beppington
Elite Member
Back before we built I wanted elevations but at least the surveyor that we used said he could not make a determination based on elevations because there are no "base elevations" in the area. I took this to mean that although he might be able to establish that house pad is 670, there is no elevation for the flood plain. Maybe technology has improved and I try this approach again
He might've actually been referring to terrain elevation benchmarks. My property happens to have a couple of them along my roadside property line, so it was fairly handy for the surveyor to go off either of those benchmarks to determine the ground elevation at that stake I mentioned I set. Those BM locations & elevations were determined by the local water management district many years ago.
When I built the house there was no question in my mind that it was above the flood plain. And we raised it up some more. But whereas the old maps had about 10 of my 24 acres in the flood plain, the new map has probably 22 in the plain! Its like they raised it up several feet, so I can't be sure if it is now up to my house or not. The new map has my house totally inundated. I might understand if this were a major river, but its just a seasonal creek that begins only about 6 miles upstream.
Well, if somebody didn't know better about my property, they could easily not know it has flood potential: Right now the entire 60 acres is bone dry ... yet ~59 acres of it is in the FEMA flood plain. Oh, & about 50 acres of it has been designated wetlands.