Sub-day (hourly simulation) simulation issue
Abdul baqi Ahady
is there someone who has already ran hourly streamflow simulation with SWAT+ and willing to help?
What i modified:
- Hourly timestep works (tstep 1‑24 in output file)
- time.sim has STEP = 24
- codes.bsn has EVENT = 1 (for Green & Ampt)
- print.prt has interval = 1 and hourly column
- I am not sure about the input climate data, whether they are in acceptable sub-day format for SWAT+ or not? (I have attached precipitation and temperature here).
- When I check pcp1.pcp, precipitation values for a known event (e.g., Jan 6, 2013, 24 mm) are present. However, the simulated discharge shows no peak; only a flat or declining line. It seems SWAT+ is either not reading my precipitation file or is overriding it with synthetic data.
- How can I force SWAT+ to read only my observed climate files (e.g., pcp1.pcp etc) files and completely disable any internal weather generation? Is there any hidden setting or file that still points to a weather generator? Could there be an issue with the format of weather-sta.cli or file.cio that I am missing?
Any help would be greatly appreciated.
Best regards,
Ahady
Yilak Taye
Thank you for your request and for your interest.
Unfortunately, I am not reaching the stages that you had reached. I
apologize for any inconvenience this may cause.
Best regards,
Yilak Taye Bihon
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Nancy B. Sammons
If you send me your current txtinout, I can debug to ensure the subdaily weather is being read correctly.
-----Original Message-----
From: swat...@googlegroups.com <swat...@googlegroups.com> On Behalf Of Yilak Taye
Sent: Friday, May 22, 2026 12:11 PM
To: Abdul baqi Ahady <baqi....@gmail.com>
Cc: SWAT+ <swat...@googlegroups.com>
Subject: Re: [SWAT+ User Group] Sub-day (hourly simulation) simulation issue
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Nancy B. Sammons
Abdul:
I have attached a sample hourly precipitation file. The model reads the following from this file (line #4); it is free format and will need at least one blank between the fields.
2021 year
152 step (julian day)
6 month
1 day of mo
1 hour (1—24)
0.00 pcp amount
sub_hourly pcp file
nbyr tstep lat lon elev
5 24 51.847 8.841 61.553
2021 152 6 1 1 0.00
2021 152 6 1 2 0.00
2021 152 6 1 3 0.00
2021 152 6 1 4 0.00
2021 152 6 1 5 0.00
2021 152 6 1 6 0.00
2021 152 6 1 7 0.00
2021 152 6 1 8 0.00
2021 152 6 1 9 0.00
2021 152 6 1 10 0.00
2021 152 6 1 11 0.00
2021 152 6 1 12 0.00
2021 152 6 1 13 0.00
2021 152 6 1 14 0.00
2021 152 6 1 15 0.00
2021 152 6 1 16 0.00
2021 152 6 1 17 0.00
2021 152 6 1 18 0.00
2021 152 6 1 19 0.00
2021 152 6 1 20 0.00
2021 152 6 1 21 0.00
2021 152 6 1 22 0.00
2021 152 6 1 23 0.00
2021 152 6 1 0 0.00
2021 153 6 2 1 0.00
Let me know if you have any questions.
Nancy
From: swat...@googlegroups.com <swat...@googlegroups.com>
On Behalf Of Abdul baqi Ahady
Sent: Tuesday, May 19, 2026 8:08 AM
To: SWAT+ <swat...@googlegroups.com>
Subject: [SWAT+ User Group] Sub-day (hourly simulation) simulation issue
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