watershed development and drainage assessments
DESCRIPTION
Cori Cox and Jeff Corns developed this outstanding presentation.TRANSCRIPT
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GIS for Drainage AssessmentAndrew Harrison, GISP Business Development ManagerThe Schneider Corporation(317) 826-7393 [email protected]
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Overview
• Generating watershed from GIS data
• Use of calculation software to assess drainage districts with Parcel, Watershed & Soils Layers
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Accuracy…
• Fancy software does not equal accurate data
• Additional data layers will only be as accurate as basemap
• Parcels must be maintained and up-to-date through a known date– almost all GIS layers will refer back to
ownership information (in local government)
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Watersheds of the Past?
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Software
• ESRI– ArcGIS/ArcInfo– Spatial Analyst– Hydrology Modeling Extension
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Contours – 2’ Seamless
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Linear Stream Features
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Elevation Raster
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Flow Direction Raster
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Flow Accumulation Raster
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Raster Streams Layer
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Watershed Rasters
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Assumptions and Obstacles:
• 3 things to know about drainage (assumptions)– Water runs downhill
• Water drains into streams
– Payday is Friday– The boss is a jerk!
• Obstacles– “Sinks” and “Peaks”– Culverts
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“Fill” Process for Sinks and Peaks
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Streams at Culverts
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Zoomed Stream Elevation Raster
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“Burning” in the Streams
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Watershed Generation Process
• Hydrology Modeling extension is used to “burn in streams” and build watersheds using raster images created from contour data
• Computer generated watersheds are merged/attributed to match County’s existing tiered administrative watershed system
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Threshold = 500 Watersheds
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Threshold = 5000 Watersheds
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Remember these?
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Tiered Watersheds
Watersheds
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Tiered Watersheds
SubWatersheds
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Tiered Watersheds
Subsof Sub
Watersheds
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Tiered Watersheds
Subsof Subs
of SubWatersheds
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Tiered Watersheds
Subsof Subsof Subsof Subs
Watersheds
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What can I do with this watershed data?
• Provide greater accuracy to what was originally a poor data source– Hand drawn maps– On-screen digitized
• More equitable assessment for drainage– Geogear draincalc
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Draincalc Overview
• A tool to utilize watershed data
• Allows drainage officials to quickly, accurately create the assessment
• Utilizes the geoprocessing functionality of ArcGIS– Meant to allow non-GIS people to benefit from
GIS
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Tiered Watershed Layer
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Watershed/Parcel Overlay
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Watershed/Parcel Intersect - Lower
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Watershed/Parcel Intersect - Upper
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Watershed/Parcel/Soil Intersect
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Range of Watershed Assessment Options
• Flat rate per benefited acre
• Percent of total (benefited acres)
• Setting minimum assessment amount(s)
• Additional assessment options– Soils– Parcel class/landuse– Distance from hydrological features– Any customization you come up with
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Individual Watershed Projects
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Defined Watershed Project
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Proportion of total - values
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Create Assessment Methods
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Apply Assessment Rule Selections
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Reports
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Hearing Notice
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Print Assessment Schedule
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Summary
• How is this useful in the local government office?– Using GIS we were able to work from only
contours and parcels– Generate watersheds– Calculate assessments for those watersheds– Print hearing notices– Mail merge to labels (by watershed)
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Customizable Assessment Methodology
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Customizable Assessment Methodology
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Benefits
• What benefits are gained from using GIS for these tasks?– More accurate watersheds– More equitable assessment– Speed and efficiency
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Thank you!
Presenter: Andrew Harrison, GISP Business Development ManagerThe Schneider Corporation(317) 826-7393 [email protected]