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Author:
rmusa (MD)
Counter map for street sewer main:
[files.engineering.com]
How to read counter map?
Are A and B invert elevations or rim elevations? Can both be determined by this number?
How can we find the elevation of the house? C
Is E and F the elevation of street or house? Generally there are 4-5 steps up to first floor of house in front yard on this street.
For D it is a 10” sewer main. What is meaning of 23-83?
For G is R=4.77 the slope of ground?
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Author:
hj (AZ)
HAve to do a little guessing here
A. inverts
B. invert
c. The map has NOTHING to do with any construction that would be done on the lot. it is strictly raw ground numbers. You CANNOT determine floor elevations.
D. Usually the distance between two points, although I cannot figure out which two points, since the manholes appear to be approximately the "standard" 660' between them.
E & F. probably elevations of markers at the lot corners
G. possibly the change in grade of the alley surface.
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Author:
sum (FL)
This looks like an old map all hand written. Many times these numbers are lifted from other drawings and you may need to talk to the department to find someone to point out their meanings. If they lifted numbers off design drawing vs as built drawings the numbers could have different meanings. If you can get design drawings or recent construction survey drawings of the same area to cross reference it would be much easier to decipher.
As for house elevation that information should be on your property survey.
Down here in South Florida we have to indicate the elevation and it's reference vertical datum and that information is needed to determine if you need to buy flood insurance and if so what flood zone you are in. That elevation is not the "Finish floor elevation" but "the lowest elevation in the house" for flood purposes so in many cases it is the elevation of the garage floor. That elevation information is available from FEMA since they are the one who buy the insurance from. Go to FEMA's web site and see if your area has FEMA data and most likely you can get the elevation for flood insurance purpose from there.
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