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?

A new house built in an older area is called in-fill housing. In these cases, the builders must conform to the provisions of the Property Drainage Bylaw and the Development Standards and Procedures, which prohibits drainage onto adjacent properties. Matching the existing grade at the common property line is normal practice for these developments. Adjacent homeowners must consider their own grading. 

They should be aware that under the Property Drainage Bylaw and the Development Standards and Procedures, new homes are required to have a 5% slope away from the foundation walls.

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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?