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===Costs===
* In Vietnam, after trenches were completed farmers were discussing ways to access low-cost loans with long-time repaymentconditions so that they could replicate the technology. Access to finance therefore seems to be important in scaling up this technology.
* Cost of excavation in Vietnam was around 1,000 Euro per hectare.
* Materials: US$2.6/m3 or US$4,100/ha.