Question from a begineer

[gkar68]

Hi there
I am a software programmer, using GIS software
and I am building a GIS model for the Sanitary network
I am learning about the sanitary network, but I dont have enough resources
I have many questions:

1 - my client has database for its manholes, and in the database and for each manhole there is one (only one) inlet pipe and one outlet
I know that one manhole can have more that one inlet and only one outlet, is that correct?

2 - what is the "Branch Inlet pipe"?
my client has for each manhole 2 Branch Inlet pipes


3 - is there any source on internet , that describe and define the terms used in Sanitary systems


thanks a lot for your help

g.

 

[RWF7437]

You may want to buy Dictionary of Engineering Terms
by Roger Timings (Author), Peter Twigg (Author). It is illustrated and available at Amazon, B&N and elsewhere.

 

[Maury]

You are correct that a manhole can have multiple pipe connections.
"branch inlet connection" is something I'm not familiar with. Inlets are storm sewer structures. Could this be a combined sewer system that handles storm water as well as sanitary flow?

 

[BrianIreland]

THere can be two or more outlets. Usually either if a system works in a circuitous way, the additional pipe may be off loading flow to less strained pipes, or (more usual) if a storm overflow pipe is in operation. This works whereby if the flow builds up in the pipe, it is discharged directly to an outfall as it is assumed to be storm water in a combined system. The second outlet pipe, in either case above, will be higher than the main outlet pipe.

"Branch Inlet Pipe", in my opinion, is just another inlet. Is there an angle associated with this. If two branch inlets, I guess that's three in total, one main and two branches. I presume the word "inlet" just confirms that that it's not an outlet.

Also beware of Back-drop Manholes. This is where the manhole would have been coming in at a higher level, but to reduce friction losses, etc., the pipe is lowered "dropped" before the manhole. The higher level is maintained to be able to stick rods up for cleaning. The give-away with this is that the pipes will be coming in at exactly the same angle.

Word Of Advice: In this business there are lots of words flying around that may mean different things. I've been working in this area for over 5 years, including GIS software, and I dont know exactly what the term you ask means. So my advise, dont worry about having egg on your face, it wont happen. Just ask the client for confirmation regarding the meaning.

Good Luck.

 

[waseem19]

1- Yes , it is correct , this is the way your client sets it then you should follow.

2- The branch inlets are for future connection, they are not pipes ,just ports ,a closed hole in the manhole base to allow for a pipe to be connected in the future, you need them if you expect to have flows coming from this branch side. the manhole base it self will have a different shape (more costly) than a manhole without the future ports.

3- I don't think that you will find any dictionary that addresses all the terms you might here about , normally clients have some sort of design manual or general guidance books written by them, check for one. if they don't have just ask and start writing down everything you learn