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Stream Management Corridors (SMCs) within the Mile High Flood District (MHFD) Boundary. SMC boundaries are a rough estimate of the space needed for a highly functional stream design and reduced maintenance expense. |
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Stream Management Corridors (SMCs) within the Mile High Flood District (MHFD) Boundary. SMC boundaries are a rough estimate of the space needed for a highly functional stream design and reduced maintenance expense. |
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River Works, MHFD |
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5000 |
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<DIV STYLE="text-align:Left;"><DIV><DIV><P><SPAN>Stream Management Corridors (SMCs) are the general corridors needed to allow a stream to function in a way that replicates natural processes to the extent possible. Stream Management Corridors should be considered when developing a site plan at the earliest stages of land planning or planning for a stream restoration project.</SPAN></P><P><SPAN>This SMC dataset is based on a floodplain-based regression analysis. MHFD staff identified SMCs on both the eastern and western sides of the District’s service area where the previous shear stress-based method (released in 2019) produced unrealistic SMC widths. To improve accuracy, MHFD updated these SMCs using the revised floodplain-based approach. Last updated: 6/21/2025</SPAN></P><P><SPAN>This is the first release of stream management corridors following the regression-based approach and should be used in place of the </SPAN><A href="https://mhfd.maps.arcgis.com/home/item.html?id=a84967309d104b579c67c12647cb1328" target="_blank" STYLE="text-decoration:underline;"><SPAN>legacy shear stress based stream management corridors.</SPAN></A></P><P><SPAN>SMCs depicted in dark green were developed using a very high level GIS desktop analysis based on a floodplain-based regression analysis. These are intended to be a starting point for planning purposes only, with refinement occurring through project design in combination with a more detailed science-backed methodology based on current practices.</SPAN></P><P><SPAN>SMCs depicted in light green were developed using a field visit confirmed, peer reviewed, detailed analysis of the stream corridor. This may be fulfilled by a Fluvial Hazard Zone study or other scientifically defensible methods.</SPAN></P><P><SPAN>SMCs are still under development for streams not showing an associated corridor.</SPAN></P><P><SPAN>For more information about stream management corridors and flood hazard zones, visit the </SPAN><A href="https://www.coloradofhz.com/" target="_blank" STYLE="text-decoration:underline;"><SPAN>Colorado Flood Hazard Zone Mapping Program website. </SPAN></A></P></DIV></DIV></DIV> |
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<DIV STYLE="text-align:Left;"><DIV><DIV><P><SPAN>The regression-based SMCs included in this dataset are used to describe approximate and continuous relationships between watershed area and floodplain width. These are intended to be a starting point for planning purposes only, with refinement occurring through project design. </SPAN></P><P><SPAN>The regression relationships are based on watershed specific floodplain (valley bottom) data; however, given the approach, they will not account for human-made structures or local geomorphic variability. They are not to be construed or used as a regulatory tool. Further, floodplain and valley bottom widths within urban areas that reflect the broader geomorphic floodplain are inherently difficult to ascertain; therefore, the linkage between topographic data and floodplain widths in channelized streams is limited and will require refinement over time.</SPAN></P></DIV></DIV></DIV> |
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Stream Management Corridors |
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["smcs","stream management corridors","geomorphology","mhfd"] |
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en-US |
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5000000 |
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