Changes

It is often prudent to assume that maintenance will be intermittent and to include a clogging factor into engineering calculations to account for periods in which the debris has not been removed.  

It is often prudent to assume that maintenance will be intermittent and to include a clogging factor into engineering calculations to account for periods in which the debris has not been removed.  

A suggested value of 0.5 is often adopted. This is equivalent to 50 % of the cross-section of the structure being clogged during the flow being calculated.  

A suggested value of 0.5 is often adopted. This is equivalent to 50 % of the cross-section of the structure being clogged during the flow being calculated. Note though that in the orifice equation (for example) the clogging factor goes up to indicate that 100 % of the flow can pass when factor = 1 and the factor goes down as the device clogs.

e.g. In the image on the left 23 % of the grate is impassable. The clogging factor is 1.00 - 0.23 = 0.77.  

==Geotextiles/filter fabric==

==Geotextiles/filter fabric==