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Open vegetated swale materials specifications.
Link to this table
Parameter | Specification | Size | Note | Design application |
---|---|---|---|---|
Dry swale soil | USCS; ML, SM, SC | n/a | soil with a higher percent organic content is preferred | dry swale, step pool |
Dry swale sand | ASTM C-33 fine aggregate concrete sand | 0.02” to 0.04” | dry swale, step pool | |
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 | dry swale, wet swale, step pool |
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 | dry swale, wet swale, step pool |
Filter Strip sand/gravel pervious berm | sand: per dry swale sand gravel; AASHTO M-43 | sand: 0.02” to 0.04” gravel: 1/2” to 1” | Mix with approximately 25% loam soil to support grass cover crop; see Bioretention planting soil notes for more detail | dry swale, step pool |
Pea gravel diaphragm and curtain drain | ASTM D 448 | varies (No. 6) or (1/8” to 3/8”) | use clean bank-run gravel | dry swale, step pool |
Underdrain gravel | per pre-cast manufacturer | 1.5” to 3.5” | dry swale, step pool | |
Underdrain | ASTM D-1785 or AASHTO M-278 | 6” rigid Schedule 40 PVC | 3/8” perf. @ 6” o.c.; 4 holes per row | dry swale, step pool |
Rip rap | per local criteria | size per requirements based on 10- year design flow | dry swale, wet swale, step pool | |