FLOOD VULNERABILITY ASSESSMENT AND MAPPING OF LAGOS STATE USING GIS TECHNIQUE
BY LASEMA • IN AN EFFORT TO MITIGATE THE DISASTER OF FLOODS IN THE STATE, THE VULNERABILITY AND RISK OF FLOOD IN EVERY PART OF THE STATE HAS BEEN ASSESSED AND MAPPED.
• THE MAPPING IS FUNDAMENTAL TO MITIGATING THE DISASTER AND WOULD HELP THE AGENCY PROVIDE EARLY WARNING, EFFICIENT AND PROMPT PLANNING AND FACILITATE QUICK RESPONSE.
• THIS WAS CARRIED OUT USING INTEGRATED APPROACH OF REMOTELY SENSED DATA AND GEOGRAPHIC INFORMATION SYSTEM. • SRTM DATA- SHUTTLE RADAR TOPOLOGICAL MISSION, A SATELLITE IMAGERY USED FOR THE MAPPING AND ASSESSMENT.
• DATA CAPTURED BY UNITED STATE GEOLOGICAL SURVEY (USGS) RELIEF MAP OF LAGOS STATE 3D RELIEF OF LAGOS STATE ELEVATION POINTS (IN METRES) OF LOCAL GOVERNMENT AREAS IN LAGOS STATE LGAs Highest Point (M) Lowest Point (M) 1 Ifako- Ijaiye 76 3 2 Agege 65 13 The altitude of Lagos state ranges from 3 Alimosho 77 -1 77metres (above the sea level) to 4 Ikeja 68 -4 5 Kosofe 52 -20 25metres (below the sea level) 6 Oshodi 56 -6 7 Mushin 42 -1 8 Shomolu 45 -4 The highest altitude is located in 9 Ikorodu 70 -12 Alimosho LGA, other high altitudes in 10 Epe 66 -8 the state are situated in Ifako/Ijaiye 11 Badagry 37 -6 (76m), Ikorodu (70m), Ikeja (68), and 12 Ojo 32 -7 13 Amuwo-Odofin 40 -7 Agege (65m). 14 Surulere 33 -8 15 Lagos Mainland 33 -20 16 Ajeromi/ Ifelodun 21 -9 The lowest altitude in the state is 17 Lagos Island 52 -25 18 Apapa 31 -12 located in Lagos Island, 25 metres 19 Eti-Osa 35 -13 below the sea level. 20 Ibeju-Lekki 29 -19 FLOOD RISK MAP OF ALIMOSHO, AGEGE, IFAKO/IJAIYE, IKEJA, KOSOFE, OSHODI, MUSHIN, AND SHOMOLU
Ifako/ Ijaiye - Iju.
Ikeja - Ojudu
Alimosho - Ishefun, Akesan
Shomolu - Oworonshoki, Ifako, Bariga
Kosofe - Isheri, Odogun, Ketu, Agboyi.
Oshodi/Isolo – Isolo
Igando Relief Camp located along LASU – Iyana Iba, Igando. FLOOD RISK MAP OF OJO, AMUWO ODOFIN, SURULERE, LAGOS MAINLAND, AJEROMI/IFELODUN AND APAPA
Surulere - Itire, Ikate, Lawanson, Ijeshatedo, Osho, Aganni Ajeromi/ Ifelodun - Coker, Aiyetoro Amuwo-Odofin - Ago-palace, Agboju, Alapako, Kirikiri, Isunba, Igbalogun, Inogbe, Ibasha, Imore, Ilashe, Ibeshe, Asogun, Irede, Ikare, Ondotedo. Apapa - Ijora, Ajegunle, Dankaka, Tincan Island, Igboejo, Tarqua bay Ojo - Iba, Ishasi, Era, Egan, Eteggin, Igbede, Igbolobi, Ishagira, Tafi. Lagos Mainland- Abule- ijesha, Alagbede, Abulenla, Iganmu, Ijero. FLOOD RISK MAP OF ETI-OSA AND LAGOS ISLAND
Eti-Osa - Obalende, Victoria-Island, Bamgbose, Ilado, Igboefon, Ikate, Alaguntan, Ibeju, Maiyegun, Ibeju, Langbasa, Iranla, Badore.
Lagos Island - Iwaya, Makoko, Ebute-meta, Lagos FLOOD RISK MAP OF IKORODU AND EPE
Ikorodu Majidun, Ebute, Ibese, Isasi, Ilemere, Baiyeku, Ipakan
Epe – Orita.
Agbowa Relief Camp located along Epe- Ifoiki road, Agbowa FLOOD RISK MAP OF IBEJU-LEKKI
Ibeju-Lekki Okunsola, Kuramo Island, Tiye, Mobido, Ebute-lekki. FLOOD RISK MAP OF BADAGRY
Badagry Magbon, Mowo, Gbanko, Moba, Ajara, Isalu, Panko, Agonrin, Wasere. FLOOD RISK MAP OF LAGOS STATE SHOWING ALL THE LOCAL GOVERNMENT AREAS The Land Area (in Kilometres) of the LGAs at High Risk of Flood.
LGAs Land Area At High Total Land Area PERCENTAGE OF Flood Risk (KM) (KM) LAND AREA AT HIGH FLOOD RISK (%) 1 Ifako- Ijaiye 0.18 33.62 O.54 2 Agege 0 16.58 0 Land area measurement of the places 3 Alimosho 7.27 148.06 4.91 vulnerable to high risk of flood was 4 Ikeja 0.84 45.74 1.84 5 Kosofe 35.55 74.12 47.96 estimated per each local government 6 Oshodi 1.45 38.6 3.76 7 Mushin 0.5 17.39 2.86 8 Shomolu 4.46 18.3 24.37 Eti-osa LGA has the highest 9 Ikorodu 45.67 363.68 12.56 percentage (79.38%) of land area at 10 Epe 143.42 875.20 16.39 high risk 11 Badagry 194.38 516.53 37.63 12 Ojo 86.11 196.58 43.80 13 Amuwo-Odofin 94.24 173.38 54.35 Followed by Ajeromi/ Ifelodun – 14 Surulere 12.03 30.72 39.16 66% 15 Lagos Mainland 8.41 22.78 36.92 16 Ajeromi/ Ifelodun 7.76 11.65 66.61 A total of 961.13km2 out of the total land 17 Lagos Island 29.31 82.79 35.4 area of 3339.94km2 in the state (which is 18 Apapa 19.91 32.9 60.52 28.78% is at high flood risk 19 Eti-Osa 133.59 168.3 79.38 20 Ibeju-Lekki 136.05 473.02 28.77 Total 961.13 3339.94 28.78 DURING THE ASSESSMENT, ADDITIONAL LOCATIONS HAVE BEEN IDENTIFIED ACROSS THE STATE WHICH POTENTIALLY MAY SERVE AS RELIEF CAMPS IN THE EVENT OF HIGH CASES OF DISASTER THAT MAY NECESSITATE THE NEEDS FOR MORE RELIEF CAMPS.
• ISEFUN COMMUNITY SENIOR SEC SCHOOL, ISEFUN. • STATE SENIOR HIGH SCHOOL, IPAJA, ALIMOSHO. • STADIUM COMPLEX, IJU, IFAKO-IJAIYE • OJODU JUNIOR GRAMMAR SCHOOL, OJODU. • THE APOSTOLIC CHURCH GRAMMAR SCHOOL, KETU. • MKO MINI STADIUM, JAKANDE, EJIGBO.
THEY ARE ALL LOCATED ON THE MAPS