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Floods are natural disasters that occur when an area experiences an overflow of water onto normally dry land. These events can result from various causes and have significant impacts on communities, the environment, and infrastructure. Here are key aspects of floods:
'''Floods''' are natural disasters that occur when an area experiences an overflow of water onto normally dry land. These events can result from various causes and have significant impacts on communities, the environment, and infrastructure. Here are key aspects of floods:
[[File:Flooded-neighborhood 1.jpg|thumb|600px|Flooding (Source: Ready.gov<ref>Retrieved from https://www.ready.gov/floods on Oct 24, 2024</ref>)]]


===Causes of Floods===
===Causes of Floods===


1. Heavy Rainfall:
* Heavy Rainfall: Prolonged and intense rainfall can lead to the saturation of soil, exceeding its capacity to absorb water. This runoff contributes to surface water accumulation and potential flooding.
Prolonged and intense rainfall can lead to the saturation of soil, exceeding its capacity to absorb water. This runoff contributes to surface water accumulation and potential flooding.
* Storm Surges: Coastal areas can experience flooding due to storm surges, which are abnormal rises in sea level generated by storms, especially tropical cyclones.
 
* Snowmelt: Spring thaw or sudden warming can cause the melting of snow, leading to increased water runoff and the potential for river or urban flooding.
2. Storm Surges:
* Dam or Levee Failures: Failure of dams or levees can release large volumes of water, causing downstream flooding.
Coastal areas can experience flooding due to storm surges, which are abnormal rises in sea level generated by storms, especially tropical cyclones.
 
3. Snowmelt:
Spring thaw or sudden warming can cause the melting of snow, leading to increased water runoff and the potential for river or urban flooding.
 
6. Dam or Levee Failures:
Failure of dams or levees can release large volumes of water, causing downstream flooding.


=== Types of Floods ===
=== Types of Floods ===
4. Flash Floods:
Flash floods result from intense rainfall over a short period, often in mountainous or urban areas. They can lead to rapid and unexpected rises in water levels.


5. River Flooding:
* Flash Floods: Flash floods result from intense rainfall over a short period, often in mountainous or urban areas. They can lead to rapid and unexpected rises in water levels.
Overflow of rivers and streams due to excessive rainfall or the melting of snow in upstream areas can lead to river flooding.
* River Flooding: Overflow of rivers and streams due to excessive rainfall or the melting of snow in upstream areas can lead to river flooding.


* '''Coastal Floods''': Result from storm surges, high tides, or tsunamis, causing seawater to inundate coastal areas.
* Coastal Floods: Result from storm surges, high tides, or tsunamis, causing seawater to inundate coastal areas.
* '''Urban Floods''': Occur in urban areas due to inadequate drainage systems overwhelmed by heavy rainfall.
* Urban Floods: Occur in urban areas due to inadequate drainage systems overwhelmed by heavy rainfall.
* '''Pluvial Floods''': Also known as surface water floods, these happen when heavy rainfall creates a flood event independent of an overflowing water body.
* Pluvial Floods: Also known as surface water floods, these happen when heavy rainfall creates a flood event independent of an overflowing water body.


===Impacts of Floods===
===Impacts of Floods===


1. Infrastructure Damage:
* Infrastructure Damage: Floodwaters can damage roads, bridges, buildings, and other infrastructure, disrupting transportation and utilities.
Floodwaters can damage roads, bridges, buildings, and other infrastructure, disrupting transportation and utilities.
* Loss of Lives and Property: Floods pose a significant risk to human life and property. Rapidly rising water levels can lead to evacuations and, in severe cases, loss of life.
 
* Economic Impact: Flooding can have long-term economic consequences, affecting agriculture, businesses, and communities. Recovery efforts can be costly.
2. Loss of Lives and Property:
* Environmental Consequences: Floods can alter ecosystems, impact wildlife, and introduce pollutants into water bodies, affecting the environment.
Floods pose a significant risk to human life and property. Rapidly rising water levels can lead to evacuations and, in severe cases, loss of life.
* Public Health Risks: Contaminated floodwaters can pose health risks, including the spread of waterborne diseases.
 
3. Economic Impact:
Flooding can have long-term economic consequences, affecting agriculture, businesses, and communities. Recovery efforts can be costly.
 
