LevelBoundary

LevelBoundary is a node whose water level is determined by the input. It can be used as a boundary condition like the level of the sea or a lake. Since the water level is unaffected by flow, it acts like an infinitely large Basin. Connect the LevelBoundary to a node that will look at the level to calculate the flow, like a LinearResistance.

1 Tables

1.1 Static

column	type	unit	restriction
node_id	Int32	-	sorted
active	Bool	-	(optional, default true)
level	Float64	\(\text{m}\)	-

1.2 Time

This table is the transient form of the LevelBoundary table. The only difference is that a time column is added and activity is assumed to be true. The table must by sorted by time, and per time it must be sorted by node_id. With this the levels can be updated over time. In between the given times the level is interpolated linearly, and outside the flow rate is constant given by the nearest time value. Note that a node_id can be either in this table or in the static one, but not both.

column	type	unit	restriction
node_id	Int32	-	sorted
time	DateTime	-	sorted per node_id
level	Float64	\(\text{m}\)	-

1.3 Concentration

This table defines the concentration of substances for the flow from the LevelBoundary.

column	type	unit	restriction
node_id	Int32	-	sorted
time	DateTime	-	sorted per node_id
substance	String	-	can correspond to known Delwaq substances
concentration	Float64	\(\text{g}/\text{m}^3\)

2 Equations

A LevelBoundary can be connected to a Basin via a LinearResistance. This boundary node will then exchange water with the Basin based on the difference in water level between the two.