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

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

Data 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: Digital Elevation Model (DEM)

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)

References and Resources Border Environmental Health Website: Center for Research in Water Resources (CRWR) at the University of Texas at Austin website: Maidment, David R., ed Arc Hydro GIS for Water Resources. NY: ESRI. National Atlas of the United States: National Hydrography Dataset: Wikipedia: THANK YOU