Changes

The length of the level spreader should be determined by the type of filter area and the design flow:

The length of the level spreader should be determined by the type of filter area and the design flow:

* 1.4 m of level spreader length per every 0.01 m³/s of inflow for discharges to a [[vegetated filter strips|vegetated filter strip]] or grassed area;

* 1.4 m of level spreader length per every 0.01 m³/s of inflow for discharges to a [[vegetated filter strips|vegetated filter strip]], [[Bioretention| bioretention]], [[Swale| swale]] or grassed area;

* 4.3 m of level spreader length per every 0.01 m³/s of inflow when the spreader discharges to a forested conservation area.

* 4.3 m of level spreader length per every 0.01 m³/s of inflow when the spreader discharges to a forested conservation area.

* The minimum level spreader length is 4 m and the maximum is 40 m.

* The minimum level spreader length is 4 m and the maximum is 40 m.

* The level spreader lip should be concrete, wood or pre-fabricated metal, with a well anchored footer, or other accepted rigid, non-erodible material.

* The level spreader lip should be concrete, wood or pre-fabricated metal.

* The ends of the level spreader section should be tied back into the slope to avoid [[overflow]] scouring or erosion around the ends of the spreader.

* The ends of the level spreader section should be tied back into the slope to avoid [[overflow]] scouring or erosion around the ends.

* Where relevant, the width of the level spreader channel on the up-stream side of the level lip should be three times the diameter of the inflow pipe, and the depth should be 20 cm or one-half the culvert diameter, whichever is greater.

* The width of the level spreader should be the greater of 300 mm or three times the diameter of the inflow pipe.

* The depth should be the greater of 200 mm or half the inflow pipe diameter.

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