4. Environmental Consequences:
Floods can alter ecosystems, impact wildlife, and introduce pollutants into water bodies, affecting the environment.
 
5. Public Health Risks:
Contaminated floodwaters can pose health risks, including the spread of waterborne diseases.


==Flood Data Analysis==
==Flood Data Analysis==
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=== Historical data ===
=== Historical data ===
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|RAPID NRT Flood Maps
|Near Real-time and archival data of High-resolution (10 m) flood inundation dataset over the Contiguous United States, developed based on the Sentinel-1 SAR imagery (2016-current) archive, using an automated Radar Produced Inundation Diary (RAPID) algorithm. NRT data will be update as soon as SAR images available and done processed.
|
|[https://registry.opendata.aws/rapid-nrt-flood-maps/ AWS link]
|}
|}
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=== Real-time monitoring ===
=== Real-time monitoring ===
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|Flood and other hydrometeorological forecast by regional river forecast centers. For some river forecast center, for example, SE forecast center, flood inundation zone forecast is also given.  
|Flood and other hydrometeorological forecast by regional river forecast centers. For some river forecast center, for example, SE forecast center, flood inundation zone forecast is also given.  
|e.g. [https://www.nwrfc.noaa.gov/rfc/ Northwest], [https://www.cnrfc.noaa.gov/ southeast; California Nevada]; [https://www.weather.gov/marfc/ Middle Atlantic] (up to 10 days ahead)
|e.g. [https://www.nwrfc.noaa.gov/rfc/ Northwest], [https://www.cnrfc.noaa.gov/ southeast; California Nevada]; [https://www.weather.gov/marfc/ Middle Atlantic] (up to 10 days ahead)
|-
|NOAA National Water Model Short-Range Forecast
|The National Water Model (NWM) is a US-wide water resource model launched by NOAA in 2016. It forecasts key water variables like snowpack, soil moisture, and streamflow using data from meteorological models. The Short Range Forecast cycles hourly and provides streamflow predictions up to 18 hours ahead. The data is updated in four-week intervals.
|
|[https://registry.opendata.aws/noaa-nwm-pds/ AWS lik]
|}
|}
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=== Seasonal outlook ===
=== Seasonal outlook ===
<div style="margin-left: 179px;">
<div style="margin-left: 90px;">
{| class="wikitable"
{| class="wikitable" style=width:70em
|+
|+
!Dataset  
!Dataset  
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=== Seasonal forecast: ===
=== Future projection ===
 
<div style="margin-left: 90px;">
* drought outlook: https://www.cnrfc.noaa.gov/?product=cpcSDO&lat=38.234&lng=-118.666 https://experience.arcgis.com/experience/29f1122ca1cd46368a614c41de26eb53/
{| class="wikitable" style=width:70em
*
|+
 
!Dataset
=== Near-time monitoring ===
!Description
 
!Map viewer link
* NASA tropical cyclone: https://disasters-nasa.hub.arcgis.com/ also soil moisture.
!Data download link
* https://disasters-nasa.hub.arcgis.com/
|-
* Fathom global flood map: not open-source https://www.fathom.global/product/global-flood-map/
|Future frequency of flooding estimated by European Environment Agency
|Change in frequency of flooding in Europe under projected sea level rise (from 2010 to 2100; RCP 4.5)
|
|[https://www.eea.europa.eu/en/datahub/datahubitem-view/1e006660-816d-49da-aaa8-d44cb305efee?activeAccordion=1070108%2C1070120 Access]
|}
</div>


=== Long-term future projection ===
=== Fatalities associated with flooding ===


'''<br />
* 1980-2022 by EEA https://www.eea.europa.eu/en/datahub/datahubitem-view/890fbce5-f06e-495a-88c7-b26707c2653f
hydrological drought based on streamflow: https://waterwatch.usgs.gov/index.php?id=ww_drought'''
* https://www.eea.europa.eu/publications/economic-losses-and-fatalities-from
 
'''storm-tide monitoring: https://www.usgs.gov/special-topics/water-science-school/science/storm-tide-monitoring#overview'''
 
'''Map information of atmospheric and hydrologic sites: https://maps.waterdata.usgs.gov/mapper/index.html'''
 
*
 
 
severe weather refers to convective storm
 
 
 
Flood hazard data by FEMA: https://experience.arcgis.com/experience/e492db86d9b348399f4bd20330b4b274/page/Page/?views=Effective%2CSea-Level-Dataset
 
