Figure 1.1.5 Boralesgamuwa South Sub-Basin A7
Total Page:16
File Type:pdf, Size:1020Kb
N Old Kesbewa Road High Level Road Boralesgamuwa Wewa Rattanapitiya Ela Maharagama-Dehiwala Road Weras Ganga Colombo-Piliyandala Road Maha Ela Legend Scale 0 200 400 600 800 m Boundary of Sub-basin Principal Drainage Channel Urban Drainage Channel The Study on Storm Water Drainage Plan Figure 1.1.5 for the Colombo Metropolitan Region Boralesgamuwa South Sub-basin in the Democratic Socialist Republic of Sri Lanka JAPAN INTERNATIONAL COOPERATION AGENCY A7 - F5 JAPAN INTERNATIONALCOOPERATION AGENCY in the Democratic Socialist Republic of Sri Lanka N The Study on Storm Water Drainage Plan Drainage Water onStorm Study The for the Colombo Metropolitan Region Metropolitan Colombo the for High Level Road Colombo-Piliyandala Road Maha Ela A7 -F6 Maha ElaSub-basin Figure 1.1.6 Legend Boundary of Sub-basin Principal Drainage Channel Weras Ganga Small Stream or Irrigation Creek Moratuwa-Piliyandala Road Scale 0 400 800 1200 1600 2000 m Kospalana Bridge N Ratmalana Airport Borupana Bridge Kandawala Telawala Weras Ganga Legend Boundary of Sub-basin Kospalana Katubedda Bridge Minor Tributaries Scale 0 200 400 600 800 m The Study on Storm Water Drainage Plan Figure 1.1.7 for the Colombo Metropolitan Region Ratmalana-Moratuwa Sub-basin in the Democratic Socialist Republic of Sri Lanka JAPAN INTERNATIONAL COOPERATION AGENCY A7 - F7 N Colombo-Piliyandala Road Borupana Bridge Maha Ela Weras Ganga Moratuwa-Piliyandala Road Kospalana Bridge Legend Scale Boundary of Sub-basin 0 200 400 600 800 m Minor Tributary or Creek The Study on Storm Water Drainage Plan Figure 1.1.8 for the Colombo Metropolitan Region Thumbowila Sub-basin in the Democratic Socialist Republic of Sri Lanka JAPAN INTERNATIONAL COOPERATION AGENCY A7 - F8 N Dehiwala Canal Dehiwala Zoo Galle Kawdana Scheme Hill Street (1.6 km2) K4 K2 Bolgoda Canal Rattanapitiya Ela K1 K2 Bellanwila-Attidiya Marsh Attidiya Road Attidiya A6 A2 A4 A3 A5 A7 Weras Ganga A1 Colombo Airport Attidiya Scheme (2.7 km2) Legend Boundary of Sub-basin Principal Drainage Channel GCFC&EIP Phase III Scale Drainage Area 0 200 400 600 800 m Urban Drainage Canal / Conduit to be Improved The Study on Storm Water Drainage Plan Figure 1.9.1 for the Colombo Metropolitan Region General Plan of GCFC&EIP Phase III in the Democratic Socialist Republic of Sri Lanka JAPAN INTERNATIONAL COOPERATION AGENCY A7 - F9 N Bellanwila-Attidiya Marsh Bolgoda Canal Weras Ganga Swamp Channel Width: 100 to 500 m Channel Depth: 1.5 m Riverbed Level: -1.0 m Ratmalana Airport Natural Stream Channel Width : 60 to 160 m Borupana Bridge Channel Depth: 1 to 1.5 m Opening Width 30m x 2-span Riverbed Level: -1.2 to -0.9 m Maha Ela Natural Stream Channel Width: 160 to 600 m Ratmalana-Borupana Road Channel Depth: 1.5 to 2 m Riverbed Level: -1.5 to -0.6 m Natural Stream Channel Width: 40 to 160 m Channel Depth: 2 m Riverbed Level: -1.5 to -1.3 m Moratuwa-Piliyandala Road Moratuwa University Scale Kospalana Bridge 0 200 400 600 800 m Opening Width 12m x 3-span The Study on Storm Water Drainage Plan Figure 2.2.1 for the Colombo Metropolitan Region Present Condition of Weras Ganga in the Democratic Socialist Republic of Sri Lanka JAPAN INTERNATIONAL COOPERATION AGENCY A7 - F10 JAPAN INTERNATIONAL COOPERATION AGENCY in the Democratic Socialist Republic of Sri Lanka Sri of Republic Socialist Democratic the in The Study Water onStorm Drainage Plan for the ColomboMetropolitan Region Weras Ganga 5 Left Bank Right Bank 4 Bed Katubedda Tributary Kospalana Bridge Maha Ela Confluence Borupana Bridge Confluence 3 2 A7 - F11 Longitudinal Profile of Ganga Weras Figure 2.2.2 1 Elevation (above MSL) (above Elevation 0 -1 -2 North Bolgoda Lake Weras Ganga -3 0 500 1000 1500 2000 2500 3000 3500 4000 4500 Distance (m).