`COVID-19 Resources
`
`Rainwater Harvesting
`
`Menu
`
`Catchment Area
`
`The catchmentareais the first point of contact for rainfall. For the vast majority of tank-based
`rainwater harvesting systems, the catchmentareais the roof surface. There are some important
`factors about the roof to consider when planning for a RWH system:
`
`metalflashing that containslead.
`
`Roof Material — The material of the roof is not as importantas
`contaminants that may be on theroof. For landscape purposes, the
`commonasphalt shingle will workfine. If you are starting from
`scratch, we recommend a metal roof because theyeasily shed
`contaminants.In all cases, it’s important to avoid woodshingles or
`
`Slope - The slope of the roof affects how quickly
`water will runoff during a rain event. A steep roofwill shed runoff quickly and
`moreeasily clean the roof of contamination. A less-steep, flatter roof will cause
`the water to move moreslowly,raising the potential for contamination to remain
`on the catchmentsurface. The roof on the right has a steep slope followed by a
`more gradualslope.
`
`
`
`Sizing a Catchment Area - Thesize of the catchmentarea or roof will determine
`how muchrainwater that you can harvest. The area is based on the “footprint” of the roof, which
`can be calculated by finding the area of the building and addingthe area of the roof’s overhang.
`The image below showshowdifferences in roof slope do not changethis building’s catchment
`area.
`
`Petitioner Walmart Inc.
`Exhibit 1031 - Page 1 of 5
`
`Petitioner Walmart Inc.
`Exhibit 1031 - Page 1 of 5
`
`
`
`Roof Footprint,
`pI %
`
`Roof Footprint
`pi
`
`Roof Footprint
`tp
`
`NN
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`
`
`
`Roof Footprint
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`Roof Footprint
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`Roof Footprint
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`To calculate how much rainwater that you can harvesting, use the equation below. A moredetailed
`computercalculator can be foundat the Calculators page.
`
`Harvested = catchment x rainfall x
`water (gal)
`area (ft?)
`depth
`(in.)
`
`0.623
`conversion
`factor
`
`12 Responses to Catchment Area
`
`
`Pingback: Gutters: Why They are So Important for Your Home- Plant Nativ
`
`Pingback: RainwaterStorage| reclaimedlivingblog
`
`Publications
`
`
`
`
`Pingback:Five Steps of Rainwater Harvesting - Mark Peterson
`
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`Pingback: Tiny House Offers 17 Liveabilty Checklist |tinyhouseonwheelsforsalearizona
`
`Pingback: The Essential Farm Shed for Your Sustainable Farm - Interior Design, Design News and Architecture Trends
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`
`Pingback: Rainwater Calculator - Efficiency is Innovation
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`Petitioner Walmart Inc.
`Exhibit 1031 - Page 2 of 5
`
`Petitioner Walmart Inc.
`Exhibit 1031 - Page 2 of 5
`
`
`
`
`Pingback: Rain, Rain Go Away - Livin' Off Grid
`
`Pingback: A roofofpossibilities - Cottage Street Gardens
`
`
`Pingback: Catching Rain - DIYyards
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`Pingback: Mini Cordwood House Plans: Energy Efficiency - Homestead Houligan
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`Pingback: Four Ways to Grow More with Less Water - MommaLori's 2 Cents
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`USES OF RAINWATER
`
`SYSTEM COMPONENTS
`
`CatchmentArea
`
`Conveyance
`
`Storage
`
`Treatment
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`Distribution
`
`VIDEO AND PICTURE GALLERY
`
`ADDITIONAL INFORMATION
`
`About
`
`A unique education agency, the Texas A&M AgriLife Extension Service teaches Texans whereverthey live, extending research-
`based knowledgeto benefit their families and communities.
`
`Popular Links EXTENSION
`
`County Extension Offices
`
`Petitioner Walmart Inc.
`Exhibit 1031 - Page 3 of 5
`
`Petitioner Walmart Inc.
`Exhibit 1031 - Page 3 of 5
`
`
`
`Research and Extension Centers
`
`Contact Directory
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`Media Contacts
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`Texas 4-H and Youth Dev.
`
`Strategic Plan and Impacts
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`Employment Opportunities
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`Required Links
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`MEMBER OF THE
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`OUD.CNet UNIVERSITY
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`SYSTEM
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`Compact with Texans
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`Privacy and Security
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`Accessibility Policy
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`State Link Policy
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`Statewide Search
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`Equal Opportunity
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`Veterans Benefits
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`Risk, Fraud & Misconduct Hotline
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`Texas Homeland Security
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`Veteran's Portal
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`Financial Disclosures
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`Open Records/Public Information
`
`Contact
`
`oe
`AgriLife Bookstore
`
`Petitioner Walmart Inc.
`Exhibit 1031 - Page 4 of 5
`
`Petitioner Walmart Inc.
`Exhibit 1031 - Page 4 of 5
`
`
`
`AgriLife Extension's online Bookstore offers educational information and resourcesrelated to our many areas of expertise and
`programming;from agriculture, horticulture, and natural resources to nutrition, wellness for families and youth, and much
`more.
`
`Petitioner Walmart Inc.
`Exhibit 1031 - Page 5 of 5
`
`Petitioner Walmart Inc.
`Exhibit 1031 - Page 5 of 5
`
`
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