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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
Asphalt parking lotLandscaping/turfBest management practiceRetention basinGeneral flow pathOutlet to Malletts Creek
North
#
ProjectLocation
Site Plan
Green roof planted with sedum, spring 2004; sufficient
vegetative cover in ~1 year
roofdrain
Overflow (water not intercepted by green
roof) drains to ground
Overflow (water not intercepted by green
roof) drains to ground
Runoff from asphalt parking lot drains to…
…Bioswales, planted with goldenrod, blazing star,
dogbane, iris, etc., to provide infiltration
East
bioswale
Bioswale inlet lined with
gravel to slowwater
velocity
Notesedimentaccumulation
East
bioswale
Parkinglot inlet
Parkinglot
inlet
Eastbioswale
Wes
t
bios
wale
Westbioswale
Rock-lined channel to retention basin
Overflow outlet
Eastbioswale
Parking lot outlet to retention basin via rock-lined channel
Parking lot outlet to retention basin via rock-lined channel
Flow into upper retention basin
Retention basin—final BMP in storm water treatment train
Flow into lower retention basin
Retention basin—final BMP in storm water treatment train
Outlet toMalletts Creek
Retention basin—final BMP in storm water treatment train
Overflow
Curbmarkers
Curbmarkers
Curbmarkers
Sampling todeterminepollutant removal
Samplingdevice inlet