`COVID- 19 Resources
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`Rainwater Harvesting
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`Menu
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`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
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`
`
`Roof Foo rint
`tP \
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`Roof Foot rint
`P \
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`Roof Foot rint
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`P R
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`oof Footprint
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`Roof Footprint
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`Roof Footprint
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`
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`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
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`0.623
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`water (gal)
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`area (ftz)
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`depth
`(in.)
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`conversion
`factor
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`12 Responses to Catchment Area
`
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`Publications
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`Pingback: Five Steps of Rainwater Harvesting — Mark Peterson
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`Petitioner Walmart Inc.
`
`Exhibit 1031 - Page 2 of 5
`
`Petitioner Walmart Inc.
`Exhibit 1031 - Page 2 of 5
`
`
`
`
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`USES OF RAINWATER
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`SYSTEM COMPONENTS
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`Catchment Area
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`Conveyance
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`Storage
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`Treatment
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`Distribution
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`VIDEO AND PICTURE GALLERY
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`ADDITIONAL INFORMATION
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`
`
`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
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` I'IE 3: «a .«LELLN-t
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`GRILIFE
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`County Extension Offices
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`Petitioner Walmart Inc.
`
`Exhibit 1031 - Page 3 of 5
`
`Petitioner Walmart Inc.
`Exhibit 1031 - Page 3 of 5
`
`
`
`Research and Extension Centers
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`Contact Directory
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`Media Contacts
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`Strategic Plan and Impacts
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`Employment Opportunities
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`Reluired Links
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`.x-1L-‘Mnut0r 'I'Eu:
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`AgriLife Bookstore
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`
`
`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
`
`
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