understanding upstream downstream interactions of rainwater water harvesting approach n.
Download
Skip this Video
Loading SlideShow in 5 Seconds..
Understanding Upstream-Downstream Interactions of Rainwater Water Harvesting: Approach PowerPoint Presentation
Download Presentation
Understanding Upstream-Downstream Interactions of Rainwater Water Harvesting: Approach

Loading in 2 Seconds...

play fullscreen
1 / 15

Understanding Upstream-Downstream Interactions of Rainwater Water Harvesting: Approach - PowerPoint PPT Presentation


  • 62 Views
  • Uploaded on

Understanding Upstream-Downstream Interactions of Rainwater Water Harvesting: Approach. Bongani Ncube, Manuel Magombeyi, Walter Mupangwa , Paiva Manguambe, David Love. PRESENTATION. Introduction Rainwater harvesting studies under PN17

loader
I am the owner, or an agent authorized to act on behalf of the owner, of the copyrighted work described.
capcha
Download Presentation

PowerPoint Slideshow about 'Understanding Upstream-Downstream Interactions of Rainwater Water Harvesting: Approach' - lev-perry


An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript
understanding upstream downstream interactions of rainwater water harvesting approach

Understanding Upstream-Downstream Interactions of Rainwater Water Harvesting: Approach

Bongani Ncube, Manuel Magombeyi, Walter Mupangwa , Paiva Manguambe, David Love

presentation
PRESENTATION
  • Introduction
  • Rainwater harvesting studies under PN17
  • Proposed approach of assessing up-stream/down stream interactions
introduction
INTRODUCTION
  • Water scarcity in the Limpopo basin
  • FFBAR studies on rainwater harvesting (RWH)
  • Phase 2 – rainwater management
  • Propose approaches of assessing up-stream/down stream interactions
rain water harvesting
Rain Water Harvesting
  • RWH is the process of concentrating rainfall as runoff from a larger/small area for use in smaller target area (Botha et al, 2003).
  • In-field rainwater harvesting
    • Tillage and other in situ soil water management / conservation agriculture strategies
    • Basins (Zambia, Zimbabwe), Zai (Mozambique, Mali and Burkina Faso), Chololo (Tanzania) , Trus system in Sudan, and the Tassa system in Niger – differ in size and spacing
  • Ex-field water management practices and runoff capture
    • Runoff catchments (check dams, rock outcrops), roof catchment, dams, weirs and natural streams
rwh technologies pn17
RWH Technologies: PN17
  • Zimbabwe
    • Mzingwane Catchment (Conservation Farming, basins)
  • Mozambique
    • Chokwe (Zai Pits)
    • Use of plastic material
  • South Africa
    • Olifants Basin - Chololo Pits
    • Supplemental irrigation – water collected from a weir
benefits of basins
Benefits of basins
  • promote infiltration of rainwater
  • minimize soil, water and nutrient losses from the field
  • reduce siltation and pollution (by agrochemicals) downstream of the fields
  • groundwater recharge as soil water is lost through deep drainage especially on sandy soils
  • BUT
    • Water logging occurs in high rainfall seasons
zai pits mozambique
Zai Pits - Mozambique
  • Results
    • Maize and cowpea yields increased under Zai Pits compared to conventional methods
    • 21% of farmers in the study area adopted the pits
    • Which crops do we use under RWH?
    • Need to think of a model to assess the potential payoffs of RWH?
use of plastic material mozambique
Use of plastic material-Mozambique
  • Increase area for in-field rainwater harvesting
  • Possibility of increasing yield by increasing water availability during the growing season
  • System costly, is there a possibility to use local material?
chololo pits south africa2
Chololo Pits – South Africa
  • Higher yield obtained under Chololo pits compared to ridges
  • Ridges performed better than the conventional practice
concluding remarks
Concluding Remarks
  • RWH techniques have been tried at field scale
  • Out-scaling and up-scaling approaches of successful RWH technologies is in the future
  • Socio-economic analysis of the RWH technologies needed