ISO "Built Upon Area" Question
OK ISO gurus who helped me on the needed fire flow question, now I have another.
What do they consider the "Built Upon Area" of the city for purposes of locating an engine within 1.5 miles and ladder within 2.5 miles.
If we take the "obvious" definition of the total district we protect (about 25 sq. miles) we cover just about half the land area within 1.5 road miles of the two stations.
However, in that 50% of territory is probably 85% of the structures...and I'd sure like to use 85% as the multiplier in the formulas than 50%. (Yes, I do have the aerial photography available to count the structures!)
Complicating the picture is like all of Southern New England, all the land is incorporated so you can't say "within city limits" and most of the town is 2 acre zoning, so you can build a house just about anywhere, and there is neglible park lands, so we realistically can't try and say "that land shouldn't count cause it can't be developed"
Anyone know an answer?