i think it could have gone either way because you might know all the information but its the way you answer the question that makes you loose marks so I'm just praying tbh
I put about urban developments meaning increased surface run off, less permeating water for human effect. Physical effect I put impermeable rock prevents water soaking in, so again more surface run off. Both effects make a hydrograph that looks like the one on the left. Stated lag times, rising limb etc.