water and carbon -hydrographs

Question 1

what does a hydrograph show?

Answer 1

.a graph that shows how a rivers discharge changes as a result of a period of heavy rainfall

Question 2

what are the 5 labels on a hydrograph?

Answer 2

.peak rainfall
.lag time
.peak flow or discharge
.rising limb
.falling limb

Question 3

what label is on the x axis?

Answer 3

.time in hours

Question 4

what label is on the y axis?

Answer 4

.rainfall in mm
.discharge in cummecs

Question 5

what is meant by lag time?

Answer 5

.the time between peak rainfall and peak discharge

Question 6

how do you know if a hydrograph is flashy?

Answer 6

.a flashy hydrograph is shorter (has a shorter lag time) because water reaches the river quicker

Question 7

how do you know if a hydrograph is subdued?

Answer 7

.longer hydrograph (longer lag time) because it takes longer for water to reach the river

Question 8

what factors affect a flashy or subdued hydrograph?

Answer 8

.geology
.presence of vegetation
.steepness of hill

Question 9

how does geology affect a flashy or subdued hydrograph?

Answer 9

saturated ground will result in a flashy hydrograph because water is traveling as overland flow and reaching the river quicker

Question 10

how does the presence of vegetation affect a flashy or subdued hydrograph?

Answer 10

presence of vegetation -lack of vegetation will result in a flashy hydrograph precipitation isn’t being intercepted nor stored in vegetation therefore water travels as surface runoff so water is reaching the river quicker

Question 11

how does the steepness of a hill affect a flashy or subdued hydrograph?

Answer 11

.a steep hill will result in a flashy hydrograph because naturally precipitation will travel downstream via overland flow therefore it reaches the river quicker, resulting in a short lag time