a)Explain the affects that Urbanisation can have on the hydrology of a catchment. Outline how SuDs can mitigate these impacts and explain the role and features of the following systems:
b)The 10mm 1Hr TUH ordinates for the Rabid Badger River is shown in Table 1.
Table 1: 10 mm 1 h TUH ordinates
Calculate the peak flow from a storm where 25 mm of effective rain falls in the first hour followed by 33 mm in the second hour and 6 mm in the third hour, by plotting the storm hydrograph on graph paper.
a)Identify the differences in design, operation and treatment performance between Slow Sand Filters and Rapid Gravity Filters for drinking water treatment and use a diagram to illustrate your answer. Comment on where each system is typically most often used and why they are appropriate for these situations.
b)State the impacts that raw sewage can have on rivers. Explain how 3-stage conventional sewage treatment reduces these impacts, identify the systems typically used in the 3 stages and pollutants removed in each system.
take x = 7.2. A rectangular gate is located underwater (in fresh water) as shown, in section, in Figure Q3. The gate is aligned at 15 degrees to the vertical and at the top of the gate there is a hinge which lies x m vertically below the water surface, as shown. If the gate has a height of 0.65 m and a width of 0.45 m calculate
(a) the pressure at the hinge
[5 marks] (b) the force of the water on the gate in kN
[8 marks] (c) the location of the point of action of the force below the water surface (i.e., the distance y) correct to 3 decimal places
. Figure Q4 shows a pontoon floating in fresh water. The weight of the pontoon is 7553 kN. The pontoon has a length of 18 m and a width (in plan) of 11 m. It has an overall height of 5.5 m as shown. Calculate:
(a) the volume of water displaced by the pontoon
[4 marks] (b) the depth of immersion of the pontoon
[4 marks] (c) the distance BM for design purposes (where B is the centre of buoyancy and M is the position of the metacentre)
[8 marks] (d) the value of GM, assuming the position of the centre of gravity is level with the top surface of the pontoon
[8 marks] (e) is the pontoon stable? (yes or no)
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