This is not seen in earlier years. Only in the last 3-4 years, such incidents are happening. Encroachment of stormwater drains (natural and artificial), laying of roads without leaving open soil for seepage of water, not cleaning the drains before rainy season, etc are some of the reasons for floods on the roads.
Huge apartment complexes are coming in the cities thereby restricting the free flow of rain water. Drainage canals/channels are occupied with hutments leaving little space for the water to flow. When roads are relaid, I read few years ago, that the surface of the existing road should be removed and new road should be laid so that the water on the road can easily seep in to the ground. Though I do not know the principle, may be relaying over and over on the same road may reduce the porosity of the road and thus water will not seep.
Further, of late, instead of bitumen roads, concrete roads are being laid for long life, with good intention. However, concrete roads are not allowing the water to sink into the soil. And concrete roads laid edge to edge in the streets without allowance for rain water to flow in the edges on the soil. Business establishments, residential buildings are also constructed with concrete surface upto the roads. Gardens are not maintained in the housing complexes. Parks are disappearing and thus no open areas are left. Trees are cut and the area is used for constructing some more rooms to get income. All this is leading to total concrete carpeting of cities and towns with narrowed storm water drains.
I feel the above are reasons for flooding of roads even with normal rains. The capacity of the underground stormwater drains got reduced because of choking / use of stormwater drain for normal sewage drain. With ever increasing population, these drains are becoming insufficient. When it rains, persons staying near the roads are removing manhole covers thinking that flood water will go into the drains through open manholes. But due to insufficient capacity, drains are full and water stays on the road. Commuters on the road, not knowing about open drains, are falling into these drains and precious lives are lost.
What can be done?
- Floor space index (FSI) should be brought down
- The capacity of drainage system should be in line with the population and industries
- A parameter like open garden area with open (earth) area should be made conditional for all buildings while giving permission
- Either side of the roads should be left open without laying bitumen/concrete
- Summer months should be declared as months of dechoking of drains
- All establishments which do not have parking space and making their customers to park in the roads should be asked to create parking space or to shift to some other location where they can have their own parking so that roads are not encroached
- It is common to see at the entrance of many apartment complexes mentioning that VISITORS VEHICLES ARE NOT ALLOWED INSIDE. Such practice should not be allowed. All residential buildings also should have sufficient parking space within their complex for visitors. Otherwise, they can have multilevel parking instead of grumbling that they do not have sufficient space.
- Though it is not possible in already developed areas, sufficient water catchment areas / lakes should be part of city plan where expansion is taking place so that water can be held instead of allowing to flow like flood and this will also help to meet water needs of the city. Every city should be a LAKE CITY so that floods can be restricted and water need are met.