FEMA flooding: https://gis-fema.hub.arcgis.com/pages/flooding https://webapps.usgs.gov/infrm/fdst/
 
sea level rise viewer: https://coast.noaa.gov/slr/#/layer/sce/4/-10957408.272357693/4740085.158735173/5/satellite/none/0.8/2050/interHigh/midAccretion
 
=== NWS: Day 1-8; NWS GIS viewer is a treasure. ===
 
* flood forecast: https://water.noaa.gov/
* GIS viewer provides almost everything: https://viewer.weather.noaa.gov/general#layers=42904+40090&x=-84.22612&y=44.9147&z=7&panel=layer
*graphical tropical weather outlook:
*Storm surge
 
climate outlooks (day 6 and above) are from '''CPC:'''
 
* seasonal drought outlook
* 8-14 days wildfire drought hazard
* fire weather outlooks (SPC) Day 1-8
* wildfire forecast: day 1-7
 
 
'''USGS Post-Fire Potential Flash Flood Impacts, so flood after fire? debris flow'''
 
CDC/ATSDR social vulnerability index
 
 
Tropical products:
 
 
== Coastal change ==
Flooding is largely related to hurricane and then related to coastal changes
 
USGS coastal hazard change portal: https://marine.usgs.gov/coastalchangehazardsportal/
 
National hurricane center: https://www.nhc.noaa.gov/refresh/graphics_at4+shtml/102341.shtml?cone#contents
 
USGS Hurricane resources: https://www.usgs.gov/hurricanes
 
National Weather Service River Observations and Forecast: https://water.weather.gov/ahps/forecasts.php A map viewer, contains information of observations, forecast, and long-range flood outlook, as well as flood hazard warning. soil moisture, stream analysis anomaly, flood inundation.
 
Flood Inundation Mapping - Loss Estimation: https://fim.wim.usgs.gov/fim/<nowiki/>https://www.usgs.gov/mission-areas/water-resources/science/flood-inundation-map-fim-libraries
 
ESRI disaster data: https://disasters-geoplatform.hub.arcgis.com/pages/disaster-data-layers has data for specific disasters. 
 
Historical Evaporative stress index: https://disasters-geoplatform.hub.arcgis.com/pages/visualizing-areas-at-risk-evaporate-stress-index, 5-km, a predictive index for wildfire risk. 
 
historical damage assessment for past hurricanes and floods: https://disasters-geoplatform.hub.arcgis.com/pages/historical-damage-assessment-database 
 
https://global-flood-database.cloudtostreet.ai/#interactive-map
 
https://www.earthdata.nasa.gov/learn/find-data/near-real-time/hazards-and-disasters/floods
 
https://ecology.wa.gov/water-shorelines/shoreline-coastal-management/hazards/floods-floodplain-planning/risk-map/floodplain-planning-for-homeowners
 
https://www.fathom.global/product/global-flood-map/?utm_term=flood%20data&utm_campaign=Flood+Mapping+%7C+Search+%7C+US+%7C+Loom&utm_source=adwords&utm_medium=ppc&hsa_acc=7702258272&hsa_cam=21540690455&hsa_grp=164273509846&hsa_ad=708127338845&hsa_src=g&hsa_tgt=kwd-391157476948&hsa_kw=flood%20data&hsa_mt=e&hsa_net=adwords&hsa_ver=3&gad_source=1&gclid=Cj0KCQjwtsy1BhD7ARIsAHOi4xYI1ExluVEgylOPATHIFP_GPnWy_jLph_LqrLAJ7h1ddlYUsiaI10saAkxhEALw_wcB
 
https://kingcountyfloodcontrol.org/flood-resources/floodplain-map/
 
https://www.floodsmart.gov/historical-nfip-claims-information-and-trends?map=countries/us/us-all&region=us&miny=all&maxy=all&county=&gtype=country
 
https://coast.noaa.gov/slr/
 
https://www.nwrfc.noaa.gov/rfc/
 
 
Storm surge inundation map: https://gis-fema.hub.arcgis.com/apps/852ca645500d419e8c6761b923380663
 
NOAA storm prediction center: https://gis-fema.hub.arcgis.com/documents/b4d41dd8833e43beb689bc701d6e617d     
 
