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Eastside Type N Riparian Effectiveness Project
ENREP - FHS ExtensionFebruary 5, 2015
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Why the FHS Extension
2. Modify the westside Type N study designs for the eastside and proceed with the study in basins with spatially-continuous Np streams.
The variability in hydrologic condition and extent of dry Np channels led to a two-part recommendation from the TWIG for ENREP study design development.
November 2013: Policy approved this recommendation, and expressed an interest in seeing a single study design applied to all eastside basins, if feasible.
1. Extend FHS to learn more about the distribution and persistence of dry reaches.
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FHS Extension products
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Variation in hydrologic condition
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Isolated Channels
• Isolated channels were identified by the lack of a channel connection to the downstream network.• These breaks in channel connectivity occurred where an
upstream channel ended in a section of unchanneled hillslope.
• Lack of channel connectivity interrupted surface water transport of water, material, biota, and thermal energy.
• Some basins contained no isolated Np. In some others there was no channel at the outlet, so the entire channel network was isolated.
• Np channels that were both dry and isolated comprised 2%-4% of the total channel network.
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Association with potential Np buffer zones
11% (0.5%) Isolated: 3% (0.14%)
29% (1.3%) Isolated: 7% (0.31%)
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Key findingsIn the drier FHS basins (>500 feet of dry Np):
• 35% of the Np channel length was dry in late summer (FHS: 21% was dry).
• 12% of the Np channel length was dry in late spring.
• 70-75% of dry Np channels have a channel connection to downstream waters beyond the basin outlet (FHS: 77%).• Important for the delivery of material and energy to the fish-
bearing network.
• Stream hydrologic condition is generally stable within seasonal drying patterns. Therefore, a single ENREP study design is feasible.
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Next steps• Prepare the FHS Extension report.
• In close cooperation with landowners, develop a single study design to test the effectiveness of current FP Type N rules.• Determine study basin characteristics
• Size, hydrologic condition, distribution, etc.
• Determine type and scale of harvest• Identify at least 20 study basins• Number of treatment types and overall success
depend on availability of study basins.
• Collect pre-harvest data in spring 2016 – 2017.
• Apply the designed harvest in fall 2018 – 2019.