Wet swale materials specifications.
Link to this table
|Check dam (pressure treated)||AWPA Standard C6||6” by 6” or 8” by 8”||do not coat with creosote; embed at least 3’ into side slopes|
|Check Dam (natural wood)||Black Locust, Red Mulberry, Cedars, Catalpa, White Oak, Chestnut Oak, Black Walnut||6” to 12” diameter; notch as necessary||do not use the following, as these species have a predisposition towards rot: Ash, Beech, Birch, Elm, Hackberry, Hemlock, Hickories, Maples, Red and Black Oak, Pines, Poplar, Spruce, Sweetgum, Willow|
|Check dam (rock, rip rap)||Per local criteria||Size per requirements based on 10-year design flow||Cannot get water quality volume credit when using a permeable check dam|
|Check dam (earth)||Per local criteria||Size per requirements based on 10-year design flow||Use clayey soils with low permeability|
|Check dam (precast concrete)||Per pre-cast manufacturer||Size per requirements based on 10-year design flow||Testing of pre-cast concrete required: 28 day strength and slump test; all concrete design (cast-in-place or pre-cast) not using previously approved State or local standards requires design drawings sealed and approved by a licensed professional structural engineer.
Embed at least 3’ into side slopes