Canal projects

Irrigation and Drainage Canal Maintenance

Edwin Muchebve
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Started by Edwin Muchebve on
06 Mar 2014 at 19:14
-, Estuarine & Coastal Engineering Laboratory, Yokohama National University
Know-how: Water & Wastewater, Irrigation Systems, Pumping System Design, Hydrodynamics & Water Quality, Pumps, Fluid Dynamics
Academic

A study on the "Trends and Regional Conditions in Irrigation and Drainage Canal Maintenance in Japan" reveals that:

  1. The declining functionality of farm households and agricultural disadvantages associated with farmland location were more important factors in deciding over the maintenance of the canals by the communities than the increase of non-farmers;
  2. More urbanized communities had less power to assign non-farmers to the maintenance of canals;
  3. Urbanized or depopulated communities were characterized by having difficulty in maintaining the canals whereas the communities in the middle elevated locations succeeded in keeping up their maintenance;
  4. There were regional differences between the influences of the substandard farmland location on the maintenance of the canals by communities. 

http://www.arsa1996.org/pictures/pdf/ARSA_IV_PRCDGS_VOL1/SOCIAL%20CHANGE%20AND%20TRANSFORMATION/11_YASUKO%20HONDA_412-421.pdf

 

 

Comments

Scott T
Dear Edwin, can you share some material about the pump size to be used for particular elevation? Is it possible to pre-calculate the pump size depending just upon the elevation of the field from the canal ? can you help me in this regard?
Edwin Muchebve
Dear Scot. It's possible to estimate the pump size but you need a number of variables: water delivery (discharge) rate, pipe size (then calculate frictional head), static head etc.. Please refer to the FAO Irrigation Manual Module 5 found on the link below.
ftp://ftp.fao.org/docrep/fao/010/ai594e/ai594e00.pdf

Also check this link: http://www.pump-zone.com/december-2013-pump-sizing-efficient-irrigation
Scott T
Edwin, thanks for your the manual
Edwin Muchebve
The common practice in Zimbabwe is pumping water to a night storage reservoir then gravitate it to the fields through canals. In some cases no pumping is necessary. For communal irrigation schemes in Zimbabwe, the idea is to reduce operation cost for rural irrigation farmers. However, most pressurized irrigation systems require pumping.
What is the orientation of the irrigation canals in relation to the fields for the farms you visited in Indonesia? If the fields are at a lower elevation than the canals, pumping is unnecessary unless it's a pressurized system and required pressure cannot be achieved through gravity alone. If fields are at higher elevation than the canals, pumping is necessary.
bob ted
thanks for share Edwin. I had a question, when we visited last time to Indonesia we found out that farmers pull water from irrigation canals by motors. Which is obsoluetly of no need. Have you experienced such thing? And yes, community play a vital role in maintenance.
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