Where I used to live we had to have 2 fences as well. We had our regular back yard fence and then bylaw made us put an entire fence around the pool with a pad lock at the top gate. This was all on top of the regular 8 foot fences our yard had for an above ground pool. Durham is really really picky and anal about pools and fencing.

We moved a year ago and now have an inground pool. Needless to say my backyard is COMPLETELY off limits. No daycare children allowed out there at all. Scary to think it only takes a second for something to happen. I know that I watch my dck's ALL the time, but they are kids and things happen. For me, its easier to keep that area of the house off limits.