It is not of course. The problem has been the building boom sucking up sand far faster than planning made provison for.
Rivers and beaches do a wonderful job sorting all this stuff out. The difficulty is that the regulatory package takes time when you are close to a city which is important for the economics.
Of course, in a real emergency, we will convert a suburb into a gravel pit and use screening systems.
Other wise, if you wish to create a million square miles of new beaches, double the price and we will deliver the entire Sahara desert to your loading gate.
Why the world is running out of sand