Key F-2.  Key to Water Flow Paths

1.  Water flow is tidally influenced.........2

1.  Water flow is not under the influence of the tides.........4

2. Tide range is greater than 4m (approx. >12 feet) ....................................................Macrotidal 2. Tidal range is less than 4m........3


3. Tidal range is 2-4m (approx. 6-12 feet) .....................................................................Mesotidal

3. Tidal range is less than 2m (approx. < 6 feet) ...........................................................Microtidal


4. Water flows out of the waterbody via a river, stream, or ditch, with little or no inflow (inflow could be from intermittent streams or ground water only) ................................................Outflow


Modifier: Human-caused for inflow via a ditch network. Might consider separating perennial outflow (Outflow-perennial) from intermitttent outflow (Outflow- intermittent), if interested.


  1. Water flow is not so.        5


  1. Water enters waterbody from river, stream, or ditch, flows through it, and continues to flow downstream..............................................................Throughflow or Throughflow-intermittent


Modifier: Human-caused for throughflow via a ditch network Note: Throughflow intermittent is applied to intermittent streams

  1. Water flow is not throughflow.        6


  1. Water flows in and out of the waterbody through the same channel; it does not flow through the waterbody...........................................................................................Bidirectional-nontidal


  1. Water flow is not bidirectional.        7


  1. Water flow enters via a river, stream, or ditch, but does not exit pond, lake or reservoir; waterbody serves as a sink for water...................................................................................Inflow


Modifier: Human-caused for inflow via a ditch network.


7. No apparent channelized inflow, source of water either by precipitation or by underground sources.............................................................................................................................Isolated


Attention: In most applications, isolation is interpreted as "geographically isolated" since groundwater connections are typically unknown for specific waterbodies. For practical purposes then," isolated" means no obvious surface water connection to other wetlands and


waters. If hydrologic data exist for a locale that document groundwater linkages, such waterbodies should be identified as either outflow. inflow, or throughflow with a "Groundwater- dominated" modifier added and not be identified as isolated unless the whole network of waterbodies is not connected to a stream or river. In the latter case, the network is a collection of interconnected isolated waterbodies.


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