WATER SOURCES AND TREATMENT

Figure 2-16.Pole detail for use with the site plan shown in figure 2-15. - 14070_53

Figure 2-18.Transformer pad details for use with the site plan shown in figure 2-15. - 14070_55

Engineering Aid 1 - Advanced Structural engineering guide book
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Figure 2-17.—Cable-trench detail for use with the site plan shown in Figure 2-15. runs to three new 10-ampere fused cutouts before running to the new cable terminals and lightning arresters. Figure 2-16 also shows that a new three-wire shielded cable is connected to the cable terminators and runs down the pole. From the pole, the cable is then run, as shown in figure 2-17, at a specified distance underground to the new transformer pad. Figure 2-18 is a detail of the pad that the designer included in the working drawings for the circuit installation. As you can see, these details leave little doubt about the job requirements. However, other information, such as specified material requirements for the concrete, cables, conduit, and so forth; specified procedures for backfilling the trench and placing the concrete; and any other information necessary to a fill understanding of the material and installation requirements should also be shown on the drawings or in the project specifications. The preceding discussions of electrical trans- mission and distribution systems, distribution plans, and electrical details should leave you in a better position to aid the engineering officer or other design engineers. However, to increase your knowledge and to become even more valuable as an EA, you should further your studies by reading other publications, including the CE TRAMANs and commercial publications, such as The Lineman’s and Cableman’s Handbook by Kurtz and Shoemaker. Now let us look at some other utility systems that you will be involved with. WATER SUPPLY AND DISTRIBUTION A water supply system consists of all the facilities, equipment, and piping that are used to obtain, treat, and transport water for a water distribution system. A distribution system is a combination of connected pipes that carry the supplied water to the users. In this section, we will discuss water distribution so you will be familiar with the elements of a distribution system and types of information that is required on distribution drawings. First,, however, we will discuss water sources and the need for water treatment. Although it is the engineer’s responsibility to select a water source for use, to determine the methods of developing the source, and to design the supply and distribution system, you should have a general knowledge of this subject so you, as a technician, will be better able to assist the engineer. WATER SOURCES AND TREATMENT While the Navy prefers to obtain potable water from nearby public sources, it is sometimes not possible to do so. The following text briefly discusses the different types of water sources, source selection and develop ment, and the need for water treatment. Water Sources For most uses, the principal source of water is rain. This source is classified as surface water and ground- water. 2-14

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