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