Rainwater Harvesting - CoCoRaHS
Transcript of Rainwater Harvesting - CoCoRaHS
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Rainwater Harvesting
Billy Kniffen
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The ability to effectively manage our water resources
is essential for personal and global
sustainability.
3 Photo: NASA
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World Population The water present on the planet millions of years ago
is the same water present today.
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1750 1800 1850 1900 1950 2000 2050
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World Population since 1750
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Population over Human History
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If all the world's water were fit into a gallon jug, the fresh water available for us to use would equal only about one tablespoon. http://www.lenntech.com/water-trivia-facts
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Estimated World Water Use
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Freshwater Demand Trends
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“We never know the worth of water, till the well is dry.” Thomas Fuller, Gnomologia
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1/1/79 1/1/87 1/1/95 1/1/03
Chan
ge in
wat
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vel s
ince
Janu
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1, 1
979
(ft)
Measurement date
Norfolk City
Louisa County
Chesapeake City
Suffolk City (data starts 1980)
Changes in groundwater levels at monitoring wells at four sites in Virginia. These well all show declining water levels. Data are courtesy of the USGS and available through (http://www.epa.gov/WaterSense/pubs/supply.htm).
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“Water is the oil of the 21st century.”
Andrew Liveris, chief executive, Dow, August 2008.
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All Rainfall Is Valuable
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• Two methods to sustain water supply: – Increase Supply – Reduce Demand
Water is life
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• Increased Demand for a Decreasing Supply • Escalating Environmental and Economic Costs • Health Concerns • Drought - Flooding • Providing Water to Areas Without Water • Reducing Storm Water Runoff and Pollution
• Rainwater’s Purity • Right Thing to Do
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Rising Rainwater Interest
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Passive vs.Complex /Active Rainwater Harvesting
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How to Collect Rainwater
P .6 gallons per square foot roof per 1” rainfall P 2,000 sq. foot roof X 1" rain = 1,200 gal. water P 1,200 gal. X 20" rainfall per year= 24,000 gal/yr
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• Footprint of the building
Supply
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My Home and Barn 5000 sq. foot of roof
5000 x .6 gallons/foot = 3,000 gallons of water per 1” rain
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First flush and wet system Volume per first flush 30 gallons total
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Rain Barn and Greenhouse 2500 Square Foot Roof
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Rain barn – 16,500 gallons storage inside and 9,000 gallons out back. Total 25,500 gallons
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2” ball valve on each tank and faucet. All tanks tied together with 1 ½” pvc. One feeder line to pump room. Tanks setting on river gravel .Mainline below ground .
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Overflow from tank-to tank 4” pvc
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Pump room 4’x8’ by 8’high Pipes coming out of pump room One line potable one not potable (for outside drip irrigation)
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1 horse pump and 40 gallon pressure tank
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3 filters – 80 micron, 20 micron and 5 micron charcoal filter
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Ultraviolet light Disinfection system
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Water Usage – Inside The Home
• 19 gallons per person inside the home • 2 people – 38 gallons per day • 1,140 gallons per month • 38 x 365 days = 13,870 • 13,870 / 3,000 = 4.62” per year
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Landscaping for Rainwater Capture
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Water Usage – Outside The Home
• September – 82 gallons per day • Use for May – September (5 months) • 82 x 30 x 5 = 12,300 gallons • 12,300 + 13,870 = 26,170 • 26,170 / 3,000 = 8.72 inches per year • Drought of Record – 1951 = 7.64”
1953 = 9.22” Nov. 2010 – Nov. 2011 – 5.5”
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Menard, TX Margie Russell Memorial Garden
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Rain Garden Bringing Water in off Street
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• Low impact development (LID) is increasingly being adopted as an alternative to traditional water management systems.
• LID includes practices such as bioretention, green roofs, rainwater harvesting, and permeable pavements.
Low Impact Development (LID)
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Pre Development
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Post Development
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Urban Water Budget – Pavement and Rooftop Scenario
ROOFTOP RUNOFF!!
GROUNDWATER??
EVAPORATED WATER
INFILTRATION??
SURFACE RUNOFF!!
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Urban Water Budget – Rainwater Harvesting Scenario
ROOFTOP RUNOFF!!
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We are entering into a new era of water management.
Consider this:
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Current Water Supply Paradigm
Municipal Potable Supply Line represents an unlimited supply of Potable water for all end uses.
Building/Site
all end uses treated equally
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New Water Supply Paradigm.
• Non-Potable (Rainwater) Supply line for non-potable uses, represents a finite amount.
