Drainage formula (Water Overlay)

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Drainage passive: First the flow capacity is calculated

Failed to parse (unknown function "\abs"): {\displaystyle Q_{b} = A_d \cdot f_s \cdot \abs{\frac{(w_g - w_w) \cdot A_w}{A_d \cdot f_s + A_w}}}

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 average storage percentage of the ground above the drainage.
is the amount transfered for a balanced ground and surface water level
<math>Q_{max} is the amount available in the ground above the drainage.
<math>