A 2,000 square foot house in Hillsboro, where annual rainfall averages 38 inches, will have a roof rainwater runoff of 47,500 gallons annually. That is a lot of water, and even more may be running off of barns and larger building roofs.
Collecting rainwater from the roof of your home, barn, or greenhouse during the winter is a great way to save water for use in the drier summer months. This water can be used for both potable and non-potable uses.
Benefits of Rainwater Harvesting
- Helps conserve water resources.
- Can reduce the impact of droughts in late summer and early fall.
- Can help protect ground and surface water quality. creases ground water level.
- Can reduce runoff and help keep storm drains & roads from flooding.
- Reduced runoff can also reduce soil erosion.
- May reduce water and electricity bills, depending on your setup.
What to Consider
- How much water will my roof generate? Am I creating adequate capacity to store that much water? If not, where will the excess water go throughout the year?
- Will I harvest enough water for my garden, crops or other use? If not, how will I supplement this supply?
- Will my water be safe to drink and to apply to my vegetable garden? (Is my roof made of safe materials and free from debris? Will I need a purification system?)
- If not, what other uses can it be put to: flushing toilets, washing clothes, watering the lawn?
- What state and local laws may apply?
- Regional Water Providers Consortium – What to know about rain barrels in the Metro area
- Clackamas Soil and Water Conservation District
- Portland Purple Water
- American Rainwater Catchment Systems Association
- “Texas Guide to Rainwater Harvesting”
- Oregon Rainwater Harvesting Manual