Hydrography

Streams and rivers

Streams and rivers [USGS version]

This map shows the rivers and streams on the islands in Chuuk Lagoon as represented on the U.S. Geological Survey (USGS) 1:25,000-scale topographic maps (1996-1997). The dataset was extracted from the Digital Line Graphs (DLGs) from USGS and names from the Geographic Names Information System (GNIS) by Island Research & Education Initiative (iREi) (2020) and slightly modified to match the new base layer.

Natural outflow points

This map shows the natural outflow locations on the islands in Chuuk Lagoon, defined as points where streams and rivers discharge into the lagoon. The dataset was created by Island Research & Education Initiative (iREi) (2020) by identifying the points where streams and rivers from 1:25,000-scale U.S. Geological Survey topographic maps (1996-1997) intersect with the most recent shoreline of Chuuk. Please note that the points are somewhat arbitrary and approximate because many streams discharge into mangrove areas rather then directly into the lagoon and lack particular channels or single outflow locations.

Waterfalls

This map shows the locations of waterfalls on the islands in Chuuk Lagoon. The data layer was created by Island Research & Education Initiative (iREi) (2020), using field observations and information provided as KML files by Nely Mori Ruben (Chuuk Visitors Bureau).

Modeled streamflow

Flow paths

This map shows the theoretical drainage pattern on the islands in Chuuk Lagoon. The flow paths were delineated by Island Research & Education Initiative (iREi) (2020). This was done by Maria Kottermair through hydrological modeling using a 10-meter Digital Elevation Model (DEM) created by U.S. Geological Survey based on topography compiled in 1968. Note that in very flat low-lying areas the data may indicate straight lines that are an artifact of the modeling process and do not reflect reality.

Flow accumulation

This map shows the flow accumulation on Yap. Flow accumulation describes the amount of water in streams. The higher the value, the more water a particular location receives from areas uphill. The dataset was created by Island Research & Education Initiative (iREi) (2019). This was done by Maria Kottermair (iREi) through hydrological modeling using a 10-meter Digital Elevation Model (DEM) by U.S. Geological Survey based on topography compiled in 1969. Note that in very flat low-lying areas the data may indicate straight lines that are an artifact of the modeling process and do not reflect reality.

Modeled drainage basins

Principal watersheds

This map shows the principal watersheds (drainage basins) on the islands in Chuuk Lagoon. The dataset was created by Island Research & Education Initiative (iREi) (2020). Basin boundaries were delineated by Maria Kottermair through hydrological modeling using a 10-meter Digital Elevation Model (DEM) created by U.S. Geological Survey based on topography compiled in 1968. Note that basin boundaries shown are modeled and, as such, reflect the DEM and not necessarily actual situation on the ground. The watershed boundaries may differ from actual management units, especially as smaller basins were sometimes merged to a ‘principal’ watershed to avoid too many small remnant basins.

Sub-watersheds

This map shows the principal watersheds (drainage basins) and their sub-watersheds on the islands in Chuuk Lagoon. The dataset was created by Island Research & Education Initiative (iREi) (2020). All boundaries were delineated by Maria Kottermair through hydrological modeling using a 10-meter Digital Elevation Model (DEM) created by U.S. Geological Survey based on topography compiled in 1968. Note that apparently unnatural boundaries such as series of straight, parallel lines are artifacts of modeling and do not reflect reality.

Water resources

Freshwater sources [springs and shallow wells]

This map shows the general distribution of freshwater resources on Pohnpei. The data layer was created by Island Research & Education Initiative (iREi) (2017) by scanning, georeferencing, and digitizing a very general paper map prepared by the U.S. Geological Survey (1944) for the Chief of Engineers, U.S. Army as part of the Strategic Engineering Study No. 109 titled Ponape including Pakin and Ant Islands (Carolines) Terrain Intelligence. The map was found in the library collection at the national campus of the College of Micronesia (COM).

Weather and climate

Monitoring

Gaging stations

This map shows the locations of the U.S. Geological Survey gaging stations on Weno and Tonoas islands. The dataset was extracted by Island Research & Education Initiative (iREi) (2020) from Digital Line Graphs (DLGs). The DLGs were created by U.S. Geological Survey for the 1:25,000-scale topographic maps (1996-1997).

Weather stations

This map shows the location of the active weather observation sites on the islands in Chuuk Lagoon. The data layer was created by Island Research & Education Initiative (iREi) (2020) using location information obtained from the National Weather Service office in Guam.

chuuk Maps: water

Hydrography

Streams and rivers

Streams and rivers [USGS version]

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Natural outflow points

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Waterfalls

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Modeled streamflow

Flow paths

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Flow accumulation

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Modeled drainage basins

Principal watersheds

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Sub-watersheds

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Water resources

Water resources

Freshwater sources [springs and shallow wells]

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Weather and climate

Monitoring

Gaging stations

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Weather stations

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