Rainscaping as Stormwater Solutions

This video of both a rock garden and a rain garden was taken outside city hall in Pleasant Hill, Iowa. Stormwater runoff can push sediments and chemical contaminants from human activity into stormwater drains and eventually rivers and streams. Rainscaping is a way to reduce the impact of stormwater runoff especially in concrete laden cities. The plants’ roots within the rain gardens help filter the stormwater runoff of pollutants. Although many of these projects are funded by community organizations, several criteria including soil conditions, material costs, types of vegetation/garden, and maintenance must be considered in the planning of these types of projects. 

• How does rainscaping affect stormwater runoff? 

• What social, cultural, and environmental impacts can be foreseen with a rainscaping project?

Students could:

• Design and conduct an investigation to test which plants would filter stormwater the best. 
• Determine the criteria and constraints to use in designing a rainscape. 
• Design a specific rain garden for their schoolyard or somewhere in their community.  
• Estimate the stormwater runoff from their rain garden designs.  
• Evaluate and refine the design of rain scapes in their communities. 
• Describe the environmental impacts of their design. 

• Iowa Stormwater Education Partnership | Rain Gardens: Rainscaping basics including project ideas and funding opportunities. 
• Mind Tools | Decision Matrix Analysis: An example of a Pugh matrix (engineering matrix) students could use to evaluate a rainscape or specific plants.