Creating a Gridded Precipitation for a 2D Mesh

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Creating a Gridded Precipitation for a 2D Mesh

Chris Naidu
Hey Chris, I know that that precipitation can be added as a time series hydrograph or read from a DSS file. Is there a way to use gridded precipitation so that the 'rain' falls uniformly over the entire 2D mesh as opposed to a point discharge at a certain boundary condition?
Thank you
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Re: Creating a Gridded Precipitation for a 2D Mesh

Lonnie A
In the flow editor window as the 2D flow area as a boundary and then assign precip to it. It will distribute the rainfall uniformly over the 2D mesh
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Re: Creating a Gridded Precipitation for a 2D Mesh

Chris Naidu
Hey Lonnie, thanks for your input. I'll give it a go!
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Re: Creating a Gridded Precipitation for a 2D Mesh

Vimal Chandra Sarma@IIT Hyderabad
In reply to this post by Lonnie A
Dear Lonnie A,

I am also looking for this solution. Is there any article or document which gives an explanation about the rainfall distribution in hecras 2D. Because when i am looking in user manuals, no where explained about Precipitation as a boundary condition (not in detail). Kindly please update me with the explanation.

Thanks&Regards
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Re: Creating a Gridded Precipitation for a 2D Mesh

Mohsin
In reply to this post by Chris Naidu
I need some help regarding adding the precipitation in the HEC-RAS. The constant inflow hydrographs are provided as input for the 2D domain, now the precipitation also needs to be added over the whole 2D domain. The precipitation data consisted of the single value like return period with intensity.

1- In order to add 100-year return period value of 1-hr duration (intensity) is 30mm, How we can add it?


2- What does the actual mean of time series of precipitation? Is it mean the accumulated rainfall?
for example

Date                                 Simulation time                             Precipitation (mm)
11-01-2019 07:00                   00:00                                               30
11-01-2019 08:00                   01:00                                               30
11-01-2019 09:00                   02:00                                               30

Does it mean the total rainfall added on the 2D flow area during the whole simulation time is 90 mm? Please elaborate?

3- If we just want to add 30mm in total for the whole simulation time of three hours (as above), then is it a right approach?

Date                                 Simulation time                             Precipitation (mm)
11-01-2019 07:00                   00:00                                               10
11-01-2019 08:00                   01:00                                               10
11-01-2019 09:00                   02:00                                               10


Thanks