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Watermark
* appear frequently in paper used in stamp printing.
* are a type of steganography, wherein a message is hidden within another message
  - images that are imprinted into the page of many stationary companies
  - invisible seals applied to electronic documents to attest their origin
  - markers
  - most common on woody vegetation
* are useful in determining the age of paper and hence a print's authenticity
  - maker of the paper and the place of manufacture
* can be perceptible to the naked eye, imperceptible, or a combination of both.
* help provide protection against forgery.

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Watershed
* All watersheds run into drainage basins, which, in turn, flow into the ocean.
* Every watershed reflects the land it drains.
* Many watersheds contain both private and common land.
* Some watersheds have plenty of clean water with many types of fish and mussels in the rivers
  - never recover from years of pit dewatering
  - show high rates of vegetation change, while others are low
  - suffer more from agricultural pollutants and others from urban sources
* absorb rain and recharge underground aquifers.
* are also where our children play and families go boating and fishing
  - an integral component of aquatic and terrestrial ecosystems
* are areas of land that drain to a common river, stream or lake
  - that people associated with
  - creeks, streams and rivers
  - far more complex than just streams and rivers
  - important physical features of the Interior Columbia Basin
  - inherently interdisciplinary-they are crucibles of human activity
  - land areas that drain into a single river system
  - landforms surrounded by mountains that serve as a basin to drain a river system
  - lands drained by a common surface water body
  - large areas where water drains into a single river or water body
  - lines
  - logical associations for holistic ecosystems
  - natural things
* are nature's boundaries
  - way of dividing up the landscape
  - regions draining into rivers, river systems or other bodies of water
  - simply the land area in which water is captured and converged
  - terrestrial features of landscapes that contribute water to a lake or stream
  - the barometers of the health of the land
* are the basic building blocks of the natural environment
  - the natural world
  - organizing principals of bioregions
  - topographic bowls into which streams and rivers drain
* come in all shapes and sizes, but they all have one thing in common
  - sizes, and large ones contain many smaller ones
  - many different shapes and sizes and have many different features
* comprise both ecological and human communities.
* consist of distinct ecological, natural, economic and social features.
* drain smaller areas of land around a smaller river, stream or lake.
* drainage basin in which all drainages drain at common point.
* fall into four broad categories when comparing yields to general land use.
* have distinct physical boundaries and define the ranges of plants and animals.
* is the entire system of water flow and source.
* occur in all different shapes and sizes.
* provide habitat for thousands of species of fish, wildlife, and plants.
* vary in size from just a couple of acres to thousands of square miles

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Healthy watershed
* are critical to healthy rivers
  - essential to health, diverse wildlife
* are vital for a healthy environment and economy
  - for our children and aquatic life
* mean healthy people.

Stable watershed
* are the ultimate production systems for all animals, their food and shelter.
* help maintain cool temperatures and minimize silt to the benefit of the species.

Watershed planning
* involves the preparation of comprehensive watershed management plans.
* is an important part of ecosystem-based management.