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Plant Security
Published in Frank R. Spellman, Fundamentals of Public Utilities Management, 2020
A fence is a physical barrier that can be set up around the perimeter of an asset. Fences often consist of individual pieces (such as individual pickets in a wooden fence, or individual sections of a wrought iron fence) that are fastened together. Individual sections of the fence are fastened together using posts, which are sunk into the ground to provide stability and strength for the sections of the fence hung between them. Gates are installed between individual sections of the fence to allow access inside the fenced area.
Fences (or Weirs) and Barrier Dams
Published in Charles H. Clay, P. Eng, Design of Fishways and Other Fish Facilities, 2017
Barrier fences have been used in other countries to trap fish for fish cultural purposes. Figure 5.7 shows two fences installed for this purpose at Loch NuCroie and Loch Poulary in the north of Scotland. These are constructed of concrete on gravel foundations. Concrete piers spanned by steel beams support the fence panels. The panel construction, bar spacing, etc., are similar to those already described, except that there are no horizontal panels. The alignment of the fences in a “V” pattern in plan to assist in leading the fish to the traps, which project upstream, will be noted. It will also be noted that only one trap is at the apex of the “V” in each case, the others being distributed across the fence. These fences are used to capture entire runs of Atlantic salmon for maturing and stripping, and hatchery rearing of the progeny.
Upgrading Security
Published in Frank R. Spellman, The Drinking Water Handbook, 2017
A fence is a physical barrier that can be set up around the perimeter of an asset. Fences often consist of individual pieces (such as individual pickets in a wooden fence or individual sections of a wrought iron fence) that are fastened together. Individual sections of the fence are fastened together using posts, which are sunk into the ground to provide stability and strength for the sections of the fence hung between them. Gates are installed between individual sections of the fence to allow access inside the fenced area.
Architectural design methods for mountainous environments
Published in Journal of Asian Architecture and Building Engineering, 2023
Guangzhao Zeng, Dongmiao Zhao, Xiaofei Chen, Xingtian Wang
The height of the fence increases as the height difference of the external road becomes greater. In Grade I or Grade II areas, the height of the fence is generally below 3 m, since the inclination angle of the external road is small and the height difference is only up to 3 m. In the area of Grade III, the height of the fence is generally above 3 m. As the length of the external road becomes longer, resulting in a greater height difference, the height can reach 4 m. More details of the design methods can be seen in Figures 10(a–b). The style of the fence shows different forms with the change in height difference. In the area of Grade I, because of less variation in the height difference, the height is low. As a result, the construction of the fence is less difficult, which makes the form of the fence more flexible. Therefore, a fence that shows a stepped shape followed by an external road is always used. In the area of Grade II, because of the large change in height difference, the height is above 3 m. To reduce the difficulty of construction, the height of the fence generally maintains a consistent rather than a stepped shape. In the area of Grade III, with greater variation in height difference, the height of the fence can reach up to 4 m. Therefore, the fence is always used in combination with the garage. More details of the design methods can be seen in Figures 10(c–d)