Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!
  • Students Click Here

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

Related Articles


Abbreviations used on Historical Sewer Plans

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.

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members!


Close Box

Join Eng-Tips® Today!

Join your peers on the Internet's largest technical engineering professional community.
It's easy to join and it's free.

Here's Why Members Love Eng-Tips Forums:

Register now while it's still free!

Already a member? Close this window and log in.

Join Us             Close