Lawrence Technological University (LTU) is leading a collaboration of industry and academic partners in a multi-state demonstration project featuring the implementation of an innovative and scalable integrated drainage design that significantly mitigates polluted parking lot stormwater runoff. An integrated systems based approach for capturing and cleansing stormwater runoff is critical for protecting our Nations’ water resources and reducing human health concerns associated with combined sewer overflow (CSO) events in urban areas. An issue exacerbated by climate change which is bringing increased storm intensity and periling cities ability to manage stormwater and maintain water quality.

The integrated drainage system includes three separate 
patented technologies combined in a novel approach including a porous pavement surface (parking performance maintained), an underground engineered soil storage reservoir (for stormwater storage and water quality filtration) and an innovative drainage technology (to improve infiltration and reduce runoff). The integrated drainage system can replace 2.5 percent of the total parking lot impervious surface area and capture 90% of all rainfall events. After five installations (Michigan, Ohio, Florida, California, and Washington DC) and subsequent performance monitoring, Lawrence Tech expects to establish a national design protocol for advancing this novel integrated drainage system with a goal of improving water quality through innovation and regional technology transfer.

LTU Parking

How does it work?

From the surface the project looks similar to a traditional parking lot, but the typical drainage system has been replaced. The top layer of the system is about the size of two parking spots and is covered in a type of porous pavement called Xeripave. Under the Xeripave is a six-foot deep excavation (20 ft x 25 ft) that has been filled with haydite stone to store up to an inch of rain. Underneath the layer of stone are Parjana EGRPs. The EGRPs balance soil moisture and facilitate water movement between horizontal soil layers. 

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In the News - Parjana and LTU

LTU will test innovative drainage system for parking lots
LTU News

LTU and Parjana create green parking lot with integrated technology
C and G News - December 21, 2015

Parjana, Lawrence Tech collaborate on drainage project
Crain's - December 17, 2015

ESD Tech Century - December 14, 2015

Lawrence Tech hopes to set new national standard for stormwater management with innovative pilot
Southeast Michigan Start Up - December 11, 2015

Lawrence Tech hopes to set new national standard for stormwater management with innovative pilot
Metromode - December 10, 2015

Lawrence Tech to Pilot New Parking Lot Drainage System by Detroit-based Parjana
D Business - December 8, 2015

Turning soggy to sunny is Parjana's mission
Detroit Free Press - June 27, 2015

Solving One of the World's Biggest Problems
Forbes - May 23, 2015

Protecting watersheds through innovative drainage
Worldwater Stormwater Management - February/March 2015