Municipal Potable supply line for specific uses
Building/Site Requiring Water
Supply
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Three approaches to rainwater/stormwater management
Cistern managed for water supply
Cistern managed for stormwater control
AND
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Cistern managed for BOTH water supply and managed for stormwater control or fire
protection
For Supply or Fire Protection
For Stormwater Or Supply
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Definitions Rainwater Harvesting
Rainwater harvesting is the accumulating and storing, of rainwater collected from the roofs of houses, tents, local institutions and other above ground impervious surfaces. It may be used for potable and non-potable in-home use, livestock, irrigation, wildlife, firefighting or to refill aquifers in a process called groundwater recharge. Water runoff from the ground, roads, parking lots impervious areas is called Stormwater harvesting.
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Residential Wastewater Graywater or Greywater or Gray Water is untreated household wastewater that has not come into contact with toilet waste meat preparation sinks including water from:
– Showers – Bathtubs – Hand washing lavatories – Sinks (not used for disposal of hazardous or toxic materials) – Sinks (not used for food preparation or disposal) – Clothes-washing machines (excludes diapers and other
human excreta)
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Reused, Recycled or Reclaimed Water
Reused, recycled or reclaimed water is water that is used more than one time before it passes back into the natural water cycle. Thus, water recycling is the reuse of treated wastewater for beneficial purposes such as agricultural and landscape irrigation, industrial processes, toilet flushing, or replenishing a groundwater basin (referred to as groundwater recharge).
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Rainwater is not:
óRecycled water. óReclaimed water. óReused water.
Rainwater is: óPrimary source water. óWater that has never been used.
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Annual Rainfall – Denver 15.8” Annual Rainfall
January - 0.5 July – 2.2 February - 0.5 August – 1.8 March – 1.3 September - 1.1 April - 1.9 October – 1.0 May – 2.3 November – 1.0 June – 1.6 December – 0.6
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Annual Rainfall – Atlanta, GA 50.2” Annual Rainfall
January – 5.0 July – 5.1 February – 4.7 August – 3.7 March – 5.4 September - 4.1 April – 3.6 October – 3.1 May – 4.0 November – 4.1 June – 3.6 December – 3.8
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Annual Rainfall – Los Angeles 13.2” Annual Rainfall
January – 3.0 February – 3.1 March – 2.4 April – 0.6 May – 0.2 June – 0.1
July – 0.0 August – 0.1 September – 0.3 October – 0.4 November – 1.1 December – 1.8
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• Rainfall Amount • Size of Roof • Use and/or Need • Rain intensity • Rain Frequency (or length between rains) • Storage Size • Is there a back-up supply
Calculate Supply and Demand
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Water Total Average Collection Gallons/ft2 Efficiency Rainfall End of Demand Demand rainfall surface size coefficient factor collected month storage
JAN 28,000 28,000 2.12 15,000 0.62 0.9 17,744 9,744 FEB 28,000 28,000 2.6 15,000 0.62 0.9 21,762 3,506 MAR 28,000 28,000 3.18 15,000 0.62 0.9 26,617 2,123 APR 28,000 28,000 3.38 15,000 0.62 0.9 28,291 2,414 MAY 28,000 28,000 5.34 15,000 0.62 0.9 44,696 19,109 JUN 28,000 28,000 3.7 15,000 0.62 0.9 30,969 22,078 JUL 28,000 28,000 2.48 15,000 0.62 0.9 20,758 14,836 AUG 28,000 28,000 2.13 15,000 0.62 0.9 17,828 4,664 SEP 28,000 28,000 3.18 15,000 0.62 0.9 26,617 3,281 OCT 28,000 28,000 4.55 15,000 0.62 0.9 38,084 13,364 NOV 28,000 28,000 2.59 15,000 0.62 0.9 21,678 7,043 DEC 28,000 28,000 2.71 15,000 0.62 0.9 22,683 1,725
TWDB Calculator
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Texas AgriLife Extension Service Rainwater Harvesting Calculator To use the calculator fill in all highlighted input values.
