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- A. Defining the Mean High Tide Line California law provides that the State owns all land below the “ordinary high water mark.”6 The “ordinary high water mark” is to be determined by the average height of all high tides at a given location over a period of 18.6 years.7 This is referred to as the mean high water mark, or MHTL.
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The Commission is the recognized authority for determining the location of the ordinary high water mark in California. The United States Supreme Court has ruled that in tidal areas the boundary is to be located by identifying the intersection of the mean high tide line with the shore ( Borax Consol., Ltd v.
Mean Higher-High Water: MHW: Mean High Water: MTL: Mean Tide Level: MSL: Mean Sea Level: DTL: Mean Diurnal Tide Level: MLW: Mean Low Water: MLLW: Mean Lower-Low Water: STND: Station Datum: GT: Great Diurnal Range: MN: Mean Range of Tide: DHQ: Mean Diurnal High Water Inequality: DLQ: Mean Diurnal Low Water Inequality: HWI: Greenwich High Water ...
Mean High Water. The average of all the high water heights observed over the National Tidal Datum Epoch. For stations with shorter series, comparison of simultaneous observations with a control tide station is made in order to derive the equivalent datum of the National Tidal Datum Epoch. DTL.
The MHW line is 4.65 feet (1.416 meters) above the Mean Lower Low Water line (MLLW) as shown on the tidal datum publication. Establishing this elevation will determine the boundary. For example, if NGVD 29 is being used, the difference between NGVD 29 and MLLW is 2.72 feet. Therefore 4.65 – 2.72 = 1.93 feet.
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The mean high water line (MHWL) or mean higher high water line (MHHWL) when tidal lines are used as the coastal boundary. Also, lines used as boundaries inland of and measured from (or points thereon) the MHWL or MHHWL.
Describe how to locate, in the field, the mean high tide line when it is defined at the survey site as 4.73 ft above mean lower low water. The equation between mean lower low water and NGVD at the site is 1.89 ft, and the location is along the California coast. 14.
May 9, 2016 · Mean High High Water. Mean High Water. Mean Low Low Water. States use various tidal datums to delineate shorelines and jurisdictional boundaries, which serve many legal, technical, and general uses. The above graphic shows some of the tidal datums commonly used to define shorelines and boundaries.
