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Management of Rainwater and Small Reservoir for Multiple Uses
 

Management of Rainwater and Small Reservoir for Multiple Uses

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    Management of Rainwater and Small Reservoir for Multiple Uses Management of Rainwater and Small Reservoir for Multiple Uses Presentation Transcript

    • SCIENCE WORKSHOP : Volta Basin Development Challenge of the CPWF Annual reflection meeting Hydrological Modeling-CPWFV3 03th-05th july , 2012 Presented by Frank ANNOR, KNUST-TUDelft FOWE TAZEN, 2iE Foundation
    • Presentation Outline 1. Background 2. Methodology i. Instrumentation ii. Modeling 3. Initial Results 4. Way forward Andes • Ganges • Limpopo • Mekong • Nile • Volta
    • Background Morphometric characteristics of Boura catchment Surface area (km²) : 155.3 Perimeter (m) : 59.6 Compactness index : 1.34 Mean elevation (m) : 300 Specific elevation(m) : 37.24 Mean slope (m/km) : 3.4% Global slope index(m/km) : 4 Andes • Ganges • Limpopo • Mekong • Nile • Volta Morphometric characteristics of Binaba catchment Surface area (km²): 11.8 Perimeter (m) : 14.6 Compactness index : 1.2 Mean elevation (m) : 225 Specific elevation (m) : 23.80 Mean slope (m/km) : 0.35% Global slope index (m/km) : 6.9
    • Background × No hydrological monitoring – Boura and Binaba watersheds are ungauged • No records of streamflow, evaporation, water level etc • Difficult to calibrate a hydrological model in the basin at a small watershed without these records × Management (allocation) of water has not been streamlined especially for the dry season Objectives  Physical and hydrological     characterization of watersheds of both sites Building of the monthly streamflow time series Establish the water budget of each reservoir Determine the heat balance of the reservoir Model GW-SW interactions Andes • Ganges • Limpopo • Mekong • Nile • Volta
    • TU-Delft 2IE  Developing a Hydrological model (Yates, GIRARD & GR2M)  Developing a water allocation model using WEAP at a smaller watershed level (Boura and Binaba) using the water balance  Water Use  Other components of the water balance i.e Runoff, P,ET, etc  Evaporation and seepage losses in lakes in the Volta basin using water and heat balance  Detailed study in Binaba & (Boura?)  Regionalising for the basin using remote sensing (Images through the TIGER project)  Groundwater surface water interactions (natural Isotopes) Andes • Ganges • Limpopo • Mekong • Nile • Volta
    • Methodology Andes • Ganges • Limpopo • Mekong • Nile • Volta
    • Water budget of the reservoir Boura only ? ? ? Andes • Ganges • Limpopo • Mekong • Nile • Volta
    • Getting the water balance right ..1 gauge plates Rain gauge Evaporation pan Monitoring well DTS EC Andes • Ganges • Limpopo • Mekong • Nile • Volta
    • Getting the water balance right …2 Thalimedes Water Sampling Points for Isotope analyses Rainfall Sampling Andes • Ganges • Limpopo • Mekong • Nile • Volta
    • Modelling Diagnostic Analyses of Users/Typologies (Uses) Model Output from ZonAgri Evaporation & Seepage Losses model output Andes • Ganges • Limpopo • Mekong • Nile • Volta Output from other hydrological models
    • Some initial results Ecoulement moyen mensuel(mm/mois) Lame_GR2M Lame_Yates 16.00 14.00 12.00 10.00 8.00 6.00 4.00 2.00 0.00 Seasonal flows in Boura Andes • Ganges • Limpopo • Mekong • Nile • Volta Lame_Girard
    • Some initial results Annual flows Andes • Ganges • Limpopo • Mekong • Nile • Volta
    • Some initial results Yates Girard 60.00 50.00 40.00 30.00 20.00 10.00 0.00 1971 1973 1975 1977 1979 1981 1983 1985 1987 1989 1991 1993 1995 1997 1999 2001 2003 2005 2007 Ecoulements maxima mensuels par an (mm) GR2M Maximum monthly flows per year Andes • Ganges • Limpopo • Mekong • Nile • Volta
    • Some initial results Modèle GR2M Yates Girard Lame écoulée annuelle moyenne (mm) 36.02 31.6 34.79 Lame écoulée annuelle médiane(mm) 34.21 28.4 35.3 Ecart-type (mm) 16.84 17.6 20.85 Coefficient Variation (%) 46.77 57.74 59.92 Coefficient d'écoulement annuel moyen (%) 3.94 4.66 5.56 Maximum monthly flows per year Andes • Ganges • Limpopo • Mekong • Nile • Volta
    • Some initial results Isotope Analysis Andes • Ganges • Limpopo • Mekong • Nile • Volta
    • Some initial results Water Temperature at bottom of lake 600 25 500 20 400 15 300 10 200 5 100 0 0 Date/Time Binaba reservoir Andes • Ganges • Limpopo • Mekong • Nile • Volta Water level (m) 700 30 Temperature (oC) 35
    • Way Forward More data collection Calibration and verification of models Scenario building (climate change, water uses, cropping pattern) Andes • Ganges • Limpopo • Mekong • Nile • Volta
    • Thank you for your attention Andes • Ganges • Limpopo • Mekong • Nile • Volta