6. (15 pts). The following hydrograph was observed from a 4.1" 4-hour rainfall period from

a 2.2 mi² watershed. Identify the baseflow, if any; the peak discharge, time base and

time to peak of the direct runoff.

t(hrs)

0

2

4

6

8

10

12

14

16

18

20

22

24

26

28

Q(cfs)

60

63

70

129

300

360

273

195

123

87

70

66

400

350

300

250

(sp) D

150

100

50

64

63

62

Figure 1 Observed discharge Hydrograph

30

60

7. (10 pts) What is the volume of direct runoff in acre-ft and inches (rainfall excess) over

the watershed?

0

0

3

6

9

12. 15

Time (hrs)

8. (5 pts) What is the 4-hour unit hydrograph peak discharge rate (cfs/in)?

18

21

24