Adding reservoir release data

Veronica Koess

unread,

Mar 2, 2026, 12:27:36 PMMar 2

to SWAT+ Editor

Hi everyone,

my watershed comprises two reserviors that i want to include in my SWAT+ model. The objects are already in the model as lake polygons but know, I want to edit the related res_rel.dtl decision tables. The release should be based on observed dam outflow. Therefore I have edited e.g. the pt0040 recall file to timeseries for the reservoir outflow channel cha0009.

Now, i am still struggling to edit the res_rel.dtl in the Editor in the right way. Could you assist me with the correct parameter? Please see the table that I have edited to my best knowledge based on the parameter options explained in the documentation https://swatplus.gitbook.io/io-docs/introduction-1/decision-tables/lum.dtl. I am unsure about setting the conditions that i actually want to avoid at all (as i am using the observed outflow data) ans also with the action type. I would preferably like to put an parameter like "release" together with obj res… I have now set flow_control and left the obj blank as there is no object type listed.

name conds alts acts
res1_release 1 1 1

var obj obj_num lim_var lim_op lim_const alt1
vol res 0 pvol * 1 >

act_typ obj obj_num name option const const2 fp outcome
flow_control res 0 outflow_1 meas - - pt0040.csv y

I would appreciate any help on this.

Best regards

Veronica

Veronica Koess

unread,

Mar 4, 2026, 6:03:14 PMMar 4

to SWAT+ Editor

Just a quick update on this, I have updated the decision table to:

name conds alts acts

res1_release 1 1 1

var obj obj_num lim_var lim_op lim_const alt

vol res 0 null - 0 >

act_typ obj obj_num name option const const2 fp outcome

release res 0 outflow_1 meas - - 1 y

I have added the recall timeseries files for the daily values of the pointsources, of the outflow rivers.

However, opening the Toolbox afterwards is breaking, so I assume there is an error in the model because of changing these reservoir parameters. Is anyone having an idea, what might happen, why the problems occur or how i could find the error?`

Best,

Veronica

pt0353.csv

pt0040.csv

Julia Glenday

unread,

Mar 26, 2026, 8:30:04 PMMar 26

to SWAT+ Editor

Hi!

I am struggling with a similar issue. I have set up the recall timeseries for the point at the outlet of my reservoir in the Point Sources section and I've tried a decision table in the same format as the one in the previous email, but it doesn't seem to be working: when I plot the SWAT+ output for my reservoir it doesn't release anything, just keeps filling forever (flo m3 storage in the reservoir_day.txt just goes up and up and flo_out is 0)

If anyone has working decision table for a measured outflow, please share! Thanks :)

I have tried the following options:

name conds alts acts

res1_release 1 1 1

var obj obj_num lim_var lim_op lim_const alt

vol res 0 null - 0 >

act_typ obj obj_num name option const const2 fp outcome

release res 0 outflow_1 meas - - 1 y

name conds alts acts

res1_release 1 1 1

var obj obj_num lim_var lim_op lim_const alt

vol res 0 null - 0 >

act_typ obj obj_num name option const const2 fp outcome

release res 0 outflow_1 meas - - pt279 y

name conds alts acts

res1_release 1 1 1

var obj obj_num lim_var lim_op lim_const alt

vol res 0 pvol * 0.1 >

act_typ obj obj_num name option const const2 fp outcome

release res 0 outflow_1 meas - - pt279 y

name conds alts acts

res1_release 1 1 1

var obj obj_num lim_var lim_op lim_const alt

vol res 0 null - 0 >

act_typ obj obj_num name option const const2 fp outcome

release res 0 outflow_1 meas 1 1 pt279 y

name conds alts acts

res1_release 1 1 1

var obj obj_num lim_var lim_op lim_const alt

vol res 0 null - 0 >

act_typ obj obj_num name option const const2 fp outcome

release res 0 outflow_1 meas 0 0 pt279 y

Mok Even

unread,

Apr 30, 2026, 5:19:04 AMApr 30

to SWAT+ Editor

Hi Julia,

I have a similar issue. Are you are to solve this?

