5.3C

Question 1

What do storm hydrographs depend on

Answer 1

Physical features of drainage basin:
size, shape, drainage density rock type, soil, relief and vegetation

human factors:
land use and urbanisation

Question 2

labels on a strom hydrograph?

Answer 2

rising limb, peak discharge, lag time, falling limb and peak rainfall

Question 3

Define peak flow

Answer 3

The maximum discharge,delayed after maximum precipitation has
occurred.

Question 4

Define lag time

Answer 4

The time delay between peak
rainfall and peak discharge

Question 5

define falling limb

Answer 5

As the storm precipitation levels decrease, discharge will in turn decrease over time

Question 6

Define rising limb

Answer 6

The increase of river discharge, not necessarily instantaneously
after precipitation.

Question 7

Define base flow

Answer 7

the contribution to river flow from long term storage sources such as permeable rock, areas of bog and marsh and peat covered moorlads

Question 8

define bankfull discharge

Answer 8

a river’s water level reaches the top of its channel (any more water and flooding occurs)

Question 9

define approach segment

Answer 9

shows the discharge of the river before the storm

Question 10

define storm run off

Answer 10

part of river flow derived from immediate rainfall event (most rapid water trasnfer is through overland and via throughflow)

Question 11

check out pmt detailed notes for factors affecting storm hydrograph

Answer 11

page 9 and onenote page in water secrtion

Question 12

Describe a flashy hydrograph

Answer 12

Short lag time
High peak
Steep rising limb

Question 13

Describe subdued storm hydrograph

Answer 13

Long lag time
Low peak
Gently sloping rising limb