Rainscaping Iowa’s Landscapes · Rainscaping Iowa’s Landscapes ... Bioswales – enhanced rain...
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Transcript of Rainscaping Iowa’s Landscapes · Rainscaping Iowa’s Landscapes ... Bioswales – enhanced rain...
Rainscaping Iowa’s Landscapes
Wayne Petersen, Urban Conservationist,Iowa Dept of Agriculture and Land Stewardship
Need green infrastructure throughout the watershed of wet detention ponds
D.A. = 48. 3 acresResidential = 34 acAg = 14. 3 acP. Surface= 2.4 ac
Practices / Projects throughout Iowa
» Green Roofs» Rainwater Harvesting» Soil Quality Restoration» Porous Pavement » Bioretention» Stream Corridor Stabilization
IDALS’s Urban Conservation Program
Amy Bouska,
Jennifer Welch
Wayne Petersen
Two UC positions are currently open.
Rich Maaske, from Council Bluffs, recently retired.
Steve Anderson, from Spirit Lake recently accepted a new position.
We hope to fill one position.
One will not be filled.
Need support for UC funding
6,000 gal tank capturing roof water for greenhouse use at Kirkwood Community College in Cedar Rapids
A rain barrel capturing roof runoff and overflowing into a rain garden. Permeable pavers round out this system in West Union that manages roof runoff.
A curb cut lets street water flow onto a vegetative filter strip and then into this biocell
Summerbrook Park - Ankeny
Bioswales infiltrate the WQv and convey runoff from larger events
Before – gully erosion and wetness problems
» De-compaction» Apply compost to increase OM
content» Strive for Five (5% OM content
minimum)
Soil Quality Restoration
Aerate prior to compost application to create macro-pores.
Existing yards
Applyingcompostafteraeration to increase OM content
The neighbor’s untreated yard
Yard with fall applied
soil quality restoration
Early the following spring
Flood plain of Catfish Creek in DubuqueCounty after 14 inches of rain fell overnightin late July 2011. Note the high water makr
Note how this outside bend of Catfish Creek held up during the high stress of this flash flood. Banks had been slopedback and vegetated with deep rooted native plants.
Overflow pipe is elevated but perforated. Riser pipesMust be non-perforated to Impound at least 6-9 inches