rainwater harvesting & condensate recovery (chicago 3.1.12)
DESCRIPTION
Rain water harvesting is a water management that protects, restores, and mimics the natural water cycle. Rainwater harvesting and condensate recovery incorporates both the natural environment and engineered systems to provide clean water, conserve ecosystems, and provide a wide variety of benefits for people and wildlife. Additionally, all this can be accomplished at a significantly lower cost than conventional concrete and mortar infrastructure. Join Tom Barrett as he explains how the use of locally produced water helps develop a “natural approach” to efficient use of water and relieves stormwater management issues.TRANSCRIPT
Rain Water Harvesting & Condensate RecoveryNew Tools for
Sustainable Site
Development
by
Tom Barrett
Green Water Infrastructure
C o p y r i g h t © 2 0 1 0 b y To m B a r r e t t
Chicago
Green • Water • Infrastructure
Green • Water • Infrastructure
Green • Water • Infrastructure
Green • Water • Infrastructure
Green • Water • Infrastructure
Untapped Reservoir
Untapped Reservoir
Untapped Reservoir
Untapped Reservoir
Untapped Reservoir
How Much Rain Falls in Chicago?
January - 1.86"February - 1.58"March - 2.59"April - 3.28"May - 3.75"June- 4.08"July - 3.39"August - 3.38"September - 2.91" October - 2.65"November - 2.09"December - 1.88"Total 33.44"
Image of Rain Falling
Graph of Chicago Rain Fall
Thirty Year Average Monthly Rain Fall
Chicago(1971 - 2000)
0.00
0.50
1.00
1.50
2.00
2.50
3.00
3.50
4.00
4.50
5.00
January February March April May June July August September October November December
Month
Inch
es
How Much Water Falls in Chicago?
January - 2,727 gallonsFebruary - 2,540March - 4,130April - 5,735May - 5,268June- 5,657July - 5,470August - 7,200September - 5,096 October - 4,223November - 4,691December - 3,787Total 56,525
Image of Rain Falling
2,500 sq. ft. Roof
How Much Water Falls in Chicago?
January - 11,880 gallonsFebruary - 11,065March - 17,990April - 24,982May - 22,945June - 24,642July - 23,828August - 31,363September - 22,199 October - 18,397November - 20,434December - 16,496Total 246,221
Image of Rain Falling
¼ Acre Residential Property
How Much Water Falls in Chicago?
January - 142,560 gallonsFebruary - 132,784March - 215,876April - 299,783May - 275,344June - 295,710July - 285,934August - 376,358September - 266,383 October - 220,764November - 245,203December - 197,954Total 2,954,654
Image of Rain Falling
3 Acre Commercial Property
How Much Water Falls in Chicago?
January - 475,195 gallonsFebruary - 442,610March - 719,581April - 999,267May - 917,805June - 985,690July - 953,105August - 1,254,515September - 887,936 October - 735,873November - 817,335December - 659,842Total 9,848,756
City Block (660’ x 660’ – 10 acres)
How Much Water is in Rain Event?¼” Rain ½” Rain 1” Rain
2,500 ft. sq. Roof
390 gallons 779 gallons 1,558 gallons
¼ Acre Residential Property
1,697 3,994 67,789
3 Acre Commercial Property
20,366 40,731 135,770
Chicago City Block
67,885 135,770 271,540
What can we do with this water?
• Flush Toilets• Wash Vehicles• Clean Sidewalks• Laundry• Water the
Landscape
How Much Do We Use?
DailyMonthly AnnuallyToilet - 19 gallons 570 6,840Bathing - 15 450 5,400Laundry - 8 240 2,880Kitchen - 7 210 2,520Housekeeping - 1 30 360 Total 50 1,500 18,000
The average household uses between 50 and 100 gallons of water per person per day.
How Much Water Does a Landscape Need in Chicago?
January - 0.00"February - 0.00"March - 0.68"April - 2.01"May - 3.95"June- 5.89"July - 6.99"August - 6.07"September - 3.87" October - 2.08"November - 0.63"December - 0.00"Total 32.17"
Graph of Chicago Evapotranspiration
Evapotranspiration(Chicago)
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0
1
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4
5
6
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8
Month
inch
es
Evaportation
Graph of Chicago Rain Fall & Evapotranspiration
Precipatation(Chicago)
0.0
1.0
2.0
3.0
4.0
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6.0
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inch
es
Rain Fall
Graph of Chicago Rain Fall & Evapotranspiration
ET vs. Precipatation(Chicgo)
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-4
-2
0
2
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8
Month
inch
es Rain Fall
Evaportation
Difference
What is the Problem?
ET Rain DifferenceJanuary - 0.00" 1.75" 1.75" February - 0.00" 1.63" 1.63" March - 0.68" 2.65" 1.97" April - 2.01" 3.68" 1.67" May - 3.95" 3.38" -0.57" June- 5.89" 3.63" -2.26"July - 6.99" 3.51" -3.48"August - 6.07" 4.62" -1.45"September - 3.87" 3.27" -0.60"October - 2.08" 2.71" 0.63"November - 0.63" 3.01" 2.38"December - 0.00" 2.43" 2.43"Total 32.17“ 36.27" 4.10"
Landscape Ecology
Size the landscape to the 80% of the average rain water production.
– Roof Runoff
– Hardscape Runoff
Balancing rain water to landscape creates a functional landscape that utilizes the site’s water production.
