Minnesota Water Resources Conference - Water Resources Center ...

Concurrent Sessions III 3:15–4:45
Track A: Low Impact Development
BOOK OF ABSTRACTS
Tuesday, Monday, October 27 23
Amery Regional Medical Center—A Rural LID Precedent
Kevin Biehn, Amery Regional Medical Center, kbiehn@eorinc.com
The initial site plan for the Amery Regional Medical Center (ARMC) was traditional in the basic sense. After exposure
to low-impact development (LID) principals and benefits the ARMC resolved mid-stream to provide a facility that
would promote human health and wellness through an ecologically enhancing environment.
The refocused objective of the ARMC site plan was to create a synergy between the hospital, the Apple River and
the greater Amery community. Highlights of the plan include: ¾ of an acre of filtration and infiltration bioretention
facilities, environmental education, porous fire access lane, ½ acre green roof, erection of a raptor nest, prairie
restoration, trail system and an overlook of the Apple River.
Extensive water quality and quantity management surpasses both Polk County and WDNR NR-151 requirements.
Peak discharge rates and total runoff volumes in post developed conditions will not exceed pre-development
peak discharge rates and total runoff volumes for the 2-year and 100-year storm events. A 95% reduction in total
suspended solids is estimated for post-developed conditions.
Project construction began in the spring 2006 and the hospital opened their doors in October 2007. Even prior to
completion this project has become an LID precedent for rural Wisconsin and outstate Minnesota.
Presentation will feature the accomplishments discussed above; design challenges; construction sequencing to
protect the integrity of the infiltration facilities; and a post occupancy evaluation.
Low Impact Stormwater Management- Lessons Learned
Jessica Collin-Pilarski, Ayres Associates, Collin-PilarskiJ@AyresAssociates.com; Daniel Bigalke, Ayres Associates
Tii Gavo is a Low Impact Development (LID) located near Scandia, Minnesota on the shore of Big Marine Lake.
This 160 acre development includes the 20-acre Rasmussen Pond, numerous wetlands, native prairie grasses
and an abundance of heritage trees. As an LID the stormwater management plan calls for infiltration basins,
grass swales, rain gardens and other techniques that mimic nature and promote groundwater recharge. In
the fall of 2007 excessive rainfall amounts during construction caused an increase in erosion. The perimeter
controls kept Big Marine Lake and Rasmussen Pond from being affected, but there was extensive sedimentation
damage in areas preserved for LID stormwater facilities. This presentation discusses the contractor’s
responsibility in implementing the SWPPP; actions taken to rehabilitate the proposed LID stormwater facilities;
and measures that are necessary to prevent this type of damage from occurring in the future.
Minnesota Water Resources Conference, October 27–28, 20078 30