Difference between revisions of "Freeboard"

Latest revision as of 00:48, 7 June 2022

In swales conveying flowing water a freeboard of 300 mm is generally accepted as a good starting point.
In bioretention the freeboard is the difference between the invert elevation of the inlet and overflow structure. 150 mm will usually suffice, so long as the inlet will not become inundated during design storm conditions.
In above grade stormwater planters, the equivalent dimension would be the difference between the invert elevation of the lip of the planter and the overflow structure (150 mm minimum).

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-*In [[swales]] convey flowing water a freeboard of 300 mm is generally accepted as a good starting point.
+*In [[swales]] conveying flowing water a freeboard of 300 mm is generally accepted as a good starting point.
-*In [[bioretention]] the freeboard is being defined as the depth between the invert of the [[overflow]] and the the [[inlet]] 150 mm would suffice, so long as the inlet will not become inundated during design storm conditions.
+*In [[bioretention]] the freeboard is the difference between the invert elevation of the [[inlet]] and [[overflow]] structure. 150 mm will usually suffice, so long as the inlet will not become inundated during design storm conditions.
-*In above grade [[stormwater planters]], the equivalent dimension would be the depth between the invert of the overflow and the lip of the planter (150 mm minimum)
+*In above grade [[stormwater planters]], the equivalent dimension would be the difference between the invert elevation of the lip of the planter and the [[overflow]] structure (150 mm minimum).
-*Where the stormwater planter is configured more like a lined/non-infiltrating bioretention system, the inlet will be the depth to which this is measured, as above (150 mm minimum).