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After a particularly strong rainfall (every ~3 years), water seeps into my partially finished basement from small gaps in the intersection between the wall and floor.

Areas where the water seeps in

The amount of water is significant. Last time (a couple of weeks ago), it was about 6 gallons.

The floor and walls are poured concrete, with the wall having a coat of plaster.

The issue only occurs on one wall.

I've looked into a drainage / grading solution, and I don't think I can solve the problem there. With these rainfalls, half of my backyard will be underwater, and a nearby intersection can get about 2 ft. of standing water.

The side of the house with the issue has good grading (by my assessment), 8 ft. gutter extensions, and is a side of the house that the roof doesn't slope onto.

Outside of the house

Based on responses to other questions on this site ( How can I stop this water from entering my basement? and I have a basement floor with lots of moisture, can I paint or seal it to make it waterproof?), it seems that an ideal solution would be a foundation membrane, but I can't afford that, and the problem isn't severe enough to warrant that expense.

So, I'm wondering if using hydraulic cement in the wall-floor gaps would be enough to stop the water.

Close up of one of the openings

The gaps are small, so I believe I'd have to chisel out a larger gap to install the hydraulic cement properly.

I'd appreciate any thoughts on that idea or other suggestions.

If it makes any difference, my house does not have a sump pump.

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    I don't think anything you can do on the inside will solve the problem. Hydraulic cement may reduce the amount of water entering but it may force it in other areas. – Ed Beal Jul 22 '17 at 15:08
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    Sounds like you have a high water table and it is seeping in after a large amount of rain. You might need a sump drain system. – ArchonOSX Jul 22 '17 at 15:48

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