Subject: Loss to groundwater Posted: 7/31/2013 Viewed: 14578 times
please help me!
i have a Reservoir but i do not have any report about loss to groundwater of it. now i want to do expression builder to calculate the amount of loss to groundwater ( the figure = 1.5% of total capacity of reservoir each month)
I do not know, I have to use what structure.
How I can do it?
Subject: Re: Loss to groundwater Posted: 7/31/2013 Viewed: 14576 times
If you want 1.5% of the current storage of the reservoir to be lost to groundwater each month, here is the expression you would use for the "Loss to Groundwater" variable for the reservoir:
PrevTSValue(Storage Volume[Million m^3]) * 1.5%
This will take the storage volume from the end of the previous timestep (which is the storage at the beginning of the current timestep) and multiply it by 1.5%.