Introduction to Rainwater Harvesting. Department of Biological and Agricultural Engineering Texas A&M University
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1 Introduction to Rainwater Harvesting Department of Biological and Agricultural Engineering Texas A&M University
2 Rainfall in your watershed What is a watershed? An area of land that drains to a common point Quick facts Texas has more than 191,000 miles of rivers Texas has almost 2 million acres of lakes 40% of TX springs are no longer running 30-50% of total water is used for landscape irrigation The state population will nearly double in the next 50 yrs Population growth for Ellis county increased 20% & TX 10% from 2000 to 2005
3
4 Major Aquifers
5 Water Quality Impacted by Natural processes Activities of man
6 Rainfall in your watershed Understanding the Hydrologic Cycle
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8 What is rainwater harvesting? Rainwater harvesting is the capture, diversion, and storage of rainwater for use in landscaping and other purposes.
9 Why harvest rainwater? Rainwater harvesting Saves money Reduces demand on municipal water supply Makes efficient use of a valuable resource Reduces flooding, erosion, and contamination of surface water Decreasing supply of fresh water
10 Why harvest rainwater? Water Awareness & Conservation How much water do I use? Average per person is gallons a day How can I conserve water? Number 1 household water user is commode at 20% Where does my water come from? Well water, Surface lake, Rain How long will I have fresh water?
11 Renewed Interest in Collecting Rainwater PIncreased Demand for a Decreasing Supply PEscalating Environmental and Economic Costs PHealth Concerns PConservation and Drought PProviding Water to Areas Without Water PReducing Storm Water PRainwater's Purity
12 Why harvest rainwater? Rainfall Depth (in.) Volume per 1000 ft 2 of catchment area (gal)
13 Where can rainwater harvesting be used? Rainwater harvesting can be used in small residential landscapes. Attract & provide water for wildlife, birds, and butterflies Add interest, soothing sound, and beauty.
14 Where can rainwater harvesting be used? Rainwater harvesting can be used in small residential landscapes. Supplement landscape water needs Provide water for nurseries & green houses. Flushing toilets, laundry, wash cars. Treated and used for in home use.
15 Rain Gardens
16 Where can rainwater harvesting be used? Rainwater harvesting can be used in largescale landscapes. Parks Schools Commercial Sites Parking Lots Apartment Complexes Residential Homes
17 Rainwater Collection Tanks
18 Rainwater Collection Tanks
19 How Rainwater Harvesting Works A rainwater harvesting system consists of The supply rainwater The demand plant water needs The collection system Simple and complex systems Simple distribute rainwater immediately Complex store some or all of rainwater for later use
20 Supply: Rainfall Supply comes in the form of runoff, rainwater that flows off a surface. If the surface is impermeable, runoff occurs immediately. Pavement Concrete Roofs If the surface is permeable, runoff occurs when the surface is saturated.
21 Demand: Plant Water Requirements The amount of water needed is determined by Type of plants Number of plants Growth stage of plants Size of plants Plants native to the region are the best choices because their water requirements are met by normal rainfall amounts.
22 Simple Rainwater Harvesting Systems A simple water harvesting system consists of a catchment, a distribution system, and a landscape holding area. Catchment Any area from which water can be collected (e.g. roofs, pavement, or soil surface) Hard, smooth surfaces best Amount of water collected depends on size, surface texture, slope, and rainfall received
23 Simple Rainwater Harvesting Systems A simple water harvesting system consists of a catchment, a distribution system, and a landscape holding area. Distribution System Channel water from catchments to landscape holding area Include gutters and downspouts, sloped sidewalks, hillsides, street curb cutouts and channels, and ditches Use gravity, gates, or a small pump to cause flow through the distribution system
24 Simple Rainwater Harvesting Systems A simple water harvesting system consists of a catchment, a distribution system, and a landscape holding area. Landscape Holding Area Concave depression covered by grass or plants Store water for direct landscape use and reduce flooding and erosion May be linked through spillways Create landscape holding areas by digging out a depression and using the resulting soil as a berm around the depression
25 Harvesting Urban Rainwater to Reduce Erosion and Flooding Rain falling on impermeable surfaces runs off immediately, creating flooding and erosion potential. Harvesting urban rainwater can prevent flooding and erosion. Methods to harvest urban rainwater include: Crescent-shaped berms around plants on slopes Gabions (piles of large rocks encased in wire mesh) French drains (holes or trenches filled with gravel) Permeable paving materials, such as gravel, crushed stone, and open or permeable paving blocks, on steep slopes Terrace grading (stair-step-like shelves) of slopes
