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A search on our IRC web site on arborloo gives two articles that may be of interest to you: Assessment of CRS Experience with Arborloos
And: Ethiopia: the success of the ArborLoo latrine.
In addition, the Performance Improvement through Learning in Sanitation Programme in Uganda carried out action research on the Arbor Loo in 2011.
The following documents may be of use: cost estimate for an arborloo made of local materials and a guide on how to shift arborloos. See https://www.irc.nl/page/70809
The first document provides details about the average cost of building an Arborloo latrine in Northern Uganda, at the end of 2011. This cost estimate, which was also translated in Luo language, can be used by local government and NGO/CBO staff in the Acholi region to inform communities and schools that are interested in having an Arborloo toilet built. It is also a guiding document for local latrine masons.
The second document provides information on how to move a full arborloo and gives suggestions on what to do with the space afterwards.