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A chart datum is the water level surface serving as origin of depths displayed on a nautical chart and for reporting and predicting tide heights. A chart datum is generally derived from some tidal phase, in which case it is also known as a tidal datum. [1] Common chart datums are lowest astronomical tide (LAT) [1] and mean lower low water (MLLW).
20 km – diameter of the least massive neutron stars (1.44 solar masses) 20 km – diameter of Leda, one of Jupiter's moons; 20 km – diameter of Pan, one of Saturn's moons; 22 km – diameter of Phobos, the larger moon of Mars; 27 km – height of Olympus Mons above the Mars reference level, [159] [160] the highest-known mountain of the ...
During this twelve-month period, water levels ranged from 1.38 to 0.71 feet (42–22 cm) below Chart Datum. [27] The all-time low-water mark was eclipsed in January 2013. [28] In January 2013, Lake Michigan's monthly mean water levels dipped to an all-time low of 576.2 ft (175.6 m), [29] reaching their lowest ebb since record keeping began in 1918.
This is different from "overland flow" defined as "surface runoff". The Red River Valley is a former glacial lakebed, created by Lake Agassiz, and over a length of 550 mi (890 km), the river course drops only 236 ft (72 m), for an average slope of about 5 inches per mile (or 8.2 cm per kilometer). [12]
The lake spans 309 ha (760 acres), which makes it the second largest lake in the country. It has a length of 3 km (1.9 mi) and a width of 1.5 km (0.9 mi). The water level is 199 m (653 ft) above sea level and maximum depth of the lake is 71 m (233 ft). The lake is open to the public since 12 September 2020.
the rate of rise of the water level in the hole is recorded; the K-value is calculated from the data as: [8] = where: K is the horizontal saturated hydraulic conductivity (m/day) H is the depth of the water level in the hole relative to the water table in the soil (cm): H t = H at time t; H o = H at time t = 0
It is designed to accept water into the canal when the water level at the Sava Bridge gauge exceeds 350 cm (11 ft 6 in), which corresponds to a flow of 1,900 m 3 /s (67,000 cu ft/s). [145] This acts to reduce the amount of water entering the urban area during high water events, and decrease the risk of the floodwater rising past the crown of ...
• Water: 4%: Coastline: 2,782 km (1,729 mi) ... above sea level is the highest point in ... Average extreme snow depth cm (inches) 1 (0.4) 1 (0.4) 1 (0.4) 0 (0) 0 ...