Rainwater StudioSitewater

Design Smarter Rainwater Systems.

See what your roof can collect, how it compares with the water you use, and what a practical rainwater system could do for your property.

Choose the Level of Planning You Need.

Start with a free rainwater assessment. When you are ready to explore tank size and daily performance, continue to Rainwater Tank Sizing.

Free Rainwater Assessment

Start with a project-specific assessment of rainwater collection, other supported site water sources, and water demand. See how supply and demand compare annually and through the year, and identify practical next steps.

  • Free annual potential and demand estimate
  • Roof collection areas, water uses, and alternative sources
  • Clear next steps for improving the opportunity
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Next level

Rainwater Tank Sizing

Go beyond annual potential and compare practical tank sizes using historical daily weather and the timing of project water uses.

Illustrative planning result3,500 gal

Recommended usable storage

Explore Tank Sizing

Available with an access code after your free assessment.

How It Works

Define Water Sources

  • Trace collection areas or enter known areas
  • Add supported alternative water sources and their availability
  • Automatically load historical weather data based on project location
  • Upload custom weather data for advanced analysis
Map and edit collection areas directly on aerial imagery.

Estimate Water Uses

  • Estimate toilet flushing, laundry, and water-feature refill
  • Add custom uses with their amount and timing
  • Map landscape zones and describe planting and irrigation
  • Use irrigation schedules, bills, or known amounts
  • Account for seasonal operation and rain shutoff
Map landscape zones and describe planting and irrigation.

Review the Rainwater Opportunity

  • Compare annual and monthly supply with demand
  • See seasonal differences in collection and water use
  • Get practical recommendations based on the results
Compare potential inflow with selected water uses.

Need to Size Storage?

Explore the Next Level of Storage Planning

  • Compare practical tank sizes using historical weather
  • See how much demand each size can serve
  • Review backup water, overflow, and year-to-year performance
  • Understand why the recommended size was selected
  • Evaluate optional fire-reserve storage where applicable
  • Evaluate different tank and cistern configurations that could meet the overall storage goal
Explore Rainwater Tank Sizing →
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Start my free water assessment