Drainage formula (Water Overlay): Difference between revisions

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: <math>z_d</math> is the drainage datum height in meters.
: <math>z_d</math> is the drainage datum height in meters.
: <math>A_d</math> is the drainage area size in square meters.
: <math>A_d</math> is the drainage area size in square meters.
: <math>A_w</math> is the waterway area size in square meters.
: <math>z_w</math> is the max waterway height.
: <math>f_s</math> is the average storage percentage of the ground above the drainage.
: <math>f_s</math> is the average storage percentage of the ground above the drainage.
: <math>Q_{b}</math> is the amount transfered for a balanced ground and surface water level
: <math>Q_{b}</math> is the amount transfered for a balanced ground and surface water level

Revision as of 15:10, 4 December 2020

Drainage passive: First the flow capacity is calculated

if w_w > w_g then:

else:

Drainage active:


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 transfered 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