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NC-2009 WEc2:Innovative Wastewater Technologies

Rainwater Harvesting Tank Calculations

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Erin Holdenried
Sustainability Architect
LEEDuser Basic Member
88 thumbs up

Has anyone found a good spreadsheet/website that calculates the approximate size of a rainwater tank needed for a given roof area and water usage? I have made my own but am unsure of how accurate it is. Does anyone know how detailed the supporting documentation needs to be for this credit? I am going on average rainfall per month and 80% efficiency. The project is located in Ireland. Thanks so much.

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Tristan Roberts
Representative
Vermont House of Representatives
LEEDuser Expert
7780 thumbs up

Sun, 11/20/2011 - 03:58

S W, did you ever find any useful resources? Was your documentation approved?

Tue, 04/10/2012 - 13:29

There are some interesting rainwater harvesting simulation graphs available at www.architectscience.com that show the basic relationship between tank size, daily use and the quantity of rainwater harvested over a twenty year period in Washington DC, Philadelphia and New York City. Ideally, rainwater tanks should be sized according to a simulation based on long term historical rainfall data of the project location.

Tue, 04/17/2012 - 19:33

Also available from Virginia Stormwater BMP Clearinghouse is a non-proprietary Excel spreadsheet that uses a 30 year rainfall database to generate tables and graphs indicating the quantity of harvested rainwater (developed by Rainwater Management Solutions). http://vwrrc.vt.edu/SWC/nonproprietarybmps.html
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Andres Schwarz
Principal
NRG-AR / Green Certification Consultants
LEEDuser Premium Member
6 thumbs up

Thu, 05/12/2022 - 19:31

Please be advised that the Virginia Stormwater Excel spreadsheet has been moved to https://swbmp.vwrrc.vt.edu/ and is called VA_RainwaterHarvestingSpreadsheet_12Jun2013_v2.2.xlsx (https://swbmp.vwrrc.vt.edu/wp-content/uploads/2021/05/VA_RainwaterHarvestingSpreadsheet_12Jun2013_v2.2.xlsx) [Last accessed: May 12, 2022]

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