It could be helpful if you can share right setup. Thank you

Awel Seid

unread,

Apr 30, 2026, 3:39:09 PMApr 30

to SWAT+ Editor

Hi. For a reservoir of measured monthly outflow, and principal volume vol_ps= 339250000 m^3, the following decision table worked for me.
Goodluck!

name conds alts acts
ChelWetl_rels_DT 13 12 12
var obj obj_num lim_var lim_op lim_const alt1 alt2 alt3 alt4 alt5 alt6 alt7 alt8 alt9 alt10 alt11 alt12
mon res 0 null = 1 y n n n n n n n n n n n
mon res 0 null = 2 n y n n n n n n n n n n
mon res 0 null = 3 n n y n n n n n n n n n
mon res 0 null = 4 n n n y n n n n n n n n
mon res 0 null = 5 n n n n y n n n n n n n
mon res 0 null = 6 n n n n n y n n n n n n
mon res 0 null = 7 n n n n n n y n n n n n
mon res 0 null = 8 n n n n n n n y n n n n
mon res 0 null = 9 n n n n n n n n y n n n
mon res 0 null = 10 n n n n n n n n n y n n
mon res 0 null = 11 n n n n n n n n n n y n
mon res 0 null = 12 n n n n n n n n n n n y
vol res 0 null > 339250000 y y y y y y y y y y y y

act_typ obj obj_num name option const const2 fp outcome

release res 0 efc_cont rate 1 0 null y
release res 0 efc_cont rate 1.5 0 null y
release res 0 efc_cont rate 1.8 0 null y
release res 0 efc_cont rate 2 0 null y
release res 0 efc_cont rate 2.3 0 null y
release res 0 efc_cont rate 2.6 0 null y
release res 0 efc_cont rate 3 0 null y
release res 0 efc_cont rate 4 0 null y
release res 0 efc_cont rate 5 0 null y
release res 0 efc_cont rate 3.5 0 null y
release res 0 efc_cont rate 2.5 0 null y
release res 0 efc_cont rate 1.5 0 null y

Julia Glenday

unread,

Apr 30, 2026, 3:39:14 PMApr 30

to Mok Even, SWAT+ Editor

Hi!

I still haven't solved it unfortunately - have asked others and waiting for help. If I do resolve it, I will post here though.

The flow in the stream channel downstream of the reservoir is correct - i.e. the amount specified in the point source file. However I need the reservoir storage to be correct and my goal was for the water quality in the flow downstream of the reservoir to match what was in the reservoir at the time... this was possible in SWAT2012, but I haven't gotten SWAT+ to do the same yet.

All the best,

Julia

----

Julia Glenday

C: +27 (0) 79 507 1449

--
You received this message because you are subscribed to a topic in the Google Groups "SWAT+ Editor" group.
To unsubscribe from this topic, visit https://groups.google.com/d/topic/swatplus-editor/HDFFK-pA6dk/unsubscribe.
To unsubscribe from this group and all its topics, send an email to swatplus-edit...@googlegroups.com.
To view this discussion visit https://groups.google.com/d/msgid/swatplus-editor/36173d18-8bdb-4336-8425-04f69982a9d9n%40googlegroups.com.

ken

unread,

May 18, 2026, 11:11:02 AM (yesterday) May 18

to SWAT+ Editor

Hi everyone!

I have the same issue too.
I tried a few decision tables to input measured reservior outflow,
and the one posted below worked. Hope this helps.

name conds alts acts
release 1 1 1
var obj obj_num lim_var lim_op lim_const alt1
month null 0 null - 0.00000 >

act_typ obj obj_num name option const const2 fp outcome

release res 0 measured_ outflow meas 1.00000 0.00000 pt047 y

Best regards,

ken

2026年5月1日金曜日 4:39:14 UTC+9 Julia Glenday:

Reply all

Reply to author

Forward