Our Work

Argenta Hills: A Low Impact Development (LID) Project

Development of this 134-acre commercial and residential site faced some unique open space and stormwater management requirements due to the requirements of the NW Area Overlay District of Inver Grove Heights, MN.

The overall stormwater management approach for this site is to maintain the existing hydrology to the extent possible. This is accomplished by infiltrating water near its source using a decentralized stormwater mgmt. system.

This design satisfies the city’s requirement that “at least 20 percent of the buildable development area shall be preserved as natural or open space” and stormwater runoff volumes shall be retained to pre-development volumes for the 5-yr (3.6 inch) 24-hr rainfall event using a treatment train approach.

When the capacity of theses smaller practices are exceeded the excess runoff is routed to larger infiltration basins and existing landlocked regional infiltration facilities. In using this approach, EOR was able to completely contain the runoff from the 100-year (6 inch) 24-hour rainfall event on-site.

Project Benefits:

Reduce city infrastructure costs
Provide for groundwater recharge
Protect sensitive downstream resources
Provide drainage for residential & commercial areas
Provide aesthetic features
Provide functional stormwater features

LID/BMP Techniques Used:

Swales
Filter strips
Raingardens
Biofiltration
Pervious pavement (pavers & asphalt)
Infiltration trenches and basins
Disconnection of impervious surfaces


Interested in learning about LID and BMPs applied to smaller scale project, see EOR's recent work for the 1st Presbyterian Church in Stillwater, MN.


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