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Flood Risk Perception Survey, risk education and outreach

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Under the US National Flood Insurance Program, lands behind levees certified to protect against the 100‐year flood are considered outside of the officially‐recognized “floodplain.” However, such lands are still vulnerable to flooding that exceeds the design capacity of the levees—known as residual risk. In the Sacramento‐San Joaquin Delta of California,  lands below sea level are considered not “floodplain” and are open to residential and commercial development because they are “protected” by levees. Residents are not informed that they are at risk because officially they are not in the floodplain. We surveyed residents of a recently constructed subdivision in Stockton, California to assess their awareness of their risk of flooding.

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CASE STUDY: Hazard Mapping in the Poiqu/Bhote Kosi Basin

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The case study discusses the methodology used for assessing Glacial Lake Outburst Flood (GLOF) risk in the Poiqu/Bhote Kosi basin- a transboundary basin between Tibet Autonomous Region of China and Nepal. The main steps in the assessment include the simulation of the outburst using a mathematical model; analysis of the flood propagation along the river stretch of 100 km; and analysis of the socio-economic impacts in the downstream areas of the lake through field study.

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Methods for flood risk and vulnerability mapping: experiences from the Ratu watershed, Nepal

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The method used to assess the flood risk and vulnerability mapping consisted in:

  • Assessing vulnerability-Tools and methods
  • Field Survey and group discussions
  • Mapping for Preparedness
    The mapping was done adopting three different approaches:

-          A geomorphic approach to hazard mapping using geographical information systems (GIS) and remote sensing (RS)

-          Hazard mapping through the measurement of rainfall-runoff processes using US Army Corps of Engineers Hydrological Engineering Corporation’s River System Analysis (HEC-RAS) model

-          Social flood hazard mapping based on local people’s perceptions and experiences

The main sources of information were:

Maps, aerial photographs, satellite images, household survey, group discussions, field observation and published and unpublished documents.

GIS based software such as ArcView, ILWIS, and HEC-GeoRas were used for data processing and analysis.

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Implications of Climate Change for Rhode Island Water Utilities

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The Rhode Island Department of Health (HEALTH), Division of Environmental and Health Services Regulation, Office of Drinking Water Quality sought research solutions on the potential effects of climate change on Rhode Island drinking water resources, existing infrastructure and the potential for flooding of critical facilities. Tetra Tech is working with HEALTH and the primary water utilities in the state of Rhode Island to conduct an assessment of the main climate change challenges affecting Rhode Island. Tetra Tech is conducting a climate impacts assessment that includes sea level rise analysis, watershed analysis, climate hazard assessment, vulnerability assessment, and risk assessment for three time horizons, and two emissions scenarios. Our approach involves collecting Global Circulation Model,

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IFM approach for flood mitigation in watershed scale

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A method for all stakeholders to participate in decision making. The purpose of IFM is optimum use of flood opportunities with minimum flood damages to society and environment. It is a new approach whereby all aspects of flood issues – including: technical, social, economical, environmental, Institutional and legal aspects – are considered in flood management decisions. Case study: Kan Basin” was studies for a watershed in Tehran province, Iran. Selected strategies are given to  stakeholders for them to select the final combined strategy to be implemented in the watershed. In the second category, duties of the agencies and institutions are as assigned through the prepared Incident ‍Command System (ICS) and Emergeny Action Plan (EAP) for reduction of the remained flood risk in time of the crisis.

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Mapping Vulnerability – A global initiative to measure, map and meet the needs of individuals and communities vulnerable to select water-related diseases in the face of environmental change

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This research project will undertake to map global vulnerability (current and projected) to selected water-related diseases within a Geographical Information System (GIS) incorporating environmental factors, current burden of illness, socio-economic vulnerabilities and expected impacts of global environmental change.  Factors to be incorporated into the analyses include, but are not limited to: demographics (population growth, density, migration, urbanization); environmental (temperature, precipitation, land use patterns); pathogen etiology and life cycle; access to (safe drinking water, adequate sanitation, public health system); and socio-economic variables (poverty, literacy rates, education levels, community support systems).

 

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The Water, Sanitation and Hygiene (WASH) cluster approach

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The cluster approach is one pillar of the humanitarian reform led by the Inter-Agency Standing Committee to improve effectiveness of the humanitarian response in the framework of a Global Partnership Principle. The Water, Sanitation and Hygiene cluster was set up in 2006 as one of the 11 clusters established by the reform.

 

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