Flood Hydrographs

Question 1

what is flood hydrograph used to do?

Answer 1

represent rainfall for the drainage basin of a river and the discharge of the same river on a graph

Question 2

numerous factors affect whether the flood hydrograph will be:

Answer 2

flashy or subdued

Question 3

what factors may make it flashy?

Answer 3

short lag time, steep rising and falling limb, higher flood risk ,high peak discharge

Question 4

what factors may make it subdued?

Answer 4

long lag time, gradually rising and falling limb, lower flood risk, low peak discharge

Question 5

how does impermeable surface increase surface runoff?

Answer 5

decrease in infiltraton

Question 6

how does elongated basin create a flashy hydrograph?

Answer 6

precipiation reaches river in a shorter distance

Question 7

how does larger relief create a flashy hydrograoh?

Answer 7

water flow speed is aided by gravity

Question 8

pastoral farming - fashy

Answer 8

ground tramples so less interception

Question 9

deforestation - flashy

Answer 9

less interception

Question 10

high rainfall intensity - flashy

Answer 10

higher discharge potential

Question 11

antecedent rainfall - flashy

Answer 11

increased surface runoff as ground is saturated

Question 12

impermeable underlying geology - flashy

Answer 12

decreased infiltration

Question 13

high drainage density - flashy

Answer 13

many tributaries to main river