splitter manhole
splitter manhole
(OP)
Hello,
I need to design a manhole to drop over an existing sewer main to divert a variable portion of the flow to a new main. These seem to be most commonly referred to as "splitter manholes." I intend to make the new invert out the same as the existing invert out but am not sure beyond that. Can't find any literature or details on this. Can someone point me in the right direction?
Thanks.
I need to design a manhole to drop over an existing sewer main to divert a variable portion of the flow to a new main. These seem to be most commonly referred to as "splitter manholes." I intend to make the new invert out the same as the existing invert out but am not sure beyond that. Can't find any literature or details on this. Can someone point me in the right direction?
Thanks.





RE: splitter manhole
Richard A. Cornelius, P.E.
WWW.amlinereast.com
RE: splitter manhole
RE: splitter manhole
RE: splitter manhole
Richard A. Cornelius, P.E.
WWW.amlinereast.com
RE: splitter manhole
http:/
RE: splitter manhole
What do you mean by variable flow? What you are trying to accomplish?
Assuming that you are using the same invert elevations in the new manhole, there is no reliable method that will split the flows proportionally while the flow changes.
The information submitted by nackra shows overflow devices that will allow the sewer to overflow not split the flow.
Any type of weir that you will install is going to cause backwater in the sewer resulting in solids in the bottom of the sewer.
So maybe you can provide a functional description of your splitter manhole.
RE: splitter manhole
Thanks for the responses, I appreciate it.
RE: splitter manhole
RE: splitter manhole
I've done this with a normal flow through manhole containing side overflow weirs so that during normal flow, the flow goes down the main line. Then during high flows when the pipe is full, the excess water can spill over the sides to the eq basin or such.
This does not allow real tight control on the water flowing through the main line.
A modification I've also used is to insert a v-notch weir into the main flow and still have the side overflow weirs. The v-notch keeps the main flow in a pretty tight band.
You just need to size your weirs to meet your needs.