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
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