Lateral flow equal 0 in SWAT+ rev60.5.2

[Marcel Pereira de Andrade]

Dear all,

I need help!! I don't know why the lateral flow is 0 mm. According to the equation presented in the theoretical material of 2009. The parameters that influence the lateral flow are:
lat_len (Lhill)
k (ksat)
slope (slp)
SW (if SW <= FC, SW = 0)
FC = AWC + WP

I tried to change the parameter values: lat_len, k, slope, awc and latq_co using calibration.cal. But without success.

My stramflow (flow out) is 0 in the dry season (see hydrograph in the appendix). I don't know if I'm right, but could the cause of the problem be the result of the side flow being zero?

Ah!!  This problem does not occur in SWAT+ rev 59.3.

Can anybody help me? Don't know what to try anymore
My TxtInOut is in the appendix.

Best regards,

Marcel

[Alexander N.]

Hello Marcel,

a quick question in advance: Is there lateral flow to be expected? What is the terrain of your catchment area?

Best regards

Alex

[Alexander N.]

But concerning the streamflow graph: I don't think that lateral flow is the problem in your case (except you have the according geomporphological situation). You definately have to adjust your curve number values (CN2) and some of your groundwater parameters (a "blind guess" would be rchg_dp, deep_wt/deep_bot, flo_min and maybe bf_max, spec_yld, revap/revap_min -all to be found in aquifer.aqu) as well. After adjusting the baseflow and peak flow, you may look at parameters which affect the lateral flow (again, if lateral flow is to be expected in you catchment).

[Max Brunke]

Hi Marcel!

I am facing the same problem as you right now! (high peaks; baseflow way to low)
Did you succeed in gettig a higher baseflow and lower peaks?
What were the specific calibration parameters that you used?

Best Max

[Mwangi Gathenya]

I had the same problem, in my case I found that changing Ksat in one of my soils had a big impact 

John M. Gathenya, PhD
Professor, Hydrology, Climate Services, Environmental Services
Jomo Kenyatta University of Agriculture & Technology,
School of Biosystems and Environmental Engineering
P. O. Box 62000 - 00200
Nairobi, Kenya

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[Max Brunke]

Thanks for the recommendation, I will try this as well!

Is your chart showing overall outflow? Or just percolation or something else?
Problem is, my waterbalence looks quite good already. 

If your graphic is showing outflow, then Ksat isnt just lowering the peaks by redistributing runoff but causes overall lower outflow.

Am I getting it right?

Best Max

[Marcel Pereira de Andrade]

Hello Max Brunke!

Sorry for the delay.  In my case the main problem was outflow equal zero. This problem only occurred when migrate to rev 60.5. Well to reduce peaks try reduce CN value.

[Max Brunke]

Hi Marcel, 

thanks for coming back at me! 
LatQ as well as percolation are extremely low in my model (<1% and <11% of precipitation).

Though i think they are highly underestimated, they are not "0".

CN isn't affecting runoff that much ..

Best, Max B