I am sorry but the question didnt show up on my previous post when i tried to send it as an image.
Here is the question:
A 6hr storm rains on a 25 mi2 (65 km2) drainage watershed. Records from a stream gauging station draining the watershed are shown. (a) construct the unit hydrograph for the 6 hr storm. (B) find the runoff rate at t=15 hr from a two-storm system if the first storm drops 2 in (5cm) starting at t=0 and the second storm drops 5 in (12 cm) starting at t=12 hr.
t (hr) / Q (ft3/sec) / Q (m3/s)
0 / 0 / 0
3 / 400 / 10
6 / 1300 / 35
9 / 2500 / 70
12 / 1700 / 50
15 / 1200 / 35
18 / 800 / 20
21 / 600 / 15
24 / 400 / 10
27 / 300 / 10
30 / 200 / 5
33 / 100 / 3
36 / 0 / 0
Thank you for your help.