Floods

Increase in urbanization leading to climate changes and human activities have resulted in Flash flood scenarios and High intensity rainfalls in the city. Recent calamitous floods have spawn way for many Flood management projects aimed at development of stronger flood monitoring and smarter flood protection systems.

One such sincere attempt has been made at KSNDMC where flood issues can be better managed by better monitoring and measuring and applying scientific methods to manage the Disaster.

Bengaluru

  • Bengaluru is located in the south east region of Karnataka. It is almost equidistant from both the eastern and western coasts of the South Indian peninsula. It has 12.591North latitude & 77.571East longitude. It has an altitude 920m above sea level .The mean annual rainfall is about 900 mm with about 60 rainy days a year. It is located 100 km from the Kaveri River.
  • The Bangalore Corporation is called the BBMP ( Bruhat Benagaluru Mahanagara Palika). The BBMP is divided in 8 zones i.e. North, East, and West, South, Bommanahalli, Mahadevpura, Rajarajeshwari Negara and Dasarahalli zone.

Bengaluru Storm Water Scenario

  • The city’s topography is characterized by a series of well defined valleys which radiate from a ridge at a location called high ground to the north of the city and fall gradually in all directions. The three zones in core area are further demarcated by natural topography into four major watershed catchment area namely Vrishabhavathy valley catchment, Koramangala valley catchment, Challghatta valley and Hebbal valley catchment .Three of the valleys Vrishbhavathy valley, Koramangala valley and Vrishabhavathy valley, run in north to south direction and divide the greater part of the area which lies to the south of the ridge into three separate and distinct drainage zones. A fourth major valley, referred to as the Hebbal valley forms the drainage zone of the north of the ridge and runs in the northern direction.
  • All of these valleys have enclosed ponds or lakes at the perimeter of the Bangalore region. The majority of the city‘s storm water is drained to these ponds or lakes. The city has 840km length of drainage network. The Drainage system has box type trench on either side of the road, these drains further connect to the secondary drains and then to the open channel drains lined with concrete retaining walls.