Flood Hazard
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NEGOMBO 80,000 85,000 90,000 95,000 100,000 105,000 Kadawala 110,000 115,000 120,000 20 Adikarimulla Dunagaha 20 225,000 Demanhandiya Disagewatta 20 225,000 Kadawala Divulapitiya 20 Balagalla Kudapaduwa Batepola 20 20 a Henpitagedara Dalupota y 20 O Katuwellegama Mapalangedara Wellaweediya a Kondagammulla iy pit Wewagedara la bu Kinawinna im Kamachchodai (Part) Katiyala K Bomugammana Hunupitiya Maha Hunupitiya Dagonna 20 Hapuwalana Horagasmulla Dunagaha Ela 40 Palugahawela 40 Totillagahawatta 40 Muhandirampitiya Udayartoppuwa Kundanwila 40 Katuwapitiya Alutepola Kadirana North Hanchapola 20 40 Tammita Duwa Angurukanamulla 20 40 40 Kimbulapitiya Pitipana Weediya 40 40 Muddaragama 20 Madittagama Munnakkre 40 Assennawatta 20 40 20 NEGOMBO Mabodale 20 40 Pitipana KATANA Nilpanagoda Vitanamulla Goluwapokuna Horampella North 40 Watinapaha Kurana 20 Andiambalama Medagampitiya Andiambalama Yatiyana 20 20 ,000 Wankepumulla 220 220,000 Essalla Yatagama Boragodawatta Medamulla Horampella South Kurana-Katunayake Kowinna Dewamottawa Paliyatiyana Basiyawatta 20 Kamaragoda Wegowwa Metikotumulla Pillawatta Udugama Unnaruwa Pallewewa Kotagedara Bulugahamulla 20 Kalahapitiya Dewalapola Katunayake North Minuwangoda Ambalangahawatta Mab Maduwa alam Wattegedara Oya Kalawana 20 Wadumulla Ewariwatta Walanagoda Wadumulla Eluwapitiya Hiripitiya Talahena Katunayake South 20 Galoluwa 20 Meegaspitiya Wapitamulla Pamunuwa 20 20 Mutuwadiya Gamangedara MINUWANGODA Halgastota 20 Negombo Lagoon Helakanda Arambe Kalahugoda Burullapitiya Matammana Wettewa Galoluwa Madawala Ellangala Gallegedara Polwatta Balabowa Wataddara Tempola Madawala Heenatiyana Kuswala Makalanda 40 Weliya Wellikada Amandoluwa Hendiyamahara Marapola Goigama 40 Madangastuduwa 40 Kotakupe Pattaduwana Dungalpitiya Liyanagemulla 40 Pattigoda 20 Yagodamulla 40 Korase 40 Wigoda Heendeniya Welhena 40 Raddolugama(Udagama) Widiyawatta Ganepola Ihala Udugampola Petiyagoda Dandugan Oya 40 ,000 40 215 215,000 40 40 Magalegoda Epambula 5 Dadagamuwa 40 Nekettagalla Seeduwa Halgamppitiya Pahala Udugampola Nedagamuwa Doranagoda Settappaduwa Bandarawatta Kehelbaddara Uggalboda 20 Lauwella 40 Kandoluwawa Pidipola 40 Mukalangamuwa 40 Kotugoda 40 Kalu Oya Bemmulla 40 20 20 Raniswala Kotugoda Kamburugoda Lokilangamuwa 40 Kepungoda Sioyambalapitiya Kebellegodawela Dambadure Dombawala 40 20 20 Mudagaamuwa Alawatupitiya Mahawatta Colony Hagampitiya Ambalanmulla Batapola Watumulla Batepola Udammita Maduruwita Madelgamuwa Walpola Kaluwalgoda Hiriwalmulla 10 20 Boraliyawatta Ekala Kurunduwatta 20 Tittalapitigoda Kindigoda Daraluwa 20 Asgiriwalpola 20 20 Akkaradahaya 60 40 Pitiyegedara Mahipalagoda INDIAN OCEAN Megoda Bolanda 20 Kudahakapola North Balangoda Mabima 20 Kitawala Megoda Tammita Tammita Bogamuwa NEGOMBO Morupola Medawatugoda Elenegoda Mahawita Gallawatta Pentenigoda Karanayakemulla Egodagoda Gampaha Aluthgangoda 20 Makewita Asgiriya Ihalagama Ekala Katugastara Karanayakemulla 20 Arambegodella Mahawatta Kedahakapola South Dandugama 20 Akuraliya Jositawatta Attanagalu Oya Weediyawatta Visakawatta 20 Wellawatta Wahatiyagama(Udagama) Ambanwita Gonagaha Niwandanawatta North Morenna Tudella Kurunduwatta Gampaha Aluthgama Galtotomulla 20 ,000 210 Weliketiya (Part) Welikad Akarawita 210,000 Kirindiwita Kekulangoda Kehelwatugoda Bingpadura Midellawita Delature Yakkaduwa