Storm Water - Low Impact Development (LID) Recommended Practices and Details

POST-CONSTRUCTION INLET PROTECTION/FILTERS

Brief Description

The Post-Construction Inlet Protection BMP/Filter provides a permanent method of removal of some pollutants for any storm drain inlet.  This system will capture and collect some pollutants, according to the filter design, before they enter the stormwater conveyance system.

Cost Range

Construction:   $$

O&M:  $$

Ideal Conditions for Installation

Precipitation:  All

Soils:  N/A

Groundwater:  N/A

Where/Applicability

Residential:   Yes

Commercial:   Yes

Ultra Urban:  Yes

Industrial:  Yes

Highway/Road:   Yes

Retrofit:  Yes

Feasible:  Most inlets

Maintenance

Frequency:  Quarterly or depending on the stormwater pollutant type and loading

Type:   Vacuuming, emptying or replacement

Monitoring:  Quarterly inspections or as needed 

Permit Renewal:  N/A

Performance

Total Suspended Solids (TSS):   82% to 99%

Chloride:  N/A

Total Nitrogen:  N/A

Metals:  Possible depending on the filter design and particle size

Oils and Grease:   Up to 96% with Add-on

Pathogens:  N/A

Specifications

1. Install at inlets downgradient of areas disturbed by construction activities.  Provide protection for both sides of street.

2. Use only drop-down bag style inlet protection (minimum 12" bag depth).

3. Do not use sand/gravel bags or grate wrap style inlet protections.

4. Use only inlet protection that is made of a material that will allow water to pass through while filtering out coarse and fine sediment at a 99% removal rate.  Filter bag material must be able to pass a minimum of 20 gallons per minute.

5. Provide maintenance per manufacturer's recommendations.

Construction Sequence

N/A

Design Standard

Cross section

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