hiring of support services for hydrological observations on outsourcing basis at various rivers under tapi division , cwc , surat ( gujarat ) , hiring of support services for hydrological observations on outsourcing basis at various rivers under tapi division , cwc , surat ( gujarat ) , gauge site ( 08 nos . ) :- monsoon ( june -oct ) 5 months monthly ( 30 days ) , gauge site ( 08 nos . ) :-non monsoon ( nov . -may ) 7 months monthly ( 30 days ) for 3 hours work , g&d sites ( 12 nos . ) :-monsoon and non monsoon ( throughout year ) 12 months monthly ( 26 days ) rate for 4 hours work , g&d sites ( 12 nos . ) :-monsoon ( june -oct ) 12 sites 5 months monthly ( 30 days ) , g&d sites ( 12 nos . ) :-non monsoon ( nov . -may ) 12 sites 7 months monthly ( 30 days ) for 3 hours work