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mLine 60:
Line 60: − − To calculate the time (''t'') to fully drain the facility: − :<math>t=\frac{V_{R}A_{p}} {q'P}ln\left [ \frac{\left (d+ \frac{A_{p}}{P} \right )}{\left(\frac{A_{p}}{P}\right)}\right]</math>
→Calculate drawdown time
*''P'' is the perimeter of the practice (m), and
*''P'' is the perimeter of the practice (m), and
*''d'' is the total depth of the practice, including the ponding zone (m).}}
*''d'' is the total depth of the practice, including the ponding zone (m).}}
This 3 dimensional equation makes use of the hydraulic radius (''A<sub>p</sub>''/''P''), where ''P'' is the perimeter (m) of the facility. <br>
This 3 dimensional equation makes use of the hydraulic radius (''A<sub>p</sub>''/''P''), where ''P'' is the perimeter (m) of the facility. <br>