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Managing Flooding in Thiruvananthapuram City
- 1. ABC
- 2. THE CITY OF THIRUVANANTHAPURAM 2 Largest Corporation in the state by area and population. Thiruvananthapuram Corporation covers an area of 214.86 sq.km and has 100 administrative wards with a population of 9,57,730 as per the 2011 census. It has relatively high humid climate and an average annual rainfall of 2197 mm (as per IMD data). The district gets both southwest monsoon and north east monsoon. The percolation of storm water into the ground takes place slowly due to the soil characteristics and it leads to waterlogs and flooding in the area.
- 3. 3 DRAINAGE NETWORK OF THIRUVANANTHAPURAM Ulloor Thodu Pattom Thodu Pazhavangadi Thodu Aamayizhanchan Thodu Thekkanakkara canal Thettiyar thodu
- 4. OTHER MAJOR WATER BODIES IN THE CITY 4 Name of drain Length Width Originates at Passes through Ends at Ulloor thodu 8.67 km 15-20 m Keraladith yapuram Ulloor, Chalakuzhi, Murinjapalam, Gowreeshapattom, Puthenpalam and Kannamoola. Amayizhanjan thodu Pattom thodu 5.80 km 9-12m Mukkola Vayalikkada, Pattom, Thekkinmoodu, Kambipalam Converges with Ulloor thodu and ends at Amayizhanjan thodu Pazhavangadi thodu 5.89km 3-7 m Near Jimmy George stadium Chenkalchoola colony, Thampanoor, Trivandrum railway station, East fort, Pazhavangadi temple, Thakaraparambu, Uppilaamoodu, Pattoor to Kannamoola Converges with Ulloor thodu and Pattom thodu at Kannamoola and flows downstream as Amayizhanjan thodu
- 5. OTHER MAJOR WATER BODIES IN THE CITY 5 Name of drain Length Width Originates at Passes through Ends at Amayizhanjan thodu 5.4 km 30m Confluence point of Ulloor and Pattom thodu Kannamoola , Idathara , Anayara , Akkulam Legislative assembly thodu also confluences with Amayizhanjan thodu and ends at Veli lake Thekkenekara canal 2.56 km Covere d portion- 2.5m Open portion– 5m Karimadom tank East Fort, Padamanabhaswamy temple, Sreevaraham, Muttathara,NH bye pass Parvathyputhanar Thettiyar thodu 5.00 km 4 to 10m 3 branches start from Madavoorpara Guhakshethram , Green field stadium, Anthiyoor bridge respectively. The three branches join together at Moonattumukku and ends at Veli Kayal
- 6. REASONS FOR FLOODING 6 1. The choking of the drainage system due to the deposit of garbage, plastic and silt 2. Reverse flow in drains/thodu due to the high flood water level in the rivers. 3. The heavy spell of rains in a very short time causes flash floods in the city. 4. Many of the river banks are encroached and converted to built up areas 5. The piers of various bridges inside the drainage system blocks free flow of flood water 6. The 2 rivers in the city are drained through 2 estuaries viz. Veli and Poonthura into Arabian Sea. During the high tide the estuaries remain closed which aggravates the situation. 7. The low water holding capacity of Akkulam Lake is also a major cause of flooding in the city.