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Abbreviations used on Historical Sewer Plans

Abbreviations used on Historical Sewer Plans


A client of mine obtained a copy of the original sewer plan for his collection facility. It was prepared in 1904. There is a list of data at each sewer main. I am trying to understand what many of them mean. I was wondering if you might be able to help. I attached a shot of a portion of the map.

The first abbreviation is D. This is clearly distance manhole to manhole. F is the elevation drop. G is the grade in %. With the A.C., I am a little uncertain. My initial impression was average cover. I tried calculating it by averaging the depth at each manhole, (d-up + d-down)/2. But the calculation is not exact. maybe if A.C. is average cover they were using a weighted average from sewer profiles?

Have any thoughts?


RE: Abbreviations used on Historical Sewer Plans


I think your spot on with your thinking.

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