Thanks for the input guys. The project design is progressing.
The pad is going to be fully regraded and our Civil Engineer has worked out the falls to be workable at 0.5% with 200mm topping of gravel or crushed limestone.
The whole pad (65m wide) will have a continuous fall from west to east...
We are designing a central storage 'precinct' for a large farm, to contain sheds, silos, water & chemicals tanks, etc. All of this on a compacted hardstand (in this case it is not feasible to finish the whole area - 7000m² - with bitumen or concrete).
What is the minimum fall we should allow...
