WATER RESOURCES ENGINEERING
3rd Edition
ISBN: 9781119490579
Author: Mays
Publisher: WILEY
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Chapter 19, Problem 19.4.2P
To determine
The return period that maximizes the expected annual net benefits.
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a) Define duty and derive the relationship between delta and duty?
b) What are the factors affecting duty?
Subject: irrigation engineering.
An unlined canal giving a seepage loss of 3.3 cumecs per million sqmetres of wetted area is proposed to be lined with 10 cm thick cement concrete lining, which costs Rs. 180 per 10 sq. metre. Given the following data, work out the economics of lining and benefit cost ratio.
Annual revenue per cumec of water from all crops Discharge in the Channel
Area of the channel
Wetted perimeter of the channel
Wetted perimeter of the lining
Annual maintenance cost of unlined channel per 10 sq. m Assumed additional suitable data, if required.
= 3.5 lacs
= 83.5 cumecs = 40.8 sq. meter = 18.8 meter
= 18.5 meter
= 1 Rs.
List seven major factors that determine a watershed’s response to a given rainfall. Explain the corresponding response for each factor.
Chapter 19 Solutions
WATER RESOURCES ENGINEERING
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- What is the ultimate BOD 24 km downstream from the outfall? > Answer: 3.89 g/m3 What is the DO deficit 24 km downstream of the effluent discharge? > Answer: 3.192 g/m3 Question: Is it possible to reduce the BOD of the effluent to maintain the DO above 7.0 mg/L at all downstream locations along the river? If so, what is the target BOD of the effluent?arrow_forwardThe average annual flood flow rates measured in a river is 800 m3/s, and the standard deviation is 400 m3/s. The probability distribution of the flood discharges conforms to the GUMBEL distribution.a) How many years is the return interval of 1300 m3/s, the largest observed flow rate, according to the GUMBEL distribution?b) Calculate the value of the 25-year flood flow. Thank you indeed for solving these question.arrow_forwardWhat are the advantages and disadvantages are associated with the construction, function, and operation of dams built of different materials?arrow_forward
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- The hydraulic and cost engineers of a water-related project proposal of ABC Construction is trying to agree on which two different sizes of pipe for a new water main. A 300- mm line will have an initial cost of Php1,250,000, whereas a 450-mm line will cost Php1,750,000. Since there is more head loss through the 300-mm pipe, the pumping cost is expected to bePhp 3000 more per year than for the 300-mm line. If the lines are expected to last for 30 years,which size should be selected on the basis of aA. present worth analysisB. future worth analysisusing an interest rate of 10% per year?arrow_forwarda) Outline the principles behind how the conjuctive use of surface water resources together with groundwater resources can be achieved. b) Explain why conjuctive use can lead to more effecience management of water resources than can be achieved if the two resources are managed individually.arrow_forwardWhat is the exceedance probability of a 500-year rainfall event?arrow_forward
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