This is one I'm very very familiar with in my currently frustrating attempt to find a house with pool, or house with a lot that could put a pool in on the East Side of Cary / Raleigh / Lake Wheeler. Most of the houses I seem to look like candidates in the Lake Wheeler area, are stuck in either the 6% (which is a fixed cap) or in the 12% (which can go to 30%) with approved mitigation. Very tough in the 6% critical area, as the houses I've looked at were built prior to the impervious surface regulations are all over 6% already. 12% can even be a challenge.
Anyways, here is what I do:
1. Use Raleigh IMAPS, and use the layers function on the bottom right. One of them will identify what watershed you are in, whether it is in the Critical for instance. This allows you to add various layers to the map, such as topo lines, floodplains, watershed info.
2. Use the arrow in the upper left to click on the lot, and pull up the lot properties. That will tell you what zone the lot is in.
3. You also need to know if the lot is Classified Urban, Suburban, Rural, etc. That also makes a difference.
4. Also makes a difference if you are on city water and sewer.
This table helps:
http://www.wakegov.com/planning/grow...creek_lmp1.pdf
So does this one:
http://www.wakegov.com/planning/maps...egulations.pdf
Or just contact the watershed manager via email and get the answer directly :-) The email addresses for the various managers are online. I have found the Swift Creek manager to be quite helpful and quickly responds to emails.
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