Page 53 - Water and Wastewater Engineering Design Principles and Practice

1-24 WATER AND WASTEWATER ENGINEERING

1-8 CHAPTER REVIEW

When you have completed studying this chapter, you should be able to do the following without
the aid of your textbook or notes:

1. Select the appropriate client–professional relationship for a given situation that de-
scribes the nature of the work and the knowledge/experience of the client.
2. Decide if any of the ASCE canons of the Code of Ethics may be violated for a given
situation that describes the proposed action.
3. Describe the five steps of the overall design process to a client that has not had previ-
ous experience with the design process for a municipal water or wastewater project.
4. Explain the role of each of the six elements of the design criteria in setting the bound-
ary conditions of the design.
5. Identify the critical decision points for a client in the design process.
6. Describe the six steps of the overall construction process to a client that has not had
previous experience with the construction process for a municipal water or wastewater
project.

With the aid of the text, you should be able to do the following:
7. Select the appropriate design alternative based on an engineering economic analysis of
the alternatives given the appropriate cost data, interest rate, and design life.

1-9 PROBLEMS
NOTE: An engineering economic analysis primer is available at http://www.mhprofessional
.com/wwe .
1-1. At the end of the preliminary design-stage of a small water treatment system design,
the following three options remain feasible. The consulting firm uses an interest rate
of 6.00% and a design life of 20 years for project evaluation. Based on cost, which
alternative should the engineering firm recommend?

Option Capital cost Annual operation and maintenance cost

Connect to nearby WTP $1,500,000 $300,000 a
Membrane A $2,374,000 $209,000
Membrane B $2,162,000 $258,000
a
The community will not have to provide O&M, but the nearby WTP will charge a monthly service fee
equivalent to this amount.

1-2. During the conceptual design stage of Problem 1-1, the design firm identifies the
need for iron removal that was not anticipated in the screening of alternatives.