Changes

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To calculate the time (''t'') to fully drain the facility assuming three-dimensional drainage:  

To calculate the time (''t'') to fully drain the facility assuming three-dimensional drainage:  

<math>t=\frac{n\times A_{r}}{f'\times x}ln\left [ \frac{\left (d_{r} \frac{A_{r}}{x} \right )}{\left(\frac{A_{r}}{x}\right)}\right]</math>

<math>t=\frac{n\times A_{r}}{f'\times x}ln\left [ \frac{\left (d_{r} + \frac{A_{r}}{x} \right )}{\left(\frac{A_{r}}{x}\right)}\right]</math>

Where "ln" means natural logarithm of the term in square brackets <br>

Where "ln" means natural logarithm of the term in square brackets <br>

Adapted from CIRIA, The SUDS Manual C753 (2015).

Adapted from CIRIA, The SUDS Manual C753 (2015).