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→Step 3
</poem>
</poem>
==Step 3==
==Step 3==
[[Sizing bio2.png|thumb|The duration of surface ponding is usually determined by the emptying of the facility below.]]
[[File:Sizing bio2.png|thumb|The duration of surface ponding is usually determined by the emptying of the facility below.]]
<poem>
<poem>
The 'bowl' area is simply the depressed elevation of the surface compared to the surrounding areas; a space to permit temporary ponding.
The 'bowl' area is simply the depressed elevation of the surface compared to the surrounding areas; a space to permit temporary ponding.