Name: Subwatershed Summary

Display Field: HUC12Name

Type: Feature Layer

Geometry Type: esriGeometryPolygon

Description: <DIV STYLE="text-align:Left;"><DIV><DIV><P><SPAN>This layer is intended to provide estimates of nonpoint sources on the subwatershed level. These include estimates of livestock agriculture (such as livestock numbers and manure land-application area), the number of on-site septic systems, lost wetland, natural riparian buffers, and the amount of land that is covered by impervious surfaces. Each nonpoint source indicator (or stressor) is given a category based on how the subwatershed compares with all other subwatersheds in the entire state (e.g. a subwatershed that is marked as "high" for impervious surfaces would have a high amount of impervious surface relative to the state median value). </SPAN></P><P><SPAN>Land cover (NOAA, 2011), population and housing unit data (US Census Bureau, 2010 and 2012), agricultural census data (USDA, 2014), lost wetland (Fizzell, 2015), and septic system information are summarized for each 12-digit HUC level subwatershed in Michigan. The number of hogs and cattle, and the percent of agricultural land that has manure land-applied or tiled, are estimates derived from county-based agricultural census data. These county-level data were then distributed geographically across all agricultural land cover in that county (assuming even distribution or impact of the livestock across agricultural land), then intersected with subwatersheds to obtain a population estimate. The number of septic systems are estimates and should also be verified locally. Septic systems were estimated by determining the number of housing units in census blocks that were served by sanitary sewers, and assuming that the remainder relied on residential septic systems. The number of housing units served by sanitary sewers was estimated from permit applications on file in EGLE's MiWaters database and files (collection system maps, shapefiles where available from the permittee, and/or estimates of population served). Natural riparian buffer coverage is a percent of stream miles with a 30 meter natural vegetation buffer, and was created by buffering the stream hydrography layer and intersecting the buffer with forested and wetland 2011-era land cover.</SPAN></P></DIV></DIV></DIV>

Copyright Text: Molly Rippke, Water Resources Division, Michigan Department of Environment, Great Lakes, and Energy (EGLE). Fizzell, C. (2015). Status and Trends of Michigan’s Wetlands: Analysis of Wetland Quantity and Quality Pre-European Settlement to 2005. , Michigan Department of Environmental Quality. EGLE MiWaters Database. https://miwaters.deq.state.mi.us/miwaters/external/home NOAA (2011). NOAA Coastal Change Analysis Program (C-CAP) Zone 51 (lower) 2011-Era Land Cover. Charleston, SC. National Oceanic and Atmospheric Administration. Accessed 2014. U.S. Census Bureau (2010). "Michigan TIGER/Line Shapefiles. 2010 Census Block Polygons for the State of Michigan. ." U.S. Census Bureau (2012). Census of Population and Housing, 2010 [United States]: Redistricting Data (Public Law 94-171) Summary File. USDA (2014). 2012 Census of Agriculture- Michigan State and County Data. , United States Department of Agriculture - National Agricultural Statistics Service.

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Supported Query Formats: JSON, geoJSON, PBF

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Spatial Reference: 102100  (3857)

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Type ID Field: null

Fields:

• OBJECTID ( type: esriFieldTypeOID, alias: OBJECTID )
• HUC12 ( type: esriFieldTypeString, alias: Hydrologic Unit Code, length: 12 )
• HUC12Name ( type: esriFieldTypeString, alias: Subwatershed Name:, length: 80 )
• TotalArea ( type: esriFieldTypeDouble, alias: Total Area (Square Miles) )
• WetlandsLost ( type: esriFieldTypeString, alias: Wetland Lost (% Presettlement ), length: 254 )
• PercentImpervousSurfaces ( type: esriFieldTypeString, alias: Impervious Surfaces (%), length: 254 )
• EstimatedNumberOfHogs ( type: esriFieldTypeString, alias: Estimated Number Of Hogs, length: 254 )
• EstimatedNumberOfCattle ( type: esriFieldTypeString, alias: Estimated Number Of Cattle, length: 254 )
• PopulationWithinHUC12 ( type: esriFieldTypeString, alias: Population, length: 254 )
• HouseingUnits ( type: esriFieldTypeString, alias: Number of Housing Units, length: 254 )
• EstimatedNumberOfSepticSystems ( type: esriFieldTypeString, alias: Estimated Number Of Septic Systems, length: 254 )
• AreaOfTiledAgriculturalLandSqua ( type: esriFieldTypeString, alias: Area Of Tiled Agricultural Land (Square Miles), length: 254 )
• AreaOfManureApplicationSquareMi ( type: esriFieldTypeString, alias: Area Of Manure Application (Square Miles), length: 254 )
• PercentOfVegetatedBuffer ( type: esriFieldTypeString, alias: Natural Riparian Buffer (%), length: 254 )
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Supported Operations:   Query   Query Attachments   Query Analytic   Generate Renderer   Return Updates

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