NonStructural

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Non-Structural Green Technology BMPChallenges in
Sussex County
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Bioswales

• Hydraulic Design Criteria
• Swale Sizing Criteria
• Routing
• DURMM (Delaware Urban Runoff Management Model)
• TR20 routing (Mannings equation)
• Vegetation

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Hydraulic Design Criteria
Drainage Area No Minimum 20 acres Maximum
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Hydraulic Design Criteria
Drainage Area No Minimum 20 acres
Maximum Residence Time 9 minutes minimum
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Depth of flow
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Flow Velocity
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Swale Sizing Criteria
Side Slope
Bottom width
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Minimum slope 0.5 ft/ft
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Delaware Urban Runoff Management Model DURMM
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Delaware Urban Runoff Management Model DURMM
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Delaware Urban Runoff Management Model DURMM
Removal Efficiency
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Delaware Urban Runoff Management Model DURMM
Residence time
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Delaware Urban Runoff Management Model DURMM
Depth of Flow
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Delaware Urban Runoff Management Model DURMM
Velocity
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Delaware Urban Runoff Management Model DURMM
100 year storm swale velocity
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Delaware Urban Runoff Management Model DURMM
100 year storm swale flow depth
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TR20 Routing HydroCAD node diagram
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Mannings Equation at normal depth with free
discharge
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Mannings Equation at normal depth with free
discharge
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Mannings Equation at normal depth with free
discharge
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Mannings Equation at normal depth with free
discharge
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Mannings Equation at normal depth with free
discharge
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• Level Spreader

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Key S Slightly Tolerant         M
Moderately Tolerant         V Very Tolerant
http//pinelandsnursery.com/herb.htm
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• Wet tolerant seed mix 9 from Delaware E and S
  handbook

• Common Threesquare planted on 2 sqft. Pattern
• (Scirpus Americanus)

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Suggestive wet tolerant bio-swale plantings

• Grasses and Grasslike Plants
• Carex stricta tussock sedge
• Festuca rubra red fescue (turf)
• Panicum virgatum Virginia switchgrass
• Tripsacum dactyloides gama grass
• Agrostis alba redtop
• Agrostis stolonifera creeping bentgrass
• Elymus virginicus Virginia wild rye
• Carex vulpinoidea Fox sedge
• Puccinellia distans Alkali grass

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Filter Strips

• Hydraulic Design Criteria
• Spatial Sizing Criteria
• Routing
• DURMM (Delaware Urban Runoff Management Model)
• Vegetation

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Hydraulic Design Criteria

• Impervious flow length no minimum
• 100 feet - maximum

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Hydraulic Design Criteria

• Impervious flow length no minimum
• 100 feet - maximum
• Hydraulic loading rate 15 cf/lin.ft(-)
  preferred
• 30 cf/lin.ft maximum
• (Water quality volume/length of filter strip)

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5 ft. minimum No maximum
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Filter slope 1 minimum 25 maximum
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Filter StripDURMM
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Bioretention Basin

• Hydraulic Design Criteria
• Spatial Sizing Criteria
• Routing
• DURMM (Delaware Urban Runoff Management Model)
• Vegetation

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Hydraulic Design Criteria

• Drainage area no minimum
• 10 acres maximum

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Hydraulic Design Criteria

• Drainage area no minimum
• 10 acres maximum
• Drawdown time no minimum
• 36 hour maximum after hydrograph peak

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Hydraulic Design Criteria

• Drainage area no minimum
• 10 acres maximum
• Drawdown time no minimum
• 36 hour maximum after hydrograph peak
• Hydraulic loading depth no minimum
• 18 w/ infiltration
• 33 w/ underdrain

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Spatial Design Criteria

• Media Depth 3 feet standard
• 4 feet maximum

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Spatial Design Criteria

• Media Depth 3 feet standard
• 4 feet maximum
• Basin length 20 feet minimum values
  are
• 100 feet maximum recommendations

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Spatial Design Criteria

• Media Depth 3 feet standard
• 4 feet maximum
• Basin length 20 feet minimum values
  are
• 100 feet maximum recommendations
• Basin width 4 feet minimum 20 feet
  maximum or half length at grade
• maximum by reach of excavator unless at grade

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Spatial Design Criteria

• Media Depth 3 feet standard
• 4 feet maximum
• Basin length 20 feet minimum values
  are
• 100 feet maximum recommendations
• Basin width 4 feet minimum 20 feet
  maximum or half length at grade
• maximum by reach of excavator unless at grade
• Side slope 101 minimum
• 31 maximum

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Spatial Design Criteria

• Media Depth 3 feet standard
• 4 feet maximum
• Basin length 20 feet minimum values
  are
• 100 feet maximum recommendations
• Basin width 4 feet minimum 20 feet
  maximum or half length at grade
• (maximum by reach of excavator unless at
  grade)
• Side slope 101 minimum
• 31 maximum
• Depth to SHWT 3.0 feet minimum
• No maximum

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TR-20 Bioretention routingHydroCAD
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HydroCAD TR20 Routing
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HydroCAD TR20 Routing
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HydroCAD TR20 Routing
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DURMMBio-retention routing
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DNREC Approved Biosoil Mix Suppliers(Effective
Date 03-11-08)
COR-MAT Products Corrado Construction Company,
LLC Sales Contact Karen Phillips 210 Marsh
Lane New Castle, De 19720 [phone] (302)
655-3942 FAX www.cor-mat.com Kaye
Construction Contact Person Edward J. Kaye 22288
Coverdale Road Seaford, DE 19973 (302)
875-2039 Middletown Materials (A-Del) Contact
Person Ken Monroe 10 Adel Drive Newark, DE
19702 [phone] [phone] Fax

• Select Soils
• Contact Person Abby Sciarra
• PO Box 1037
• 649 West South Street
• Kennett Square, PA 19348
• 800-GET-SOIL
• [phone] Fax
• Moon Nurseries
• Contact Person Mark Bleezarde
• Mailing Address
• Po Box 672
• Chesapeake City, MD 21915
• Physical Address
• 145 Moon Rd
• Chesapeake City, MD 21915
• [phone] Ext 2299
• [phone] Fax

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23818 Shortly road Georgetown, DE 19947 (302)
856-2105 James.Elliott_at_state.de.us www.sussexconse
rvationdistrict.org