Question

VI 30m HE on a 1:10000 is 75 what is the gradient

Answer 1

Assuming the condition is 'the VI is 30m and the HE on a 1:30000 map is 75mm, calculate the gradient':

The gradient is

$$\nabla=\dfrac{30}{75·30}=0.013.$$

This is equivalent to 1.3%.