Determine the various forces acting on a concrete weir given the following information (7 marks):

• Height of weir = 2.0 m;
• Top width of weir (weir crest width) = 0.5m
• Upstream water depth = height of weir;
• Downstream water depth is one-third of the weir height;
• Depth of silt on the upstream = 0.5m;
• Vertical upstream face;
• Downstream slope of 1:0.5;
• Foundation material = rock, coefficient of friction, f = 0.70

Also check the stability of the weir against:

• Sliding (2 marks)
• Overturning (5 marks)