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Hands on training on locating Hands on training on locating buildings vulnerable to flood buildings vulnerable to flood

damagedamage

Dr. A.K.M. Saiful IslamInstitute of Water and Flood Management (IWFM)Bangladesh University of Engineering and Technology (BUET)

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Introduction to Surface hydrology procedures

This training will be on:

1. Introduction to Spatial Analysis

2. Flood Zone statistics of the area

3. Flood Zone Analysis and find wet Homes

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1. Introduction of Spatial Analyst

• First load the Spatial Analyst – click on Tools

> Extension– Check the box

left to Spatial Analyst

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2. Flood Zone Satistics

• Given data:– Flood Zone Map– Landuse data of a city

• Problem:– Insurance company and city planners wants

to locate buildings and other assets susceptible to flood damage by examining flood zone areas.

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Add land use Map

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Add Flood Map

Flood raster map

Flood map on top of landuse map

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Change Symobology of landuse map

• Double click on landuse map

• Click on Symbology tab

• Select unique values

• Scroll value fields as Landue type2

• Click Add All Values

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Landuse map with landuse type

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Zonal Statistics

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Flood Zone Statistics

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Use the chart to answer these questions

• What are the land use types in the flood zone?

_________________

• Which one has the greatest area in the flood zone?

_________________

• Which zoning type is most likely to contain homes?

_________________

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3. Flood zone analysis to find wet homes

• Create a chart which will serve as a planning tool to identify data used or created and record each task to be performed.

Landuse Residential

Flood

Wet Home

Map Query

Map Query

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Find residential zone

Residential area has zone value = 3

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Find only residential area

• Type [landuse] == 3

• Click Evaluate will create map of residential area and rename it as “Residential”

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Flood Zone Analysis

• Execute following Query using Raster calculator [flood] & [Residential] • Click on Evaluate. It will create wet homes map.

Rename the raster map as “Wet Homes”

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Map of Residential Area

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Wet Homes

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Conclusion

• The wet homes contains residential areas inside the flood zone.

• These parcels could be targeted for flood insurance.

• City planners could also use this information for disaster planning services.