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</poem>
 
</poem>
 
==Step 3==
 
==Step 3==
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[[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.  
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:<math>t=\frac{V_{R}A_{p}} {q'P}ln\left [ \frac{\left (d+ \frac{A_{p}}{P} \right )}{\left(\frac{A_{p}}{P}\right)}\right]</math>
 
:<math>t=\frac{V_{R}A_{p}} {q'P}ln\left [ \frac{\left (d+ \frac{A_{p}}{P} \right )}{\left(\frac{A_{p}}{P}\right)}\right]</math>
 
</poem>
 
</poem>
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==Final step==
 
==Final step==
 
<poem>
 
<poem>
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