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-3- <br />Tributary is: ❑ Natural <br />❑ Artificial (man- made). Explain: <br />❑ Manipulated (man- altered). Explain: <br />Tributary properties with respect to top of bank (estimate): <br />Average width: feet <br />Average depth: feet <br />Average side slopes: �IAO, <br />Primary tributary substrate composition (check all that apply): <br />❑ Silts ❑ Sands ❑ Concrete <br />❑ Cobbles ❑ Gravel ❑ Muck <br />❑ Bedrock ❑ Vegetation. Type/0% cover: <br />❑ Other. Explain: <br />Tributary condition /stability [e.g., highly eroding, sloughing banks]. Explain: <br />Presence of run/riffle /pool complexes. Explain: <br />Tributary geometry: PkUlAt <br />Tributary gradient (approximate average slope): % <br />(c) Flow: <br />Tributary provides for: N,st <br />Estimate average number of flow events in review area/year: Pkkjbt <br />Describe flow regime: <br />Other information on duration and volume: <br />Surface flow is: kick O. Characteristics: <br />Subsurface flow: Pe I*t. Explain findings: <br />❑ Dye (or other) test performed: <br />Tributary has (check all that apply): <br />❑ Bed and banks <br />❑ OHWM6 (check all indicators that apply): <br />❑ clear, natural line impressed on the bank <br />❑ changes in the character of soil <br />❑ shelving <br />❑ vegetation matted down, bent, or absent <br />❑ leaf litter disturbed or washed away <br />❑ sediment deposition <br />❑ water staining <br />❑ other (list): <br />❑ Discontinuous OHWM.' Explain: <br />❑ the presence of litter and debris <br />❑ destruction of terrestrial vegetation <br />❑ the presence of wrack line <br />❑ sediment sorting <br />❑ scour <br />❑ multiple observed or predicted flow events <br />❑ abrupt change in plant community <br />If factors other than the OHWM were used to determine lateral extent of CWA jurisdiction (check all that apply): <br />❑ High Tide Line indicated by: ❑ Mean High Water Mark indicated by: <br />❑ oil or scum line along shore objects ❑ survey to available datum; <br />❑ fine shell or debris deposits (foreshore) ❑ physical markings; <br />❑ physical markings /characteristics ❑ vegetation lines/changes in vegetation types. <br />❑ tidal gauges <br />❑ other (list): <br />(iii) Chemical Characteristics: <br />Characterize tributary (e.g., water color is clear, discolored, oily film; water quality; general watershed characteristics, etc.). <br />Explain: <br />Identify specific pollutants, if known: <br />(iv) Biological Characteristics. Channel supports (check all that apply): <br />❑ Riparian corridor. Characteristics (type, average width): <br />❑ Wetland fringe. Characteristics: <br />❑ Habitat for: <br />❑ Federally Listed species. Explain findings: <br />6A natural or man -made discontinuity in the OHWM does not necessarily sever jurisdiction (e g , where the stream temporarily flows underground, or where <br />the OHWM has been removed by development or agricultural practices) Where there is a break in the OHWM that is unrelated to the waterbody's flow <br />regime (e g , flow over a rock outcrop or through a culvert), the agencies will look for indicators of flow above and below the break <br />'Ibid <br />