Bendiyamulla Yakkala 20 Kotagedara Gampaha Mahattuwa Walanegoda 20 40 Tudella Kanuwana Pahalagama Tarakuliya Tarakuliya Pattinipitiya Tibbatugoda 40 Ratmalwita Epamulla Indigaslanda Maeliya Niwandama South 20 15 40 Chandanagama Orutota 40 Kuda bollate 20 Nugagasgodella Ja-Ela 20 Kidagammulla Pepol gahadeniya Indiwitiya Ja-Ela Makilangamuwa Henarathgoda Modawalagoda Yagoda Wewalgare 40 Pulluhena Tummodara 20 Sabaragaha 20 20 Bollate North Horagolla Bopitiyaduwa 20 JA-ELA 20 20 GAMPAHA 40 Moragoda Miriswatta Ambahitiya Weligampitiya 20 Mankade Henarathgoda 20 Uruwal Oya Meda 40 40 Ganemulla 20 Wewala 60 Pulluhena South 20 Mottampandura Batagama North Egodawatta Bulugahagoda Kimbulgoda 40 Bollate South Kadawala (Part) Godagedara Kadawala (Part) Mudungoda Itanap[itiya Galahitiyawa North 20 Ganemulla Muturajawela Kinigama Pituwalgoda Rilaulla Pahala Yagoda 20 Ihala Yagoda Kalaeliya Batagama South Galahitiyawa South 20 Belummahara 40 Kunjawatta 20 40 20 Maharagama Paranaambalama Batuwatta West 40 Nugape Hapugoda Hamilton Cannal Walpola 20 40 Pubudugama Batuwatta East 40 Pinwatta Kadana Walpola Kossinna Sivralumulla 40 Ragama North Nedurupitiya 40 Walpola 20 Galoluwa Uruwala ,000 Jayasirigama Udagama 20 205 Amunugoda 205,000 Ihala Imbulgoda Uru wa Uswetakeiyawa Narangodapaluwa Weliweriya West l O ya 20 Aniyakanda Nedungamuwa Dombagahawatta Old Negombo Cannal Peralanda Katuwalamulla 20 40 Nagoda Pahala Imbulgoda 40 20 40 Weliweriya East Pattiyawala 20 40 40 40 40 20 40 40 40 Ragama 40 20 40 40 40 Eatikehelgalla 40 Nawalokagama (Udagama) 4040 Kahatana Welisara 40 40 Kirillawala 40 40 Embaraluwa North Taldiyawatta 40 40 40 40 40 Aluth Akkaraya 40 40 20 Mahabage 20 40 WATTALA 60 Henegama 40 Merawaramulla Weboda North 40 40 20 40 40 Elapitiwela Suriyapaluwa 40 20 40 Mattumagala Nashigama 80 Halanduruwa Horape 40 60 40 Nawanmahara Embaraluwa South Kerawalapitiya Magam,mana 20 40 40 40 Palliyawatta Rammutugala Galudupitiya 40 Weboda South 40 40 Heenkenda 60 80 Kurukulawa Udupila Puwakwetiya 40 40 Tuduwegedara 20 Pahala Karagahamuna Kirikitta 40 Matagoda Gongitota 40 40 60 60 20 kadawata 20 20 Kirimetiagara Gonahena East Naranwala 80 80 120 140 20 Pinnameda 40 20 40 60 20 40 20 20 60 20 20 20 200,000 200,000 mN 80,000 mE 85,000 90,000 95,000 100,000 105,000 110,000 115,000 120,000 Matagoda Pinnagoda Maranwala Dalupitiya Mabole Gonahena East Keragala Puwakwetiya LEGEND Scale 1 : 50,000 FLOOD HAZARD MAP - SHEET 59 MAP BASE Main Road Historical Site 20 10 0 20 40 60 80 100 ATTANAGALU OYA Topographical features shown in the map are those appearing in the Survey Department base map at 1:100,000. Inundation Minor Road areas are prepared by the Hydrological Division of Irrigation Department based on the field surveys. Railway Station MAP INFORMATION Other Roads Kilometre µ EEE Province Boundary METHOD OF PREPARATION LIMITATIONS Railway Origin of the grid system is 200,000 metres South and 200,000 metres West of Pidurutalagala. EEEE Flood Hazard Map depicts the areas that are vulnerable to be inundated by floods in the Attanagalu Oya. Areas of hazard were As stated under the Methods of Preparation, this map was prepared using the areas actually inundated by floods that had LOCATION District Boundary happened. Floods vary greatly in magnitude. Floods of greater magnitude than those surveyed for preparing this map always Bridge / River / Stream / Canal determined based on the