Drainage formula (Water Overlay)

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Drainage passive: First the flow capacity is calculated

if then:

else:

Drainage active: First the flow capacity is calculated

Where:

is the ground water level in meters
is the water level in the waterway
is the drainage datum height in meters.
is the drainage area size in square meters.
is the waterway area size in square meters.
is the max waterway height.
is the average storage percentage of the ground above the drainage.
is the amount transferred for a balanced ground and surface water level
is the amount available in the ground above the drainage.
is the drainage capacity at time t
is the actual drained volume at time t

Related

The following topics are related to this formula.

Structures
Drainage
Models
Surface model
Underground model