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The length of the level spreader should be determined by the design storm inflow rate and type of landscape downstream:
 
The length of the level spreader should be determined by the design storm inflow rate and type of landscape downstream:
* 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;
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* 1.4 m of level spreader length per every 0.01 m³/s of inflow when draining 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.
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* 4.3 m of level spreader length per every 0.01 m³/s of inflow when draining 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.
 
* The level spreader lip should be concrete, wood or pre-fabricated metal.
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* The depth should be the greater of 200 mm or half the inflow pipe diameter.
 
* The depth should be the greater of 200 mm or half the inflow pipe diameter.
 
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[[Category:Pretreatment]]

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