`COVID- 19 Resources
`
`Rainwater Harvesting
`
`Menu
`
`Catchment Area
`
`The catchment area is the first point of contact for rainfall. For the vast majority of tank-based
`rainwater harvesting systems, the catchment area is the roof surface. There are some important
`factors about the roof to consider when planning for a RWH system:
`
`metal flashing that contains lead.
`
`Roof Material — The material of the roof is not as important as
`contaminants that may be on the roof. For landscape purposes, the
`common asphalt shingle will work fine. If you are starting from
`scratch, we recommend a metal roof because they easily shed
`contaminants. In all cases, it’s important to avoid wood shingles or
`
`Slope — The slope of the roof affects how quickly
`water will runoff during a rain event. A steep roof will shed runoff quickly and
`more easily clean the roof of contamination. A less-steep, flatter roof will cause
`the water to move more slowly, raising the potential for contamination to remain
`on the catchment surface. The roof on the right has a steep slope followed by a
`more gradual slope.
`
`
`
`Sizing a Catchment Area — The size of the catchment area or roof will determine
`how much rainwater 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 adding the area of the roof’3 overhang.
`The image below shows how differences in roof slope do not change this building’s catchment
`area.
`
`Petitioner Walmart Inc.
`
`Exhibit 1031 - Page 1 of 5
`
`Petitioner Walmart Inc.
`Exhibit 1031 - Page 1 of 5
`
`
`
`Roof Foo rint
`tP \
`
`Roof Foot rint
`P \
`
`Roof Foot rint
`
`P R
`
`oof Footprint
`
`Roof Footprint
`
`Roof Footprint
`
`
`
`To calculate how much rainwater that you can harvesting, use the equation below. A more detailed
`computer calculator can be found at the Calculators page.
`
`Harvested = catchment x rainfall x
`
`0.623
`
`water (gal)
`
`area (ftz)
`
`depth
`(in.)
`
`conversion
`factor
`
`12 Responses to Catchment Area
`
`Pingback: Gutters: Why They are So Important for Your Home - Plant Nativ
`
`Pingback: Rainwater Storage_| reclaimedlivingfltg
`
`Publications
`
`Pingback: Five Steps of Rainwater Harvesting — Mark Peterson
`
`Pingback: my House Offers 17 Liveahilty Checklist |Myhouseonwheelsforsalearizona
`
`Pingback: The Essential Farm Shed for Your Sustainable Farm — Interior DesignI Design News and Architecture Trends
`
`Pingback: Rainwater Calculator — Efficiency is Innovation
`
`Petitioner Walmart Inc.
`
`Exhibit 1031 - Page 2 of 5
`
`Petitioner Walmart Inc.
`Exhibit 1031 - Page 2 of 5
`
`
`
`
`Pingback: Rain Rain Go Away — Livin’ 00" Grid
`
`Pingback: A roof_qfipossibilities — Cottage Street Gardens
`
`Pingback: Catching Rain — DIYyards
`
`Pingback: Mini Cordwood House Plans: Energy Efficiency — Homestead Houliga_n
`
`Pingback: Four Ways to Grow More with Less Water — Momma Lori's 2 Cents
`
`USES OF RAINWATER
`
`SYSTEM COMPONENTS
`
`Catchment Area
`
`Conveyance
`
`Storage
`
`Treatment
`
`Distribution
`
`VIDEO AND PICTURE GALLERY
`
`ADDITIONAL INFORMATION
`
`
`
`A unique education agency, the Texas A&M AgriLife Extension Service teaches Texans wherever they live, extending research—
`based knowledge to benefit their families and communities.
`
`Po - ular Links
`
` I'IE 3: «a .«LELLN-t
`
`GRILIFE
`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
`
`Media Contacts
`
`Texas 4—H and Youth Dev.
`
`Strategic Plan and Impacts
`
`Employment Opportunities
`
`Reluired Links
`
`.x-1L-‘Mnut0r 'I'Eu:
`
`TE KAS MSW: L] N [VERS ITY
`
`SYSTEM
`
`Compact with Texans
`
`Privacy and Security
`
`Accessibility Policy
`
`State Link Policy
`
`Statewide Search
`
`Equal Opportunity
`
`Veterans Benefits
`
`Military Families
`
`Risk, Fraud 8r Misconduct Hotline
`
`Texas Homeland Security
`
`Veteran's Portal
`
`Financial Disclosures
`
`Open Records/Public Information
`
`Contact
`
`QKJE
`
`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 resources related 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
`
`