areas that were actually inundated by past floods. Inundated areas were surveyed in the field by the D.S.Div. Boundary remain a possibility. Such floods of greater magnitude may cause inundations that may exceed the extents shown in this map. officers of Hydrology Division of Irrigation Department. Areas inundated were determined by several methods: Looking for tell- CENTRAL Flood Hazard Map PROVINCE Balangoda Village Name tale marks left behind after flooding, interviews with the residents of the area and collection of records maintained by local Therefore the inundation areas shown in this map shall not be considered as the only areas subject to flood hazard. Tank/ Lagoon Published by officers were the main methods used. In addition, this map does not indicate the probability of inundation. It includes both the areas with high probability of inundation KANDY NAGODA D.S.Div. Name and the areas with low probability of inundation within the boundary indicated. Irrigation Department, Global Positioning System (GPS) Monitors were used in the survey to find the coordinates of the points on the boundary of 52 53 54 Temple inundated areas. Surveyed points were plotted on topographical maps published by the Survey Department to trace the 10 Bathymetrical Contour / Value with the assistance from Other parameters associated with flooding, such as the depth of inundation, the duration of submergence or the velocities of Kovil inundation boundaries. This plotting was carried out as far as possible in the field to verify the accuracy. Plotting was carried out flood flows are not indicated in this map. These parameters have a bearing on the severity of flooding. Index Contour Disaster Management Centre using 1: 10,000 scale maps where coverage is available: Otherwise 1: 50,000 scale maps were used. æ Church Marks left by inundation may be erased with time. Memories of people also become hazy after a time. Therefore a degree of KEGALLE Sri Lanka By plotting the boundaries of inundation for as many past floods as possible, the envelope of the boundaries of inundated areas 61 uncertainty is unavoidable in the survey of inundation area of a past flood, unless carried out within a reasonably short time of 59 20 Intermediate Contour/ Value was found. Final map was prepared by transferring the prepared envelope to the 1:100,000 maps published by the Survey Mosque May 2012 the event. Irrigation Department would be grateful if any inadvertent mistakes in the map are pointed out. 60 Department. GAMPAHA ^ Police Station Supplimentery Contour DISCLAIMER PURPOSE OF THIS MAP School Flood Inundation Area The Irrigation Department or the Hydrology Division, the Disaster Management Centre and the United Nations Development This flood hazard map is intended for use as a guide in national or strategic level planning and for public information only. It NUWARA G Programme shall not be liable under any circumstances for any direct, indirect, special, incidental or consequential damages Hospital should not be used for local level planning as the resolution is too low. This map and the information presented therein, is not a 66 ELIYA with respect to any claim by any user or any third party on any account of or arising from the use of this map. COLOMBO 67 legal document and should not be used for any regulatory purpose. 68 Cartographical Enhancement by The Survey Department of Sri Lanka.