Subject: Snow Hydrology and PEST Calibration Posted: 6/26/2018 Viewed: 7410 times
when entering the expression
"If(PrevTSValue(Snow Depth[m])=0, Albedo Lower Bound,
PrevTSValue(Snow Depth[m],1)>PrevTSValue(Snow Depth[m],2),
why is always appear "Expression refers to an invalid branch/variable combination"?
I have WEAP version 2017.
Mr. Jack Sieber
Subject: Re: Snow Hydrology and PEST Calibration Posted: 6/27/2018 Viewed: 7394 times
I am not sure why you are getting an error for that expression. I just tried it and had no problem.
I strongly encourage you to install the latest version of WEAP (2018.01). It has many new features and several bugs have been fixed. It might help your problem.
Ms. Kristen Bigland
Subject: Re: Snow Hydrology and PEST Calibration Posted: 8/31/2019 Viewed: 5947 times
Hi Yiran - I am having the same issue as you! I am using WEAP 2019.2.
I think I found the issue - page 205 of the tutorial says "Go to the Albedo data tab. Using the Expression Builder to make an expression. Enter the equation:.....". I read this as to a direction to select Albedo under Key Assumptions and boy, was that wrong. It is really referring to the Albedo data tab go the Climate section of the Snowy Mountain Demand Site. When you select Expression Builder on this tab, it's all good!
Hopefully this helps someone, because it had me stumped for at least an hour!