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→Grates
[[File:Clogged drain.jpg|thumb|Drain clogged by 9 squares of 32 = 28 %]]
[[File:Clogged drain.jpg|thumb|Drain clogged by 9 squares of 32 = 28 %]]
==Grates and orifices==
Debris in stormwater is often deposited in the narrowest parts of our low impact development systems. Garbage, leaf litter and sediment all contribute towards the clogging of these structures.
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.
==Geotextiles/filter fabric==
==Geotextiles/filter fabric==