Stormwater Mitigation
Stormwater Mitigation
Stormwater Mitigation
Stormwater Mitigation
Stormwater Mitigation
Stormwater Mitigation
– Collection runoff near the source
– Slow it down
– Soak it in
– Filter it
– Apply it to the landscape
– Create habitats
Peak Flow(1 Acre Site)
Grass Field Roof
1 Year Storm 1.4 cfs 4.3 cfs
2 Year Storm 2.1 cfs 5.4 cfs
10 Year Storm 4.3 cfs 8.0 cfs25 Year Storm 5.7 cfs 9.5 cfs
100 Year Storm 8.0 cfs 12.0 cfs
cfs – cubic feet per second
Peak Flow(1 Acre Site)
Grass Field Roof
1 Year Storm 10.5 gps 32.2 gps
2 Year Storm 15.7 gps 40.4 gps
10 Year Storm 32.2 gps 59.8 gps25 Year Storm 42.6 gps 71.1 gps
100 Year Storm 59.8 gps 89.8 gps
gps – gallons per second
Peak Flow(1 Acre Site)
Grass Field Roof
1 Year Storm 630 gpm 1,932 gpm
2 Year Storm 942 gpm 2,424 gpm
10 Year Storm 1,932 gpm 3,588 gpm25 Year Storm 2,556 gpm 4,266 gpm
100 Year Storm 3,588 gpm 5,388 gpm
gpm – gallons per minute
Peak Flow(2,500 sq. ft. Roof)
Grass Field Roof
1 Year Storm 0.08 cfs 0.25 cfs
2 Year Storm 0.12 cfs 0.31 cfs
10 Year Storm 0.25 cfs 0.46 cfs25 Year Storm 0.33 cfs 0.55 cfs
100 Year Storm 0.46 cfs 0.69 cfs
cfs – cubic feet per second
Peak Flow(2,500 sq. ft. Roof)
Grass Field Roof
1 Year Storm 0.60 gps 1.85 gps
2 Year Storm 0.90 gps 2.32 gps
10 Year Storm 1.85 gps 3.43 gps25 Year Storm 2.44 gps 4.08 gps
100 Year Storm 3.43 gps 5.15 gps
gps – gallons per second
Peak Flow(2,500 ft. sq. Roof)
Grass Field Roof
1 Year Storm 36 gpm 111 gpm
2 Year Storm 54 gpm 139 gpm
10 Year Storm 111 gpm 206 gpm25 Year Storm 147 gpm 245 gpm
100 Year Storm 206 gpm 309 gpm
gpm – gallons per minute
Stormwater Effects of Urbanization
Change in Peak Runoff FlowBefore and after Development
0%
50%
100%
150%
200%
250%
1 Year Storm 2 Year Storm 10 YearStorm
25 YearStorm
100 YearStorm
Rain Barrels
Video Jug
How to Build a Rainwater Collection System Video
www.Videojub.com
Collection and Dispersal
Collection Systems
– Rain Barrels
– Downspout Collection
– Cisterns
Dispersal Systems
– Rain Gardens
– Bioswales
– Irrigation
Rain Barrels
Rain Barrels
• Collect a small amount of water– 50 to 300 gallons
• Can be unattractive
• The water must be used
Downspout Collectors
Downspout Collectors
Captures 90% of the rainwater
Cisterns
Above Ground
Cisterns
Below Ground
Video
Installing a 30,000 gallon Cistern In Four Minutes
Putting It Together
Control Systems
Sensors plus Logic Circuits
Cistern Sensors
• High Water – Disperse the water– Alarm
• Irrigation Water– Reserve for landscape
• Household Water– Minimum if household water use
• Low Water l– Pump protection
Irrigation System
• Soil moisture
Drip Irrigation Systems
90% Efficiency Rating
Expanding Stormwater Detention Systems into Stormwater
RetentionSmall increase in size creates a large increase in volume.
Small increase in cost delivers a large volume of water.
Mitigates the ¼” to ½” rainfall events.
Condensation
Condensation
Condensation
Untapped Reservoir
Untapped Reservoir
HVAC Condensation
• ½ gallon per hour per ton of air conditioning.
• 1,000 ton air conditioner produces 8 gallons of water per minute.
• Condensation production occurs when the landscape needs the water.
HVAC Condensation
• ½ gallon per hour per ton of air conditioning.
• One ton of air conditioning for every 700 sq. ft. of floor space.
• One ton of air conditioning for every 5,600 cu. ft. of building volume.
Residential Condensation
• 8 to 15 gallons of water per day.
• 60 to 100 gallons per week.
• 250 to 450 gallons per month.
Commercial Condensation
• 15 gallons of water per minute.
• 360 gallons of water per day.
• 2,520 gallons of water per week.
• 10,000 gallons of water a month.
Green • Water • Infrastructure
Green • Water • Infrastructure
Green • Water • Infrastructure
Green • Water • Infrastructure
Green • Water • Infrastructure
Untapped Reservoir
Untapped Reservoir
Untapped Reservoir
Untapped Reservoir
Untapped Reservoir
Questions?
• Green Water Infrastructure• Strategic Planning
• Marketing• Coaching• Training
Tom BarrettGreen Water Infrastructure, Inc.P.O. Box 124Westfield, Indiana 46074(317) 674-3494