# Metrics

The FFC calculates metrics describing ecologically relevant components of the annual streamflow hydrograph. The metrics are organized into four seasonally-based functional flow components, in addition to two summary metrics (average annual flow and coefficient of variation) calculated for each water year. The FFC metrics are listed below.

## Annual

* Average annual flow
* Coefficient of variation

## Fall Pulse Flow

* Pulse magnitude
* Pulse timing
* Pulse duration

## Wet Season

* Magnitude
* Timing
* Duration

## Peak Magnitude Flows

Each of the following metrics is calculated annually for individual high flows that exceed 10-year, 5-year, and 2-year recurrence intervals of annual peak flows across the period of record:

* Magnitude
* Duration
* Frequency

## Spring Recession Flows

* Magnitude
* Timing
* Duration
* Rate of change

## Dry Season Baseflow

* Magnitude
* Timing
* Duration from start of dry season low flows until the start of the wet season of the next water year
