On a farm in Ontario there is a grassed waterway. At the bottom end, the waterway is 9 m wide and 30 cm deep at its deepest point in the centre.
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2. On a farm in Ontario there is a grassed waterway. At the bottom end, the waterway is 9 m wide and 30 cm deep at

its deepest point in the centre. It is dish-shaped and well covered with short grass (n = 0.03 in metric units). The slope is 1%. During the summer of 2010, there was an unusually large rainfall event -- 18 cm fell in two hours. At the peak of the runoff, the rate of the overland flow towards the grassed waterway was 9 cm/hour. The watershed area serviced by the grassed waterway is 30 hectares.



a. Was the grassed waterway capable of properly conducting the maximum discharge produced during that storm.


b. Should the farmer consider having the waterway enlarged to be able to accommodate such flows.

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