Wednesday, May 13, 2015

Drainage Plans

In the weekly meeting held yesterday, I laid emphasis on cleaning all drains to ensure that no water-logging took place during monsoon. Street 64, Jatragachi, Chinar Park and other places need an annual cleaning. I advised NKDA and PHE engineers to form teams to take preventive action. I also advised interaction with Metro authorities so that drainage system is not blocked by their steel panels and piles.
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Here is a photo for our campaign for Eco Island Cottages:



  1. Dear Mr Sen,

    Nice to find that drainage/canal cleaning is on regular yearly plan now.

    At the same time, I wish to draw your attention on the process of cleaning. At the moment cleaning of Bagjola canal is being done along Jatragachi, the process being followed appears to be adhoc. The cleaning shaft deposits the silt on adjoining roads which not only blocks the roads but also makes it very unhygienic.
    The process could be more planned and structured by industrializing it so that silts are not deposited at the banks and not risking the lives of people residing near canal bank roads.

    Further on the same stretch, the water pump maintenance has dug the road and no fencing has been done to prevent that area from unforeseen accidents. With monsoon nearing, unless the job is completed and properly closed, it’s only going to aggravate the already precarious situation of commute around it.

    Kindly look into it and help people residing around Jatragachi-Gauranganagar.


  2. Sir,
    Cottages looks excellent. It seems booking can be done by phone number and during "office hours" (which may be 6 hours on weekdays). Booking of cotteges should be via internet and tie-up with major travel sites should be done to book these cotteges as well as advertise them.
    Optionally the maintenance should be done by private & reputed company on a yearly contract.

  3. NKDA is a flat land like Kolkata. It also rains a lot with high rainfall intensity during monsoon. Therefore design manuals customised for such region prescribes 2 months rainfall intensity graphs for surface water drain design. It means that the drainage system is designed to get flooded every 2 months a year. This is done to optimise the capital cost of drainage system vis-a-vis functional requirements.
    This is not a new design practice, It was codified in the early 60's for Kolkata & mumbai by a World Bank funded american team.
    The national design codes also prescribes minimum dimension for sewer line pipes and surface water drains. The minimum sections prescribed by code also leads to silting of surface water drains during dry season due to lack of self cleaning velocity of water. Thus when it floods during rainy season, the silt prevents drainage within hours and causes water logging. Water logging damages the flexible pavements (the non concrete roads) as they have been built over compacted silty clay sub-base in NKDA.
    Till the early 60's streets of kolkata were washed by CMC sweepers using raw waters from Ganges. You still find the hose pipe standposts in old part of Kolkata supplying raw water from Ganges. This action used to keep the surface water drains of Kolkata silt free during dry season so that after monsoon floods, the water is drained out within hours. Similar system for NKDA can be easily adopted with SYSTEMIC RETROFITS.
    I remember that the final formation level of developed land used to define the water shed for all the water bodies designed within NKDA. This was done to convey the storm waters within the watershed to the manmade water bodies. In the case of NKDA I would suggest use of raw water from these water bodies for cleaning the roads of its watershed during dry season. The washed water de-silts the drains and carries it back to water body.
    NKDA is lucky to have less than 90 Dry days a year. I have observed that we hardly got 100 working days a year to get earth from desilted Bheries and perform earth work in compaction between 1999 - 2003, causing delay in project development.
    Therefore even if we use the man-made water bodies to get raw water for street washing, the water bodies wont dry up, there will be water throughout the year

  4. Dear sir,
    It is good to see lot of positive development is going on New town. Kudos for that.. Peoples also enjoying this developments. Specially I want to mention about eco-park. Many of us already visited that place and was a great experience.
    But, I want to draw your attention regarding few points about eco park. In Original Plan of the eco-park there was 3 eco zone apart from theme area, active zone and lake part. Each of these eco-zone are planned to be consists of few water body and surrounding with Plants, trees and grassland. A perfect example of urban jungle and truly ecological vibrant area. But it is sad till date none of these projects had started. I urge, please do necessary steps so that
    we get a proper eco area in our city.


  5. Please take some stern action against construction sites that randomly dump construction materials like bricks, stone chips, sand etc. on the road side. I believe debris from these stuff enter and contribute to clogging the drains too. Also, public awareness needs to be raised that storm drains are not garbage bins. The roadside stalls cause a lot of garbage to be dumped near the drains - which also possibly lead to clogged drains.

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