factors effecting the drainage basin

Question 1

factors affecting infiltration

Answer 1

porosity an permeability of the soil
duration of the rainfall
raindrop size
pre-existing soil moisture
slope angle 
veg cover-Veg increases infliltration speed as it intercepts some rainfall and slows down the speed at which the water arrives. Bare soil- 10mm/hr, veg soil- 50-100mm/hr

Question 2

factors affecting evaporation (or evapotranspiration)

Answer 2

temp
humidity
water available- low rates in deserts as little water available
colour of the surface(albedo)
windspeed- more wind= more evaporation because as the wind blows ir sweeps air born particles away- this creates extra room for water to evaporate

Question 3

transpiration

Answer 3

humidity
soil type
temp
windspeed
plant type

Question 4

river discharge

Answer 4

intensity of the rainfall- or just precipitation in general- relating to water availability
slope angle - steeper= get to river quicker
pre-existing soil moisture (antidecent moisture)= imperm.=surface run off
permeability and porosity of rocks and soil
temperature and evaporation