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Capturing Rainwater in Underground Storage Reservoirs

Back in the ancient days of man in Greece and Turkey we find remnants of water storage reservoirs.

Demand for water is outpacing the supply. Soon water storage reservoirs will be required to not only accept the rainwater but to also be utilized to reduce runoff into our storm sewers.

During each rain shower we  capture as much rainwater  that we can hold and store this rain water  in underground reservoirs to later be used to irrigate the landscape.  By using our underground rainwater collection method in conjunction with the hollow sand and humectants in the soil profile, we can virtually turn off the local water supply for outdoor  irrigation  and reduce the water bill  by 75% or greater. In certain parts of the USA we can completely unhook from the local water supply and use only rainwater and our daily made water to keep the landscape thriving and growing healthy.

Rainwater Harvesting

Rainwater harvesting is the process gathering falling rainwater from your roof, patio or land surface into storage containers and reusing it for many different purposes instead of importing it from city pipelines by processing if after intake from lakes and rivers.   By simply capturing water on a 1500 square foot surface, a household can reduce their water bill by 50% and save 43,000 gallons of water a year!

What are the benefits to Rainwater Harvesting?

  • A good source of water during a seasonal drought.
  • Can reduce the volume of storm water run-off, lessen the impact on erosion and decrease the load on storm sewers.  This will keep potential storm water pollutants out of the city’s rivers,groundwater, and streets.
  • Great for landscape irrigation and reduces the demand for limited surface and groundwater supplies.
  • Helps utilities reduce the summer demand peak of water treatment plants.
  • Saving Money!  Operating costs for rain water harvesting systems are substantially lower than the cost for purchasing water from the centralized city water systems.


As you can see in the above depiction, the rain is collected from the downspout and then  this water is is transferred into an underground rain reservoir. Above the reservoir  a pond can be installed that uses this stored water or even a small waterfall  can be installed

WE DO NOT USE AN ABOVE GROUND STORAGE SYSTEM......OUR STORAGE RESERVOIRS ARE ALL UNDERGROUND - We focus on aesthetics rather than focus on function.

The need to build an underground reservoir is very difficult if you try to purchase a pre-made rain storage system; in order to install a premade system underground you have to match the size reservoir ( which is very bulky an you need a crane to lift and install) to the space available. We eliminate this issue by actually building our storage reservoir on site and its size is based upon our total water needs for the project and the underground space available to build the system.

As you see in the above image there are porous boxes ( Aquablox) in the ground. In the above image  there are a total of nine Aquabloxes installed into an underground hole. additionally another two  Aquabloxes are installed in another location. The two reservoirs are joined to act as one bigger size reservoir.

Each box is made out of recycled plastic and is snapped together to fill out the hole in the ground. The hole is dug into a rectangular shape and each of the porous boxes are stacked inside the hole to generate the core structure of the underground reservoir. Once the reservoir is completed, you can actually drive a car above the reservoir without worries of the porous boxes collapsing. This is a engineered system that was originally developed in Australia  for storage of water under parking lots.

Below you see two sizes of porous boxes

As you can see from the two Aquabloxes above they come in different sizes  based upon the hole depth and width it allows you to stack multiple size boxes together.

Below is a depiction of a typical underground water reservoir installation:

Step 1: Dig Hole  In this example the hole is 10 feet by 12 feet and 6 feet deep

Step 2: Install an impermeable liner ( like one used for outdoor ponds) and fill with the porous boxes stacked inside the hole.

96 Porous Boxes were Used

This is big enough to contain 3,000 Gallons of  Storage.

Step 3 : Fold Over the liner, install the  and cover with rock aggregate.

After the reservoir was completed by  securing the pond liner then the box was covered with base gravel.

In this application, a brick patio was built on top of the reservoir.

If this were a yard  area,  new sod could be planted or a flowerbed installed over the top of the reservoir.

Step 4: Cover over the finished reservoir with grass or walkway

Finished Product :  a 3,000 gallon reservoir was installed underground. A brick patio was installed over the reservoir and a small water fountain rock was installed above the reservoir.

One of the most important features is the downspout and how to hide the reservoir intake feed. If the building structure has downspouts, then we can easily capture the rainwater as seen below. If there are no downspouts, then we need to contour the landscape to drain all the water to a localized point in the landscape and remove this water from a sump pump system.

As you see the above photo, here is what is under these rocks which hide the intake of the reservoir system

Grated lid and layer of gravel removes large debris, such as leaves and twigs

Smaller particulates are captured in a 300 micron, easy to clean debris net

Molded hose-tail stub fits 3” or 4” corrugated drain pipe

In a residential setting we can put a reservoir in any location

Before the hole is dug , we lay out the blocks on the ground to determine the size hole to dig

The hole is dug out and a pond liner is installed prior to snapping the porous blocks together to act as the rib cage for the reservoir.

The Reservoir Hole is 6 feet by 9 feet by 4 feet deep

16 Porous Blocks installed is 500 gallons.

Cover over the reservoir and install a small water feature above the reservoir.

Water Feature

Regions with Rainwater Regulations

•Tucson, Arizona:
–The first municipality in the country to require new commercial properties to harvest rainwater for landscaping. 
–They are now implementing similar requirements for residential developments.

•Santa Fe and Albuquerque, New Mexico:
Require new homes to use rainwater harvesting.

  • Austin, Texas
  •  www.ci.austin.tx.us/watercon/rainbarrelprogram.htm

Rebates of $0.50 per gallon of capacity for non-pressurized rainwater harvesting systems (i.e. rainbarrels) and $1.00 per gallon of capacity for pressurized rainwater harvesting systems (i.e. large cisterns with a pump) are available for qualifying purchases made on or after July 1, 2010. Rebates are limited to no more than half the project cost with a lifetime maximum rebate of $5,000.

Inquiries and Questions:                info@h2oconservationtechnology.com

Call Us Today: 281-842-2050

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