bids are invited for custom bid for services - provn of survey of existing drainage system in offrs md accn at dk-i under ge (central) delhi cantt-10.; design and consultancy for hydraulic design for drain lines, complete estimation of project including preparation of drawing for connection of existing systems (if any) and its vetting at appropriate level with following scope of work area approx at 1622 mtrs :- (a) preliminary field data collection. (b) working out the dimension of drains. (c) review of existing drainage system and water disposal system including effluent on every 20 mtrs. (d) preparation of drainage network. (e) l-section of drainage line.