The following features may be added to a rainwater storage system to meet specific needs.

First Flush Device- As Tucson receives its rainfall in two distinct seasons, the first winter and first summer rains will contain the majority of roof dust and sediment. To ensure cleaner water entering your tank, a first flush pipe receives the first 5-15 gallons roof runoff when the water is dirtiest. A ball valve installed at the base of the pipe allows the user to "flush" this water after the first rain of the season. Approximate added cost: $200

Case Studies: The Nature Conservancy

Municipal Water Backup- If a cistern is the only water source for any automatic system, a backup mechanism is installed on the cistern to provide supplemental municipal water when the cistern level is low. This mechanism consists of a float which triggers a valve connected to municipal water supply to open when rainwater runs low, and ensures that an automatic system continues to run without maintenance. Approximate added cost: $800

Filtration for Potable Use- With the addition of UV and carbon filters, a pressurized cistern sized to meet household water needs can be plumbed to provide potable indoor water supply. Approximate added cost: $2,500

Screening Trellis- A 6x6" steel mesh trellis for climbing vines surrounding a cistern provides an aesthetic way to store rainwater in high visibility areas. Approximate added cost: $400

Case Studies: Burns Wald-Hopkins Shambach Architects

Painted Cistern- Both culvert and polyethylene cisterns can be painted the color of your choice. Approximate added cost: $300

Tank Gauge- This gauge floats just outside your tank at the current water level. Approximate added cost: $100

Case Studies: Durham Residence