How to Perform Hydrology Analysis and Flood Risk Mapping in ArcGIS? A Complete Tutorial.

By: Dr. Abe Mollalo
00:00 Purpose of the lab
01:09 Load DEM/Slope, Landcover, and precipitation data
07:41 Hillshade/shaded relief map
10:39 Hydrology Analysis (Fill, Flow Direction, Flow Accumulation, Extract Streams)
24:28 Proximity to streams
26:07 Reclassify all criteria (rate/score all layers)
36:17 Generate Flood Risk Map: Combine layers based on given weights

Site selection in GIS (Raster overlay)

Download the data used in this video tutorial:

[voglbdw]

Amazing! Very clear and workable, Thank you ❤

[mharckus]

Wonderful presentation. Very useful and detailed. Kudos

[DK-wzsl]

I really like how clear the explanation is in this video, finally i get it after multiple tries. Thanks fam !

[kainoakester]

Thank you so much for this great tutorial!

[mohamedghazy]

bro you made others seems like amateurs ..excellent work!

[iandownes]

This helped me fix an issue I had. Thank you! I know I was doing something wrong stepwise

[getfanmedia]

"This is what I like to see."

[ximehz]

Hi! Thanks for the explanation, it was very clear so I could apply it to my own work.
I wanted to point out something though, when you reclassify the DEM from 2 - 10, you are assigning the value 10 to "flat areas", but isn't the DEM about topographic altitudes? Shouldn't you consider lower numbers as lower altitudes, and not as flat areas (isn't that why you have the slope there)? I say this because in my area, for example, I have the flat areas in higher altitudes (plains) and they can't get flooded even if they are flat, so I had to modify things a bit to get a more accurate end result (according to my area, of course).
Anyways, thank you so much for explaining your process in such a detail way, it was really helpful!

[Valivetirambabu]

How can we calculate the flood water depth
Is it possible to do it in ArcGIS or do we need HecRas or any other tools ?
Is it possible with the open-source data

[jumaimuhammed]

Hello, please can i use euclidean distance to locate states in my country that are susceptible to flooding when a particular dam in a neighbouring country is opened?

[noobgaming]

thank u so much. like this video, i am doing same process but while fill up hill shade, error has been shown. can u give me a idea

[Mike_more]

thank u so much
please where can I download required Data for this analysis

[daben]

How did your pre layer go from stretch symbology to unique values after you clipped it?

[kennethvertudazo]

Thank you so much, is your PowerPoint presentation downloadable? 😅

[geoempowerinitiative]

Thanks for the great tutorials. Can you please share any reference that supports the factors used to create the map just in case it needs to be used for research purpose? Thank you.

[kentsacendoncillo]

where can i see the tutorial on getting the DEM/Slope data?

[pebruiseruk]

Excellent tutorial. Do you have a reference I can cite for the weights chosen? Or can you recommend peer reviewed papers that offer some guidance for weighting? I would like to cite in a report. Thanks.

[tuesdaygood]

I was working on GeoHECRAS and this helped a lot. Special thanks for sharing the timestamps; they helped me get to the part that directly.

[hysqjlw]

hello, can you tell me if you Know the application of ESTIMATION OF INSTANT HYDROGRAPH UNIT WITH CLARK TECHNIQUE IN GIS;

[mohammeda]

That is just amazing work! if you allow me, from where you got the Landcover layer?