Episode 20: Urban Flood Modeling in HEC-RAS 2D

[@wellmanlake]

Podcast!! Yes!!!!! Great hearing for my commute. About air travel grievances... to be diverted to another airport... bummer...

[@AbidAli-bv2gl]

Excellent video, HEC-RAS has ML and AI application. Please let me know. Do you have Infoworks ICM

[@fcernst]

Yes, I would like to see a follow up to this as I am doing a lot of this now in a large Metro study area. Love to see a follow up discussing 6.2 and how you would do Urban modeling differently perhaps now..

[@a0960782670]

43:25 It will be made into a video in the future ? I'm really looking forward . Thank yoo .

[@bharadwajak5985]

Great! I have done something similar to simulate 2D overland flow of water from flooding MH. I wrote a script to add all the flooding MH as internal BC ,gave a triangular hydrograph to each BC and simulated it. It worked pretty well. I have always thought of building a loosely coupled HECRAS 1D-2D and SWMM 1D to create a 3way coupled flood model, but it is still on my head as thoughts.

[@gopalmahadev4940]

@Bharadwaj, can you share the script, I'm interested.

[@santicata89]

thanks for the huge amount of key tips. I wonder why travel time is not accounted for inside the storm sewer culverts, if Hec Ras is supposed to model the flow profile inside them? a time lagged operational rule for the gate at the entrance would help?

[@TheRASSolution]

This should be fixed in the stormwater modeling feature in version 6.6/6.7

[@zainabbutt3726]

just wanted to ask do we have to import subbasins which were generated in hechms, in hecras and then do we need to define boundary condition for each subbasin separately or do we have to create a single 2d flow area perimeter for all the subbasins as whole, for 2D flood modeling? as we'll be using outputs from hechms which were generated for each subbasin

[@santicata89]

I would like to suggest SUDs for any of your next session please.

[@TheRASSolution]

Hey! What is an SUD?

[@suseendar]

I am trying to build a urban flood simulation in HEC RAS , but I am unable to get the model run stable in full momentum , I am using 1 sec time step controlled by courant number , my average cell size is 10 m and minimum is 1 m. Can you suggest some way to get my model complete the run in full momentum ?

[@besirhuseynli4279]

Hello dear members, Can someone help me please. So before running the model when I go to change the equation and click okay. All the deafault values are set to zero and when I compute it say some tolerance values are aout of interval. How can I change the equation and simply run the model. Thanks in advance

[@salpiseyheng6089]

Dear Sir, do you draw boundary of 2D Flow area base on boundary of urban area or topography? Thank you

[@TheRASSolution]

I always draw my 2D boundary based on topography.

[@salpiseyheng6089]

@@TheRASSolution how you draw it based on topography?

[@salpiseyheng6089]

@@TheRASSolution you delineate watershed for 2d flow boundary?

[@zn9114]

Hello sir, Is there a way to coupling Hec RAS and SWMM ?

[@TheRASSolution]

There is! HEC-RTS

[@hendrasumarja5172]

Amazing