hydrographs Flashcards
1
Q
define hydrograph
A
a graph of river discharge over time
2
Q
define river discharge
A
the volume of water that flows in a river per second
3
Q
what is river discharge measured in?
A
cumecs
4
Q
define peak discharge
A
highest point on graph
river discharge = greatest
5
Q
define lag time
A
delay between peak rainfall & peak discharge
6
Q
define rising limb
A
part of graph up to peak discharge
7
Q
define falling limb
A
part of graph after peak discharge
8
Q
rapid runoff
short lag time
high peak
what hydrograph is this describing?
A
flashy
9
Q
what does a flashy hydrograph look like?
A
steep
symmetrical rising & falling limbs
10
Q
what factors affect the shape of a hydrograph?
A
size of drainage basin
shape of drainage basin
gradient of land
rock & soil type
