First-Order

= = = First-Order Streams = =Definition: a stream that has no permanent tributaries.= First-order streams are the uppermost perennial tributaries in the watershed which have not yet intersected another perennial stream. = =
 * First-order streams are perennial streams, which carry water all year.
 * When two first-order streams come together, they form a second-order stream.
 * First-order streams are the smallest streams in a river system.
 * 80% of the streams and rivers on the planet are first or second order.
 * First order streams are typically home to large insect populations, and obtain few, if any, fish.

** In the study area, 54% of the land area drains to first-order streams, and 53% of the total stream miles are comprised of first-order streams.

First order streams are very small in size and in flow volume, and, therefore, re much more vulnerable to impacts on water quality and quantity. **

Cited from: www.dyersburgtn.gov/stormwater/swm_**streams**.pdf

Stream Order Home Page.