Changes

From left to right x = 12 m, x = 20 m]]<br>

From left to right x = 12 m, x = 20 m]]<br>

For some geometries, particularly deep or linear facilities, it desirable to account for lateral drainage, out the sides of the storage reservoir.  

For some geometries, particularly deep or linear facilities, it desirable to account for lateral drainage, out the sides of the storage reservoir.  

The following equation makes use of the hydraulic radius (''A<sub>p''/''x''), where ''A<sub>p'' is the area of the facility and ''x'' is the perimeter (m) of the facility. <br>

The following equation makes use of the hydraulic radius (''A<sub>r''/''x''), where ''A<sub>r'' is the area of the reservoir and ''x'' is the perimeter (m) of the reservoir. <br>

'''Maximizing the perimeter of the water storage reservoir of the facility will enhance drainage performance and directs designers towards longer, linear shapes such as [[infiltration trenches]] and [[bioswales]].''' See illustration for an example.<br>

'''Maximizing the perimeter of the water storage reservoir of the facility will enhance drainage performance and directs designers towards longer, linear shapes such as [[infiltration trenches]] and [[bioswales]].''' See illustration for an example.<br>

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_{p}}{f'\times x}ln\left [ \frac{\left (d_{r} + \frac{A_{p}}{x} \right)}{\left (\frac{A_{p}}{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).