06:52PM | 07/27/05
Member Since: 07/26/05
1 lifetime posts
I built a new bathroom about a year ago and the new toilet I installed will not flush for a day or two after a heavy rain. The roof stack vent is also new and a shower and a sink share this vent. The shower and sink drain are unaffected by the rain. I have snaked both the toilet and the stack vent and it didn't help. The toilet is made by Ammerican Standard. I have a well and septic, if that helps. Any suggestions?



06:10AM | 08/04/05
Member Since: 08/29/04
227 lifetime posts
When it rains heavily, septic systems act in the reverse and water runs into the house. If your lower level doesn't have a backwater valve attached to it, this can be a problem. Imagine you are going to install the distribution lines (leech field) on a septic tank. You dig a trench about 18" wide and 24 inches deep. You install a pipe that has holes in it and fill the area with gravel. All the ground around this new trench is undisturbed compacted soil. As soon as it rains, the trench accumulates the water and it backflushes into the septic tank. If the pressure becomes too much, the water runs up out of the toilet and floor drains. If your ground is just too moist with a septic tank, you will get very little drainage. Then the water that you flush from your up stairs toilets will come out in your lower level, since the ground can no longer absorb it. Its like when you get a sponge too wet, it will no no longer pick up spills til you ring it out. The ground has to be dry for a septic tank to work. After a few days the ground is drying out.

The reason the other fixtures work, is because they drain much more slowly than a toilet. A toilet is an instant flush of a large volume of water. A couple of problems happen with a septic, that is full because of groundwater. Toilets don't want to flush. When you try to push a large volume of water into a container already full, there is no place for the water to go, because there is air already in the line. Suppose you put a straw in a glass of water with your finger on the end, the straw will remain empty, because the air has volume. If you remove your finger, the water will enter. The water in the drainfield is like a finger on the end of the straw, it forms a plug. Therefore, the air inside the pipes resists the water trying to enter in a large volume. Whereas the water entering from a small pipe, enters along the side of the pipe and exchanges places with the air, that heads up to the roof.

Good Luck


Raymond VinZant Plumbing Prof.


Post a reply as Anonymous

Photo must be in JPG, GIF or PNG format and less than 5MB.


type the code from the image


Post_new_button or Login_button

Colorful, useful, and fun, these tire planters form the foundation for a delightful container garden. Just spray-paint old... Reused steel windows create an eye-catching splashguard in this walk-in shower. The vintage factory windows bring an inter... A galvanized steel tub is a surprising but charming fixture in this bright and breezy screened patio. It's perfect for was... If you're not crazy about the idea of commingling plants and pool, this modern variation may be more to your liking. The s... Yes, a freestanding garage can become its own tiny house. Artist Michelle de la Vega has all the comforts of a modern resi... If you lack plumbing skills but have a good sturdy tree, here's the easiest outdoor shower solution of all: Simply attach... Pursue what's known as the stack effect. To achieve it, open the windows on both the upper and lower floors, and as warm a... How do you like this smart use for an old bottle? Clamp an empty wine bottle to a fence or wall near your outdoor deck or ... Simple and striking, a couple of pieces of "lovingly used" furniture creates a special kind of charm. A weathered chair fo... Twine lanterns add pops of crafty—but sophisticated—flair to any outdoor setting. Wrap glue-soaked twine around a balloon ... When securely fastened to a tree or the ceiling of a porch, a pallet and some cushioning make the ideal place to lounge. V... Incorporate nature into your lighting scheme by securing a dead tree in a concrete mold and draping your pendant lamp from... For the cost of a can of exterior paint , you can totally transform your porch. Paint the floor a hue that complements yo... In this urban apartment, a standard-issue patio became a serene and green perch by replacing the typical concrete with gro... This garden shed has been decked out to the nines. Designer Orla Kiely created the intimate home for a flower trade show, ...
Newsletter_icon Google_plus Facebook Twitter Pinterest Youtube Rss_icon