On 05/08/2019 17:11, Bill Wright wrote:
I have some block paving that's on a slope. The slope varies from 1:40
to 1:10. When the rain washes across the area it takes some of the
silver sand. What's the way to stop this happening?

Bill

When this happened in Barry, after a massive thunderstorm
all the fancy block paving in the town centre was washed
up into big piles of blocks, just like the ripples
in the sand at Barry Island.