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  2. Hydrologic unit system (United States) - Wikipedia

    en.wikipedia.org/wiki/Hydrologic_unit_system...

    The 10-digit watersheds were delineated to be between 40,000 and 250,000 acres in size, and the 12-digit subwatersheds between 10,000 and 40,000 acres. [5] In addition to the hydrologic unit codes, each hydrologic unit was assigned a name corresponding to the unit's principal hydrologic feature or to a cultural or political feature within the ...

  3. Mill Creek, Puslinch - Wikipedia

    en.wikipedia.org/wiki/Mill_Creek,_Puslinch

    The subwatershed plan itself is a robust document that covers 6 main topics: public consultation approach (Section 2); description of physical resources (Section 3); functional assessment and greenspace system (Section 4); potential impacts of future development (Section 5); analysis of other subwatershed issues; and the Mill Creek Subwatershed ...

  4. Bathymetric chart - Wikipedia

    en.wikipedia.org/wiki/Bathymetric_chart

    The use of bathymetry and the development of bathymetric charts dates back around the 19th century BC to ancient Egypt.Depictions on tomb walls such as the bas-relief carvings of Deir al-Bahri commissioned by Queen Hatshepsut in the 16th century BC show ancient mariners using long slender poles as sounding poles to determine the depth of the Nile River and into the Nile River Delta.

  5. Paint Branch - Wikipedia

    en.wikipedia.org/wiki/Paint_Branch

    The Paint Branch subwatershed is approximately 13,287 acres (20.7 miles) in size and 18% impervious. [4] The areas along Maryland's route 29, the intersection of Sandy Spring Road, and Columbia Pike in Burtonsville, Maryland have undergone extensive commercial development. [4]

  6. Projected coordinate system - Wikipedia

    en.wikipedia.org/wiki/Projected_coordinate_system

    Since, in the UK at least, a 6-figure grid reference identifies a square of 100-metre sides, an 8-figure reference would identify a 10-metre square, and a 10-digit reference a 1-metre square. In order to give a standard 6-figure grid reference from a 10-figure GPS readout, the 4th, 5th, 9th and 10th digits must be omitted, so it is important ...

  7. Potomac River - Wikipedia

    en.wikipedia.org/wiki/Potomac_River

    The lowest average daily flow ever recorded at the same location was 601.0 cubic feet (17.02 m 3) /s in September 1966 [2] The highest crest of the Potomac ever registered at Little Falls was 28.10 ft, on March 19, 1936; [43] [28] however, the most damaging flood to affect Washington, DC and its metropolitan area was that of October 1942.

  8. Klamath Basin - Wikipedia

    en.wikipedia.org/wiki/Klamath_Basin

    According to the USGS watershed classification system, the Klamath Watershed is a 6-digit, level 3 Accounting Unit within Region 18, known as the California watershed region. [18] The accounting unit of the Klamath Watershed is 180102 and includes twelve 8-digit Hydrologic Units (HUCs) covering 9.4 million acres. [ 19 ]

  9. Gigarcanum - Wikipedia

    en.wikipedia.org/wiki/Gigarcanum

    Size comparison of the holotype (top) with Rhacodactylus leachianus. Gigarcanum delcourti is 50% longer and was likely several times heavier than the largest living gecko, the also New Caledonian Rhacodactylus leachianus, [6] with a snout-to-vent length (SVL) of 37 cm (14.6 in) and an overall length (including tail) of at least 60 cm (23.6 in). [2]