==Data Visualization==
 
<div style="margin-left: 250px">
 
</div>


==Reference==
==References==

Latest revision as of 19:54, 24 October 2024

Floods are natural disasters that occur when an area experiences an overflow of water onto normally dry land. These events can result from various causes and have significant impacts on communities, the environment, and infrastructure. Here are key aspects of floods:

Flooding (Source: Ready.gov[1])

Causes of Floods

  • Heavy Rainfall: Prolonged and intense rainfall can lead to the saturation of soil, exceeding its capacity to absorb water. This runoff contributes to surface water accumulation and potential flooding.
  • Storm Surges: Coastal areas can experience flooding due to storm surges, which are abnormal rises in sea level generated by storms, especially tropical cyclones.
  • Snowmelt: Spring thaw or sudden warming can cause the melting of snow, leading to increased water runoff and the potential for river or urban flooding.
  • Dam or Levee Failures: Failure of dams or levees can release large volumes of water, causing downstream flooding.

Types of Floods

  • Flash Floods: Flash floods result from intense rainfall over a short period, often in mountainous or urban areas. They can lead to rapid and unexpected rises in water levels.
  • River Flooding: Overflow of rivers and streams due to excessive rainfall or the melting of snow in upstream areas can lead to river flooding.
  • Coastal Floods: Result from storm surges, high tides, or tsunamis, causing seawater to inundate coastal areas.
  • Urban Floods: Occur in urban areas due to inadequate drainage systems overwhelmed by heavy rainfall.
  • Pluvial Floods: Also known as surface water floods, these happen when heavy rainfall creates a flood event independent of an overflowing water body.

Impacts of Floods

  • Infrastructure Damage: Floodwaters can damage roads, bridges, buildings, and other infrastructure, disrupting transportation and utilities.
  • Loss of Lives and Property: Floods pose a significant risk to human life and property. Rapidly rising water levels can lead to evacuations and, in severe cases, loss of life.
  • Economic Impact: Flooding can have long-term economic consequences, affecting agriculture, businesses, and communities. Recovery efforts can be costly.
  • Environmental Consequences: Floods can alter ecosystems, impact wildlife, and introduce pollutants into water bodies, affecting the environment.
  • Public Health Risks: Contaminated floodwaters can pose health risks, including the spread of waterborne diseases.

Flood Data Analysis

FEMA flood products

Dataset Description Map viewer link Data download link
FEMA Flood map FEMA[2] provides flood maps for people to understand the flood risk of their community. The map can be accessed via an online viewer. National Flood Hazard Layer Viewer
U.S. historical flood risks and costs An interactive data tool to understand the flood cost. Flooding cost data is estimated using insurance claims from National Flood Insurance Program (data website) and FEMA's Individuals and Households Program (data website), which is also available for downloading. View
National Risk Index (NRI)[3] NRI is a dataset and online tool built by FEMA[2] to help illustrate the risk of United States communities for 18 natural hazards. It was calculated expected annual loss resulting from hazards times social vulnerability and then divided by resilience. Both composite index of all 18 hazards as well as index for each individual hazard are given. Social vulnerability and community resilience information are also given. View Download
FEMA web disaster summaries This dataset contains financial assistance values, including the number of approved applications, as well as individual, public assistance, and hazard mitigation grant amounts. Download
OpenFEMA Dataset FEMA also provides many other open datasets on disaster information, emergency management, assistance, hazard mitigation etc. in industry standard, machine-readable formats. Download


Historical data

Dataset Description Map viewer link Data download link
USGS Historical flooding data[4] Information about past (from 1900 to present) regional flood events that involved a national coordinated USGS response. Flood event viewer
NWS historical flood data[5] Historical flood information for the past by middle Atlantic river forecast center. Download
USGS water data Detailed site-level data about stream flow, such as gage height, discharge, both real-time monitoring, historical information, and 7-day forecast is provided. Gage data typically are recorded at 15- to 60-minute intervals. View Download
Climate Risk and Resilience Portal Data Group Dynamical downscaled future climate projection including temperature, precipitation, and fire weather index provided by the Center for Climate Resilience and Decision Science (CCRDS) at Argonne National Laboratory[6]. Data is at a resolution of 12 km2. Link
Global Flood Database[7] It map the major flood events recorded by the DFO Flood Observatory since the beginning of the satellite records, using NASA's Aqua and Terra satellites. Population exposure estimates are derived from overlaying the flood maps with the Global Human Settlement Layer (GHSL) population data. ML-based precipitation estimates are also provided at 0.25degree resolution from 1983 to 2021. View
World Atlas of Large Flood Events[8] It contains statistics of flood, such as number, duration, causes, severity, as well as consequences of flood such as fatalities, displaced and damage, from year 1985 to 2002. Note, some of the information on the website is no longer available or maintained.
RAPID NRT Flood Maps Near Real-time and archival data of High-resolution (10 m) flood inundation dataset over the Contiguous United States, developed based on the Sentinel-1 SAR imagery (2016-current) archive, using an automated Radar Produced Inundation Diary (RAPID) algorithm. NRT data will be update as soon as SAR images available and done processed. AWS link

