Groundwater Modelling Advice: Difference between revisions
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Since the 2025.2.0 release, TUFLOW supports connecting the 1D domain (either ESTRY or SWMM) to 2D groundwater layers. This enables users to model features such as detention basins with subsurface drainage or other green infrastructure directly within a TUFLOW model and represent groundwater and surface water impacts. The physical infrastructure collecting the groundwater varies, but is typically a perforated or slotted pipe in loose fill such as gravel or sand.
The discharge through the connection is typically modeled using a depth vs discharge curve where the depth applied is the pressure in the groundwater at the location of the connection. This relationship is often defined using the orifice equation where the orifice coefficient depends on the configuration. This section below contains guidance for generating a curve based on the orifice equation.
== Depth vs Discharge Curves ==
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[[File: orifice_equation.png]]<br>
Where:
*'''''C<sub>d</sub>A''''' is the
:*'''''
:*'''''A''''' is the cross-sectional area of the orifice
*'''''H<sub>up</sub>''''' is the upstream water level
*'''''H<sub>down</sub>''''' is the higher of the downstream obvert or downstream water level<br>
The following link provides some guidance on how to select the orifice coefficient: https://wiki.sustainabletechnologies.ca/wiki/Flow_through_perforated_pipe
=== Python ===
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