Grant Application Photos

Photograph(s) of your site. Please include the following:

(1) Show exact future location(s) of your rainscaping feature(s) (we must be able to see what is currently in the location where you intend to add a rainscaping feature);

(2) Show proximity of the feature(s) to the street;

(3) Include descriptive labels on all photos;

(4) Include aerial photograph or aerial satellite image from Google Maps;

(5) Loose photos must be attached to an 8½” × 11” piece of paper. 

Percolation Test

Percolation tests are crucial for determinging the suitability of a site for a rain garden.  If the soil does not drainwell, the garden may become waterlogged and harm the plants.  It also would defeat the purpose of building a rain garden for the City of St. Louis.  Rain gardens rely on the soil's ability to absorb water, prevent runoff, and improve overall quality of water across the landscape.

How to Conduct a Percolation Test:

1. Dig a hole: Dig a hole about 12 inches deep and 12 inches wide.

2. Add water: Fill the hole with water.

3. Measure drainage: Record the time it takes for the water to drain completely.

Interpreting the Results:

• Fast drainage: If the water drains in less than 10 minutes, your soil has good percolation and is suitable for a rain garden.

• Moderate drainage: If the water drains in 10-30 minutes, your soil has moderate percolation and may require amendments to improve drainage.

• Slow drainage: If the water takes longer than 30 minutes to drain, your soil has poor percolation and may not be suitable for a rain garden without significant modifications.

Additional Considerations:

• Soil type: Sandy soils tend to drain faster than clay soils.

• Slope: The slope of your land can affect water runoff and the need for a rain garden.

• Local regulations: Check with your local municipality for any specific regulations or permits related to rain gardens.