Input Values
Catchment area (ft2): 150
Collection efficiency (%): 95
Initial tank volume (gal): 0
Tank size (gal): 300
Plant water use coeff: 1
Irrigated area (ft2): 100
Monthly indoor demand (gal): 0
Avg. monthly rainfall (in) Avg. PET (in) AC Condensate (gal)
January: 3 1.79 0
February: 3.1 2.12 0
March: 2.4 3.3 0
April: 0.6 4.49 0
May: 0.2 4.73 0
June: 0.1 5.03 0
July: 0 5.4 0
August: 0.1 5.38 0
September: 0.3 3.94 0
October: 0.4 3.4 0
November: 1.1 2.42 0
December: 1.8 2.22 0
Total: 13.1 44.22 0
Yearly Percent Average Rainfall (%)
Year 1: 100%
Year 2: 100%
Year 3: 100%
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Tank Volume and Supplemental Water Needs for 3 years
Tank VolumeSupplemental Water
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• El Paso – 2.0 inches per hour – 0.021 gallons per square foot per minute
• Tucson – 3.0”/hr – 0.031 g/sq’/min
• San Antonio – 4.4”/hr – 0.036 g/sq’/min
Rain Intensity
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City Inches/Hour GPM/Square Foot
Daytona Beach 4.0 0.042
Palm Beach 5.0 0.052
El Paso 2.0 0.021
Houston 4.6 0.048
Banger, Maine 2.2 0.023
San Diego 1.5 0.016
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Rain Intensity - Denver
• 2.2” per hour • 0.023 Gallons per minute per square foot
• 1000 sq’ x 0.023 = 23 gallons/minute
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Sizing Gutters
1/16” slope/ft. and 2” per hour 3 gutter – 680 sq’ 4” gutter – 720 sq’ 5” gutter – 1,250 sq’ (For each downspout)
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Vertical Piping/Downspouts
• 3” – 67 gpm 3220 sq’ roof • 4” – 144 gpm 6,920 sq’ roof
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From Rain Barrels
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Rain Saucers
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First - Roof
80
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Gutters and Downspouts
nj.com
rutlandguttersupply.com
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Debris Filtering and Removal • Preventing debris from
going into a tank is cheaper and easier than removing it from the tank
• Prune Trees
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Down Spout Filters
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86
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Graf Quattro Twist Downspout Filter and Diverter
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3P Technik VF1 Volume Filter
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El Paso’s Kay Bailey Hutchinson Desalinization Facility
And TECH2O Educational Center
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How Many Drops Are There in 1 Gallon of
Water?
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How Many Drops Are There in 1 Gallon of
Water?
90,400 Drops
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How Many Seconds are in 1 Day?
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How Many Seconds are in 1 Day?
86,400
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Dry Line to 15,000 Gallon Tank, Denton, TX
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RWH Tank Options
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• 620 gallon slim line tank • First Flush • Dry Conveyance • Installed November
2009 in Pacific Grove
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Cisterns Come in many sizes and types of material
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4 Million-Gallon, modular, NSF Annex G-certified potable tank
Fiber Technology Corporation
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USA: A Range of Climates
Source: backyardgardener.com
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USA: Varying Temperatures
ASHRAE Minimum Building Insulation Recommendations (per Standard 189): Zone 1: R-20 Zone 2 – 5: R-25 Zone 6: R-30 Zone 7 – 8: R-35 Source: ASHRAE.ORG
The house insulation r value of insulating boards are: Expanded polystyrene 4/inch Extruded polystyrene 5/inch Polyisocyanurate & Polyurethane 6-7/inch
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USA: Varying Snowfall
Source: mscd.edu
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USA: Varying Frost Lines
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Protection From Freezing •Tank Options:
•Locate Indoors •Bury below frost line •Insulate •Circulate/Aerate •Winterize •Heat with elements or resistant wire
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http://www.uaf.edu/files/ces/publications-db/catalog/eeh/HCM-01557.pdf
The next series of slides come from this document. I have not asked for permission to publish or re-use.
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Using Rainwater
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Drip Irrigation
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Green Houses Water Features
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Wildlife
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Livestock Water
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Types of Drip Irrigation
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By-product
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McDonald Observatory - For Fire Protection
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In-home Use
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Mosquitoes & Midges
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The Bugs
Parasites
Getting Rid of:
Bacteria
Virus
Protozoa
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Filtration
• Coarse solids – Screen – Disk
• Sediment filter – 1, 3- to 5- micron – Bag filter – Cartridge filter
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Disinfection, not Sterilization The goal of disinfection is to rid the water stream of those organisms capable of causing infection. Sterilization is freeing the water stream of ALL LIFE. Possible options for disinfecting rainwater delivered by system Distillation Reverse Osmosis Chlorination Ultraviolet light – UV Ozone
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4.5 to 6.3 Acidic Affects Copper Raise with - Baking Soda
pH Rainwater naturally Acidic
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Individual RAIN BARRELS for collection of Rainwater
General Treatment Goals 1. Nothing grows within:
Mosquitoes, Algae 2. No Debris that will promote
odor 3. No Animal matter present 4. Label Non Potable Water
Sources as below :
Untreated Rainwater Do Not Drink
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“The nation behaves well if it treats the natural resources as assets which it must turn over to the next generation increased and not impaired in value.” Teddy Roosevelt
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Resources • ARCSA website www.arcsa.org - FREE public domain
rainwater harvesting manuals: TX, VA, GA, FL, HI, Ontario. “Resources & Documents” many free publications and hyperlinks to rainwater information around the world
• Texas A&M University http://rainwaterharvesting.tamu.edu
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Thank You - Billy Kniffen