Waterproofing puzzle.

1. Rainfall in an hour 2.6 inches, roof is 1300 sf, water in an hour 2100 gallons.
2. Some water overflows the gutter on the top and just flows down the wall, down the pitched paved area and to the soil in the backyard.
Most of the water goes down the gutter and to the sewer line, sewer line (and drain line) could not take all the water and pass it through.
3. Some water by the pressure shoot through the axillary drain that is connected to the sewer line next to the roof drain connection in front of the basement door.
Door has a high threshold, double door, basement inside is finished, there is a drywell inside by the door.
4. When water got inside under the door and flooded the basement water accumulation was about 1 inch on 700 sf (the rest of the area of the total 1300 sf footprint is 1 foot higher and was not flooded), so, we estimate the volume that did not drain and flooded the floor as
430 gallons (plus 60 gallons of water that filled a drywell by the entrance.

If we put a sump pump in this square landing just outside the door – where those 500 gallons have to go?
This “extra” water got inside exactly because it could not push to the sewer line to begin with, so, sewer line is out of the picture.
Our backyard is 20×16. It is paved 35-40%,
It has one more drywell in the paved area. This is all we have.
We talked to a couple of waterproofing ppl.
We are collecting ideas and brainstorming.

lucie

in General Discussion 1 year and 8 months ago

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lucie | 1 year and 8 months ago

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Also, there is one similar in HD.

lucie | 1 year and 8 months ago

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Speaking of submarine doors…
this is what I found :
Dam Easy® Residential Flood Barrier
https://store.floodproofing.com/dam-easy-residential-flood-barrier-p20.aspx
At $899 and easy to install – it is worth trying I think.

lucie | 1 year and 8 months ago

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Yes, I need a submarine door! 🙂
It is a good idea, but I doubt it will withstand the whole volume. Even the fifth part of the volume.
I am thinking about the size of 90 gallon trash container: Can any regular door withstand even 100 gallons?
We have to figure out where 500 gallons of water will go.
We were thinking about connecting the sump pump to the water tank with the capacity of 200 gallons and then overflow to the backyard. If we do not want to flood our poor neighbors ( the ones that are opposite have backyards that are lower then ours ) then we will have to cover all of our backyard with drywells. It is easy to do plastic cans, but we would need at least 4 of 60 gallons – it is all space that we have.
Besides… rats is a big issue in Brooklyn.
What if rats will come to our backyard, start to dig and destroy drywells with the top layer collapsing?
Create a cement pool? The yard is tiny.
There is a lot of city underground infrastructure pretty close to the surface as well ( this is not guessing, we know for sure).

xuytbjicwnofjdde | 1 year and 8 months ago

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Can the door be any tighter, to withstand the pressure of water pushing on it trying to make its way in? Some of these passive house rated doors are thick and 100% air tight – I imagine no water gets in. You basically create a pool outside your basement door and wait out the short period where water is coming down so fast.