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Created page with "Level spreaders should conform to the following design criteria in order to ensure non-erosive sheet flow into vegetated areas such as vegetated filter strips or swales..."
Level spreaders should conform to the following design criteria in order to ensure non-erosive sheet flow into vegetated areas such as [[vegetated filter strips]] or [[swales]]. <ref>Hathaway, J. M., & Hunt, W. F. (2006). Level Spreaders : Overview , Design , and Maintenance.</ref>.
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 cubic meter per second (cms) of inflow for discharges to a filter strip or turf conservation area;
* 4.3 m of level spreader length per every 0.01 cms 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 level spreader lip should be concrete, wood or pre-fabricated metal, with a well anchored footer, or other accepted rigid, non-erodible material.
* The ends of the level spreader section should be tied back into the slope to avoid scouring around the ends of the level spreader; otherwise, short-circuiting of the facility could create erosion.
* 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.
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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 cubic meter per second (cms) of inflow for discharges to a filter strip or turf conservation area;
* 4.3 m of level spreader length per every 0.01 cms 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 level spreader lip should be concrete, wood or pre-fabricated metal, with a well anchored footer, or other accepted rigid, non-erodible material.
* The ends of the level spreader section should be tied back into the slope to avoid scouring around the ends of the level spreader; otherwise, short-circuiting of the facility could create erosion.
* 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.
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