Riding arenas need care!
Especially in surface drainage it is very important that the surface is lasered at regular intervals.
In the case of drained sites, the main problem is that the fines are flushed downwards over time, by rain or irrigation systems and thus ensure that only the coarser grain remains on the surface. This has to the result that the riding arena sand can only be "ridden deep", which is not desirable.
If fleece-laid floors are loaded over longer periods of time, the fleece degrades and should either be replaced or fibres are repaired.
If you want to use your arena permanently, arena maintenance is a MUST!