage that will result from<br />
blocking storm drain inlets must be considered. This practice is not recommended as the primary<br />
means of sediment control. It should only be used if it is not possible to divert the runoff away from the<br />
storm drain inlets.<br />
Design Guidelines<br />
Frame<br />
A wooden frame shall be constructed of 2 X 4 in. construction grade lumber. For inlets in swales, ditch<br />
lines and yards, the posts shall be driven 1 ft. into the ground at all four corners. For curb inlets, the end<br />
spacers shall be a minimum of 1 ft. beyond both ends of the throat opening.<br />
Wire Mesh<br />
Wire mesh shall be of sufficient strength to support the geotextile cloth with water fully impounded<br />
against it. It shall be stretched tightly around the frame and fastened securely to the frame.<br />
Geotextile Cloth<br />
The Geotextile cloth shall have an equivalent opening size (EOS) of 20-40 sieve and be resistant to<br />
sunlight. For inlets in swales, ditch lines, and yards, the geotextile shall extend from the top of the frame<br />
to 18 in. below the inlet elevation. For curb inlets the cloth shall be a continuous piece, with a minimum<br />
width of 30 in. and 4 ft. longer than the throat length of the inlet (2 ft. on each side).<br />
Rock<br />
For curb inlets, two-inch stone shall be placed over the wire mesh and geotextile in such a manner as to<br />
prevent sediment-laden water from entering the inlet under or around the geotextile.<br />
Third Edition <strong>Stormwater</strong> <strong>Standards</strong> <strong>Manual</strong> September 2008 Page 171
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