Wet swale materials specifications
Open vegetated 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 |