The awning is made by leveling C15 fine stone concrete to a thickness of 20cm at the thinnest part.

Find a slope of 1% towards the rainwater outlet. The width of the canopy is 1200 and the length is

Find a slope of 1% towards the rainwater outlet. The width of the canopy is 1200 and the length is 6000.

The thinnest part is 20,

The thickest part is 21200X1%=32

（232）/2X1200X6000=1.87 This is the theoretical value. In fact, you can take 2 and you can get it immediately

The above is concrete for construction

The concrete for structure should be according to the x length of the canopy section