(Created page with " <center><font size=3>'''Open vegetated swale and filter strip materials specifications'''.</font size><br> Link to this [[Open vegetated swale and filter strip materials spec...") |
m |
||
Line 1: | Line 1: | ||
+ | |||
<center><font size=3>'''Open vegetated swale and filter strip materials specifications'''.</font size><br> | <center><font size=3>'''Open vegetated swale and filter strip materials specifications'''.</font size><br> | ||
Line 34: | Line 35: | ||
</tr> | </tr> | ||
<tr> | <tr> | ||
− | Filter Strip sand/gravel pervious berm</td> | + | <td>Filter Strip sand/gravel pervious berm</td> |
<td> | <td> | ||
sand: per dry swale sand | sand: per dry swale sand |
Parameter | pecification | Size | Notes |
---|---|---|---|
Dry swale soil | USCS; ML, SM, SC | n/a | soil with a higher percent organic content is preferred |
Dry Swale sand | ASTM C-33 fine aggregate concrete sand | 0.02” to 0.04” | |
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 |
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 |
Pea gravel diaphragm and curtain drain | ASTM D 448 | varies (No. 6) or (1/8” to 3/8”) | use clean bank-run gravel |
per pre-cast manufacturer | 1.5” to 3.5” | ||
Under-drain | ASTM D-1785 or AASHTO M-278 | 6” rigid Schedule 40 PVC | 3/8” perf. @ 6” o.c.; 4 holes per row |
Geotextile | See local Standards and Specs | n/a | |
Rip rap | per local criteria | size per equirements based on 10- year design flow |