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Design of Water Supply and Sanitation System for a Railway Colony

I want to know what data should be taken while designing a septic tank for a small colony. As I am a civil engineer in railways and I have to maintain and construct so many septic tanks for 50 to 400 users. I am confused a lot as there is so many differences in different books. Please help me to ascertain the following data,

1. Quantity of sewage per capita per day

2. Quantity of solid waste "       "        "

3. Space for digested matter

Generally we clean tanks once in 2 years

Also, I will be happy to know the standard system of calculation to design water supply system of a colony of 2000 persons. Source of water is deep tube well and a stand by pump exists.


Vipin Kumar Tyagi




Dear VK Tyagi,

You would find more details at IWP- website on what learned- members have been suggesting who desire to learn about WWT.

Our Ngo has been following a concept named DEWATS propagated by CDD-Bangalore, contact details Mr.Joe D’Souza < > and trainings on this and other wwt concepts are imparted at CSE,Delhi, contact details Mr. RKSrinivasan <>

This domestic STP concept processes WW and makes it fit for discharge into urban-sewers and or into wet-lands. Also the ww thus remedied can be taken for reuse or if desired into soak-pits for conveyance to ground aquifers. The concept is very adaptable even in conditions when you find ground-water levels very high Etc.

Now coming to your query and you desire data for 2000 users ( pl do look up IWP answers and you would find a lot of background data) considering a standard supply made available 130 lits per day per person, this amounts to 260 Kl per day, with 10% extra is @ 300kl pd.

In this case if you opt for DEWATS type of treatment and take up the water for re-use and excess for soakage thru soak-pits. The system can be thus designed.

Pl be guided by the above and you set a novel guideline in Railways to conserve water and re-use and also recover slurry etc. duly co-composted with other complex bio-wastes as manure.

Pl feel free to be in touch and we can furnish specific information on the above.

With well wishes from VigyanVijay,

Er. Ajit Seshadri
The Vigyan Vijay Foundation.

Er. Ajit Seshadri,Head- Environment, The Vigyan Vijay Foundation


Dear Mr. Tyagi,

It is true there are many norms for designing septic tank.

You may please refer Indian Practical Civil Engineering Handbook by P. N. Khanna.

Simple design parameters for calculations are as given below.

Details Small tankt Big tank Type of waste
Capacity per person, cum 0.084 to 0.112 0.07 Sewage + Sullage
Capacity per person, cum 0.042 0.042 Sewage (WC water)

Additional volume shall be provided for sludge storage on the basis of o.05 cum/capita.

Retention time shall be 24 to 48 hr. Anaaerobic upflow filter may be provided
for further treatment.

Please contact us if you need any further information.

Prof. R. V. Saraf
Viraj Envirozing India Pvt. Ltd.
21 Radhakrishna, Near SBI Maid Road, Pune 38

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