Chapter 13, Problem 19P

During a prefeasibility survey, you have identified a feasible site for a micro hydropower scheme. If you’ve measured a gross head of 40 m, and from the hydrological analysis, a design flow of 150 l/s appears to be available throughout the year, what would be the likely installed capacity? Assume an overall efficiency of 60%.

Through water diversion from a tributary of the Vaal River drainage system, a rectangular prismatic canal of dimensions 3 m depth and the width is 300% of the depth has been proposed. The canal is in concrete -finished and is intended to service a small community. The discharge in the canal is assumed to be 0.36 Megaliter/min. Calculate total energy, energy grade line, hydraulic grade line at the start of the diversion point if its elevation is 1400 m

At a proposed hydroelectric power plant site, the average elevation of headwater is 600m and the tailwater elevation is 480m. The average annual water flow is determined to be equal to that volume flowing through a rectangular channel 4m wide and 0.5m deep and average velocity of 5.5m/s. Assuming the plant will operate 350 days/year, find the energy kwh that the plant site can developed if the hydraulic turbine that will be used has an efficiency of 78% and generator efficiency of 90%. Consider a headwork loss of 4% of the available head.

A rectangular channel 4 m wide has a depth of 2.5 m at a flow rate (discharge) of 12 m^3/s. Draw a specific energy diagram for the current flow conditions and determine whether the flow is sub-critical or super-critical ?

1. In a 3.0 m wide rectangular channel, the discharge is 15.0 m⅔. Calculate the critical depth and the specific energy for the flow in the channel.

3. Explain different components of small hydroelectric power system and their design considerations.

(a)Evaluate hydropower plants in terms of social and economic impact with your own evaluation. (b)Hydropower plants could be classified according to the quantity of water, water head, plant capacity, and load characteristics. Categorize the hydropower plants according to the water head.

Two reservoirs A and B have elevations of 250m and 100m respectively. It is connected by a pipe having a diameter of 250mm and a length of 100m. A turbine is installed at point in between reservoirs A and B. If C = 120, compute the following if the discharge flowing in the pipeline is 150 liters/sec. Compute the power generated by the turbine.

Two reservoirs A and B have elevations of 250 m and 100 m, respectively. It is connected by a pipe having adiameter of 250 mm and a length of 100 m. A turbine, with an efficiency of 0.95, which is installed at a point inbetween A and B, is used to supply 233 kW of electric power to a nearby community. If the total head loss as watertravelled from reservoir A to B is 25 m, determine the discharge inside the pipe in liters per second.