Urban flood management - Indian approach

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Urban flood management is getting important today after the divesting flood of Mumbai on 2005. Still the approach to flooding is as a disturber ;creating damage to the life and property. his approach has to change. We must realize that rain is the only recurring source of water. So the water has to be conserved while solving the disastrous action of flood. Thus we need a strategy of water management to counter the cyclic climatic condition.

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13 Answers

  1. Storm water drainage is very simple and very complicated. If we allow water to freely flow in the natural drainage channels, there is principally no problem. But increasing population put pressure on land use and the land belonging to natural drainage channels is used for construction activities for residential and commercial purposes. The greediness of influential people of the society may be politicians, industrialist, corrupt government officials, criminals, etc. In Rajasthan, Rajasthan government has issued directions that all allotments made in the catchment area of water bodies in the Rajasthan state after enacting of Rajasthan Tenancy Act, 1955 in year 1955, shall be cancelled and constructions in such places be demolished. The directions were issued implementing the orders of the high court. The details are available at https://docs.google.com/document/d/1qudykzJmfDqP79urUw20ZwKFeKiRFVwhO93w1RLjuJU/edit Further details can be obtained from me via e-mail yagrawal@bsnl.in . The Rajasthan Govt has started the implementation of its orders and slowly removing the encroachments. If the other states of India and world as a whole, take such stern action, I am sure so many problems related to urban flood management can be solved easily.

  2. The main problem of flooding in the urban areas and metro cities like Mumbai Delhi is that the land of natural drainage channels have been used for constructing buildings for commercial and residential purpose. When storm water does not find proper way, it spreads and takes the whole city into its grip. Till the natural drainage channels are cleared , a permanent solution is not possible.

  3. Rain water can be controlled by reducing its quantum at the site itself. Drains become insufficient during heavy rains due to clogging or less capacity or various other administrative/technical reasons. We can reduce the quantum of downpour water in decentralized manner by following ways: 1. Lay CC tiles, open jointed & 1.5" Dia hole at centre, on Porous PCC and sand bed at the places where rain water accumulates. 2. Bed of the drainage network should be made with porous PCC. 3. At selected places Rain water Recharge Structure may be made. 4. Abandoned tube wells, bore wells, open wells can be used for recharge and to reduce the accumulated rain water. It is certainaly not possible to carry/transport every thing whether it is rain water. We should try to get the solution at local level.

  4. the waste waters purified by the process “Biological Pit “lyseconcept rejects a water fertilizing and enriching for the topsoil. dispersed this water supports the development of biodiveristé of surface. but as it contains fine organic matter particles in suspension it changes the nature of the ground. two examples: on a clay soil a 5 m thickness of depth the red ground clay became slightly gray on the surface. while digging slightly one sees the change of the ground. a sandy ground (sand of sea which for a long time does not have any more any salinity) became a topsoil. the two examples are different origins. one is made by the process “Biological Pit " lyseconcept, the other is done by the market-gardener who uses a special method of fertilization of his soil. In both cases I approached problematic “the flood” and in both cases it was tell to me that water disappeared more quickly on the clay soil and that at the time of the strong rains flooding in the other case its soil was maintained. I believe it because the vegetable biodiversity by purifying the ground penetrates that Ci with its roots and supports the infiltration of rainwater. it is logical. more one supports the vegetable biodiversity more one will dig the ground and water will infiltrate more quickly. in urban area these are trees that it is necessary to plant.

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  5. it is it or the solution of the biological assainissemet has its place. to revalorize waste waters for a productive organic farming with extension towards the vegetable biodiversity of approval. one can study plantations which by range romperaient the invasion of sea water. in against part one removes the pollution of waste waters by overflows

  7. hello I think that the solution is the vegetation. the more luxuriant it is more it consumes water and more its roots infiltrate in the ground this last being used as drainage of rain waters. Qaund the flood is done it is already too late. on the other hand with vegetation part of rainwater will leave already in infiltration in the ground thanks to the roots. who more is one fights the désertifiction of the cities. the CEBRE centers Purification of Waste waters and of Ecological Recycling sets up the compartmental cleansing of waste waters more responsible but so productive for the vegetable biodiversity. that Ci by the principle of the photo synthesis will reset the atmosphere of the cities by absorbing the C02 carbonic gas and by rejecting oxygen 02.

  9. As the topic is very much crucial and as per my view the most effective method to counteract the urban flood by effective solid waste management and system structure have to adopt in such a manner to keep the vigilance in each area of municipalities zone . Also stringent laws have to make while issuing the approval of plans of new colonies ,commercial markets,shopping areas ,roadside vendors and societies etc ,so to bring down the nuisances of solid waste and create the awareness among the slumareas,schools and colleges . It just the core factor which is more responsible in urban flood.

  10. The causes of urban flooding can be categorized into site specific reasons and general reasons. All cities are facing the drainage problem due to insufficient capacity of canals, enchantments, dumping of waste, proximity to sea etc. So a policy, a strategy and a definite plan can reduce the flood risk. When we think of solutions, we must think of, how to reduce the damage rather than arresting the flood.

  12. Bangalore city also faces floods in every rainy season and leads to loss of life and propoerty, for the time being or even before monsson the concened authority of govt. spends huge amounts on removing debris/silt, clearing the clogged drains etc. Effective and efficient Flood management of the city may save the life/property.

  13. Agree. There is a need for softer research on the topic to assist hard infrastructure research that estimates the economic and social impact of such events to convince policy makers that it makes economic sense to have good water management strategy. I think if an analysis of direct and indirect economic and social cost of flood is done it will be far larger than the cost of preventive infrastructure.