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<li>The design storm rainfall depth (R<sub>d</sub>, in mm), and </li>
<li>The design storm rainfall depth (R<sub>d</sub>, in mm), and </li>
<li> the efficiency of the pre-storage filter (η). </li></ul>
<li> the efficiency of the pre-storage filter (η). </li></ul>
Good catchment selection means that the runoff coefficient (β) should work out to be 0.9 or greater.  
Good catchment selection means that the runoff coefficient (C<sub>vol</sub>) should be 0.9 or greater.  
Filter efficiency can be reasonably estimated as 0.9 pending manufacturer’s information.  
Filter efficiency can be reasonably estimated as 0.9 pending manufacturer’s information.  
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