AGNPS question

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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G e o D a t a P l a n
Geoinformatics, IT-Consulting, GIS-aided planning
Andreas Paukner-Ruzicka, Gartenstr. 2,
D-82380 Peissenberg, Germany
Tel: +49-08803-630317, Fax: +49-08803-630318
eMail: gdp.geoinformatik@t-online.de
Homepage: http://home.t-online.de/home/gdp.geoinformatik
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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

*************************************************************
G e o D a t a P l a n
Geoinformatics, IT-Consulting, GIS-aided planning
Andreas Paukner-Ruzicka, Gartenstr. 2,
D-82380 Peissenberg, Germany
Tel: +49-08803-630317, Fax: +49-08803-630318
eMail: gdp.geoinformatik@t-online.de
Homepage: http://home.t-online.de/home/gdp.geoinformatik
*************************************************************

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
Senckenbergstr. 3 priv.: Grabenstr. 14
D-35390 Giessen 35396 Giessen
Tel.: 0641/99 37384 Tel.: 0641/54470
Fax.: 0641/99 37389
e-mail: Stephan.Haverkamp@agrar.uni-giessen.de
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