Oasis Water Harvesting - Sierra Vista, AZ 520-234-7681 Facebook square blue small Twitter square blue small Google+

All pictures shown on this site are the products and efforts of Oasis Water Harvesting


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The Rosen building project was the first commercial job for Oasis Water Harvesting in the spring of 2012.  The building was designed specificially for rain water harvesting with a single scupper in the back of the building along with a back up scupper.  The 5,200 square foot roof area will produce 44,304 gallons of water in a normal year.  We used a 10,000 gallon welded galvanized steel tank and a Monroe Brain Box which switches  over to a  master valve when there is not enough rain water in the tank thus converting over to pressurized municipal water for the irrigation system.  A Grundfos 1HP MQ series pump was used.  We worked with licensed contractors to complete this project.

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The Pueblo Del Sol Country Club projcet was the second commercial job for Oasis and built in the spring of 2013.  This finished project was awarded by the American Rainwater Catchment Systems Association (ARCSA) as the best commercial rain water harvesting project built in north America in 2013.  Oasis really had to think outside the box on this one.  We utalized 15,500 square feet of surface area which was two tennis courts and 1500 square feet of a nearby building roof.  This surface area produces 10,200 gallons for every 1" of rain or a total 144,840 gallons per year. That water empties through a stem wall with two 4" pipes  onto a concrete parking lot used for golf cart parking.  In the past this was a flooding problem for the golf cart barn.  This water now empties into a burried 1,000 gallon concrete cistern after first going through a custom build basket strainer.  In this underground tank is a 3 hp sump pump which transfers the water into a 30,000 gallon above ground tank at a rate of 270 gallons per minute through 6" pipe.  The brain of the whole system was built by Monroe systems out of Grand Junction Colorado.  It utalizes the latest in technonogy incorporating transduces instead of the old float switches to measure water levels in both the above ground and below ground tanks.  When the irrigation system goes to open an irrigation valve it sends a signal to the brain box which either turns on the pump if there is enough water in the large above ground tank or in low water conditions opens a master valve that supplies municipal water to the irrigation.  In a rain event the transducer works in the underground tank to tell when to turn on and off the 3 hp sump pump.  These levels are easily changed at the electronic brain box making getting inside a tank to do these changes obsolete.  Currently once the water level gets to 3.5' deep the pump is turned on, once the level gets to around 10" the pump is turned off.  Ewing Irrigation in Tucson was a big help in working with Oasis to install this new technology.  Funding for this project was provided by the Cochise Water Project.

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In the fall of 2013 Oasis installed a 5,828 gallon welded  galvanized steel tank at the Boys and Girls Club of Sierra Vsita to flush 8 low flow toliets in the bathrooms.  The 6,325 square foot roof will produce 3,795 gallons of water with one inch of rain, that is 53,889 gallons per year.  The tank is 8' in diameter and 15' tall.  A custom pre filter built by Oasis filters out any large items before the water enters the tank.  A float switch inside the tank is linked to a 12 volt motorized ball valve that allows municipal water inside the tank to maintains a minimum water level in case of a long period of no rainfall.  An extensive overflow system using 6" pipe brings any overflow out to the front parking lot and street eliminating any flooding in the back of the building.  Funding for this project was provided by the Cochise Water Project.

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Fire Stations

Boys and Girls Club of Sierra Vista

Pueblo Del Sol Country Club

Rosen building




Starting in the winter of 2015 Oasis in partnership with South West Desert Images started installing rain water harvesting systems at all 5 of the area fire stations.  This was both for the Fry Fire District and the Sierra Vista Fire District.  This water is to be used for truck washing and in some cases truck filling.  This is another effort to cut down on ground water use for something where rain water can actually do a better job.  With rain water you do not have the spotting associated when using hard ground water to wash vehicles.  We used Bushman 5,000 gallon tanks at all of these locations.  Depending on the size of roof and available space for the tank(s) the number of tank(s) at each location varied.  Two stations got one tank, two stations got two tanks and one station got 3 tanks.  No back up water systems were installed but each tank got a water level indicator so that the firemen will easily be able to see when they are about to run out of rain water. Grundfos 1 hp MQ series pumps were used.  Facuets were installed at convenient locations where truck washing is done.  This project was funded by the Cochise Water Project.

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Sierra Vista Schools Bus Barn

The summer of 2015 saw the addition of a 5,000 gallon rain water harvesting tank used to wash the district school busses.  The 5,000 square roof surface area will produce 3,000 gallons with one inch of rain or 42,600 gallons per year.  This project was one of many where Oasis teamed up with well knon and established South West Desert Images.  We also started using a new pump by Grundfos that is a submirsible pump that saves a lot installing costs and time and even has better flow rates and pressure than the traditional MQ series of pumps that have been so popular in the rain water harvesting industry.


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Ramsey House Natural Preserve


The Ramsey House is a popular birding destination with a prenineal stream running along side their hiking trails.  It is owned by the Nature Conservatory. Here we set up two seperate systems.  The one in the front along side the creek is pretty straight forward using a Bushman 1320 gallon tank with a 1HP sump pump inside that supplies pressure to a facuet used to supplement water for landscaping.  In the back we had to be a little more outside the box.  They wanted two large tanks up hill from the watering area so they could water landscaping with just gravity.  We also did not want any large tanks up next to the building for the aesthetics.  We installed a 200 gallon tank just off the back of the building that is underground and has a sump pump inside it along with a 3" overflow that empties into the creek.  The pump has to pump the water up about 15' into one of two 1500 gallon tanks that are linked together.  We also included a 2.5" Fire hook up location on one of the 1500 gallon tanks in case of a fire emergency. Due to many trees around the building both downspouts for the front and rear systems use a Leaf Eater to help with keeping leaf debri out of the basket strainer on both systems.  The instillation was done by the staff at the Ramsey house and designed,  oversight and parts supplies by Oasis.  This project was funded by the Cochise Water Project.

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Commercial Rain Water

Harvesting System Examples