where did water go - plug sump

Old 06-10-15, 12:29 PM
Thread Starter
Join Date: Nov 2013
Posts: 98
Upvotes: 0
Received 0 Upvotes on 0 Posts
where did water go - plug sump

I was replacing a sump pump. Water was flowing into the pit so I put a test plug on the inlet. My floor drain is connected to the sump pit so I assumed the water would back up there.

It didn't. I worked with the plug in place for almost an hour and there was no sign of moisture. When I removed the plug there was an initial surge of water but no where near as I expected.

Where did the water go?
Old 06-10-15, 01:47 PM
Join Date: May 2015
Location: USA
Posts: 2,987
Received 110 Upvotes on 89 Posts
The sump pump pit is (or should be) the lowest point in your drainage system. When you plugged the inlet, the water level started slowly rising in the drainage pipes. They can hold a lot of water. For example, lets say you have 200 feet of drain tile connected to the sump (a 50 x 50 house with drain pipe running all around). 200 feet of 4 inch pipe can hold about 125 gallons of water. Assuming the floor drain is higher than any of the drain pipe, 125 gallons of water would have to collect before the drain would overflow. But that ignores the fact that the drain tile is perforated. The perforations mean all the gravel surrounding the pipes and under your foundation and slab are also part of the drainage system. All of those spaces have to fill with water too before the floor drain would overflow. That totals up to a LOT of water that has to collect.

Thread Tools
Search this Thread
Ask a Question
Question Title:
Your question will be posted in: