Questions tagged [flood]

A flood is an overflow of water that submerges land which is usually dry. Within GIS we often want to model a flood with terrain models.

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19 views

How to relate flood events (points) with flood conditioning rasters for Machine Learning?

I have point shapefile of flood events which has either flood occur or not. On the other hand, I have 13 flood conditioning rasters i.e. slope, elevation, rainfall etc. these are all at 30 meter ...
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20 views

How to edit TIN surface by polygon

I'm doing a 2D hydraulic flood study of rivers in a 63 km2 basin. I have a RASTER of the topography (1x1 meters) that I have passed to TIN using ARCMAP. Giving a z=0.3 meters, I get a TIN network with ...
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How do I “flood” a terrain in Cesium to represent a high water level

I am thinking about using a plane object to represent a water level by rendering it as a certain height above ground using Cesium. Is there any example code that
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31 views

Spatial join - allocate values from joined polygon based on input polygon

I'm trying to determine population inside Special Flood Hazard Areas. To do this I'm doing a spatial join of census shapefiles with the FEMA National Flood Hazard Layer, using the Boolean field ...
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25 views

Creating flow path arrows from polygons with flow angle and flow velocity attributes using ArcGIS Pro [duplicate]

I have a polygons feature class from a flood model in a TIN like structure in ArcGIS Pro. The polygons have attributes for flow direction (radians from due east) and flow velocity. I am wanting to ...
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36 views

Creating local copy of an online Potential Flood Inundation Map

I am completely stuck, usually I can figure out how to create a local copy of hosted services, but this one I can't seem to get anything to work and any suggestions would be great. Currently I can ...
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1answer
161 views

Google Earth Engine - Blend Sentinel-1 SAR Images?

Does anybody know why I am getting these strips across my Sentinel-1 images and how to fix it? I am using multiple images over Mozambique between January 1st and January 13th. I want to use this ...
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26 views

Will Polygon Volume work if my polygon does not represent a constant plane height?

I am working on calculating flood inundation volume in ArcMap. I have polygon layers that represent flood inundation at specific recurrence intervals. My layers do not have a constant plane height ...
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57 views

Creating cumulative friction map

I am looking at bottom friction (Manning's n) values in relation to storm surge as large volumes of water flow over a surface. In order to calculate total head loss occurring as water passes from the ...
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114 views

GRASS GIS: Time series of overland flow from r.sim.water

I am trying to perform an overland flow routing on a large area using r.sim.water in GRASS GIS. I've looked at other answers and made sure to set my computational region to the elevation raster I'm ...
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2answers
129 views

Creating contours based on polyline using ArcMap?

I would like to create a simple floodplain map. I have LiDAR data with 1 meter accuracy. I have clipped it to a small area of interest that my computer can handle processing the LiDAR. I want to ...
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252 views

Assigning XS Cut Line Attributes like River/Reach Name, Stationing, Bank Lines, etc?

I'm working on a flood inundation project as my research study of my course. I am now assigning XS Cut Line Attribute (after constructing the XS Cut Lines) in HEC-Georas > RAS Geometry > XS Cut Lines ...
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34 views

ArcHydro Point to Stream WSE DEM error

I have been trying to figure out how to make a flood delineation map, and the tool runs, but I'm getting this error "001003: Datum conflict between input and output." I thought this would be as simple ...
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How to visualize inundation using Sentinel 1 SAR Data?

I am trying to visualize flooding after hurricane Harvey that made landfall on August 25-26 2017. Based on this video, I've been able to obtain the basics of Sentinel-1 SAR imagery. Sentinel 1 comes ...
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47 views

Seeking vector file of extent of flood plain of 2010 Pakistan Floods?

I am looking to locate a shapefile or any vector file that can be used for analysis I am conducting of change in size of cropland in the Punjab region of Pakistan. The file of interest would reflect ...
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165 views

Determining flood extents based on a daily flow? [closed]

I have a DEM raster and daily average flows (e.g., 50Ml/day). And I want to determine how far the water extent goes when the flow accumulates for 7 days based on 50 ml per day?
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567 views

Showing overland flow route on DEM in QGIS?

I've been asked to produce a risk map at work which will show the possible flood route from sewers that surcharge (flood) during heavy rainfall. This is basically where I know the x-y coordinate (OS ...
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105 views

Issue with FEMA OGC Web Feature Service returning HTTP 400 error when attempting to download GML file

I'm trying to use an OGC web feature service in some software I am involved in developing. The service is described at the bottom of this page: https://hazards.fema.gov/femaportal/wps/portal/NFHLWMS ...
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136 views

ArcGIS Calculate flooding area based on input amount of water

I have created a DEM based on historical maps from 1816. I'm supposed to calculate the flooded area for certain amounts of water (in m³/s). I intended to do it with ArcHydro - however, as far as I ...
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24 views

Measuring flood mitigation effectiveness in river at different time using ArcGIS Desktop?

I am trying to measure the effectiveness of flood mitigation in a river using ArcGIS 10.2. Data available to me are the left and right bank polyline of 4 years , settlement data and point data where ...
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1answer
176 views

Multi-Spectral High Resolution Satellite images for flood events

I'm searching for multi-spectral high resolution satellite images for flood events. I found a database of flood events from this link with dates and approxiamte locations (polygons) and I used the ...
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1answer
44 views

Converting a point file, into a smoother set?

I am currently attempting to show how a coastal area was flooded from the 2010 Mentawai Ocean tsunami on the Pagai Islands. I currently have a DEM and a DEM which I have sourced from a point data set, ...
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1answer
207 views

Maximum water extent JRC dataset [closed]

I am trying to map the maximum water extent in a certain area. Therefore I thought to use the JRC dataset by using the 'max_extent' band. The code however gives me the following error: "max_extent" is ...
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176 views

Spatial prediction in GIS [closed]

I have a number of images, (these could be vectorised) that are label classifications. There are only 2 classes, 1 or 255. Each image is from a different date. For each date I also have data that can ...
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2answers
238 views

Increasing Flood Plain

I am doing a project where we are attempting to determine how many more buildings would flood if the FEMA flood plain increased by 1',2' and 5'. I have the elev of the flood plain rasters from lidar ...
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1answer
163 views

How to approximate the elevation of a shapefile in any pixel of a grid using a digital terrain model?

Introduction I am working on some flood maps of a given region. As the data is confidential, I will try to stay as general as possible without any loss of relevant information. The truth is, my ...
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1answer
31 views

Finding Vector data that is in the area of a specific value of Raster data

I am doing a flooding analysis and would like to know how many roads would be flooded at certain elevations. The roads are in vector data format, while the elevation information is in raster. What ...
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2answers
4k views

Converting polyline to polygon in ArcGIS Desktop for floodplain map?

I'm using ArcGIS Desktop 10.5 and working with a flood map from FEMA, which uses polylines with distinct attributes for each hazard zone (1%, 0.2%, floodway, etc). I'm trying to convert these ...
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1answer
199 views

HEC-RAS limitation on cross sections?

For every cross-section profile, Manning's value is assigned. There are numerous values in a single cross-section profile but HEC-RAS allows only 20 values per cross-section. How can I deal with ...
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381 views

Using Python to extract flood hazard info from National Flood Hazard Layer (NFHL) using any given lat/long point? [closed]

Can Python be used to extract flood hazard classifications from National Flood Hazard Layer (NFHL) site using any given lat/long point? Specifically the following seven classifications: 1% Annual ...
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1answer
3k views

Generate flood map using qgis [closed]

How can I generate a flood inundation map and flood depth using QGIS within 3 hours?
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162 views

Flood Plain Mapping using HEC-GeoRAS and ArcMap?

How can I get complete bounding polygon of XS CutLines for flood plain mapping (Flood Inundation Mapping) using HEC-GeoRAS and ArcMap 10.3? When I tried to perform this task, the bounding polygon ...
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1answer
498 views

Locating flooded area by creating buffer with elevation around points using ArcGIS Desktop?

I have a shapefile with points, that each have an elevation in their attribute tabel, based on how high the water level is, at a given return period. I need to create a buffer around these points at ...
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2answers
1k views

Creating flood area based on connected pixels of DEM in ArcGIS Desktop?

I am trying to show the area of flooding that occurs when bodies of water increase by different increments, like 0.5, 1, 1.5 meters, etc.. for all of Tanzania. I have a DEM with all of the bodies of ...
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2answers
1k views

Flood Inundation Mapping In HEC-RAS?

I'm getting this output as a result of discharge values while doing flood inundation mapping. In some areas there are breaks as indicated by red arrows. If this result is correct what would be the ...
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1answer
257 views

Exporting complete river profile from hec-ras into ArcMap?

Whenever i import the data from hec-ras the result is the same, what mistake am i making here?
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2answers
200 views

Substracting rasters using ArcGIS Raster Calculator?

I need to adjust a DEM (raster) and I was wondering if the Raster Calculator is the right tool to use, and how? I’m modelling floods in Xochimilco (Mexico) and via OpenStreetMap I have acquired the ...
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1answer
77 views

Solving computing time problem when grid size element increases in flood model?

I want to create high resolution and high accuracy "area of inundation" map using FLO-2D Model. I have high resolution Digital Elevation Model (DEM) and I must show small topographic details on my ...
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1answer
107 views

DEM showing areas in the ocean to be greater than 0m (my MSL in my project)

I am a new GIS student currently working on a coastal flood model in arc map, where I intend to create flood polygons at various heights above 0m contour (MSL)to represent the extent of area flooded ...
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1answer
82 views

What Algorithms to use for Levee breach Analysis?

I have a (relatively) High resolution DSM of the Country side, and want to figure out the extent of area that will be flooded if the Embankment/levee fails at a a given point. Something like this: ...
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1answer
2k views

Explanation of HAND (height above nearest drainage) model procedure

i tried to follow this procedure Spatial Analysis - Calculate a cells elevation (height) above the nearest stream cell but i have some problem to understand everything. I mean the 2th answer in the ...
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1answer
614 views

How to design a flood with water elevation on a specific point?

Actually I have to know the flooding area caused by a rise of the water level due to the implementation of a dam. So I would like to know if there is an extension or any tool in QGIS or GRASS which ...
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1answer
397 views

Estimating population in flood zones?

I have a census tract shapefile with the population of a minority group and total population. I am trying to analyze this group by high and low risk flood zones. The problem is that not all of the ...
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1answer
71 views

How to add hypothetical values to a raster?

I have to create Non-Regulatory Products for a few FEMA regions. Right now I am working on the 'Increased Flooding Scenarios' where you add a hypothetical value to the existing Base Flood (1', 2', and ...
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1answer
3k views

Calculating Flooded area / Inundation in ArcGIS for Desktop?

I was tasked to create a layer with the flooded areas if the sea / river level was to go up by X feet. There is no requirement to take Flow and Pour Points into account, just a simple raise in water ...
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1answer
350 views

Extracting features from raster data using ArcGIS Desktop?

I want to extract flood related pixels from my imagery. I calculated mLSWI(Modified Land Surface Water Index). According to the literatures, mLSWI >= 0.5 is flood pixels. How do I identify the ...
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729 views

Flood mapping in QGIS 2.4

I am trying to delineate flood-prone areas using QGIS. I have a vector layer of the river and a DEM of the same area. I have used the GRASS Module to get watershed by using r.watershed and I have ...
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1answer
118 views

Advice on Flood mapping of village area [closed]

This is my first attempt to do a study on this topic. I would like to get some advice on what data are required for doing flood mapping. The area I have selected for this is a village which faces ...
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1answer
1k views

How to extend a (river water level) raster, transfering its values to the added area?

Exploring the raster tools in QGIS and related software, I found raster buffer functions to surround existing rasters. The values of the raster buffer are restricted to be distances from the interior ...
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1answer
371 views

Getting flood depth grid values for road segments?

I have a 2 features, the first contains values for flood depth (Raster, GRID). the other is a road network (vector, polyline) that has been clipped to the boundary of the depth grid. I am racking my ...