If appropriately designed a strainer or leaf filter is supposed to keep larger objects from going down a drain while allowing smaller debris through with the water flow most strainers or domes that cover a drain on flat roofs are poorly designed because they block smaller debris and the strainer becomes clogged preventing any water flow.
Roof drain strainer.
They become brittle and break.
This video explains the principle of a drain basin.
The hidden baskets are detachable for easy cleaning.
This is by far is the best way to make sure that your drains are doing the job they are meant.
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These buckets are designed to help prevent debris and sediment from going down the drain and.
10 inch plastic roof drain dome strainer grate 3 hole yellow portals 67111 10 inch yellow polyethylene drain dome strainer grate.
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9 1 2 od base x 4 1 4 high with 3 bolt mounting holes.
If you are more serious about ensuring proper drainage then lowering the drain is another option.
If appropriately designed a strainer is supposed to keep larger objects from going down a drain while allowing smaller debris through with the water flow.
Easy to install in a variety of shower drains these strainers are designed to catch hair and other debris helping drain pipes remain free of clogs.
A plastic strainer for a flat roof drain is not a good idea.