Derived Flood Assessment
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30 July 2021 PRELIMINARY SATELLITE- DERIVED FLOOD ASSESSMENT Alajuela Limon, Cartago, Heredia and Alajuela Provinces, Costa Rica Status: Several areas impacted by flooding including agricultural areas and road infrastructure. Increased water levels also observed along rivers. Further action(s): continue monitoring COSTA RICA AREA OF INTEREST (AOI) 30 July 2021 PROVINCE AOI 6, Los Chiles AOI 5, Sarapiqui AOI 3, Matina AOI 2, Limon AOI 4, Turrialba AOI 1, Talamanca N FLOODS OVER COSTA RICA 70 km NICARAGUA AOI 6, Los Chiles Satellite detected water as of 29 July 2021 AOI 5, Sarapiqui AOI 3, Matina Canton AOI 2, Limon City AOI 4, Turrialba Caribbean Sea North Pacific Ocean AOI 1, Talamanca Legend Province boundary International boundary Area of interest Cloud mask Reference water PANAMA Satellite detected water as of 29 July 2021 [Joint ABI/VIIRS] Background: ESRI Basemap 3 Image center: AOI 1: Talamanca District, Limon Province 82°43'56.174"W Limon Province 9°34'12.232"N Flood tracks along the Sixaola river observed BEFORE AFTER COSTA RICA Flood track COSTA RICA Flood track Sixaola river Sixaola river PANAMA PANAMA Sentinel-2 / 19 June 2021 Sentinel-2 / 29 July 2021 4 Image center: AOI 2: Limon City, Limon District, Limon Province 83°2'54.168"W Limon Province 9°59'5.985"N Floods and potentially affected structures observed BEFORE AFTER Limon City Limon City Potentially affected structures Evidence of drainage Increased water along the irrigation canal N N 400 400 m m Sentinel-2 / 19 June 2021 Sentinel-2 / 29 July 2021 5 Image center: AOI 3: Matina Canton, Limon District, Limon Province 83°17'6.879"W 10°4'9.376"N Limon Province Increased water levels and potentially inundated road and cropland observed BEFORE AFTER Matina Matina Inundation Increased water 160 m 230 m N N 200 200 m m Sentinel-2 / 24 June 2021 Sentinel-2 / 29 July 2021 6 Image center: 83°41'20.795"W AOI 4: Turrialba, Turrialba District, Cartago Province Cartaco 9°54'38.28"N Province Potential soil erosion and increased water including inundated structures observed BEFORE AFTER Increased water Inundated structures Potential soil erosion Turrialba Turrialba Increased water N N 400 400 m m Sentinel-2 / 19 June 2021 Sentinel-2 / 29 July 2021 7 Image center: AOI 5: Sarapiqui District, Heredia Province 84°0'6.305"W 10°26'6.284"N Heredia Province Increased water levels along the Sarapiqui river observed BEFORE AFTER Sucio river Sucio river Increased water N N 1 1 km km Sentinel-2 / 19 June 2021 Sentinel-2 / 29 July 2021 8 Image center: AOI 6: Los Chiles town, Los Chiles District, Alajuela Province 84°42'13.654"W Alajuela 11°0'25.646"N Province Floods along the Frio river close to the town and inundated agricultural areas observed BEFORE AFTER Increased water close to the town Inundated agricultural area N 1 1 km km Sentinel-2 / 13 January 2021 Sentinel-2 / 29 July 2021 9 SUMMARY OF FINDINGS • Flood tracks along the Sixaola river observed (AOI1) Talamanca District, Limon Province as of 29 July 2021; • Floods and potentially affected structures observed (AOI2) Limon City, Limon District, Limon Province as of 29 July 2021; • Increased water levels and potentially inundated road and cropland observed (AOI3) Matina Canton, Limon District, Limon Province as of 29 July 2021; • Potential soil erosion and increased water including inundated structures observed (AOI4) Turrialba, Turrialba District, Cartago Province as of 29 July 2021; • Increased water levels along the Sarapiqui river observed (AOI5) Sarapiqui District, Heredia Province as of 29 July 2021; • Floods along the Frio river close to the town and inundated agricultural areas observed (AOI6) Los Chiles town, Los Chiles District, Alajuela Province as of 29 July 2021; 10 COPYRIGHTS AND SOURCES Data sources: (3) Ancillary data (1) Satellite Image (Post-event) Administrative boundaries: OCHA, HDX Sentinel-2 / 29 July 2021 at 16:05 UTC Populated places: OpenStreetMap Copyright: Contains modified Copernicus Sentinel Data [2021] Source: ESA Analysis: UNITAR-UNOSAT Production: UNITAR-UNOSAT GOES-16/ABI, Suomi-NPP and NOAA-20/VIIRS / 29 July 2021 Copyright: NOAA/Suomi NPP Source: NOAA and GEOS Rebroadcast (GRB) (2) Satellite Image (Pre-event) Sentinel-2 / 13 January 2021 at 16:06 UTC, 19 June 2021 at UTC, And 24 June 2021 at 16:05 UTC Copyright: Contains modified Copernicus Sentinel Data [2021] Source: ESA 11 @UNOSAT @UNITAR.unosat UNOSAT, United Nations Institute for Training T +41 022 917 4720 and Research (UNITAR) E [email protected] 7 bis, Avenue de la Paix, CH-1202 Geneva 2, www.unosat.org Switzerland.