ABSTRACT
In almost all of India’s cities, developments in the water supply sector have outpaced those in the drainage sector. While the new areas have been receiving increased water supply through pipelines or tankers, these localities do not have adequate sewer systems and it is a common sight in most cities to see raw sewage flowing into the open storm drains. Consequently, these drains lack the necessary capacity to convey the storm water flow during the monsoons
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and drainage managers are faced with the task of managing the overflowing stormwater combined with wastewater from the highly populated areas for which the existing drains are totally inadequate. Ad hoc measures, such as installing additional pumps to pump out water from the low-lying areas, are quite expensive in the short term and often ineffective, since the power supply is not dependable, particularly during heavy rainfall when power lines are sometimes dislodged. Apart from the poor drainage system, the other major reason for water accumulating is the rising level of roads.
