forrtl: error (72): floating overflow
Yuxiang Ren
1. Primary Issue Location
Component: SWAT+ Editor
Area of impact: run model
2. Software Versions
QGIS Interface: 3.44.12* SWAT+ Editor:3.2.4 * SWAT+ Revision:61.0.2
4. Description of Issue
forrtl: error (72): floating overflow
Image PC Routine Line Source
libmmd.dll 00007FFDC06F1F95 __libm_expf_e7 190 expf_ct.c
swatplus-61.0.2-i 00007FF7EBDD2F55 CLI_RHGEN 60 cli_rhgen.f90
swatplus-61.0.2-i 00007FF7EBDDC9FA CLIMATE_CONTROL 139 climate_control.f90
swatplus-61.0.2-i 00007FF7EC13A603 TIME_CONTROL 214 time_control.f90
swatplus-61.0.2-i 00007FF7EBFEDBA7 MAIN 129 main.f90
swatplus-61.0.2-i 00007FF7EC15D6FB Unknown Unknown Unknown
swatplus-61.0.2-i 00007FF7EC165C60 Unknown Unknown Unknown
KERNEL32.DLL 00007FFEA9CC259D Unknown Unknown Unknown
ntdll.dll 00007FFEAAA8AFB8 Unknown Unknown Unknown
The meteorological dataset covers the period from 2000 to the end of 2024 and contains daily precipitation and daily maximum and minimum temperatures. Some daily records contain missing values coded as -99.
Using the Hargreaves method, the model runs successfully when the simulation period is set to either:
January 2000 to March 2023, or
May 2023 to the end of 2024.
However, the model fails whenever April 2023 is included in the simulation period.
I checked the meteorological data for April 2023 and found no more than three consecutive missing values (-99). Missing values also occur during the earlier period from 2000 to 2022, but they do not cause the model to fail.
What could be causing this error? What should I check or modify so that April 2023 can be included in the simulation?
Nancy B. Sammons
This appears to be a problem when the model is generating the values. I would need to take a look at your weather generator data. Please send me the contents of your current txtinout folder.
From: swatplu...@googlegroups.com <swatplu...@googlegroups.com>
On Behalf Of Yuxiang Ren
Sent: Monday, July 20, 2026 11:28 AM
To: SWAT+ Editor <swatplu...@googlegroups.com>
Subject: [SWAT+ Editor User Group] forrtl: error (72): floating overflow
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Yuxiang Ren
Thank you for your help! This is the link to my TxtInOut folder on the Google Drive：https://drive.google.com/file/d/1VCg_zCeU0cFBTW5ZjW2SHmaUlL1ocBAg/view?usp=drive_link
This version successfully ran for the period from 2020 to 2022. The input weather data cover the period from 2000 to December 31, 2024, but the model returns an error whenever the simulation includes the year 2023.
Thank you again for your help!
Nancy B. Sammons
Yuxiang:
I will try and explain the problem.
On day 94 (year 2003-daily humidity file), the model has read a code to generate (-99.00) the value. The model then uses the monthly data in the ‘weather-wgn.cli’ file. The DEW_AVE is out of range for the month of April and causing the problem in the model. I was able to get a successful simulation after changing these values to a reasonable number. I have included a table that highlights this along with some other inputs that appear out of range that should be reviewed.
Let me know if you do not get a successful simulation after making these changes and I will send you an updated version of the model. You are currently using a model from 8/2024.
Nancy
1_HMD.hmd file (partial file):
2023 93 0.41800
2023 94 -99.00000
2023 95 0.43800
2023 96 0.33700
2023 97 0.29100
From: swatplu...@googlegroups.com <swatplu...@googlegroups.com>
On Behalf Of Yuxiang Ren
Sent: Tuesday, July 28, 2026 3:32 AM
To: SWAT+ Editor <swatplu...@googlegroups.com>
Subject: Re: [SWAT+ Editor User Group] forrtl: error (72): floating overflow
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You don't often get email from yuxian...@gmail.com. Learn why this is important |
Thank you for your help! This is the link to my TxtInOut folder on the Google Drive：https://drive.google.com/file/d/1VCg_zCeU0cFBTW5ZjW2SHmaUlL1ocBAg/view?usp=drive_link
This version successfully ran for the period from 2020 to 2022. The input weather data cover the period from 2000 to December 31, 2024, but the model returns an error whenever the simulation includes the year 2023.
Thank you again for your help!
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