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# Rainwater Collection Systems Presentation

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Basic overview of techniques for harvesting and using rainwater in the landscape.

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### Rainwater Collection Systems Presentation

1. 1. Rainwater Harvesting By: Justin Cupp owner Home Improvement & Maintenance, Inc.
2. 2. Water Conservation • Regional Specific • Drinkable Water is an Issue Everywhere • Dry Toilets (Ewww?) • Turning off the faucet in between uses • Low flow fixtures
3. 3. ‘Water’ The Facts • Water makes up 70% of the human body • The Earth is covered with 70% water • Fresh Water accounts for only 1% of all water found on Earth • Drinking Water is less than 0.1% of 1% of the total water found on Earth • 70% of potable water used goes to the landscape except in Civano
4. 4. Creating a Water Budget • Start by calculating how much water you use in the landscape • Approximately 0.67 gallons of rainwater per square foot, per inch of rain can be captured from a rooftop • On 2000 sq. ft., 1340 gallons of rain is shed on 1” of rain!
5. 5. Factors That Determine Landscape Watering Needs • Determine the type of • Evapotranspiration- the water use plants that are amount of water that is in your landscape evaporated through the – VL- Very low water use hydrologic cycle and how (Cacti, Native Species) much water is lost when – L- Low water use plants a plant transpires or – M- Moderate water use “sweats” through its plants leaves – H- High water use vegetation (grass) • Landscape Area
6. 6. Calculations • Sq. Ft. * rainstorm event * Runoff Coefficient * 7.48gal/cu.ft. = Total catchment in gallons • Et * Plant Factor * Area * 0.623 = Total plant water demand for landscape • [(Et * PD = PWN) * 0.623 = GPS] * LA = LCD
7. 7. Contours of Landscape (cont’d) • The contour and grade of the landscape plays a major role in how the landscape will perform and how water shed erodes the surface on site and downstream • Different techniques have different qualities but when combined create optimal conditions for the landscape and nature
8. 8. The Inconvenience Issue • The C.A.P. program is already showing signs of stress • Water limits have already been unofficially set for areas such as Sahuarita and Green Valley • With the population of people growing by the minute, the current resource supply will not meet the demand. • Most HOA boards & bureaucrats prevent the ability to utilize rainwater collection except for Civano!
9. 9. Now It’s Time to Start Collecting! • Once you have determined the water use for your specific situation it’s time to start exploring your options!
10. 10. Two Primary Strategies • There are two primary ways to harvest rainwater: • Passive Rainwater Harvesting • Active Rainwater Harvesting
11. 11. Passive Rainwater Harvesting • Rainwater Collection is the intentional contouring of landscape to utilize the water shed off of a surface without the use of a containment system
12. 12. Passive Rainwater Harvesting • Berms and Swales • Curb Cuts • Raised Walk Paths • Sunken landscape • Channeling • Gabions • Retention/Detention basins
13. 13. Curb Cuts and Gabions
14. 14. Raised Walk Paths & Sunken Landscape
15. 15. Active Rainwater Harvesting • Active Rainwater Harvesting is the use of containment systems to store rainwater for beneficial use over a period of time.
16. 16. What Type of Containment System? • Above or Below Ground? • Fiberglass • Steel Culvert • Plastic • Masonry • Reinforced Concrete
17. 17. Digging Area, Setting Pipe/Rebar & Pouring the Foundation
18. 18. Set in Place and Stabilize
19. 19. Stabbing the Overflow
20. 20. Put a Lid On It • Covers on storage tanks are necessary to prevent animals and debris from entering and potentially causing clogging the system • Prevents algae growth inside tank • Discourages mosquito harboring & breeding
21. 21. ‘Water’ the benefits? • It’s “free”! • Reducing, Reusing and Recycling! • Plants love rainwater! As a result they grow better, faster and require less watering • Recharge the groundwater supply onsite versus sending it downstream to cause erosion and flood damage • Tax Incentives from the State of Arizona through 2011. 25% or up to \$1000
22. 22. Now It’s Time to Sit Back and Watch as you Collect…
23. 23. Contact Info: Justin Cupp 520.981.4747 rainwatercupp@yahoo.com www.rainwatercupp.com coming soon!