Rainscaping for watershed restoration

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Presentation transcript:

Rainscaping for watershed restoration Neil Gilbert Andrea lubberts Michael ryskamp

Quizbowl What is a watershed? Plaster Creek runs directly into Lake Michigan (T/F?). An area of land that “drains” to a common point. All of the “stream’s land.”

Quizbowl Why does Plaster Creek turn brown after it rains? Why does the Rogue River turn less brown than Plaster Creek after a rain storm?

About 50% of the watershed

Quizbowl If you took a sample of water from Plaster Creek, what would you find in it (besides water)? What makes the water in Plaster Creek unsafe for human contact? About how much sediment flows through Plaster Creek each year?

Quizbowl How do urban landscapes alter the natural water cycle? Where does the water go after it enters a storm drain?

Two different stormwater stories…. Stream channel Groundwater

Interception Evaporation What happens when it rains? The slow and steady story Interception Evaporation Stream channel Groundwater

Transpiration (plants) Groundwater storage Groundwater discharge What happens when it rains? The slow and steady story Interception Evaporation Infiltration Transpiration (plants) Groundwater storage Groundwater discharge (Surface Runoff) Stream channel Groundwater

Transpiration (plants) Groundwater storage Groundwater discharge What happens when it rains? The slow and steady story Interception Evaporation Infiltration Transpiration (plants) Groundwater storage Groundwater discharge (Surface Runoff) Stream channel Groundwater

What happens when it rains? The quick and dirty story… Stream channel Groundwater

What happens when it rains? The quick and dirty story… Stream channel Groundwater

What happens when it rains? The quick and dirty story… Stream channel Groundwater

` What happens when it rains? The quick and dirty story… Stream channel Groundwater

What happens when it rains? The quick and dirty story… Stream channel Groundwater

Quizbowl Give three examples of Green Infrastructure (GI). Do you know of any Green Infrastructures in Grand Rapids? What proportion of urban streams in the US are degraded? How are these two questions related?

How is Green infrastructure a paradigm shift?

Green vs Gray Entire watershed Tc (existing/developed) = 2.0 / 0.5 hrs Area = 37,120 ac Existing = Meadow, B (CN = 58) Developed = Impervious (5%), open space - good (95%), B (CN = 61) Bioretention = 23,000 cf Runoff volumes: Developed (area under green/red curve) = 44.9 million cft Pre-development (under blue curve) = 21.3 million cft Difference (what we’d like to capture) = 23.6 million cft

Rain Gardens are designed to capture and clean stormwater! A model rain garden And use native plants! Keep it in full sun! (or in well draining soils) Keep it 10’ from foundation Avoid putting your rain garden in the “soggy bottom” areas of your yard (that spot that’s always wet)…