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Drawing of Marion Dunn Pond
Marion Dunn Pond Dredging/Rehabilitation and Secret Pond Energy Dissipater
– WI DOA/DSF – UW-Madison Arboretum – Madison, WI
The Marion Dunn Pond drains a 260-acre primarily residential watershed. This pond has been the site for numerous studies over
the years to determine pollutant removal rates from detention basins. In fact, it is the pond upon which the Source Loading and
Management Model (SLAMM) was calibrated. Due to its effectiveness at settling out pollutants prior to discharge to Lake Wingra,
this pond had filled with sediment, thus reducing its effectiveness at protecting Lake Wingra and the downstream watershed.
To address these problems, we were hired to design a project that would restore the Marion Dunn Pond’s pollutant removal
efficiency. In addition to these project elements, we also developed a planting plan in conjunction with UW-Madison Arboretum
staff and performed construction observation during the winter 2003/2004 season.
View of Secret Pond Energy Dissipater
Secret Pond Energy Dissipater – Just
west of the Marion Dunn Pond site, the Secret Pond
influent channel received a field stone energy
dissipater to reduce velocities and decrease sediment
loads to Lake Wingra while fitting into the natural
environment. The energy dissipater was designed to
dissipate up to the 10-year storm flows and the field
stone was designed to withstand the 100-year storm
flows.
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Angler's Cove bluffs along Lake
Mendota
Angler’s Cove Prairie Restoration and Energy Dissipater – WI DOA/DSF – UW-Madison Campus
– Madison, WI
Since
Angler's Cove is located on the bluffs along Lake Mendota and drains directly to a prime
walleye and yellow perch spawning grounds, the site recently
became a high priority for restoration and enhancement. This site has
historically been used as an access point by fishermen and as a trailhead
for walking paths traversing the Lake Mendota shoreline. Over the years, the
¾-acre site was paved over and suffered from severe erosion problems along the
Lake Mendota bluff. In addition, the adjacent ravine that provides stormwater
drainage from the Eagle Heights student housing complex had degraded because of high
velocities and was depositing high amounts of sediment to the lake.
To
address these problems, we were hired to complete a design that would convert the paved area back to its
native dry prairie origins and provide an energy
dissipater in the ravine to reduce velocities.
Additional project elements included retaining walls to restore the original bluff character,
a lake access structure constructed of native
environmentally-friendly black locust wood materials to
route pedestrians away from the highly erodible bluff
area, a cut-limestone retaining wall to minimize
disturbance of existing old-growth deciduous trees, and a
gravel parking area. An ADA-compliant limestone
screenings walking path was constructed to route pedestrians along the
top of bluff and from the parking area to the lake
access structure that brings pedestrians down
approximately 20 feet from the top of bluff to the
Angler’s Cove beach.
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