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what s an rpw

RECOMMENDATION. Rapanos - Intermittent streams having 3 month continuous flowsPiedmont Area

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what s an rpw

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    1. Whats an RPW? Piedmont Variety

    2. RECOMMENDATION Rapanos - Intermittent streams having 3 month continuous flows Piedmont Area Most consultants contend Intermittent = RPW NC Methodology Recommended

    4. The Methodology evaluating 29 different attributes of the stream and assigning a numeric score to each attribute Absent, Weak, Moderate, and Strong are applied to sets of geomorphic, hydrologic and biological attributes.

    5. SCORING Absent The character is not observed Weak The character is present but you have to search intensely(i.e., ten or more minutes) to find it Moderate The character is present and observable with mild (i.e.,one or two minutes) searching Strong The character is easily observable

    6. Geomorphology Continuous bed and bank Sinuosity In-channel structure: riffle-pool sequence Soil texture or stream substrate sorting Active/relic floodplain Depositional bars or benches

    7. Geomorphology (Cont) Braided channel Recent alluvial deposits Natural levees Headcuts Grade controls Natural valley or drainageway Second or greater order channel on existing USGS or NRCS map or other documentedevidence.

    8. Hydrology Groundwater flow/discharge Water in channel and > 48 hrs since rain, or Water in channel -- dry or growing season Leaflitter Sediment on plants or debris Organic debris lines or piles (Wrack lines) Hydric soils (redoximorphic features) present?

    9. Biological Fibrous roots in channel Rooted plants in channel Crayfish Bivalves Fish Amphibians Macrobenthos (note diversity and abundance)

    10. Biological (Cont) Filamentous algae; periphyton Iron oxidizing bacteria/fungus. Wetland plants in streambed

    11. Perennial Stream Indicators fish, crayfish (in channel), amphibians (larval salamanders and large, multi-year tadpoles), or clams or If only crayfish or fingernail clams - 18 on the geomorphology section OR 30 points OR > one benthic macroinvertebrate that requires water for life cycle are present as later instar larvae

    12. Intermittent Criteria 19 points value to classify a stream as at least intermittent.

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