Walkthrough 2: DOWNSTREAM_ID Help
Posted: Fri Mar 26, 2021 4:42 pm
New user to Raven - apologies if this is a silly question!
In my Raven_errors.txt file I consistently get the following errors:
ADVISORY : CModel::InitializeBasinFlows: one or more subbasin reference discharges were autogenerated from annual average runoff
ADVISORY : CModel::InitializeBasinFlows: one or more subbasin initial outflows were autogenerated from annual average runoff
I'm wondering if this could be related to the values I provided for the subbasin DOWNSTREAM_IDs.
The Walkthrough 2 Manual states:
"Modify the Nith.rvh file from a text editor after gathering the input files. From the map above, specify the proper subbasin outlet IDs; note that the most downstream subbasin (subbasin 43, which empties outside the modeled domain) should be assigned a DOWNSTREAM_ID of -1. Just to test Raven’s errorchecking skills, first temporarily set this ID to 36, and attempt to run the model – note that
RavenErrors.txt should reflect that there was a circular reference, since 36 empties into 39 empties backinto subbasin 43. Raven requires that the stream network is a branching network, and all flows are noncyclical. Change the outflow index back to ‐1 and re‐run the model, then click Gather Output to examine the output files."
My question is, what value should subbasins 30, 36, and 39 have? And what about the basin names.
Here is an example of my Nith.rvh file at the moment:
:SubBasins
:Attributes NAME DOWNSTREAM_ID PROFILE REACH_LENGTH GAUGED
:Units none none none km none
30 Sub30 -1 sub30profile 0 0
36 Sub36 -1 sub36profile 37.0 1
39 Sub39 -1 sub39profile 42.7 0
43 Sub43 -1 sub43profile 35.4 1
:EndSubBasins
Any help would be much appreciated!
In my Raven_errors.txt file I consistently get the following errors:
ADVISORY : CModel::InitializeBasinFlows: one or more subbasin reference discharges were autogenerated from annual average runoff
ADVISORY : CModel::InitializeBasinFlows: one or more subbasin initial outflows were autogenerated from annual average runoff
I'm wondering if this could be related to the values I provided for the subbasin DOWNSTREAM_IDs.
The Walkthrough 2 Manual states:
"Modify the Nith.rvh file from a text editor after gathering the input files. From the map above, specify the proper subbasin outlet IDs; note that the most downstream subbasin (subbasin 43, which empties outside the modeled domain) should be assigned a DOWNSTREAM_ID of -1. Just to test Raven’s errorchecking skills, first temporarily set this ID to 36, and attempt to run the model – note that
RavenErrors.txt should reflect that there was a circular reference, since 36 empties into 39 empties backinto subbasin 43. Raven requires that the stream network is a branching network, and all flows are noncyclical. Change the outflow index back to ‐1 and re‐run the model, then click Gather Output to examine the output files."
My question is, what value should subbasins 30, 36, and 39 have? And what about the basin names.
Here is an example of my Nith.rvh file at the moment:
:SubBasins
:Attributes NAME DOWNSTREAM_ID PROFILE REACH_LENGTH GAUGED
:Units none none none km none
30 Sub30 -1 sub30profile 0 0
36 Sub36 -1 sub36profile 37.0 1
39 Sub39 -1 sub39profile 42.7 0
43 Sub43 -1 sub43profile 35.4 1
:EndSubBasins
Any help would be much appreciated!