Re: [udig-users] JGRASS - peakflow hyetograph question

[Silvia Franceschi <silvia.franceschi@xxxxxxxxx>]

Ciao Matteo,
good to hear that Peakflow works well.
I am not sure about the format of the rainfall file for your version of the model, anyway you already did a simulation so I assume it is not a question of format but of contents. In the rainfall file you have to consider the mm of rain in each interval.
The interval has to be constant and it will be calculated as the difference between the first timestamp and the second of your rainfall file, you can choose the timestep you prefer based on the basin extension and the rainfall duration.

Hope this helps

Silvia



On 11/18/2011 12:32 PM, Matteo Paternolli wrote:

Hallo,

 

I'm doing an hydrological model using the function Peakflow running with the software Jgrass (version 1.0.6) and uDig 1.2-M9.

The model operates using the coefficients a and n from the rainfall depth-duration curves. The comparison of the results with an other model is quite good.

If I try to give as input a different hyetograph (with alternated blocks, but with same total rain as the other case) the maximum flow rate is 1/5 of the other case.

I think, there is a problem with the input file. How should be the stucture of the input hyetograph file? Should I write the mm of water or the intensity? How wide should be the intervals of the rain data?

Can someone send me an example of the input rain file?

Thank you,

 

Matteo Paternolli

 

 

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