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Old 10-29-2012, 10:53 PM   #1
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Backwater Valve Installation

We have just had a backwater valve installed as part of our drainage system which sits about 38 inches below our basement floor.

In order to provide access to the valve (for maintenance purposes), 2 1/2 valve boxes which create a hole above the valve were stacked one top of the other bringing the last box to the basement floor level.

The problem is - the hole fills with water which covers the valve with about 18 inches of water.

We've drained the water out, but within a few hours the hole has filled up again to about 18 inches. It seems to vary slightly 1-3 inches for now. We can actually see a small stream of water flowing back into the hole.

We've asked around...and get a variety of rationales; water table is high, water is normal, don't worry the water is safe, plumber should have built a self-contained box to prevent the ground water from entering the valve box..

Is this normal? What can we consider our installation to be up to standards? Should the valve be sitting in 18 inches of water? or should it be in a dry pit? Will water rise even more and pose a flood threat to the basement? Is the stagnant water a health concern?

The attached top view picture (drop box) shows the first 1 1/2 valve protection/access boxes, the third box is submerged under water and the backwater valve sits on the very bottom of the hole.

Help! thoughts, course of action. [IMG]


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Old 10-29-2012, 11:17 PM   #2
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This link shows the type of backwater valve I use- no boxes needed.
You don't want stagnate water.


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Old 10-24-2014, 09:52 AM   #3
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Hi CCCron,

It's obviously been a couple of years since you posted your message but I'm wondering if you've had any issues with the water in the hole where the backwater valve was installed? I ask because we recently got one installed and have about 10" of water inside the hole as well. Thanks.
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