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Home | Farm Log | Installing a 5,000 Gallon Concrete Underground Water Tank for Rain water capture February 22, 2019
Installing a 5,000 Gallon Concrete Underground Water Tank for Rain water capture
This Farm Log details the ambitious project of installing a 5,000 gallon underground concrete water tank connected to our homes gutter system. This project was completed thanks to the help of Aherin Lee Cox, Associate Architect.
Dig Trenches for Piping
Start by digging the trenches that would connect two of the gutters on the far side of the house. We used schedule 40 4" pvc pipe and buried the pipes between 6" and 24" depending on area and grade. In general our pitch was 1" per 10' or better.
Cutting across the back yard
A 60 foot length the runs from the far side to the near side of the house to meet up.
Connecting the Near Side Gutters
The Y connector brings the two near side gutters on the house together.
All Four Gutters come together
All Four Gutters come together at the beginning of the driveway.
Bringing the line across the driveway
We started by cutting the driveway with a demo saw. After removing the 2 layers of driveway we excavated the trench between 2' and 2' 6". The 4" schedule 40 pvc pipe was placed inside of 6" crush proof pipe. The bottom of the trench was packed with small stone and continued a minimum pitch of 1" every 10 feet.
Dig a big hole for the 5,000 gallon water tank
We brought in a friend with an excavator to dig the 12 foot deep hole needed for the tank.
Preparing the hole for tank
After the hole was dug, we put in 6" of quary process stone and leveled it for the tank to rest on. Next we marked the corners where the tank would be placed.
Bringing in the 5,000 Gallon Concrete Tank
The crane easily picks up the 45,000 pound tank and begins moving it towards the hole. Our concrete tank has an internal dimension of 10'x10'x7'. The height of 7' is reduced to 6' 6" with the overflow seen in the top right of the tank. Calculating our Water Store 10' width x 10' length x 6' 6" tall x 7.48 (gallons per cubic foot) = 4,862 gallons of storage before going into the overflow space (5,236 gallons with overflow space)
Lowering the tank into the hole
The tank is slowly lowered into the hole as helpers on each corner nudge the tank with 2x4's to make sure we hit the mark at the bottom of the hole.
Sealing the top of the tank
With the tank lowered into the hole an adhesive layer is added to help bond the top of the tank and the base. Manhole steps will allow for the tank to be cleaned out at the end of the season.
Top of the tank is lifted in
With great ease the 10" top slab of the tank is brought in by crane.
Top slab is lowered in
The top slab of the tank is carefully guided in to fit snugly on the base of the tank.
Bringing in the lines to the tank
Temperatures soared into the nineties as we sought our best temporary shelter while working to bring the water line into the tank.
On and Off Valves for Water Flow
The Y connector takes the supply line coming under the drive way and splits to two on/off valves. The line on the left goes into the tank. The line on the right goes to a diversion line.
Diversion meets overflow
The line running across the tank is our diversion line. This is used when we do not want to take water into the tank. As the line heads down hill it is joined by the overflow line coming out of the tank.
Spill water heads south
The spill water coming from the tank overflow or the diversion are brought into a more flexible 4" landscape pvc pipe and diverted to a dry well.
Aherin Lee Cox
Aherin looks on as the crane brings the tank into the hole. Much credit is a due Aherin for his Architectural drawings and services preformed on the job site to make the project a success.
Foreman Finn
Foremann Finn kept a constant eye on the project usually from a cool patch of dirt.
Water flows into the 5,000 gallon water tank
All pipes in place and our test run here shows the water making it from our far side gutter to the inside of our water storage tank.
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