Update to NVBIA/NAIOP Regarding Rainwater Harvesting
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Update to NVBIA/NAIOP Regarding Rainwater Harvesting
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Update to NVBIA/NAIOP Regarding Rainwater Harvesting
- 1. A Fairfax County, VA, publication Department of Land Development Services Update to NVBIA/NAIOP regarding rainwater harvesting March 21, 2019
- 2. Rainwater harvesting update • Problem statement: Plumbing code definitions of rainwater restrict harvesting from rooftop collection surfaces most types of reuse. – Example: collection from publicly accessible dog runs or park use on top of a building podium. – Reuse of water for cooling towers is not approvable per code language. 2 • Working solution: Applicant can pursue alternative compliance path via code modification. – Applicant can reference Canadian Standards Association (CSA) – International Code Council (ICC) document . – CSA B805-18/ICC 805-2018 – Includes prescriptive and performance options. – Staff has approved two modifications for developments in Tysons.
- 3. 3 Building Official’s blog update is available here: https://www.fairfaxcounty.gov/landd evelopment/rainwater-harvesting-0
- 4. Additional Information For additional information, please contact www.fairfaxcounty.gov 4 William Marsh 703-324-1972 Wililam.Marsh@fairfaxcounty.gov
Notes de l'éditeur
- For larger commercial and multifamily buildings that may have problems complying with minimum rainwater provisions in the Virginia Plumbing Code, designers may submit a request to utilize this alternative method with their proposed rainwater harvesting system. If designing to the CSA B805-18/ICC 805-2018 standard, the designer must clearly show how the proposed system complies with the requirements of the chosen compliance path defined in the standard.
- It requires 2,300 kilowatt-hours of electricity to pump, treat, transmit and distribute one million gallons of potable water. See note about Cap One Block C below – code modification that was approved ensures that about 4.8 million gallons of potable water demand is deferred, leading to over 11,000 kw-hr of deferred electric demand. Shane Murphy email June 19, 2018: Also, Gordon took a look at the cistern sizing calculations and historical rainfall data. The cisterns affected (all except the McLean 2 building cistern which, as noted, is under the old code) were previously designed to provide approximately 6,500,000 gallons of makeup water per year. Based on the assumed lost areas due to the new code the cisterns would only provide approximately 1,700,000 gallons per year. The delta at the current average Fairfax Water consumption rate equates to an additional $16,400 per year that Capital One would have to pay in water fees due to the new code changes