Our golf course in Madeira, Portugal has to ship sand 800km from Morocco for bunkers as all natural sand on the island is black. At the moment this has resulted in a reasonable sand depth being present in the areas of the rims to RHS bunkers but in portions of the central areas the sand is no more than 3-4mm deep with hard packed earth below resulting in a sand wedge bouncing off and it is impossible to take any sand in the shot. Incan find no definition of depth of sand in the Portuguese or R&A documents whereas the USGA states sand should be a minimum of 4” or 100mm. Would there be grounds for temporary relief without penalty by dropping the ball in an area where sand exists but no nearer the hole as per the rule for standing water until such time as we can ship more sand?? Would appreciate opinion on the issue. Robert