Rainwater Catchment Travis County By: Laura Hurd December 1, 2009.
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Transcript of Rainwater Catchment Travis County By: Laura Hurd December 1, 2009.
![Page 1: Rainwater Catchment Travis County By: Laura Hurd December 1, 2009.](https://reader037.fdocuments.us/reader037/viewer/2022103005/56649e0c5503460f94af436c/html5/thumbnails/1.jpg)
Rainwater CatchmentTravis County
By: Laura HurdDecember 1, 2009
![Page 2: Rainwater Catchment Travis County By: Laura Hurd December 1, 2009.](https://reader037.fdocuments.us/reader037/viewer/2022103005/56649e0c5503460f94af436c/html5/thumbnails/2.jpg)
Overview
unpredictable nature of Central Texas weather
rain catchment devices
land use in Travis County codes and map
average annual precipitation
2000 Census data
water use per person
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Drought
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Rain Catchment Devices
http://renewableenergycreations.com/Products.html
http://saveearth-savehumanity.blogspot.com/2009/03/water-table-level-in-chennai-raised-by.html
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Land Use CodeValue
Definition
100 Single Family - one dwelling in a single building on one lot. May be attached to another unit, as long as there are separate parcels. Includes manufactured, non-mobile homes.
113 Mobile Homes - one or many dwellings in single buildings, designed to be mobile.
150 Duplexes - two dwellings within a single building and on one lot, other than a mobile home.
160 Large-lot Single Family - one dwelling in one buidling on a parcel 10 acres or greater, usually used as a farm, that can possibly be redeveloped for another use
210 Three/Fourplex - Three or four dwellings within individual buildings on one lot.
220 Apartment/Condo - more than 5 dwellings within individual buildings on one lot.
230 Group Quarters - one dwelling containing non-family occupants on one lot and providing. Occupants share services.
240 Retirement Housing - one dwelling containing non-family occupants on one lot and providing services to retirees (ftp://ftp.ci.austin.tx.us/GIS-Data/Regional/landuse/landuse_2003.htm#what)
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Land Use Map
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Land Use Code Raster
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Residential Land Use Raster Calculation
•All residential areas are in grey
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Average Annual Precipitation (inches/year)
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Average Annual Precipitation for Residential Areas
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2000 Census # of people per square mile
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Number of people per cell
cell
people
cell
ftft
ft
mi
mile
people #1000*1000*
27878400
1*
#2
2
2
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Raster Calculation: Volume (ft^3) of water per year per person
€
inches
year*
1 ft
12in.*
1000 ft *1000 ft
cell* .5
# people
cell
⎡ ⎣ ⎢
⎤ ⎦ ⎥
=ft 3
yr − person
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Water Usage• On average100 gallons of water is used per day
per person (Nalco Handbook) which is about 5,000 cubic feet of water per person per year
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Conclusion
•red cells are residential areas with < 5000 cubic feet/year-person of rainwater volume•These red blocks are areas where rainwater catchment is not worth pursuing for all water needs.•Red areas consist primarily of high density housing areas (e.g. dorms, apartments)
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Questions?