Hydrography

Streams and rivers

Streams and rivers [USGS version]

This map shows the rivers and streams on Yap as represented on the U.S. Geological Survey (USGS) 1:25,000-scale topographic maps (1996). 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) (2019) and slightly modified to match the (partially) updated shoreline.

Stream outflow points

This map shows the natural outflow locations on Yap, defined as points where streams and rivers discharge into the lagoon. The dataset was created by Island Research & Education Initiative (iREi) (2019) by identifying the points where streams and rivers from 1:25,000-scale U.S. Geological Survey topographic maps (1996) intersect with the most recent shoreline of Yap.

Modeled streamflow

Flow paths

This map shows the theoretical drainage pattern on Yap. The flow paths were delineated 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.

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 Yap. The dataset was created by Island Research & Education Initiative (iREi) (2019). Basin boundaries were delineated 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 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 Yap's principal watersheds (drainage basins) and their sub-watersheds. The dataset was created by Island Research & Education Initiative (iREi) (2019). All boundaries were delineated by Maria Kottermair (iREi) through hydrological modeling using a 10-meter Digital Elevation Model (DEM) created by U.S. Geological Survey based on topography compiled in 1969. Note that apparently unnatural boundaries such as series of straight, parallel lines are artifacts of modeling and do not reflect reality.

Weather and climate

Monitoring

Gaging stations

This map shows the locations of the U.S. Geological Survey gaging stations on Yap. The dataset was extracted by Island Research & Education Initiative (iREi) (2019) from Digital Line Graphs (DLGs). The DLGs were created by U.S. Geological Survey for the 1:25,000-scale topographic maps (1996).

WAQAB (YAP PROPER) Maps: water

Hydrography

Streams and rivers

Streams and rivers [USGS version]

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Stream outflow points

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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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Weather and climate

Monitoring

Gaging stations

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