Dissolved Oxygen

Dissolved oxygen (DO) is a water quality parameter that can give insight into the health of a lake, river, or the ocean.  Dissolved oxygen is a measure of gaseous oxygen dissolved in an aqueous solution.  Oxygen can get into solution via a few mechanisms, including...

Tributary

A TRIBUTARY is a freshwater stream that feeds into a larger stream, river, or other body of water.  The larger body of water that a tributary flows into is called the mainstem.  Tributaries do not flow directly into the ocean. The map above shows the Salmon Falls...

Estuary

An ESTUARY is a partially enclosed, coastal body of water where a river meets the ocean.    Estuaries are transition zones between fresh river environments and saline ocean environments.  Estuaries are subject to the tides, waves, and changes in salinity based on...

Point and Non-point Source Pollution

Point Source and Nonpoint Source Pollution are the two broad categories of pollution in watersheds.  Lets start with point source pollution. Point Source Pollution can be identified as pollution from a specific spot.  A drain pipe leading out of a building and...

Watershed

The word “watershed” is used all the time in water related discussions or settings.  We are all guilty of using words that come with our own line of work and not explaining them, so in this section we will aim to define and explain some words related to...

Reservoir

A reservoir can be a pond, lake or basin, either natural or artificial, for the storage, regulation and control of water.  Reservoirs can also include aquifers where groundwater is stored. At AWWA we look to create reservoirs when we install our Best Management...