Task 1:
Consider the rectangular section of the wadi that you designed in assignment 1. In order to control the flow a Sluice gate is installed in the wadi. After some distance, a broad crested weir is also constructed as shown in figure 1. Determine the following:
a) Draw the specific energy diagram for the flow. [10 marks]
b) Minimum height of the Sluice gate (yg) that does not interrupt the flow. [10 marks]
c) Maximum height of the broad crested weir (P) which does not interrupt the flow in themainstream (Wadi). [10 marks]
Figure 1: Top view of mainstream with Broad Crested Weir and Sluice gate.
Task 2:
For the three reservoirs shown in figure -2, water surface elevations for reservoir A and C are ZA and ZC respectively. Reservoirs A and B are feeding reservoir C. The physical characteristics of the pipes are given in the attached excel sheet. Make the following design calculations of the water distribution system:
a) Calculate the water surface level of the reservoir B if QA = QB. [15 marks]
b) If the pipeline DC of the same material is replaced by another pipe of diameter DN, evaluate the change in percentage of discharge. [15 marks]
Task 3: [15 marks]
Water is flowing at the normal depth in a rectangular concrete channel that is ‘b’ wide encounters an obstruction as shown in figure 3, causing the water level to rise above the normal depth at the obstruction and for some distance upstream. The discharge in the channel is ‘Q’ and the channel bottom slope is S0. The depth of water just upstream from the obstruction is (y0). Find the distance upstream (L) to the point where the surface is at the normal depth. For accuracy, solve the problem by minimum five steps.