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  2. Flood insurance rate map - Wikipedia

    en.wikipedia.org/wiki/Flood_Insurance_Rate_Map

    These FIRMs are used in identifying whether a land or building is in flood zone and, if so, which of the different flood zones are in effect. In 2004, FEMA began a project to update and digitize the flood plain maps at a yearly cost of $200 million. The new maps usually take around 18 months to go from a preliminary release to the final product.

  3. North American Vertical Datum of 1988 - Wikipedia

    en.wikipedia.org/wiki/North_American_Vertical...

    NAVD 88 was established in 1991 by the minimum-constraint adjustment of geodetic leveling observations in Canada, the United States, and Mexico.It held fixed the height of the primary tide gauge benchmark, referenced to the International Great Lakes Datum of 1985 local mean sea level (MSL) height value, at Rimouski, Quebec, Canada.

  4. Muskingum Watershed Conservancy District - Wikipedia

    en.wikipedia.org/wiki/Muskingum_Watershed...

    The Muskingum Watershed Conservancy District (MWCD) is a political subdivision of the State of Ohio organized in 1933 to develop and implement a plan for flood reduction and water conservation in the Muskingum River watershed, the state's largest wholly contained watershed, covering more than 8,000 square miles (21,000 km 2). Since the original ...

  5. EPSG Geodetic Parameter Dataset - Wikipedia

    en.wikipedia.org/wiki/EPSG_Geodetic_Parameter...

    EPSG Geodetic Parameter Dataset (also EPSG registry) is a public registry of geodetic datums, spatial reference systems, Earth ellipsoids, coordinate transformations and related units of measurement, originated by a member of the European Petroleum Survey Group (EPSG) in 1985.

  6. State Plane Coordinate System - Wikipedia

    en.wikipedia.org/wiki/State_Plane_Coordinate_System

    One new feature will be a state-wide zone for projects that extend over more than one zone. [2] The NGS expects to release the new spatial reference system and new zones in 2025. [ 3 ] As with earlier systems, the name of the new system, State Plane Coordinate System of 2022, indicates a year earlier than the actual year of release.

  7. Flood watch issued for northern Ohio as heavy rain and snow ...

    www.aol.com/news/flood-watch-issued-northern...

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  8. Flood opening - Wikipedia

    en.wikipedia.org/wiki/Flood_opening

    Most regulatory authorities in the United States that offer requirements for flood openings define two major classes of opening: [1] engineered, and non-engineered. The requirements for non-engineered openings are typically stricter, defining necessary characteristics for aspects ranging from overall size of each opening, to allowable screening or other coverage options, to number and ...

  9. Big Darby Creek - Wikipedia

    en.wikipedia.org/wiki/Big_Darby_Creek

    Big Darby Creek is a scenic river located in northwestern central Ohio, and an important tributary to the Lower Scioto River. The river's major tributary is the Little Darby Creek . The river runs 84 miles (135 km) from its source near the Champaign - Union county line, south-east through Union and Madison Counties.

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