26 Should I invest in a complex rainwater harvesting system? Complex systems include water storage, cost more to build, and yield greater water savings. Factors to consider in deciding whether or not to invest in a complex system: Availability of other water supplies for irrigation Need for professional assistance in design and construction Cost of storage container, pumps, and maintenance Long investment payback period several years Personal commitment to water conservation ethic
27 Should I invest in a complex rainwater harvesting system? Reduce the cost of a complex system by Building a smaller storage container to harvest less than the total landscape need Limiting landscape area or reducing plant density Replacing high-water-use plants with medium- or low-water-use plants
28 Complex Rainwater Harvesting Systems A complex rainwater harvesting system consists of catchments, a conveyance system, storage, and a distribution system. Catchments The yield that a catchment provides depends on its size and surface texture. Surface textures include: High yield concrete, asphalt, and smooth roofing material Medium yield bare soil; compacted clay best Low yield areas with plants, such as grass or groundcover
29 Roofs and Collection Surfaces
30 Complex Rainwater Harvesting Systems A complex rainwater harvesting system consists of catchments, a conveyance system, storage, and a distribution system. Conveyance Systems Direct water from catchments to storage containers Roof conveyance systems use canals or gutters and downspouts to direct water into storage containers
31 Gutters Convey the water to the tank Roof washers - removes trash, debris & dust
32 Complex Rainwater Harvesting Systems A complex rainwater harvesting system consists of catchments, a conveyance system, storage, and a distribution system. Storage Storage makes rainwater available when needed.
33 Rain Barrels
34 Tanks are available in many sizes and types of material
35 Complex Rainwater Harvesting Systems A complex rainwater harvesting system consists of catchments, a conveyance system, storage, and a distribution system. Distribution System Channels water to plants from storage containers.
36 Distribution Systems Drip irrigation Water garden Wildlife and Livestock water Sprayer tanks Sprinklers, misters & watering with pressure In home potable use
37 Designing and Building a Complex Rainwater Harvesting System Step 1: Site Analysis Step 2: Calculations Calculate Supply Calculate Demand Balance Supply and Demand Step 3: Final Design and Construction Step 4: Field Testing System Maintenance
38 Example 1: Calculating Supply Rainfall Harvesting Supply Worksheet A B C D E F Follow the lettered instructions for each month. Enter the rainfall amount in inches for each month. Multiply A by to convert inches to gallons per square foot. Enter the square footage of the catchment surface. Multiply B by C to yield the gross gallons of rainfall per month. Enter the runoff coefficient for your catchment surface. Multiply D by E to obtain the total monthly yield of harvested water in gallons. January February March April May June July August September October November December Annual ,327 29,995
39 Example 2: Calculating Demand Rainfall Harvesting Demand Worksheet A B C D E F Follow the lettered instructions for each month. Enter the ET amount in inches for each month. Enter the appropriate plant water use coefficient. Multiply A by B to obtain plant water needs in inches. Multiply C by to convert inches to gallons per square foot. Enter the total square footage of landscaping. Multiply E by D to obtain total landscaping water demand in gallons. January February March April May June July August September October November December Annual ,201
40 Examples 1 and 2 Supply/ Demand Balance Worksheet Storage/Supplemental Municipal Use Worksheet Month Yield Demand Cumulative Storage (Yield Demand) Supplemental Use YEAR 1 January 1,512 1, February 1,594 1, March 1,722 2, April 2,369 2, May 4,301 4, June 3,918 4, July 1,850 4, ,613 August 2,342 4, ,160 September 2,733 3, October 3,517 2, November 2,351 1,761 1,332 0 December 1,786 1,206 1,912 0
41 Why harvest rainwater? WHY NOT!!!! Rainwater harvesting Saves money Reduces demand on municipal water supply Makes efficient use of a valuable resource Reduces flooding, erosion, and contamination of surface water
42 Other Resources Russell A. Persyn, Ph.D. Rainwater Harvesting, 2004 (Texas Agricultural Extension). City of Albuquerque, Rainwater Harvesting: Supply from the Sky. Billy Kniffen, Rainwater Harvesting in Menard County (Menard County Extension). Lower Colorado River Authority, Saving from a Rainy Day (Austin, TX). Wendy Todd Price and Gail Vittori, Texas Guide to Rainwater Harvesting, Second Edition (Texas Water Development Board, 1997). Jerry Turrentine, Wildlife Watering Facilities (USDA Natural Resource Conservation Service, 1992). Patricia H. Waterfall, Harvesting Rainwater for Landscape Use (Arizona Department of Water Resources, 1998).
43 Web Sites Rainwaterharvesting.tamu.edu Texaswater.tamu.edu
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