Drainage formula (Water Overlay): Difference between revisions

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First the flow capacity is calculated
First the flow capacity is calculated


<math>Q_{p,t}=\Delta t*q_t</math>
<math>Q_{p,t}=\Delta t \cdot q_t</math>


<math>Q_{b} = A_d \cdot f_s \cdot  \frac{(w_g - w_w) \cdot A_w}{A_d \cdot f_s + A_w}</math>
<math>Q_{b} = A_d \cdot f_s \cdot  \frac{(w_g - w_w) \cdot A_w}{A_d \cdot f_s + A_w}</math>


<math>Q_{max} = A_d * (w_d - z_d) * f_s</math>
<math>Q_{max} = A_d \cdot (w_d - z_d) \cdot f_s</math>





Revision as of 14:54, 4 December 2020

Drainage passive: 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 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>