| snippet:
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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. |
| summary:
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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. |
| extent:
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[[-105.504380635021,37.9056220534477],[-98.0660656844177,40.1516086828078]] |
| accessInformation:
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River Works, MHFD |
| thumbnail:
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thumbnail/thumbnail.png |
| maxScale:
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1.7976931348623157E308 |
| typeKeywords:
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["ArcGIS","ArcGIS Server","Data","Map Service","Service"] |
| description:
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<DIV STYLE="text-align:Left;font-size:12pt"><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 /></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 /></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" STYLE="text-decoration:underline;"><SPAN>legacy shear stress based stream management corridors</SPAN></A><SPAN>. </SPAN></P><P><SPAN /></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 /></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 /></P><P><SPAN>SMCs are still under development for streams not showing an associated corridor.</SPAN></P><P><SPAN /></P><P><SPAN>For more information about stream management corridors and flood hazard zones, visit the </SPAN><A href="https://www.coloradofhz.com/" STYLE="text-decoration:underline;"><SPAN>Colorado Flood Hazard Zone Mapping Program website</SPAN></A><SPAN>. </SPAN></P></DIV></DIV></DIV> |
| licenseInfo:
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<DIV STYLE="text-align:Left;font-size:12pt"><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 /></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> |
| catalogPath:
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|
| title:
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StreamManagementCorridors |
| type:
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Map Service |
| url:
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|
| tags:
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["smcs","stream management corridors","geomorphology","mhfd"] |
| culture:
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en-US |
| portalUrl:
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|
| name:
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StreamManagementCorridors |
| guid:
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65BD3ADB-FF97-425A-B830-4ED6C8617CED |
| minScale:
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0 |
| spatialReference:
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WGS_1984_Web_Mercator_Auxiliary_Sphere |