Watershed districts
Watershed districts have rules which force parking lots into a green design.

Minnesota Stormwater Manual
Maintained by the MPCA
http://www.pca.state.mn.us/index.php?option=com_k2&view=item&id=993l

EPA Green Parking Lots Resource Guide
http://nepis.epa.gov/Exe/ZyPDF.cgi?Dockey=P100D97A.PDF

Example of a high level green parking lot design
Met Council at the Park and Ride at TH36 and Rice Street
Systems are interconnected:

  • Storm chamber detention vault
  • Swirl chamber
  • Stockholm soil tree vaults
  • Iron filings infiltration pond
  • Interception of storm water for thermal cooling
  • Utilizing trees for parking lot and car cooling

ASLA

ASLA has collected over 450 Green Infrastructure Case studies from communities across the country, including a number of parking lot projects.  Here are all of the case studies:
http://www.asla.org/stormwatercasestudies.aspx

Here are the Minnesota specific case studies including a few parking lot projects:
http://www.asla.org/stormwatercasestudies.aspx#minnesota  

ASLA gave San Mateo County (CA) a Planning Award in 2011 for their Green Streets and Parking Lots Design guide