FLOOD VULNERABILITY ASSESSMENT AND MAPPING OF 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 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 65 13 The altitude of Lagos state ranges from 3 Alimosho 77 -1 77metres (above the sea level) to 4 68 -4 5 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 70 -12 Alimosho LGA, other high altitudes in 10 Epe 66 -8 the state are situated in Ifako/Ijaiye 11 37 -6 (76m), Ikorodu (70m), Ikeja (68), and 12 Ojo 32 -7 13 Amuwo-Odofin 40 -7 Agege (65m). 14 33 -8 15 33 -20 16 Ajeromi/ Ifelodun 21 -9 The lowest altitude in the state is 17 52 -25 18 31 -12 located in Lagos Island, 25 metres 19 Eti-Osa 35 -13 below the sea level. 20 Ibeju- 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