Throughidges

Throughidges are a type of bridge designed to carry a waterway, such as a canal or river, over another obstacle, typically a road, railway, or valley. Unlike a more common aqueduct that carries water over land, a throughidge is specifically engineered to maintain the navigability or flow of a watercourse while allowing passage beneath it. This often involves a substantial structure that can support the weight of the water and the vessels that may travel on it.

The design of a throughidge must consider several factors, including the width of the waterway it carries, the depth of the water needed for navigation, and the clearance required for the passage below. These bridges can be constructed from various materials, such as stone, brick, concrete, or steel, depending on the span and load requirements. Historically, many throughidges were built using masonry, while modern examples often utilize reinforced concrete or steel for greater strength and span capabilities.

The construction of a throughidge can be a complex engineering feat, especially when dealing with significant waterways or challenging terrain. They are essential components of many canal systems and waterways, allowing for the uninterrupted transport of goods and passengers without disrupting surface-level infrastructure. Examples can be found in various countries, particularly those with extensive canal networks developed during the Industrial Revolution.