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Ann Arbor District LibraryGreen Roof and Infiltration BMPs
• Current MDEQ nonpoint source (NPS) program priority: innovative, low-impact storm water BMPs
• In August 2003, Library received $236,000 federal Section 319 NPS grant
• First green roof funded by MDEQ NPS program
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Asphalt parking lotLandscaping/turfBest management practiceRetention basinGeneral flow pathOutlet to Malletts Creek
North
#
ProjectLocation
Site Plan
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Green roof planted with sedum, spring 2004; sufficient
vegetative cover in ~1 year
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roofdrain
Overflow (water not intercepted by green
roof) drains to ground
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Overflow (water not intercepted by green
roof) drains to ground
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Runoff from asphalt parking lot drains to…
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…Bioswales, planted with goldenrod, blazing star,
dogbane, iris, etc., to provide infiltration
East
bioswale
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Bioswale inlet lined with
gravel to slowwater
velocity
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Notesedimentaccumulation
East
bioswale
Parkinglot inlet
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Parkinglot
inlet
Eastbioswale
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Wes
t
bios
wale
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Westbioswale
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Rock-lined channel to retention basin
Overflow outlet
Eastbioswale
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Parking lot outlet to retention basin via rock-lined channel
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Parking lot outlet to retention basin via rock-lined channel
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Flow into upper retention basin
Retention basin—final BMP in storm water treatment train
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Flow into lower retention basin
Retention basin—final BMP in storm water treatment train
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Outlet toMalletts Creek
Retention basin—final BMP in storm water treatment train
Overflow
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Curbmarkers
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Curbmarkers
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Curbmarkers
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Sampling todeterminepollutant removal
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Samplingdevice inlet