Where Arizona water comes from

Water management is the process of getting usable water to the consumers. Arizona happens to have one of the most advanced water systems in the world. Throughout Arizona there is an arrangement of canals, dams, and ponds that move water to its destination. Arizona does not just have one source of water supply, it has three sources. Those sources are broken down into three categories which are ground water, surface water, and reclaimed water.

Ground water comes from natural reservoirs called aquifers. As you can see in the picture above, aquifers are below the earth’s surface. The aquifer is naturally replenished. There is a problem that occurs with using this water, it is called overdraft. Overdraft is when more water is pumped out than it is replenished. About 40% of Arizona’s water comes from groundwater that is in the aquifers. Since Arizona has a growing population, using more groundwater will pose a dilemma for the state. To help combat this problem Arizona implemented the Groundwater Management Code. The three goals of the code are to control severe overdraft, distribute groundwater to meet the needs of the state, and supplement groundwater through water supply development.

 

Surface water comes from lakes, rivers, and streams. As you can see in the state map, there are many surface water sources. Being in a desert climate you also have to realize that there are many dry rivers and streams. What is shown blue on the map does not mean there is water that is presently there. This supply is variable and is reliant on the climate. In order to capitalize on this resource there are storage reservoirs and delivery systems in place. The surface water accounts for about 19% of water supply for the state excluding the Colorado River.

 

Although the Colorado River is a resource from surface water, it is in a separate category. This resource is shared and has a limit on what the state can use. The states that use the river are Arizona, California, Nevada, Utah, Colorado, New Mexico, Wyoming, and the country Mexico. The law that governs the use of the river is known as the, Law of the River. Under this law Arizona can use 2.8 million acre feet per year. The Colorado River accounts for about 39% of water for Arizona.

 

Reclaimed water accounts for 2% of water in Arizona. This source is not for consumption. Reclaimed water comes from treated wastewater. This source of water is commonly used for industrial purposes, landscaping, agriculture, and wildlife areas. Reclaimed water is also known as effluent water.

 

Here is a link to ABCs of Water which contains information on where Arizona water comes from.

http://www.azwater.gov/AzDWR/PublicInformationOfficer/ABCofWater.htm

 

Published by: Paul Reyes

Where the water is going

The majority of the water Arizona uses goes to agriculture which is about 70%. Municipal water use comes in as the second largest which is 22%. Industrial use is the least which is about 8%. The data is according to the information from Arizona Department of Water Resources.

ADWR
Percentage of water used by each major category
supplydemand.pdf
Adobe Acrobat Document 49.1 KB

There is waste within the agricultural use of water and there are a number of best practices in place to limit the loss of water. These practices will help alleviate the problem of wasting water.

Best Practices for Agriculture according to ADWR

  • Concrete-lined ditches
  • Grade land by use of laser
  • Level basin irrigation
  • Sprinkler irrigation
  • Tailwater water re-use system
  • Crop rotation
  • Flow rate measurments
  • Bed and furrow shaping
  • Irrigation scheduling
  • Drip or trickle irrigation
  • Soil and water analysis 

Industry users must also comply with regulation to limit the loss of water. They must make efforts to recycle water. Another requirement is low flow plumbing. The landscaping must also be drought tolerant or have plants that use little water. After the year 2002, ground water cannot be used to water landscaping or be used to maintain artificial water structures like a pond or a fountain.

 

Municipal users use about 25% of the water available. As residents there are many ways that we can save water. We often get into habits that are hard to change but with effort on our part we can help reduce water waste. It is necessary for every user to make an effort because water is scarce in the desert climate of Arizona and it is a limited resource across the globe. There are a number of listed suggestions for residence on the AZ Department of Water Resources http://www.azwater.gov/azdwr/StatewidePlanning/Conservation2/

 

Here are a few that were listed.

  • When landscaping use drought-tolerant plants
  • Minimize grass
  • Repair any leaking water lines
  • Check irrigation for proper function and make sure house or sidewalk is not getting watered.
  • Collect rain water for landscaping

 

  • Use a broom to clean driveways and sidewalks
  • Cover swimming pools
  • Use a shut off nozzle when washing your vehicle
  • Shut water off when brushing teeth
  • Choose water saving appliances

Conservation tips
List of ways to reduce water inside and outside the home.
Conservation_tips.pdf
Adobe Acrobat Document 72.3 KB

Changing some of these behaviors that are associated with the list above will be beneficial to everyone. Changing our behavior will make it easier to pass on our routines to our children. Letting others know about how water is brought to Arizona may make them think twice about overusing.

