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March 5 – Tennessee's first case of COVID-19 is confirmed in Williamson County, marking the start of the COVID-19 pandemic in Tennessee. 2023 March 27 – A mass shooting occurs at a private Presbyterian Church in America parochial school in Nashville, Tennessee, killing three children, three adults, and the perpetrator.
Manhole closings are protected by a grating or manhole cover, a flat plug designed to prevent accidental or unauthorized access to the manhole. These covers are traditionally made of metal, [2] but may be constructed from precast concrete, glass reinforced plastic or other composite materials (especially where cover theft is of concern ...
The larger line enters from the right and changes direction within the manhole to exit from the top of the photo. A smaller line enters from the bottom of the photo under the access steps. The concrete floor of the manhole has channels to minimize accumulation of solids. Interior of a large sanitary sewer viewed from an access manhole chamber.
A manhole cover sits on a metal base, with a smaller inset rim which fits the cover. The base and cover are sometimes called "castings", because they are usually made by a casting process, typically sand-casting techniques. [1] Pick holes in manhole cover, Palo Alto, California, USA Manhole valve made in 2022
Maps in Ancient Babylonia were made by using accurate surveying techniques. [12] For example, a 7.6 × 6.8 cm clay tablet found in 1930 at Ga-Sur, near contemporary Kirkuk, shows a map of a river valley between two hills.
Each of Tennessee's 95 counties has at least one listing. The Tennessee Historical Commission, which manages the state's participation in the National Register program, reports that 80 percent of the state's area has been surveyed for historic buildings. Surveys for archaeological sites have been less extensive; coverage is estimated less than ...
Conquistador Hernando de Soto, first European to visit Tennessee. In the 16th century, three Spanish expeditions passed through what is now Tennessee. [12] The Hernando de Soto expedition entered the Tennessee Valley via the Nolichucky River in June 1540, rested for several weeks at the village of Chiaha (near the modern Douglas Dam), and proceeded southward to the Coosa chiefdom in northern ...
The triangle marker design was the only design until November 1983, when Tennessee divided its routes into primary routes and secondary or "arterial" routes with the adoption of a functional classification system, creating a primary marker and making the triangle marker the secondary marker; primary marker signs were posted in 1984. [2]