This can be done by selecting the Model Statistics tool from the top toolbar (see below). Once the user is viewing the Age of Water option (see Step 6) they may want to generate a time series of the average age of water for the whole model or some selected area. Step 7: Post Processing: Generate Time Series of Mass Weighted Age
The user can generate animations, longitudinal profiles, vertical profiles, etc. Go to ViewPlan and select the Water by Layer option, then select the Other | Age sub-option. The same approach would be used for pressure or withdrawal/return. The following is an example of the flow boundary type. To do this the user should set all boundary condition dye concentrations and/or series to 0. The standard approach is to assume that all incoming water to the model domain has an age of zero days, i.e. The result is the dye constituent represents the age of water in days. At the end of the dye transport the water is "aged" by adding the delta-T in days, to the dye constituent. Every timestep the dye constituent is transported in a method similar to all other water column constituents. Selecting the Age radial button option effectively treats the dye constituent as an age counter. Step 2: Assign the Age of Water Flag to the Dye Decay Rate Step 1: Turn on the Activate Dye computations in Active Modules AGE) in days output in the water column for each snapshot. So, at the end of the advection and diffusion step the source term is added for the time step resulting in:
Q c represents the source term for age, at all active cells for each time step The transport equation for the AGE constituent having an "age" (equivalent to a "mass") per unit volume C, is: The age of water approach uses the DYE constituent, referred to as "age" in days. The theory behind the function and a step-by-by approach for how to use this feature is provide below. This function uses the dye sub-model for simulation. The EFDC_DSI/EFDC_Explorer system has the ability to easily compute a residence time or "Age of Water".
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