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The gatehouse was constructed at the Georgetown Reservoir to pump water into the four-mile long Washington City Tunnel that led to McMillan Reservoir, completed in 1902. [2] [3] A filtration system was constructed at McMillan in 1905 and this system improved the quality of city water. [3] [4] [5] Construction of the gatehouse began in 1899.
The Washington Aqueduct is an aqueduct that provides the public water supply system serving Washington, D.C., and parts of its suburbs, using water from the Potomac River. One of the first major aqueduct projects in the United States, it was commissioned by the U.S. Congress in 1852, and construction began in 1853 under the supervision of ...
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The Monocacy Aqueduct (#2) in Frederick County, Maryland is the longest aqueduct on the canal, crossing the Monocacy River. It was completed in May 1833. It is 516 feet (157 m) long, with seven 54 feet (16 m) arches. It was begun in March 1829 and finished in April 1833. Quartz sandstone came from nearby Sugar Loaf Mountain. Some stone was ...
A gatehouse is a type of fortified gateway, an entry control point building, enclosing or accompanying a gateway for a town, religious house, castle, manor house, or other fortification building of importance. Gatehouses are typically the most heavily armed section of a fortification, to compensate for being structurally the weakest and the ...
The Croton Aqueduct or Old Croton Aqueduct was a large and complex water distribution system constructed for New York City between 1837 and 1842. The great aqueducts , which were among the first in the United States , carried water by gravity 41 miles (66 km) from the Croton River in Westchester County to reservoirs in Manhattan .
The lay of the land dictated the castle's irregular shape. A site with natural defences was a typical location for Crusader castles and steep slopes provided Krak des Chevaliers with defences on all sides bar one, where the castle's defences were concentrated. This phase of building was incorporated into the later castle's construction. [26]
The State Route 99 tunnel, also known as the Alaskan Way Viaduct replacement tunnel, is a bored highway tunnel in the city of Seattle, Washington, United States.The 2-mile (3.2 km), double-decker tunnel carries a section of State Route 99 (SR 99) under Downtown Seattle from SoDo in the south to South Lake Union in the north.