AGNPS question

[Stephan Haverkamp]

On Fri, 6 Nov 1998, Andreas Paukner-Ruzicka wrote:

> Hello GRASS-Users !
> I want to use the AGNPS-model interface from GRASS but I don't know which units
> the k coefficient has (mm/d ?), which is needed to compute the amount of runoff.
> 
> Does anybody know ?
> 
> Many Thanks in advance !
> 
> Andreas Paukner-Ruzicka
> 
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> 

Dear Andreas,
I do not know about the special details of your GRASS-Interface, because 
for my diploma thesis I used a "self-made" interface for AGNPS vers. 4.03,
which also included the "K"-coefficient.

The equation used by AGNPS was:

                       3600* K-coeff.* RunoffVolAbove*DrainageAreaAbove
Time to peak top[sec]=-------------------------------------------------
                       640*RunoffFlowAbove 

In this equation the K-coeff. is without a unit and discribes the relation
of runoff volume between the time before and after peakflow discharge. The
K-coeff. is developed by the SCS and the default value is 484, which
discribes a unit hydrograph  that has 3/8 of its area prior to peakflow.  


Best wishes,
Stephan


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Stephan Haverkamp
Institut für Landeskultur          
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e-mail: Stephan.Haverkamp at agrar.uni-giessen.de
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