Hydrology Report
Hydrology is a branch of science that studies the water on Earth, including where it is found, how it moves, and what it's like. The water cycle, also known as the hydrologic cycle, is the never-ending process by which water evaporates from oceans and other bodies of water, rises up into the atmosphere, falls back down to Earth as rain or snow, and then returns to the oceans and other bodies of water to begin the cycle again. Hydrologists are interested in all the ways that water moves through the environment, including in the air, on the ground, and underground. There are many different paths that water can take, from being frozen in ice caps to flowing in rivers to seeping into the ground.
A watershed, basin, and region are related concepts that help us understand how water moves through an area. A watershed is an area of land where all the water that falls on it flows to a common outlet, such as a river or lake. A basin is a larger area of land that includes many watersheds and is defined by the way water flows through it. A region is an even larger area that may contain many basins and watersheds
Geographic Classification
| Name | Level | Digits | Avg Sq Miles |
| Region | 1 | 2 | 177,560 |
| Subregion | 2 | 4 | 16,800 |
| Basin | 3 | 6 | 10,596 |
| Watershed | 4 | 8 | 700 |
A hydrologic unit code is a sequence of numbers or letters that identify a hydrological feature like a river, stream, snow covered area, or a watershed. The USGS maintains a hierarchical system of hydrologic units broken up into regions, sub-regions, accounting units, and cataloging units. Each hydrological area has its own Hydrologic Unit Code (HUC). View hydrology reports by HUC code to get a closer look at river and snow conditions across the US.
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