(a) With respect to a broad crested weir, what is meant by the ‘submergence ratio’ and why is it important? (b) Water flows along a rectangular channel in which there is a broad crested weir with a horizontal crest. The channel is 9.0m wide, and upstream of the weir the depth of flow measured from the channel bed is 1.1m when the discharge is 8.24m3 /s. Ignoring any loss of energy, what is the minimum height of the weir that will allow it to function with critical depth on the crest? (c) If a broad crested weir has a coefficient of discharge, C, of 1.65, and if it completely spans a 17.4m wide rectangular channel, what would be the head over the weir when the discharge is 6.8m3 /s?