Subject: Accounting for attenuation in routed flow in WEAP at a weekly time step Posted: 2/23/2018 Viewed: 3594 times
We are implementing WEAP for water resources management and planning in a relatively large catchment. The natural flow is being imported to WEAP from another hydrological model. Previous setups for the catchment in a separate water resources management model at a weekly time step have accounted for attenuation by implementing a time lag in flow. We think that we will need to implement something similar in WEAP if that is possible? I know that WEAP does not provide the functionality for this automatically, but is there a way to build it in, even if it is relatively simplistic?
Ms. Stephanie Galaitsi
Subject: Re: Accounting for attenuation in routed flow in WEAP at a weekly time step Posted: 4/16/2018 Viewed: 3582 times
WEAP makes all the calculations based on the length of the timestep that you have selected. So a river flowing through two demand sites (for example) provides water to both of their demands in a month, and the resulting flow at the end of the river is the flow for that month in that reach.
Usually we deal with the timing of the water flow by adjusting the size of the model. Basically, a monthly-time step model should be large enough that water travels through the entirety on the modeled area in roughly 1 month. A weekly time step would be considerably smaller in terms of area, or rather distance that water must travel in the time step.
Topic "Accounting for attenuation in routed flow in WEAP at a weekly time step"