When all the fine dust and sand has been removed by deflation (wind and/or water erosion) a layer of stones is left behind called desert pavement.
Some beaches consist of coarse gravel. Shall I order fine or coarse gravel for the concrete walkway?
desert gravel is just dried clay
I suggest you put the coarse gravel on top, the fine gravel in the middle and the cotton balls on the bottom. The less gaps in the material the more dirt will get trapped. The coarse gravel will take a small amount of the dirt out. Then the fine gravel will take out more and finally the cotton balls will most likely take out the rest leaving an evenly distributed amount of dirt in each layer. If the cotton balls are on top then the dirt would fill the cotton balls and some of it might still come through then the layers of gravel may not be effective to such small pieces of dirt.
The amount of time that gravel can retain water will vary depending on its state. Fine gravel will holder water for long as opposed to coarse gravel.
Desert pavement
of coarse if clean gravel.
Coarse aggregate can also be described as gravel, crushed rock, rocks or stones.
It becomes desert gravel still.
Distribution of soil particles for identifying the type of soils ie., wherther it is well graded or uniform graded or poorly graded soil.And also fine sand, medium sand coarse sand or fine gravel, medium gravel, coarse gravel etc.
layer of sand then a layer of activated charcoal then a layer of gravel.
it is a layer in binder coarse
I need to know how thick the layer of gravel is meant to be.