A two-hour duration storm event with uniform excess rainfall of 3 cm occurred on a watershed. The ordinates of streamflow hydrograph resulting from this event are given in the table Time (hours) 0 1 2 3 4 5 6 7 Stream flow (m3/s) 10 16 34 40 31 25 16 10 Considering a constant baseflow of 10 m3/s, the peak flow ordinate (in m3/s) of one-hour unit hydrograph for the watershed is ________ . (in integer)

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