The season of monsoon always brings a relief as it reduces the water scarcity problems and brings down the temperature. However, lately there’s a big reason to worry as the ‘City of Seven Islands’, Mumbai, received the second highest rainfall in just 24 hours since 44 years and a severe flooding situation was witnessed on July 2. The waterlogging problems caused by the heavy rains added in creating critical
situations across the city.
It is, therefore, necessary to adopt a strategy in dealing with the forthcoming monsoons & look at a long-term solution to deal with the waterlogging issues. There is an immense need to devise an integrated plan to address the issues in the existing underground drainage system. A well pre-planned steps or methods are required to avoid such flooding problems in the city governed by the richest civic body, Brihanmumbai Municipal Corporation (BMC), of the country.
There is a high need to plan and implement some of the best architectures & projects to deal with the waterlogging and flood like situations. One of such architectures and projects include ‘Pervious Concrete’ which is seen as the only answer to flooding in India. Pervious Concrete is seen as being an important application for sustainable construction and is one of the low impact development techniques used to protect water and it’s quality.
Appropriate use of specific pervious concrete such as Porous Pavement which could be extremely eco-friendly and affordable surfacing option for low-traffic & low-speed bound roads. It is an acknowledged Best Management Practice issued by the Environmental Protection Agency (EPA) for stormwater. The practice will reduce the water pollution problem as well as help pump rain water to earth rather than wasting it by supplying it to the ocean. This has become a necessity for the Mumbai city which goes through flooding during monsoon and cut in the water supply during hot summer every year.
The Pervious Concrete consists of cement, coarse aggregate and water with little to no fine aggregates that possess high porosity used for concrete flatwork applications such as in some specific areas in the locality maybe used for constructing pavements, parking areas, lawns, road sides, etc. It prevents water from precipitation and other sources to pass directly through, thereby reducing the runoff from a site and allowing groundwater to recharge.
In the case of floods, Pervious concrete decreases the overflow/waterlogging of rainwater from/at the paved areas. This also makes the civic body reduce the onerous job of maintaining ponds for stormwater retention as it conserves the stormwater, leaving no requirement for additional land to install large ponds and other filtering systems to retain stormwater. After installing pavements of the same, there is no need of installing drains and underground piping. It is, therefore, important to devise such technique in Mumbai to prevent the city face water scarcity during summer and floods during monsoon.
The pavements made from this Pervious concrete allow transfer of air and water to the roots of the trees that help trees to flourish. The open-cell structure of this concrete pavement allows the temperature of the earth to remain cool. Pervious Concrete significantly reduces these risks by allowing the water to permeate the earth. With pervious materials, the runoff can be absorbed into the soil, constituting a natural cleaning process in its journey to replenish the groundwater supply.
One of the reasons behind the tragic situations like floods is the land which has lost its absorbance capacity which may be because of deforestation of land and plucking out the greenary day by day.
The devising of Pervious Concrete is just a minor step which would deliver results in controlling waterlogging and floods. There is no time to think only about major steps that would deliver major results, but to start with every possible step and solutions that will lead to reducing the chances of such crisis. Therefore, we need the land that can absorb and suck water into it.
We need to see if Shiv Sena ruled BMC will be able to take such bold decision to keep Mumbai away from waterlogging situations. This will not only be beneficial to Mumbai but open the door for the other state to adopt this technology and curb flood like situations.