Real-time monitoring

Dataset Description Map viewer link Data download link
MODIS Near-real time global flood product[9] Near-time flood product retrieved from Terra and Aqua satellite images. It is daily, near-global, ~250 m resolution. View Download (detailed download instruction here)
Global Flood Monitoring system[10] A global flood monitoring system based on a hydrological runoff and routing model, developed by University of Maryland. It uses real-time satellite retrieved precipitation as input and has streamflow as output. 3-hourly flood Detection/Intensity for year 2001-2022 at 1/8th degree resolution is available for downloading. View Download
USGS water data Detailed site-level data about stream flow, such as gage height, discharge, both real-time monitoring, historical information, and 7-day forecast is provided. Gage data typically are recorded at 15- to 60-minute intervals. View Download
USGS flood inundation mapper View

Short-term outlook (up to 10 days ahead)

Dataset Description Map viewer link Data download link
River flood outlook by NWS[11] River flood water outlook in the next 5 days by National Weather Service. View
National flood hazard outlook by NWS[12] A 7-day outlook of potential flash, river, and tidal flood hazards. Both flood severity and potential impacts are given. View
Forecast by local river forecast center Flood and other hydrometeorological forecast by regional river forecast centers. For some river forecast center, for example, SE forecast center, flood inundation zone forecast is also given. e.g. Northwest, southeast; California Nevada; Middle Atlantic (up to 10 days ahead)
NOAA National Water Model Short-Range Forecast The National Water Model (NWM) is a US-wide water resource model launched by NOAA in 2016. It forecasts key water variables like snowpack, soil moisture, and streamflow using data from meteorological models. The Short Range Forecast cycles hourly and provides streamflow predictions up to 18 hours ahead. The data is updated in four-week intervals. AWS lik

Seasonal outlook

Dataset Description Map viewer link Data download link
120-day forecast by NW River forecast center 120-day forecast for some river gages are provided. A seasonal Columbia river minimum stage outlook is also provided to assist with long-range planning. https://www.nwrfc.noaa.gov/rfc/ Download

Future projection

Dataset Description Map viewer link Data download link
Future frequency of flooding estimated by European Environment Agency Change in frequency of flooding in Europe under projected sea level rise (from 2010 to 2100; RCP 4.5) Access

Fatalities associated with flooding

References

  1. ↑ Retrieved from https://www.ready.gov/floods on Oct 24, 2024
  2. ↑ 2.0 2.1 https://www.fema.gov/
  3. ↑ https://hazards.fema.gov/nri/
  4. ↑ https://www.usgs.gov/mission-areas/water-resources/science/historical-flooding#overview
  5. ↑ https://www.weather.gov/marfc/HistoricalFloods
  6. ↑ https://disgeoportal.egs.anl.gov/portal/home/group.html?id=97c3ff1057954147b1549b09a74f77c5#overview
  7. ↑ https://global-flood-database.cloudtostreet.ai/#interactive-map
  8. ↑ https://floodobservatory.colorado.edu/archiveatlas/index.htm
  9. ↑ https://www.earthdata.nasa.gov/learn/find-data/near-real-time/modis-nrt-global-flood-product
  10. ↑ http://flood.umd.edu/
  11. ↑ https://www.wpc.ncep.noaa.gov/nationalfloodoutlook/
  12. ↑ https://www.weather.gov/owp/operations-national-fho-archive?d=2024-08-12
Retrieved from "http://climateriskwiki.uw.edu/index.php?title=Flooding&oldid=1704"