A New Norris House / Water Use Strategies

The New Norris House employs smart, easy solutions for baseline water use reductions such as a 100% native, water-wise landscape, and the use of low-flow fixtures. Further reductions are accomplished through the design and installation of a rainwater collection system, as well as a series of greywater infiltration beds. For extended information about installed systems, see “Systems and Equipment Page”.

The site is 99% permeable and collected roof water is treated for non-potable use. A primary cistern overflows to a 2nd cistern, for garden irrigation, which overflows to bio-retention beds. Each bed holds 2.5” of water before overflow to a swale. Grey water is discharged below ground to the top retention bed for treatment and infiltration. Temporary permits and ordinance revisions were developed in conjunction with theTennessee Department of Environment and Conservation, as well as the City of Norris Water Commission, and were granted around a 2-year research and monitoring program.

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Selected Findings
Percentage of precipitation managed on-site: 99%
Percentage of waste water reused on-site: 73%*
Measured annual regulated potable water use: 19.3 gal/sf/year**
Percentage regulated potable water reduction from baseline: 61.6%***

* Based on 12.6 gallons/capita/day use of toilet (8.2gal) and kitchen faucet (5.4gal), which are plumbed to sanitary sewer.
** Based on 1008sf. Potable water use has been logged and measured for 1 year as part of quantitative evaluation efforts.
*** Based on 1999 AWWA “Residential end Uses of Waer” Report of 69.3 gallons/capita/day indoor use.