So, my north-facing basement wall leaks a bit due to natural slope of the land and 60-odd years of deterioration to whatever coating and drainage might be on the external side of the wall - but it'll get particularly bad in about a month as things warm up and the snow we've got here (currently around 18" deep) melts. (By 'bad" it's not horrible, but enough to end up with a couple of puddles and musty rooms, preventing the space from being made more habitable)
The plan has always been to see if I can't make a drainage channel on the interior side of the wall (the basement has a concrete floor) which will direct any water ingress to one end, where there's an unfinished section of floor about 3'x3'. I can dig down and put a tub in that unfinished section, and I have a sewer pump which can sit in it and pump accumulated water out - although initially just directing water into the sandy dirt will probably do and allow it to soak away naturally.
Anyway - thoughts on the best way to do this? I was thinking about pouring concrete between a couple of forms to create a 'wall' about 3.5" wide and 3" high, but will new concrete likely adhere to the old OK, or should I be thinking about scoring the old concrete to provide a better key? Also, is treatment of the channel using some kind of rubberised product wise, or will 3" of concrete form a natural barrier without (as long as it doesn't ever crack)? I'd like this to last at least 50 years, after which I won't be around to care :-)
If I do the 'wall' approach then the plan will be eventually to put a false wall on top extending up to ceiling height (leaving a 1-2" gap between it and the real basement wall behind), but for now I think I'd just embed some J-bolts or concrete anchors into things (letting them penetrate down below the concrete floor level) and leave that project for another day.
Cheers,
Jules