0 a Basin g elani Gan K a Basin y alu O K (Bund Constructed by GCFC&EIP Phase-I) Greater Basin Kelani North Bund Kelani Flood Plain (Unprotected Area) Gotatuwa Bund Isolation Bund Railway Embankment Bund Wattala Gate Pumping Station

Scale North Lock Gate 012 km

The Study on Storm Water Drainage Plan Figure 2.1.1 for the Colombo Metropolitan Region Major Flood Control Facilities in Kelani Ganga in the Democratic Socialist Republic of JAPAN INTERNATIONAL COOPERATION AGENCY Downstream

A8 - F8 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 Ela

Kolonnawa Ela Mahawatta Gotatuwa Ela Pumping Station P

Torrington 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 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 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 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