one or two drain pipes?

[6855]

hi, i was asked to work and a correction on grading plan and am having a hard time on one of the comments on the plan. basically we have a pipe running from a sump pump at the back of the property (lower elevation) to the street though a curb drain, and one catch basin in the front near the property line. original design had the catch basin drained out to the street by gravity throuth a separate pipe. now the plan checker is asking us to combine the two pipes into one before leaving the property. i was wondering how would we combine a gravity flow pipe with a forced pipe? and will this be more economical than using two separate pipes? by the way, using two pipes is allowed by the code.

pls help.

thank you

 

[dicksewerrat]

Use the catch basin as the end of the force main. then icrease the pipe to the street.

Richard A. Cornelius, P.E.

http://WWW.amlinereast.com

 

[cvg]

most agencies will not allow pressure flow into a gravity storm drain or into the gutter. As Dick says, the correct method is to discharge to a catch basin and then gravity to the street.

 

[emmgjld]

An added advantage to the catch basin discharge is the operating sump pump and discharge may be obvious.

In my dry part of the country, an operating sump pump often indicates a problem. If the discharge is hidden or not very obvious, the flows are oftentimes not noticed and are not investigated.