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FAQ/ What is Watershed Analysis?

Does "watershed analysis" in DioVISTA mean creating a watershed line?


Yes that's right.

Watershed analysis is also known as watershed delineation.

The waterfall line is the creation of a "hydrologically correct" topography by removing depressions from ordinary topographic data, and connecting the steepest gradient direction with the flow direction. DioVISTA uses technologies such as Patent 5337995 to search for watersheds in the upstream direction by simply specifying a river by the user.

Figure: Example of a waterfall line created in DioVISTA

However, in DioVISTA, watershed analysis is performed only when the user chooses to use the spillover model. The setting is[rainfall] to change [Rainfall Scenarios] the > [property] of [Watershed analysis] or [True] to .

Therefore, whenever a watershed analysis is performed, it is simulated with a spillover model. [Start Simulation] In the dialog, if you check , the distributed runoff model proposed by [Use a three-tier model] the runoff model that takes into account saturated and unsaturated flows (Tachikawa et al., 2004 (Reference 20)) is applied. Otherwise, a distributed spill model based on the kinematic wave model is applied.

For details, see Technical Reference / Spill Model / Parameter Setting Method.

Last update: 2023-03-20