Level 1 Project Plan
Simple (Passive) Rainwater Harvesting Systems:
Collection – roof, patio, sidewalks
Distribution System – gutters and downspouts, channels, ditches, swales
Landscape Holding Area – concave depressions, the addition of berms, moats, or soil terracing
Step #1. Site Plan:
- Draw site to scale and include dimensions.
- Show direction of water flow off roof tops and landscapes with arrows.
- Where are the high points/ridge lines? (Indicate with a + sign.)
- Where are the low points/outlets? (Indicate with a - sign.)
- Determine catchments.
- Identify areas that require irrigation.
- Label surface areas of hardscapes and landscapes, identified rainwater practice(s), and associated potential storage volume.
Step #2. Site Analysis:
- Assess site conditions to determine rainwater harvesting goals.
- If harvesting rainwater from a roof, extend gutter/downspouts to reach planted areas or provide a path.
- Take advantage of hardscapes to catch water and redistribute to planted areas.
- Soil can also serve as a catchment by grading the surface to increase and direct runoff.
- Strive for zero runoff with no rain or irrigation water allowed to run off your property.
Step #3. Design Landscape Holding Areas:
- How can we slow the flow of water?
- Locate and size landscape holding areas.
- Locate landscape depressions that can hold water.
- Create new depressions where you want to locate plants.
- Construct berms or moats.
- Connect several holding areas with spillways or channels to distribute water throughout the site.
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