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Stormwater Inlet Grate Survey Considerations

Recording Grate Information Guide to Review Information Needed on Grate Dimensions and Recording it on the Survey Form

All Fabco Industries Water Quality Inserts (WQIs) are manufactured to properly fit inlets by using specific information compiled in a survey of the “as-built” inlet. The Fabco Grate/Inlet Survey form serves as the tool to provide that information.

Recording Grate Information Guide

grate inlet survey guide grate length and width
grate inlet survey guide length and width drawing example

The diameter of a round grate should be entered in the “Grate Length #1” Box.

The length and width of square or rectangular grates should be entered into the appropriate “Grate Length #1” and “Grate Width #2” boxes.

grate inlet survey guide rectangular and round grates
grate inlet survey guide grate type a or b
grate inlet survey guide grate type drawing example

Determine if the grate has a flat (Type A) or ribbed (Type B) bottom, per the sketch to the right of the boxes, and make your selection in the “Grate Style” box.

grate inlet survey guide grate thickness box
grate inlet survey guide grate thickness drawing example

Record the thickness of the grate only into the “Grate Thickness #3” Box.

grate inlet survey guide box 3 example
grate inlet survey guide distance to taper length and width
grate inlet survey guide tapered distance drawing example

Record the distance of the beginning of the grate rib taper from each direction in the “Distance to Taper #4” Box.

grate inlet survey guide distance to taper length

Distance to Taper Length

grate inlet survey guide distance to taper width

Distance to Taper Width

grate inlet survey guide grate rib thickness
grate inlet survey guide distance to taper drawing example

Record the thickness of the grate rib only into the “Thicnkess of Grate Rib #5” Box. DO NOT include the thickness of the grate in this measurement.

recording grate information guide

Contractors Note:

Grates are usually foundry manufactured. Providing cut sheets for the actual grate purchased for the target inlets can help determine and verify details of the grates – please include any grate documentation along with the submitted survey forms.

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