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Cable-Stayed Bridges Have you ever seen a bridge that looks like it has long fishing lines traveling up its sides? If so, you've probably been looking at a cable-stayed bridge. These bridges are created by attaching flexible metal cables to tall towers placed all along the bridge. These cables are lightweight, and their flexibility is helpful when strong winds blow against the bridge. The Brooklyn Bridge is an example of a cable-stayed design.
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USE OF TREATED WASTEWATER.
Effluent from wastewater treatment plants can be used for irrigation when authorized. Only treated effluent having a detectable chlorine residual at the most remote discharge point will be used. Where state or local regulations require additional treatment for irrigation, such requirement will be complied with. The effluent irrigation system must be physically separated from any distribution systems carrying potable water. A detailed plan will be provided showing the location of the effluent irrigation system in relation to the potable water distribution system and buildings. Provision will be made either for locking the sprinkler irrigation control valves or removing the valve handles so that only authorized personnel can operate the system. In addition, readily identifiable "nonpotable" or "contaminated" notices, markings or codings for wastewater conveyance facilities and appurtenances will be provided. Another possibility for reuse of treated effluent is for industrial operations where substantial volumes of water for washing or cooling purposes are required. For any re use situation, great care must be exercised to avoid direct cross connections between the reclaimed water system and the potable water system.

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WATER SUPPLY SOURCES
Water supplies may be obtained from surface or ground sources, by expansion of existing systems, or by purchase from other systems. The selection of a source of supply will be based on water availability, adequacy, quality, cost of development and operation and the expected life of the project to be served. In general, all alternative sources of supply should be evaluated to the extent necessary to provide a valid assessment of their value for a specific installation. Alternative sources of supply include purchase of water as well as consideration of development or expansion of independent ground and surface sources. A combination of surface and ground water, while not generally employed, may be advantageous under some circumstances and should receive consideration. Economic, as well as physical, factor must be evaluated. The final selection of the water source will be determined by feasibility studies, considering all engineering, economic, energy and environmental factors.