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Water-Surface Evaporation in Reservoir

Water-Surface Evaporation in Reservoir. Vitoon Thititanapak December 1999. Acknowledge. Dr. David G. Tarboton. Mark Winkelaar. Objective. To study the effect of evaporation in reservoir. To apply GIS technique in the analysis of the water-surface evaporation. Conceptual Map.

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Water-Surface Evaporation in Reservoir

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  1. Water-Surface Evaporationin Reservoir Vitoon Thititanapak December 1999

  2. Acknowledge Dr. David G. Tarboton Mark Winkelaar

  3. Objective • To study the effect of evaporation in reservoir. • To apply GIS technique in the analysis of the water-surface evaporation.

  4. Conceptual Map • Theory Study • The role of evaporation in reservoir ( water-surface evaporation) • The method for measuring the evaporation • Data collection • DEM from USGS • RF1 from EPA • Dam site from GIS DATA DEPOT and EPA • Pan – evaporation data from • NOAA Technical Report NWS 33 • TOOL • Arc View 3.0 • SINMAP • TARDEM

  5. Theory study 62 % of precipitation fall on the land - 97 % is evapotranspiration - 3 % is open-water evaporation Estimating Free-Water Evaporation - Water-Balance Approach - Mass-Transfer Approach - Energy-Balance Approach - Penman or Combination Approach - Pan-Evaporation Approach ( Class-A pan)

  6. Data collection - DEM grid file from USGS http://edcwww.cr.usgs.gov/doc/edchome/ndcdb/ndcdb.html - rf1 shape file and Dam site shape file from EPA http://www.epa.gov/OST/BASIN/ - Dam location USGS digital raster graphics http://www.gisdatadepot.com/ - Pan evaporation data from NOAA technical report NWS 33

  7. Step 1: Study area The Albers Equal-Area projection Middle Bear Basin Cutler Dam

  8. Step 2: Add DEM grid files

  9. Step 3:Locating Dam as outlet grid Newton Dam

  10. Step 4:Find water-surface area

  11. Step 5:Calculate water-surface evaporation Evaporation = Number of cell count x cell size x pan coefficient x Class-A pan evaporation data * from National Oceanic and Atmospheric Administration Technical report, Office of Hydrology National Weather Service, June 1982 **Map 4: Map of coefficients to convert Class A pan evaporation to free water surface evaporation for May - October

  12. Result Evaporation in Cutler Dam, Utah U.S.A. At elevation +1344.00 m Number of cell count = 13910, Cell size = 30 x 30 m.

  13. Conclusion We can apply GIS technique to find water-surface area in reservoir at the design water level. This technique is limited on GIS data (DEM elevation grid data) to find water-surface area. This method can apply to find the reservoir area in the dam construction project planning.

  14. THE END THANK YOU

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