rainwater harvesting: an overview and implementaion at the local level
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8/9/2019 Rainwater Harvesting: An Overview and Implementaion at the Local Level
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RAINWATER HARVESTING:A FORGOTTEN PRACTICE
Thomas Jefferson Soil & WaterConservation District
434-975-0224
www.tjswcd.org
Ancient, pre-Islamic water-cisterns in Aden
(http://www.aridlands.co.uk/ar-overseas.htm)
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200 cubic feet of water
= 1500 gallons(50 gallons/day for a month)
2 RAIN STORM
30x40 ROOF (1,200 sq. ft.)
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Thomas Jefferson Soil and WaterConservation District
3,200 showers or,
> 1,000 loads of laundry or, > 10,000 commode flushes or, > 250 1-inch waterings of a 1/4 acre lawn or, any combination of the above water uses
Virginias average annual rainfall = 42.70
In one year, 32,000 gallons of rain runs off
a 1,200 sq. ft. roof -->
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8/9/2019 Rainwater Harvesting: An Overview and Implementaion at the Local Level
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Thomas Jefferson Soil and WaterConservation District
RAINWATER SUPPLY WATER USEAGE (2004)
Total Roof Area = 130,000 ft.2
43 rain/yr. = 465,830 ft.3 =3,500,000 gallons/year =
292,000 gallons/month
Total = 1,665,000 gallonsfor year
Range: 75,000 - 226,000
gallons/monthAverage: 138,750gallons/month
MONTICELLO HIGH SCHOOL
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Thomas Jefferson Soil and WaterConservation District
BENEFITS OF USINGROOFTOP RUNOFF COLLECTION
Reduces demandon groundwater or municipalwater supplies Serves as a stormwater managementalternativeby reducing the volume, velocity, and peak flows of
stormwater runoff As stormwater is controlled, floodingandstreambank and channel erosionare reduced Less stormwater runs over hard surfaces,
decreasing the impuritiesin stormwater runoff
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Thomas Jefferson Soil and WaterConservation District
January 3.13February 3.08March 3.86April 3.29May 3.99June 3.69
July 4.31August 4.14September 3.50October 3.36
November 3.21December 3.18
Virginia Long-Term Average Precipitation (1895-1998)
(from University of Virginia Climatology Office)
ANNUAL 42.70
32,000 GALLONSFROM 1200 SQ.FT.
ROOF
AVG. 87 GALLONSPER DAY
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8/9/2019 Rainwater Harvesting: An Overview and Implementaion at the Local Level
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Thomas Jefferson Soil and WaterConservation District
WHERE DO WE BEGIN?
(Photos - courtesy of American Rainwater Catchment
Systems Association)
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Thomas Jefferson Soil and WaterConservation District
START SMALL . . .
. . .
Full after < 1/10of rain on 1,200
sq.ft. roof
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Thomas Jefferson Soil and WaterConservation District
. . . EVOLVE TO SOMETHING BIG
(Photo - courtesy of American Rainwater Catchment Systems Association)
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Thomas Jefferson Soil and WaterConservation District
filling bird baths, fish ponds,childrens pools
watering plants washing cars
Outdoor uses for rain barrel water:
Homemade rain barrels:
simple attractive economical
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Thomas Jefferson Soil and WaterConservation District
11 rain barrelsprovide over 600gallons of water
storage (.8 rain on1,200 sq.ft. roof).
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Thomas Jefferson Soil and WaterConservation District
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Chesapeake BayFoundation OfficeBuilding, Annapolis MD
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Thomas Jefferson Soil and WaterConservation District
Chesapeake Bay
Foundation OfficeBuilding, Annapolis MD
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Thomas Jefferson Soil and WaterConservation District
(Photo - courtesy of American Rainwater Catchment Systems Association)
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Thomas Jefferson Soil and WaterConservation District
WHAT NOW?
1. POLICY
2. EDUCATION
3. COMMUNICATION
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Thomas Jefferson Soil and WaterConservation District
32.1-248.2. Use of rainwater and reuse of gray water.
A. The Department shall develop by January 1, 1999, guidelinesregarding the use ofgray water and rainwater. The guidelines shalldescribe the conditions under which gray water and rainwater mayappropriately be used and for what purposes. The guidelines shallinclude categories of used water, such as types of used household
water and used water from businesses, which are appropriate for reuse.The guidelines shall include a definition of gray water that does notinclude used toilet water.
B. The Department, in conjunction with the Department of EnvironmentalQuality, shall promote the use of rainwater and reuse of gray water as
means to reduce fresh water consumption, ease demands on publictreatment works and water supply systems, and promote conservation.
(1998, c. 155.)
WHAT NOW?
1. POLICY
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Thomas Jefferson Soil and WaterConservation District
Enforce Code of Virginia 32.1-248.2 for development ofguidelines
Provide incentives (tax credits, credits towards stormwater
management requirements )
Develop two levels of technical criteria and sizing standards:
Stormwater Management
Water Conservation
WHAT NOW?1. POLICY (cont):
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Thomas Jefferson Soil and WaterConservation District
WHAT NOW?2. EDUCATION:
3. COMMUNICATION:
Local Level: Health Department & Building Officials
(plumbing permits and water system permits) State Level: DEQ, DCR, VDH
Educate public regarding distinction between use of gray
water and rainwater harvesting Educate public regarding relative raw water quality of roof
runoff vs. reservoir water (runoff from roads, farms, parking
areas, etc.) and degree of treatment needs
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(Photo - courtesy of American Rainwater Catchment Systems Association)
TJSWCD
434-975-0224www.tjswcd.org
IT DOESNT HAVE TO BE
COMPLICATED!
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