Full ecoregional plan - Conservation Gateway
Full ecoregional plan - Conservation Gateway Full ecoregional plan - Conservation Gateway
Appendix 6.Lower New England\Northern PiedmontFinal LNE-NP Aquatic Macrohabitat ClassificationStreamsStream macrohabitats will be defined based upon the concatenation of values for the followingfive variables:Size1 - headwater (link 1-5)2 - creek (link 6-30)3 - small river (link 31-450)4 - large river (link >450)Hydrologic regime1 – unstable (elaborate rules based on watershed geology and stream size)2 – stable (elaborate rules based on watershed geology and stream size)Chemistry1 – calcareous/neutral (elaborate rules based on watershed geology and stream size)2 – acidic (elaborate rules based on watershed geology and stream size)Downstream connectivity1 – headwater/creek (link 1 – 30)2 – small river (link 31 – 450)3 – large river (link 451 and greater)4 – lake/wetland5 – coastalGradient1 –
Appendix 6.Lower New England\Northern PiedmontFinal LNE-NP Aquatic Macrohabitat Classification2 – acidicSize1 – 1 - 10 ha2 – 11 – 100 ha3 – 101 – 1000 ha4 - >1000 haShoreline complexityFour classes, (round , elongate, complex, very complex), based upon Shoreline Complexity Index,will be used. Class intervals will be the same as used in Great Lakes Pilot Project.Shoreline Complexity Index =Perimeter2 Π∗ Area1 – round = .97-1.022 – elongate = 1.03 – 2.033 – complex = 2.04 – 4.004 – very complex = >4.00Network positionHydrologic regime inferred from GIS flow accumulation model (low, moderate and high) andconnectivity (unconnected, outlet only, inlets and outlets). Ranges for flow accumulationcategories will be assigned after flow accumulation analysis has been completed and the statisticaldistribution of data examined. Nine combinations are possible as follows:Flow AccumulationConnectivity1. a. Low Unconnectedb. Low Outlet Onlyc. Low Inlet and Outlet2. a. Moderate Unconnectedb. Moderate Outlet Onlyc. Moderate Inlet and Outlet3. a. High Unconnectedb. High Outlet Onlyc. High Inlet and OutletElevationThis variable may be useful... we can do this pretty easily, so let’s just get an absolute number anduse later if necessary.9/20/00 CONFIDENTIAL DRAFT 2
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Appendix 6.Lower New England\Northern PiedmontFinal LNE-NP Aquatic Macrohabitat Classification2 – acidicSize1 – 1 - 10 ha2 – 11 – 100 ha3 – 101 – 1000 ha4 - >1000 haShoreline complexityFour classes, (round , elongate, complex, very complex), based upon Shoreline Complexity Index,will be used. Class intervals will be the same as used in Great Lakes Pilot Project.Shoreline Complexity Index =Perimeter2 Π∗ Area1 – round = .97-1.022 – elongate = 1.03 – 2.033 – complex = 2.04 – 4.004 – very complex = >4.00Network positionHydrologic regime inferred from GIS flow accumulation model (low, moderate and high) andconnectivity (unconnected, outlet only, inlets and outlets). Ranges for flow accumulationcategories will be assigned after flow accumulation analysis has been completed and the statisticaldistribution of data examined. Nine combinations are possible as follows:Flow AccumulationConnectivity1. a. Low Unconnectedb. Low Outlet Onlyc. Low Inlet and Outlet2. a. Moderate Unconnectedb. Moderate Outlet Onlyc. Moderate Inlet and Outlet3. a. High Unconnectedb. High Outlet Onlyc. High Inlet and OutletElevationThis variable may be useful... we can do this pretty easily, so let’s just get an absolute number anduse later if necessary.9/20/00 CONFIDENTIAL DRAFT 2
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