Information about rain barrels, rain gardening, stormwater management, etc ...
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Transcript of Information about rain barrels, rain gardening, stormwater management, etc ...
Information about rain barrels, rain gardening, stormwater management, etc http://www.clemson.edu/public/carolinac
lear/cc_toolbox/tools_pubs.html#pubs_rb
http://www.raincollectionsupplies.com/
http://www.rainbarrelsource.com/http://www.rainharvest.com/shop/def
ault.asp
Free source of water Graywater
Supplement limited ground water Low in minerals
Laundry, dishwashing, hair washing, and car No chlorine
Garden ponds Not regulated by municipal water
restrictions Periods of drought
On average, Americans use 70 gallons per person per day Toilets, showers, clothes washers, sinks,
and other appliances For each person, that’s about 500
square feet of roof + 1000 gallons of storage to meet these needs
Today, 1.1 billion humans lack access to freshwater and 2.6 billion are without adequate sanitation.
By 2025 the developing world's demand for water will have increased by 50 percent
Rodney Glass: “Man historically has treated stormwater and rainwater as a waste product.”
Tucson’s water demand is 147,000 acre feet/year while Tucson receives 185,000 acre feet/year of rainwater. It costs less money to harvest rainwater than to try to get rid of it compared to $300/acre foot to desalinate water. Desalinizing sea water costs upwards of $1,000/acre foot and has to be brought in from the coast.
On October 14, 2008, the Tucson City Council adopted a Commercial Rainwater Harvesting Ordinance which applies to new commercial construction. Facilities subject to the ordinance must meet 50% of their landscape demand using harvested rainwater, prepare a site water harvesting plan and water budget, meter outdoor water use, and use irrigation controls that respond to soil moisture conditions at the site.
Rainwater harvesting systems have 4 major subsystems: Capture, Conveyance, Holding, and Distribution (non-irrigation systems will include Filtration and Purification
Roof of the house Keep debris out of the
water system Screens on gutters or
downspouts
Footprint of the building
Maximum Rainfall RateBased on 100 year data
Charleston, SC4.1” per hour0.043” per square foot
Annual rainfallCharleston, SC 51.4”
about .6 gallons per sq foot for 1” of rain 600 gallons per 1000 sq foot for 1”
rainfall
Rain Chains
Getting the water from the roof to the tank
Landscape piping moves water from the downspouts to the tank. Gravity
https://www.youtube.com/watch?v=ssDIkR6mN-0
https://www.youtube.com/watch?v=NHFXohrysf8
Each turn increases friction and reduces flow
https://www.youtube.com/watch?v=LtWlSVh2vTc
Bird feces, Plant debris, soil, eroded roof materials, and other solids
Debris eater
Wet versus Dry
Dry
Dry lineDrain after rain
Drain For Wet System
Wet lineRetain water in lineRequire clean out
Friction between the water and the pipe impede flow
First flush
First flush diverter
Discards the initial runoff from a roof before it reaches the storage tank
Ball or flapper shuts off the top of the pipe
Additional rainfall flows into tank
Small-diameter outlet slowly releases “first-flush” water to empty for next rain
Roof with minimal pollution Capture 12.5 gallons / 1,000 square of
roofHeavily polluted roof
Capture 50 gallons / 1,000 square feet of roof
POT FILTER captures rainwater from a single downspout
Normally buried and flush with the ground
The gravel strains out coarse debris
Filter mat smaller particles
BASKET FILTER utilizes screen basket
Water flows in through a top port, through the basket, and out bottom port
A second port is provided at the top to allow overflow should the filter basket become full
CASCADE FILTERS do not collect debris, but rather allow it to wash through the filter
Minimize maintenance Lower water recovery
rates Rainwater cascades
over a curved, multi-level screened filter
Filtered water exits through bottom port; debris is washed down the surface of the filter
Graf Quattro Twist Downspout Filter and Diverter
VORTEX FILTERS are similar to cascade filter
Rainwater flows through the top port, spins around the circumference of the filter body, and spills into the top of the filter element.
Capillary effect draws water through the side walls of the filter exits through the upper side port
Debris washes down exits through the lower bottom port
Reduced capture efficiency, typically 85% to 90%
Tanks Storage System
SURFACE STORAGE
Free-standing plastic tanks offer the least expensive means of rainwater
Menard Multi-Purpose Building 30,000 Gallons
Rain barrels
Mosquito screen
Gravity 0.433 psi per foot
Boerne Texas Champion High School gathers over 4.5 million gallons of water from parking lot run-off, roof gutters and air-conditioner condensation. - water is stored in elevated tanks and underground storm drains.
UNDERGROUND STORAGE
Unaffected by freezing weather, and can last indefinitely.
Cool, dark environment less chance for MO activity
3x as expensive as surface storage
Robert Redford BuildingSanta Monica, California
RainCavern An underground
chamber of plastic modules wrapped in a waterproof membrane
Virtually limitless storage in various shapes
Withstands vehicular traffic
Collapsible tank
Pump or gravity fed
FLOATING EXTRACTOR
Cleanest water in the tank is generally a few inches below the surface.
Intake suspended from a float
Rises and falls with the tank water level
Inlet (calming effect)Outlet at bottomOverflow Inspection PortVent
Calming InletScreen basket at inspection portOverflow lower than inlet
Pre-filtered rainwater can be used for landscape irrigation, garden ponds, and most exterior applications.
Toilet flushing and clothes washing, a sediment filter will remove suspended solids which can cause discoloration and odors
For showering, hand washing, or drinking, use a high-intensity ultraviolet sterilizer to kill microorganisms that could cause illness
Connect in series
Isolation valves
Same size as inflowLid
http://www.finewaters.com/Bottled_Water/USA/Oregon_Rain.asp
http://www.natsys-inc.com/