Average daily streamflows on a river that drains a 2000 km2 watershed were recorded for 13 consecutive days and the measurements are as follows: Time (d) Flow (m3 /s) Time (d) Flow (m3 /s) 0 74 7 108 1 67 8 82 2 56 9 69 3 237 10 63 4 1920 11 57 5 607 12 51 6 168 Plot the direct runoff hydrography and estimate runoff depth (cm) using the concave method. (Hint: runoff depth