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==Planning considerations==
==Planning considerations==
<h3>Best X-section</h3>
<h3>Best X-section</h3>
[[File:Best X-section.png|thumb|Both sections a)triangular and, b)trapezoidal, are constrained within ratios of 8/1 H:V]]
[[File:Best X-section.png|thumb|Both sections a)triangular and, b)trapezoidal, are constrained within ratios of 8:1 H:V]]
Enhanced swales aim to both reduce the flow rate and retain a portion of the conveyed water. For these purposes the best X-section is that which maximizes the wetted perimeter. The trapzoidal channel has the marginally greater hydraulic radius, but also the greater area.
{|class="wikitable"
|+ Examples worked without units, using the ratios given
|-
!Section
!Wetted perimeter
!Area
}