Operation & Maintenance
Rural Water Supply Operation And Maintenance Manual
Rural Water Supply Operation And Maintenance Manual
Credit to: https://www.worldbank.org/
February 2012
Introduction
The two main systems of measurement are the metric and the English systems. The metric system is also called the International Standard (SI) system. It has been accepted officially by practically all countries (a notable exception is the United States) and is used by all international scientific institutions and the United Nations. However, not all countries who have accepted it have been able to take the steps needed to fully convert from their previous system to the metric. This Manual will use the metric system primarily. It must be considered, however, that
much of the calibration of equipment in use in the water industry, as well as references, information, and standards (of which the US is a leading source) use measurements based on the English system. Thus, it is important to know both systems, and to be able to convert the measurements of one system to the other. The metric system is a decimal system based on 10, in which the higher- or lower-value units of measure are scaled by raising or reducing by a factor of 10. The basic measures of time, expressed in seconds, minutes, hours, days, months, and years, are common to both systems. However, decades (10 years), centuries (100 years), and millennia (1000) are graduated values that use the decimal or metric scale. This Chapter introduces the important units of measure that are frequently used in the establishment and operation of SSWP facilities. It also presents conversion tables and gives samples of how to convert from the English to the metric system.
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