HIGHWAY STORMWATER PUMP STATION DESIGN

1.1 NEED FOR STORMWATER PUMP STATIONS
Stormwater pumping stations are necessary for the removal of stormwater from sections of
highway where gravity drainage is impossible or impractical. However, stormwater pumping
stations are expensive to operate and maintain and have a number of potential problems that
must be addressed. Therefore, the use of stormwater pumping stations is recommended only
where no other practicable alternative is available. Alternatives to pumping stations include
siphons, recharge basins, deep and long storm drain systems and tunnels.
1.2 INTENT OF MANUAL
This manual is intended primarily for highway drainage designers and others interested in the
hydraulic design of highway stormwater pump stations. Though some discussion relates to other
engineering disciplines and responsibilities, the information is basic and intended only to
enhance the hydraulic designer’s ability to accommodate other needs and communicate with
designers from other disciplines.
1.3 ORGANIZATION OF MANUAL
This manual is divided into fourteen chapters including this introduction. The general
organization can be classified as follows:
1. Identification and basic concepts (Chapters 2 and 3)
2. Design process (Chapter 4)
3. Design criteria, considerations, and procedures (Chapters 4 through 9)
4. Additional Information (Chapters 10 through 14, and appendices)
1.4 UNIT CONVENTION
The general convention employed in this manual is to present values and dimensions in
System Internationale (SI) units followed by English units in parentheses. Where practicable, the
manual provides equations with unit conversion factors. In this manner, only one equation
appears for a particular operation and the user must select the desired units and unit conversion
factor.
1.4.1 SI versus Metric
System Internationale (SI) units are very specific. Not all metric units are SI. For example,
linear measurements of millimeters and meters are metric and SI, whereas centimeters are metric
but not SI. This manual uses SI units except where noted to conform to industry standards.
1.4.2 Caution on Unit Usage
Most manufacturers in the US develop pumps and pumping equipment in English units. Few
present design data in SI units. The designer should take care when using and quoting units
because some variables that are seemingly dimensionless may have units. Some commonly used
coefficients have dimensions, which, in the strictest sense, should take on different values when
using SI units. These will be noted where appropriate throughout the text.
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