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JAPAN INTERNATIONAL COOPERATION AGENCY COOPERATION INTERNATIONAL JAPAN 012 km 012 in the Democratic Socialist Republic of Sri Lanka Isolation Bund 0 The Study onStorm Water Drainage Plan for the Colombo Metropolitan Region Scale Wattala Bund Wattala Gate Kalu Oya Basin Peliyagoda Pumping Station North Lock Gate A8 -F8 Downstream inKelaniGanga Facilities FloodControl Major Figure 2.1.1 Kelani North Bund Kelani Ganga Basin Kelani Flood Plain (Unprotected Area) Railway Embankment (Bund Constructed by GCFC&EIP Phase-I) Gotatuwa Bund Greater Colombo Basin New Mutwal Tunnel 0 Northward Mutwal Tunnel Drainage System Main Drain St. Sebastian North Canal St. Sebastian East Canal St. Sebastian Kelani Ganga South Canal Dematagoda Ela Kolonnawa Beira Lake Ela Mahawatta Gotatuwa Ela Pumping Station P Torrington Kolonnawa North Canal Ela North Torrington Kolonnawa South Canal Ela South Madiwela East Diversion Canal Welawatta Heen Ela Canal Parliament Kotte Ela North Lake Kotte Ela South Dehiwala Kirillapone Canal Canal Madiwela Catchment Bolgoda Canal Westward Drainage System Madiwela South Diversion Canal Legend Weras Ganga Basin Boundary Drainage System Boundary Channel Improvement Construction of Tunnel / Diversion Channel Scale 0 1 2 km Retention Areas The Study on Storm Water Drainage Plan Figure 2.1.2 for the Colombo Metropolitan Region Proposed New Capital City Drainage in the Democratic Socialist Republic of Sri Lanka JAPAN INTERNATIONAL COOPERATION AGENCY Project A8 - F9 0 St. Sebastian North Canal St. Sebastian East Canal Main Drain Kelani Ganga St. Sebastian Northern South Canal System Dematagoda Ela Kolonnawa Beira Lake Ela Mahawatta Ela Torrington Kolonnawa North Canal Ela North Torrington Kolonnawa South Canal Ela South Western Heen Ela Madiwela East System Diversion Canal Welawatta Canal Kotte Ela North Parliament Lake Kotte Ela South Dehiwala Kirillapone Canal Canal Southern System Eastern System Bolgoda Canal Weras Ganga Legend Scale Basin Boundary 0 1 2 km Canal System Boundary Canals Improved by GCFC&EIP Phase-I Other Canals Inland Marsh Lands (identified in 1:50,000 scale topographic map) The Study on Storm Water Drainage Plan Figure 2.1.3 for the Colombo Metropolitan Region Main Canals Improved by GCFC&EIP in the Democratic Socialist Republic of Sri Lanka JAPAN INTERNATIONAL COOPERATION AGENCY Phase I A8 - F10 0 St. Sebastian-2 Scheme Dematagoda Scheme Surpentine Scheme Unity Place Scheme Torrington North Scheme Kawdana Scheme Attidiya Scheme Legend Major Canals Improved by GCFC&EIP Phase-1 Other Canals CMC 19 Schemes Urban Drainage Schemes Studied Lunawa Lake Urban Drainage Schemes Completed North Scheme (GCFC&EIP Phase-II) Colombo South 5 Schemes Urban Drainage Schemes Studied Urban Drainage Schemes Implemented (GCFC&EIP Phase-III) Lunawa Lake South Scheme Urban Drainage Schemes to be Implemented Scale Nugegoda Town Area Scheme Studied 0 1 2 3 4 km Kotte and Kolonnawa Schemes Studied The Study on Storm Water Drainage Plan Figure 2.1.4 for the Colombo Metropolitan Region Existing and Planned Storm Water Drainage in the Democratic Socialist Republic of Sri Lanka JAPAN INTERNATIONAL COOPERATION AGENCY Schemes in Greater Colombo Area A8 - F11.

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