Drainage formula (Water Overlay)

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Drainage passive

First the flow capacity is calculated

if then:

else:


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

Drainage active

Case 1: Active Draining:

If a positive Pump q is defined:

If an overflow threshold T_{o,t} is defined as well:

After calculating the capacities, the actual water pumped upwards is calculated. If any of the terms are undefined, they are not included.

Case 2: Active Reverse Draining:

If a negative Pump q is defined:

If a lower threshold Tl,t is defined as well:

If an upper threshold Tu,t is defined as well:

If a capacity Qtotal is defined:

After calculating the capacities, the actual water pumped upwards is calculated. If any of the terms are undefined, they are not included.


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