archydro – two components hydrologic data model toolset credit – david r. maidment university...
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ArcHydro – Two Components
Hydrologic Data Model Toolset
Credit – David R. Maidment University of Texas at Austin
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ArcHydro – Data Model
Hydrography
Network
Channel
Drainage
HydroFeatures
Based on inventory of all features for an area
Behavioral model – trace direction of water movement across landscape
Credit – David R. Maidment University of Texas at Austin
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Developed with National Hydrogrophy Dataset (NHD) in mindTools intended to be used with NHD
Integrated raster-vector database
ArcHydro – Data Model
Credit – David R. Maidment University of Texas at Austin
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ArcHydro - Tools
Set of tools used to derive end-productsFlow networkHydrologically conditioned DEM
Iterative, step-by-step approach with required inputs
Raster several formats, vector utilizes geodatabase only
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ArcHydro - Tools Set of tools used to
achieve end-productsFlow networkHydrologically conditioned
DEMCatchment delineation
Iterative, step-by-step approach with required inputs
Raster several formats, vector utilizes geodatabase only
Credit – David R. Maidment University of Texas at Austin
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ArcHydro Pros
Semi-automated derivation of key products
Semi-supportedFreeIntegrates data from
multiple sources and of different types
Cons Semi-automated Install can be difficult User interpretation
and editing introduces subjectivity
Need to know what default settings mean
Few training resources
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Hydrologic Applications
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Hydrologic Modeling
Process-based - try to represent the physical processes observed in the real world
Dozens available – TOPMODEL, SWAT, HSPF, etc.
Variables - Surface runoff, evapotranspiration, etc.
Increasing GIS integration
Predict response of hydrologic systems to changing variables, i.e. precipitation
Credit – Pajaro Valley Water Management Agency
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Hydrologic Modeling - Hydraulics
Model hydraulics of water flow over land and through channels
Assess peak discharge, volume estimates, runoff curve numbers, etc.
HEC-RAS Increasingly GIS-based
or integrated
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Erosion AnalysesLocate sites of likely gully
and other streambank interface erosion
Terrain Analysis approach – Stream Power Index (SPI)
High SPI values indicate high potential overland flow
Quantitative, spatial, repeatable
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Water StorageUtilize LiDAR to accurately
identify size, depth, and location of depressions in the landscape
Reduce Peak Flows Reduce sediment and
nutrients transported downstream
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Water StorageNRCS will have tools
available in the future to better calculate
Rough calculation Perform Pit-fill Subtract original
DEM from pit-filled DEM to locate larger depressions
Multiple methods for determining volume
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Floodplain Mapping/DelineationNational Flood Insurance Program Local communities regulate development
in floodplains Requires accurate floodplain maps
100 Year Flood boundaryKeep building out of 100 year inundation area
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Administered by FEMA Utilizes Flood Insurance Rate Map (FIRM) Update process to digital (DFIRM)
Floodplain Mapping/Delineation
Credit – FEMA
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Mimic flooding at various stages to determine land area and locations inundated
Flood Inundation Area Mapping
Needs• Highly accurate land
elevation data – LiDAR DEM
• Modeling Capabilities- Hydraulic Engineering Center–River Analysis System (HEC–RAS)
• Stream-gauge heights/peak-flow readings
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Flood Inundation Area Mapping
LiDAR DEM
Hydrologic Conditioning
Calibration
Stream gauge Data
Model (HEC-RAS)
Conditioned DEM
Flood Surface Elevations
Inundation Area Map
Credit – USGS
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Flood Inundation Area MappingHydrologic Conditioning - Key
Credit – USGS