Published by: Paul Reyes

Water Conversation Incentives

Currently there are no water restrictions on usage for the majority of people within Arizona. Interestingly, the majority of water used by residents is used for landscaping, not inside the home. Some cities are taking efforts to help conserve water and alleviate this strain. Mesa pays its residents $500 for every 500 square feet of grass they remove. Scottsdale has a similar incentive plan. Arizona also offers a water conversation tax rebate for homes that install a rainwater/greywater harvesting system. This rebate can cover up to 25% of the cost of the system. Click here to learn more www.harvestingrainwater.com. This is just a small sampling of the incentives available to residents and businesses alike. Download the document below for a more expansive list on ways Arizona will pay you to save water.

Arizona Conservation Programs
03_2007ConservSummary.pdf
Adobe Acrobat Document 2.0 MB

Published by: William Harrell

Water Sustainability

Water sustainability has started with the US government and continues at the state level. LEED, or Leadership in Energy & Environmental Design, is a rating system for the design, construction, operation, and maintenance of sustainable buildings, homes, and neighborhoods. It is intended to help building owners and builders and be environmentally responsible concerning water usage, electric usage, and material usage. The US Green Building Council (www.usgbc.org/leed) grants LEED certification and has more information concerning becoming LEED certified.

Arizona is investing in water treatment plants, such as the Ak-Chin water treatment plant shown here. These plants use state of the art technology, such as membrane bioreactors, ultrafiltration, and GE’s ZeeWeed 500, to purify and treat groundwater, wastewater, seawater, and almost any other source of water available. Recently WaterWorld (www.waterworld.com) recognized Arizona for its use of these advances filtration technologies. Their site has more information about the systems listed.

Arizona has a well established Recharge Project system, or a series of underground water reservoirs to hold water for future use or when droughts occur. The following video will explain what these Recharge projects are and where they are located.

Published by: William Harrell

The Future of Water

ABC 15 news provided the following 10 points people should know about the water in Arizona. They highlight the current and future potential of the water supply specifically to the Phoenix/Tucson region of the state, also known as the Sun Corridor.

 

1. Rainfall in the Sun Corridor has little to do with water supply. Water is brought to this desert from the mountains

 

2. The renewable water supplies to the Sun Corridor provides enough water to theoretically support a population of 8-10 million people.

 

3. The Sun Corridor’s plumbing systems include reservoirs in Arizona, bigger reservoirs on the Colorado River and groundwater
banking. Together, these can typically store 4 to 5 years’ worth of urban Arizona’s water demands.

 

4. Climate change will probably increase variability of supply, and may reduce the “average” number by as much as 15%.

 

5. More than half of Sun Corridor water is still used to grow crops. Agricultural use has provided a buffer during droughts, when water for farming can be cut back to protect urban use.

 

6. Groundwater is subject to far more regulation in urban Arizona than in most states. We have purposefully put significant
amounts of water back underground for the last decade. Even so, the long-term goal of “safe yield” is a challenge to achieve and sustain.

 

7. Per capita use of water has been declining since the 1980s. The Phoenix area uses much more water for landscaping than Tucson. This reflects historical and climate differences in the two cities. But both urban areas have been consistently reducing consumption.

 

8. Reuse of urban water will be an important means of stretching water supplies in the future.

 

9. 2.4 million acre feet of average annual water supply appears to be a reasonable estimate for planning. At the current rates of
consumption, 2.4 million acre feet of annual water could support about 9.5 million residents in the Sun Corridor.

 

10. The Sun Corridor won’t run out of water, but it faces serious challenges about how to strike the right balance between population growth and lifestyle.

 

You can read more here:http://www.abc15.com/dpp/news/region_phoenix_metro/central_phoenix/new-statewide-water-report-released-concerning-phoenix-tucson-future-water-supply#ixzz2mNywixwb

The EPA lists Arizona as the second fastest growing state in the United States. This is only going to amplify the fact that Arizona is a desert and water is a scarce resource. Although lengthy, the following video details the the future of water in Arizona.

Another aspect of the future of water is how to adapt and expand our current usage and framework of water management. Below is a document taken from the Central Arizona Project detailing the current status of our water management and how Arizona's Five C's (cattle, copper, citrus, climate, cotton) have effected and will continue to effect the water management of the state.

Rethinking Water in the Arid Southwest
Water Future.pdf
Adobe Acrobat Document 559.0 KB

Published by: William Harrell

Welcome!

This site is an ongoing project of Dr. Perla A. Vargas and her students in Environmental Psychology at New College of Interdisciplinary Arts and Sciences, Arizona State University, AY 2013-2014.

 

© 2013-2014 Please give credit to authors when citing. The viewpoints expressed on this site are those of the authors and do not necessarily reflect the views and policies of ASU.

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