storm hydrographs

Question 1

whats on the x and y axis on the storm hydrograph

Answer 1

x axis = time
y axis= river discharge

Question 2

what is discharge

Answer 2

the volume of water flowing through a cross section of river during a time period

Question 3

what is lag time

Answer 3

the time period between peak rainfall and peak discharge

Question 4

effect of direct channel input

Answer 4

very small amount of rainfall falls on river itself

Question 5

what are the two types of overland flow

Answer 5

-infiltration excess overland flow
-saturation excess overland flow

Question 6

what is infiltration excess overland flow

Answer 6

when the rain is falling more quickly than the infiltration rate

Question 7

what is saturation excess overland flow

Answer 7

when soil spaces are so full of water that no more rain can be absorbed

Question 8

what is the level of discharge before the storm called

Answer 8

the antecedent discharge

Question 9

different types of a storm hydrograph

Answer 9

-peak rainfall
-lag time
-peak discharge
-falling and rising limb
-normal flow

Question 10

how does the graph vary between a storm hydrograph and a river regime

Answer 10

river regime usually graphed over a year
storm hydrograph show discharge changes over short period of time

Question 11

what does the storm hydrograph shape depend on

Answer 11

-shape
-size
-drainage density
-rock type
-soil and vegetation
-relief

Question 12

what are hydro graphs with very steep limb, especially rising limb, high peak discharge and short lag time called

Answer 12

flashy

Question 13

what are gently inclined limbs with low peak discharge and long lag time hydro graphs called

Answer 13

delayed or flat

Question 14

what key concept links with storm hydrographs

Answer 14

planners in managing land use

Question 15

what is measured in a bar graph

Answer 15

rainfall

Question 16

what is measured in a line graph

Answer 16

-discharge