Changes

[[File:Level spreader diagram.jpg|thumb|Diagram from Wikimedia commons. Credit: U.S. Army Corps of Engineers, Construction Engineering Research Laboratory]]

[[File:Level spreader diagram.jpg|thumb|Diagram from Wikimedia commons. Credit: U.S. Army Corps of Engineers, Construction Engineering Research Laboratory]]

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]], [[swales]] or forested conservation areas<ref>Hathaway, J. M., & Hunt, W. F. (2006). Level Spreaders : Overview , Design , and Maintenance.</ref>.

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]], [[Bioretention|bioretention]], [[swales]] or forested conservation areas<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:

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;

* 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.