hydrology

Screenshot showing a watershed boundary with lines showing the density of water flow on top of a base map.

How to Use ArcGIS Pro to Map Watersheds

Jeff Oppong

This tutorial shows you how to use ArcGIS Pro to delineate watersheds and drainage paths from elevation data.

Top is an aerial of a section of Long Island City and bottom is a city map of the same section from 1879. The historical map has muted pinks and greens for the different areas and show streets and the river.

Lost Underground Rivers

Mark Altaweel

Cities like London and New York City have a long history of paving over rivers.

A sign marking the location of the North American Continental Divide in Yellowstone National Park. Photo: NPS, public domain.

North American Continental Divide

Elizabeth Borneman

The North American Continental Divide separates the watersheds that flow into the Pacific Ocean and those that flow into the Gulf of Mexico and the Atlantic, Caribbean, and Arctic Oceans.

Three different GIS datasets were used to create the Global Subnational River Borders. Source: Popelka and Smith, 2020.

Rivers as Borders: GIS Dataset Available

Caitlin Dempsey

The Global Subnational River Borders GIS dataset is freely available.

Haloarchaea are salt-loving microorganisms that impart the pink and red colors of Lake Natron in Tanzania. Image: Landsat 8 acquired March 6, 2017.

This Lake is Home to the Highest Concentrations of Lesser Flamingos in East Africa

Caitlin Dempsey

The protective salt marshes that ring Lake Natron in Tanzania have nurtured the highest concentrations of lesser and greater flamingos in East Africa.

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