How can I stop flooding on my property (yard or basement) caused by discharge from my neighbour's downspout or sump pump?

Check your own lot grading. Most homes over five years have settlement around the foundation walls. Remember, downspouts only pick up roof drainage. If both houses have proper slope away and proper drainage swales then the discharge of the downspout and/or sump pump would be directed off the lot. Have you ever considered where your surface runoff would go if your neighbour's house was not there?



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1. I have installed a backwater valve, have a sump pump, and good lot grading, but I still get flooded. Why did this happen?
2. The downspout from my eavestrough is connected to the sewer pipe. Should it be disconnected?
3. What is the importance of good lot grading?
4. How does stormwater flooding cause my sanitary sewer to back up? Are there not two separate drainage systems?
5. How can I stop flooding on my property (yard or basement) caused by discharge from my neighbour's downspout or sump pump?
6. I live in an older neighbourhood. My neighbour has built a new house with a higher surface elevation than surrounding properties. Are there set standards for drainage elevation, and what should I do?
7. My neighbour's re-graded lot is higher than mine. What should I do to prevent flooding on my property?
8. My neighbour's new sidewalk is at a higher elevation and water runs into my yard. What should I do?