Extracted text: 6.15 The ordinates of the 2-h unit hydrograph of a basin are given: Time (h) 2-h UH 4 6. 8 10 12 14 16 18 20 22 ordinate (m/s) 0 25 100 160 190 170 110 70 30 20 6 0 Determine the ordinates of the S,-curve hydrograph and using this S-curve, determine the ordinates of the 4-h unit hydrograph of the basin.