The weight capacity of an arch bridge depends on several factors, including the materials used, the design of the arch, and the span of the bridge. Generally, arch bridges can support a wide range of loads, from a few tons to several thousand tons. For example, the famous Pont du Gard aqueduct in France, which is an ancient Roman arch bridge, was designed to carry an estimated 40,000-60,000 tons of water. Ultimately, the weight capacity of an arch bridge is determined by engineering calculations and structural analysis.
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The Sydney Harbour Bridge is not the largest bridge in the world. There are many longer bridges. However, it is the largest steel arch bridge in the world, but not the longest. It's arch stands 134 m above the waters of Sydney Harbour.
Skew arch bridges of up to 45 degrees are not uncommon and many even exceed that figure. There's a helicoidal skew arch in the U.K. that was built of stone in 1830 to carry the Haggerleazes branch of the Stockton & Darlington Railway over the River Gaunless, which has a skew angle of 63 degrees. In other words, instead of crossing the river at the normal 90 degrees, the railway and river cross at 27 degrees. (90 - 27 = 63) There's a skew arch bridge built to a different principle (it's called a ribbed skew arch) in Harpenden, Hertfordshire, UK that carries the Midland Main Line across Southdown Road at an angle of only 25 degrees, giving the bridge a skew angle of 65 degrees. That's the most skewed arch bridge I know of but there may well be others and if so I'd like to know. (Reference: http:/en.wikipedia.org/wiki/Skew_arch)
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When the structure has faded or detoriorated (many, many years depending on the bridge).
Most standard domestic plumbing systems in north America will hold 125 psi, however most operate at anywhere from 35 -85 in daily use.