1. The problem statement, all variables and given/known data In my book , i was told that when the drainage of surface is high then the surface runoff will be low . However , i dont think it's correct . 2. Relevant equations 3. The attempt at a solution Definiton : Runoff can be described as the part of the water cycle that flows over land as surface water instead of being absorbed into groundwater or evaporating. I think that when the surface drainage is high , more water will be drained from the particular surface to another . This results in more water absorbed , resulting in higher surface runoff , correct me if i am wrong .