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Intermittent streams are those that have a well defined channel but maintain only seasonal flow under typical climatic conditions. This includes natural streams that have been altered by dredging and/or straightening (see Canal Section). For all intermittent streams, the Stringer is required. The total SMZ for intermittent streams consists of the Stringer, which occupies the immediate stream bank, and the Secondary Zone. The Secondary Zone, like the Primary Zone, is measured from the stream, beginning at the break in slope at the top of the stream bank, out to the designated width. In addition, where the stream is connected to the inflow and/or discharge point of a flowing wetland, the Zone extends an additional 50 feet beyond the defined channel into the wetland (Figure 4).
All intermittent waterbodies are afforded a Stringer and a Secondary Zone of at least 35 feet, regardless of the SSC. However, depending on the SSC, an intermittent stream could have a Secondary Zone as wide as 300 feet (Appendix 1). Figure 2 shows examples of Secondary Zones on several different intermittent streams, each with a different SSC. Note that the total SMZ is composed of the Stringer and the Secondary Zone - no Primary Zone applies to intermittent streams.
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