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Corpus Christi Bay Geodatabase for Arc Hydro Framework

This project aims to create a geodatabase for Corpus Christi Bay using the NHDPlus dataset in the Arc Hydro framework. It involves building a geometric network, cutting out the CC Bay watershed, and fitting everything into the Arc Hydro format.

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Corpus Christi Bay Geodatabase for Arc Hydro Framework

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  1. bdsfbdsfb NHDPlus for Corpus Christi Bay Term Project Report Nishesh Mehta 21st November 2006

  2. OBJECTIVE • To create a Geodatabase for the Corpus Christi Bay in the Arc Hydro Framework and using the NHDPlus Dataset

  3. http://www.horizon-systems.com/nhdplus/HSC-wth12.htm NHDPlus dataset for the region given below (which contains the Corpus Christi Bay) Texas Gulf Region 12 d Data Requirements

  4. GIS Methodology1) To build a Geometric Network on the NHDPlus Flowlines for the Texas Gulf • Create a new Geodatabase* and add NHDFlowline shp. file to it • Convert the “Enabled” and “FlowDir” Field type TextInteger • Build the Geometric Network • Set Flow Direction Now the Network is ready for tracing * Network tracing not possible without a Geodatabase

  5. 2) Cutting out CC Bay Watershed • Place Flags at a sub region outlet • Trace upstream • Export the selected feature in a new shape file • Use the “Select by location” option to select all the regions intersecting the newly selected flowlines from all other shape files included in the NHDPlus dataset • Relate various tables in the NHDPlus schema

  6. Courtesy:- NHDPlus User Guide Pg. 5

  7. Fitting Everything into the Arc Hydro Format • Translation of the NHDPlus format to Arc Hydro • Build the Geometric Network • Building “Relationship Classes”* in the Geodatabase mirroring ones in the NHDPlus

  8. CC Bay Geodatabase - Salient Features • Network Tracing and Arc Hydro Tools may be used for analysis • Watershed – helpful in analysis of the CC Bay • NHDPlus Advantage – Enhanced Information • Mean Annual Streamflow and Velocity • Flow Accumulation grids • Land use, precipitation and temperature

  9. CC Bay Database-Salient Features • Example of characteristics that may be estimated using the NHDPlus dataset • Relationships embedded into the Geodatabase for easy access to various tables

  10. Future Work • Geospatial Information – Complete • Environmental Information – Populating the TS tables using Weather Downloader • Integrating various Soil Characteristics for CC Bay • Using Web Services (NEXRAD, NetCDF Server ) to make it a comprehensive database of hydrological information which can be used for modeling

  11. Questions?

  12. Why NHDPlus? • The NHDPlus consists of 6 enhancements: • (1) Value Added Attribute (VAA) - Attributes to analyze the flow network quicker; • (2) Catchments Polygons- the drainage area of each individual NHD flowline with known flow direction based on elevation data; • (3) Geometry-Improvements to produce more accurate flow navigation and improvements to the naming of water features; • (4) Mean Annual Streamflow and Velocity-for each flowline with known flow direction. • (5) Flow Accumulation grids - derived from elevation models; • (6) Land use, precipitation and temperature data associated with each flowline catchment.

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