Units in the reservoir output files

[Lorenzo Villani]

Dear SWAT+ users, 

We are working with reservoirs and we got confused when we tried to analyse the outputs in the reservoir_** files.

The units for precipitation, evaporation and seepage should be ha-m, while those for the flo_sto, flo_in and flo_out are m^3. 

We noticed that the values for the variables expressed in ha-m are very high, and when we tried to calculate the water balance of the reservoirs it closed if we considered them as m^3.

In the figure below there is the water balance calculated for the monthly outputs as:

precip + flo_stor (in the previous month) + flo_in - evap - seep - flo_out

that is equal to the flo_stor in that month

Is it correct to assume that the values for precipitation, evaporation and seepage are in m^3? or are we missing something?

We are using the version 60.5.4, thank you for your help!

Kind regards, 

Lorenzo

[Henrike Vogelsang]

Hi Lorenzo, 

I agree: I think that (at least seepage) is in m3 in the output. I set a value for the seepage at the reservoir bottom and only if I use the output in m3 it matches with my initial value. This is yet to be confirmed by someone official though. 

Good luck with your research!

Henrike 

[Natalja C.]

Hello,

Although I am not "someone official", but we will have a look at the headers for the res output files. They are misleading and need a bit of "clean-up". It will probably be right in the next release (if not yet done).

Natalja 

[Nancy B. Sammons]

Dear All:   

We apologize for the confusion with the headers for PRECIP/EVAP and SEEP in the reservoir output files, which are all M^3.  This change will be made in the next release of the model/interfaces.

Thank you for bringing this to our attention.

Nancy

 

 

From: swat...@googlegroups.com <swat...@googlegroups.com> On Behalf Of Natalja C.
Sent: Thursday, December 1, 2022 9:07 AM
To: SWAT+ <swat...@googlegroups.com>
Subject: [SWAT+ User Group] Re: Units in the reservoir output files

 

Hello,

Although I am not "someone official", but we will have a look at the headers for the res output files. They are misleading and need a bit of "clean-up". It will probably be right in the next release (if not yet done).

Natalja 

On Wednesday, 30 November 2022 at 09:10:16 UTC-6 henrike....@icloud.com wrote:

Hi Lorenzo, 

 

I agree: I think that (at least seepage) is in m3 in the output. I set a value for the seepage at the reservoir bottom and only if I use the output in m3 it matches with my initial value. This is yet to be confirmed by someone official though. 

 

Good luck with your research!

Henrike 

 

lorenzo...@unifi.it schrieb am Dienstag, 22. November 2022 um 07:40:16 UTC-5:

Dear SWAT+ users, 

We are working with reservoirs and we got confused when we tried to analyse the outputs in the reservoir_** files.

The units for precipitation, evaporation and seepage should be ha-m, while those for the flo_sto, flo_in and flo_out are m^3. 

We noticed that the values for the variables expressed in ha-m are very high, and when we tried to calculate the water balance of the reservoirs it closed if we considered them as m^3.

In the figure below there is the water balance calculated for the monthly outputs as:

 

precip + flo_stor (in the previous month) + flo_in - evap - seep - flo_out

 

that is equal to the flo_stor in that month

 

 

Is it correct to assume that the values for precipitation, evaporation and seepage are in m^3? or are we missing something?

 

We are using the version 60.5.4, thank you for your help!

 

Kind regards, 

Lorenzo

 

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