Matching Pipe Crowns
Matching Pipe Crowns
(OP)
A good hydraulic practice is to always match pipe crowns in a manhole for a sanitary or storm mainline. However I was reading that you should match 0.8D elevations between pipes. Can anyone expand on that and the reasoning behind it? Thanks





RE: Matching Pipe Crowns
in other jurisdictions, crowns are matched which increases head losses due to the drop at each junction. it minimizes trench depth.
for design maximum flows at about 80% full flow, matching 0.8D results in a WSL which is smoother, theoretically less head loss at design flow.
in most jurisdictios, a drop is required at each manhole to account for manhole losses which makes it difficult to match anything
RE: Matching Pipe Crowns
RE: Matching Pipe Crowns