Outlet

The Outlet lets water flow downstream with a prescribed flow rate. It is similar to the Pump, except that water only flows down, by gravity.

When PID controlled, the Outlet must point towards the controlled Basin in terms of edges.

1 Tables

1.1 Static

column	type	unit	restriction
node_id	Int32	-	sorted
control_state	String	-	(optional) sorted per node_id
active	Bool	-	(optional, default true)
flow_rate	Float64	$^3/$	non-negative
min_flow_rate	Float64	$^3/$	(optional, default 0.0)
max_flow_rate	Float64	$^3/$	(optional)
min_upstream_level	Float64	\(\text{m}\)	(optional)
max_downstream_level	Float64	\(\text{m}\)	(optional)

2 Equations

The Outlet is very similar to the Pump, but it has an extra reduction factor for physical constraints:

\[ Q = \mathrm{clamp}(\phi Q_\text{set}, Q_{\min}, Q_{\max}) \]

• \(Q\) is the realized Outlet flow rate.
• \(Q_\text{set}\) is the Outlet’s target flow_rate.
• \(Q_{\min}\) and \(Q_{\max}\) are the Outlet min_flow_rate and max_flow_rate.
• \(\phi\) is the reduction factor, which smoothly reduces flow based on all of these criteria:
  • The upstream volume is below \(10 m^3\).
  • The upstream level is less than \(0.02 m\) above the downstream level.
  • The upstream level is below min_upstream_level + \(0.02 m\)
  • The downstream level is above max_downstream_level - \(0.02 m\)