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Arc Hydro Data Modeling for Western Kenya

Developing a geospatial model using ASTER DEM to delineate watersheds and build a geo-database for Kenya's regions. Methodology involves Arc Hydro tools and frameworks. Agency data from METI and NASA. Study area spans Nairobi, Rift Valley, Western, and more.

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Arc Hydro Data Modeling for Western Kenya

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  1. CWH-Term Project Ganesh Mallya Goal: Developing Arc Hydro data model for Western Kenya – Delineate the watershed and building a geo-database Data used: ASTER global DEM – 30 m resolution

  2. Study Area- Kenya 1 Central 2 Coast 3 Eastern 4 Nairobi 5 North Eastern 6 Nyanza 7 Rift Valley 8 Western Details Lat: -1.26667 Lon: 36.8 Total area: 224080 sq mi Water: 2.3% Highest elevation: 5199 m (Mt Kenya) Lowest elevation: 0 m (East coast- Indian ocean)

  3. Data Digital Elevation Model (DEM) Source: Terra ( Launched in 1999 and part of NASA’s Earth Observation System) Sensor: ASTER (Advanced Space borne Thermal Emission and Reflectance radiometer) Resolution available: 15 m to 90 m Resolution used: 30m Agencies: METI and NASA Website: https://wist.echo.nasa.gov

  4. Methodology Arc Hydro- Geospatial and temporal data model which operates within Arc GIS - Provides systematic structure to link time series data to geospatial data Arc Hydro tools- Can be used for hydrologic simulations Framework: Geo-database Feature Dataset- to store feature classes, map projection, co-ordinate system etc. Feature Class- Watershed/Drainage basin, Water bodies, Monitoring points Relationship: Features from one class are related to the other End Result: Network- Set of connected points showing pathway of water flow Watershed- Area which drains out into a water body Hydrography-map representation of surface water features in the landscape Time Series- Flow variation with time (based on availability of data)

  5. References and Resources Border Environmental Health Website: http://borderhealth.cr.usgs.gov/ Center for Research in Water Resources (CRWR) at the University of Texas at Austin website: http://www.crwr.utexas.edu/ Maidment, David R., ed. 2002. Arc Hydro GIS for Water Resources. NY: ESRI. http://www.crwr.utexas.edu/gis/archydrobook/ArcHydro.htm National Atlas of the United States: http://www.nationalatlas.gov/ National Hydrography Dataset: http://nhd.usgs.gov/ Wikipedia: http://en.wikipedia.org/wiki/Kenya THANK YOU

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