If a crack in your foundation has led to the formation of your own little Water World in your basement, you may be able to close the gap by this guide to foundation repair:
1. Excavate the area to access the crack or hole from the outside.
2. Use a pressure washer, scraper, steel brush, compressed air and/or other approaches and tools to clean the wall area in and around the leak thoroughly.
3. Use a brick or pointing trowel to pack large voids with hydraulic cement, which you can apply to a wet surface. When it dries after a few days, brush on foundation coating and backfill.