Environmental Engineering/Design of Gravity Sewer

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Question
Dear Mr. Zubedi,

In designing gravity sewer network, the minimum velocity we use is 0.6 m/s . Can we go lower than this the pipe line is more flat thereby reducing the number of intermediate pumping stations required. In a large Island with limitation of excavation depth by the regulators we are having faced to use too many pump Stations. What could be done to avoid this.

Thank you,
Hawa

Answer
Dear Hawa,
The concept of maintaining this velocity is, as you may well know, is to maintain a self-cleaning velocity. This does not mean that you should always maintain this. If a design requires to increase the velocity, so be it.
Another alternative can be that there is a single main sewer collection tank with a water P trap for foul smell and  vacuum and/ or pressure pumping arrangement. Mechanical Pigs may be used for cleaning pipes.

I hope this answers your curiosity and if you require further assistance, contact me separately.

kind Regards
Tufail Ali Zubedi
Sustainability & Environmental Consultant
http://www.SPMCpk.com/  

Environmental Engineering

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Tufail Ali Zubedi

Expertise

Environmental engineering -- Air Pollution -- Solid Waste Management System -- Environmental Managment System based on ISO 14001 -- Water Treatment and distribution -- Wastewater treatment and distribution -- Environmental & Energy Auditing -- Resource & Energy Conservation -- Environmental Impact Assessment / Statement -- Global Warming --

Experience

Environmental engineering -- Solid Waste Management System -- Environmental Managment System based on ISO 14001 -- Water Treatment and distribution -- Wastewater treatment and distribution -- Environmental & Energy Auditing -- Resource & Energy Conservation -- Environmental Impact Assessment / Statement --

Education/Credentials
1. Masters in Environmental Engineering - NED University of Engineering & Technology. Karachi. Pakistan 2. Bachelors in Civil Engineering - Mehran University of Engineering & Technology. Jamshoro. Pakistan

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