WFP Hydrologic cycle

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  • This transparency shows the important factors for water harvesting for crop production. One of the factors is hydrology, it will be treated in the following lecture units.
  • This transparency shows the important factors for water harvesting for crop production. One of the factors is hydrology, it will be treated in the following lecture units.
  • This transparency shows the important factors for water harvesting for crop production. One of the factors is hydrology, it will be treated in the following lecture units.
  • This transparency shows the important factors for water harvesting for crop production. One of the factors is hydrology, it will be treated in the following lecture units.
  • This transparency shows the important factors for water harvesting for crop production. One of the factors is hydrology, it will be treated in the following lecture units.
  • This transparency shows the important factors for water harvesting for crop production. One of the factors is hydrology, it will be treated in the following lecture units.
  • This transparency shows the important factors for water harvesting for crop production. One of the factors is hydrology, it will be treated in the following lecture units.
  • Hydrology deals with the waters of the earth, their occurrence, circulation and distribution, their chemical and physical properties, and their reaction with their environment, including their relation to living things (Linsley 1983). It encompasses the full life history of water on the earth. It is essential, particularly for engineers, technical personnel who are engaged in the design, planning or construction of irrigation structures, bridges & highway culverts, flood control works, water harvesting systems, etc.. It helps to answer critical questions during the planning of water resource projects. For example: What flood flows can be expected over a spillway, at a highway culvert, or in an urban storm drainage? What reservoir capacity is required to ensure adequate water supply for irrigation or municipal water supply during droughts? What effect on the river water levels will be produced after the construction of proposed reservoirs, levees, or any controlling structures? Specifically to the Water harvesting scheme, it is employed to: Make rainfall analysis Estimate runoff from catchments Prognose water supply to crops per unit time Determine peak discharge for spillway design
  • Water balance (budget) is a balance sheet of all the water entering and leaving a particular catchment or drainage basin. It is used to compute one missing parameter, mostly for evapo-transpiration. In the water balance equation the sign of U (underground outflow) can be positive or negative according to the direction of flow of water between the stream and the ground water zone. For effluent streams, where there is flow of water from the groundwater zone to the stream, the sign of U will be positive. However, for influent streams, where the flow of water is from the streams to the groundwater zone, U will take a negative sign.
  • WFP Hydrologic cycle

    1. 1. Hydrologic Cycle & Rainwater Partitioning Alex Oduor & Paul Kimeu
    2. 2. Hydrology - Unit 1 WATER HARVESTING FOR CROP PRODUCTION THE MOST IMPORTANT FACTORS FOR A WH SYSTEM
    3. 3. Hydrology - Unit 1 HYDROLOGY WATER HARVESTING FOR CROP PRODUCTION THE MOST IMPORTANT FACTORS FOR A WH SYSTEM
    4. 4. Hydrology - Unit 1 CLIMATE HYDROLOGY WATER HARVESTING FOR CROP PRODUCTION THE MOST IMPORTANT FACTORS FOR A WH SYSTEM
    5. 5. Hydrology - Unit 1 CLIMATE HYDROLOGY TOPOGRAPHY WATER HARVESTING FOR CROP PRODUCTION WHAT ARE THE MOST IMPORTANT FACTORS FOR A WH SYSTEM ?
    6. 6. Hydrology - Unit 1 CLIMATE HYDROLOGY TOPOGRAPHY WATER HARVESTING FOR CROP PRODUCTION AGRONOMY WHAT ARE THE MOST IMPORTANT FACTORS FOR A WH SYSTEM ?
    7. 7. Hydrology - Unit 1 CLIMATE HYDROLOGY TOPOGRAPHY WATER HARVESTING FOR CROP PRODUCTION AGRONOMY SOILS WHAT ARE THE MOST IMPORTANT FACTORS FOR A WH SYSTEM ?
    8. 8. Hydrology - Unit 1 CLIMATE HYDROLOGY TOPOGRAPHY WATER HARVESTING FOR CROP PRODUCTION SOCIO-ECONOMY AGRONOMY SOILS WHAT ARE THE MOST IMPORTANT FACTORS FOR A WH SYSTEM ?
    9. 9. Hydrology - Unit 1 WHAT DOES HYDROLOGY DEAL WITH ? <ul><li>HYDROLOGY deals with </li></ul><ul><ul><li>the waters of the earth, </li></ul></ul><ul><ul><li>their occurrence, circulation and distribution, </li></ul></ul><ul><ul><li>their chemical and physical properties, </li></ul></ul><ul><ul><li>and their reaction with their environment, </li></ul></ul><ul><ul><li>including their relation to living things. </li></ul></ul><ul><li>HYDROLOGY = FULL LIFE HISTORY OF WATER ON </li></ul><ul><li>THE EARTH ! </li></ul>
    10. 10. Hydrology - Unit 1 Water balance at a catchment
    11. 11. Hydrologic Cycle in the context of Green & Blue water fluxes
    12. 12. Renewal period for H 2 O resources Water in the Hydrosphere Period of renewal Oceans 2,500 years Groundwater 1,400 years Lakes 17 years Soil moisture 1 year Channel network 16 days Atmospheric moisture 8 days Biological water Several hours
    13. 13. 1 st & 2 nd Degree Rainwater Partitioning
    14. 14. Greenwater Ecosystem Partitions
    15. 15. THE END

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