How to increase baseflow? Please!!!

[Tue Nguyen]

Dear Swat users and all,

I did manual calibrated for my SWAT project and I have a question. My question is what are the parameters that need to be adjusted to increase baseflow. The output show that the simulated flow follows observed pattern but under predicted peak flows all the time. I have tried to change some parameters such as CN2, CH_K2, Alpha_Bf but baseflow did not increase.
Anybody help me soon?
Please the chart in the attached.

Thank you.
Micno

[Jim Almendinger]

You've got a water-balance problem, since both high flows and low flows are under-predicted.  Check your RCHRG_DP (loss of water to deep recharge), and change it to zero -- I just noticed yesterday that the default appears to be 0.05.  Make sure your  channel K values (CH_K2 as you noted) are zero, to stop loss of water there.  If you've got ponds, wetlands, or reservoirs, set their K values to zero.  Experiment with different PET methods -- one might give you lower values, resulting in a greater water yield.  

    If you're lucky, you hit on the right combination to raise both your high and low flows...  

-- Jim

Dr. James E. Almendinger, Senior Scientist
St. Croix Watershed Research Station
Science Museum of Minnesota
16910  152nd St. N
Marine on St. Croix, MN  55047
tel: 651-433-5953 X 19
fax: 651-433-5924
email: din...@smm.org
web: www.smm.org/SCWRS/

[lei qiao]

Or the ET flux are too large, maybe you can change PET method to ballance the water budget.

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QIAO Lei (Charlie)
3642 Lindell BLVD
Earth and Atmospheric sciences
Saint Louis University
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[Katie Price]

That's a good point.  I have had much better luck matching baseflows using the Hargreaves ET method than Penman-Monteith (which is default). 

[Jonathan Mota]

Hi Micno,

The simulated flow pattern is very good, the problem is that the groundwater flow (Qgw) is not conserved after the floods. As Q_gw is heavily dependent on its own value in a previous time step ("A Memory"), even more than the shallow aquifer recharge (Wrchrg,sh). I suggest you to reduce further Alpha_bf.

Jonathan Mota. PhD Candidate

Laboratory Biosphere Atmosphere (LCB)
Institute of Astronomy, Geophysics and Atmospheric Sciences - IAG
University of São Paulo - USP

2011/9/15 Tue Nguyen <tues...@gmail.com>

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[vincentyang2006]

Try the GW_Delay! it should be helpful.

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