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Bandsar, An Iranian Traditional Rainwater Harvesting for Dryland Agriculture
- J. Tabatabaee Yazdi, PhD,
43,4 98,9 43,4 2,2
Rain (mm)
Aut. Win. Spr. Sum.
Bandsar, An Iranian Traditional Rainwater Harvesting for Dryland - - PowerPoint PPT Presentation
Bandsar, An Iranian Traditional Rainwater Harvesting for Dryland - - PowerPoint PPT Presentation
Small Water and Wastewater Systems ATHENS, GREECE 14 16 Sep., 2016 Bandsar, An Iranian Traditional Rainwater Harvesting for Dryland Agriculture J. Tabatabaee Yazdi, PhD, Agricultural Research, Education and Extension Organization, I.R. Iran
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What is Bandsar?
Rock catchment Seasonal stream Bandsar
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Bandsar components and How it works:
1: main stream, 2: Bandsar inlet, 3: Conveying channel, 4: Levee, 5,7: subsidiary weir and wall, 6: End side weir
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1‐ Harvesting water from
- ne side
2‐ Harvesting water from two sides
Types of Bandsar:
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Types (cont.):
3‐ Harvesting water directly from upstream catchment
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Construction:
Earthmoving by hand tools to shape levees and channels
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Operation:
Bands may be near or faraway from the main stream
Main stream Conveying Channel Main stream Bansar Bansar
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Operation (cont.):
Field is plowed for maximum infiltration to happen Bansar’s levee Farming land
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Operation (cont.):
Shelter to save farmers against cold weather and wildlife
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Operation (Cont.):
Conveying channels are stabilized with local shrub (Vitex pseudo – negundo)
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Operation (Cont.):
evee’s spacing and dimension is selected for most regular water distribution
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Operation (Cont.):
Sediment transported into the Bandsar improves soil texture and fertility
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Utilization:
Cereal and summer crops are main products
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Utilization (cont.):
er products are: Almond, cumin, peas and herbs
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Utilization (cont.):
e weeds grown in bansar during drought period is used for animal feeding
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Destructive Factors:
Expanding irrigated agriculture
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Destructive factores (Cont.):
nd mining along stream bed Road passing through bansar
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Destructive factores (Cont.):
e’s break down due to piping, erasion and overtopping
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Destructive factores:
Changing river morphology
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Maintenance:
Sediment removal and Levees’ heightening
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Some of the experienced Bansar
- wners
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Conclusion
- Easy implementation and maintenance
compared to irrigated lands
- Higher productivity compare to rainfed
agriculture
- Animal manures and crop residue carried into
Bansar increase soil’s porosity and texture.
- Chemical fertilizer is not needed (It is reported
that factors such as phosphate have been increased by 3 to 17 times in bansar)
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Conclution (Cont.)
- No pressure on fragile groundwater resources.
- Applicable in a wide range of the country’s
remote area (It allows those living in a desert environment adjacent to a mountain watershed to create a large oasis in an otherwise stark environment)
- Less water losses by evaporation and
contamination along downstream marshlands and deserts.
- Rural employment (Labor and raw material can
be collected from surrounding places)
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Clip: Floodwater harvesting
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