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1. Dear Mr Bain1. For rainfall

Dear Mr Bain

1. For rainfall data approach the local division of India Meteorological department, Hyderabad (checkhttp://www.imdhyderabad.gov.in/). They can provide you short duration rainfall data, but 6 min is too optimistic, mostly you will get at 15 mins interval, or hourly data

At present there is no separate guideline for urban drainage design in India. The sewerage manual published by Central Public Health Engineering and Environmental Organisation, devotes a few sections on storm drainage design. This manual does not specify any standard for pollutant reduction in stormwater. Also there is no design guidleine for offline or online stormwater flow attenuation system. You can also have a look at the very recently published http://ndma.gov.in/ndma/guidelines/Management_Urban_Flooding.pdf

You may also get in touch with Professor Kapil Gupta of Indian Institute of Technology, Mumbai . He is a Member, Expert Committee for drafting Manual on Urban Drainage, Ministry of Urban Development, Government of India and can advise you regarding modelling. He has a vast experience of stormwater modelling in the Indian Scenario.   

2. For detailed design standards like storm frequency to be adopted, derivation of the IDF curves, estimation of run-off etc. you can refer to the CPHEEO manual (only 18 year old) mentioned above. You can also have a look at IRC SP 50 and SP 42.

We used the MOUSE modeling software (in combination with MIKE 1) by DHI for verification the detailed design of the stormwater draiange system in Kolkata in Eastern India (a city much bigger than Hyderabad), a few years back. However, this was mainly for verification of whatever we designed using typical spreadhseets. Indian municipalities generally do not believe in stormwater modelling much. Hope you get a logical client :)

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