The Rimba Raya Biodiversity Reserve REDD Project

At KUCC, canal depths of 1.4 to 3.4 meters are necessary tosufficiently lower the water table for planting and maintainingyoung oil palm. To the south, in Rimba Raya, it is expected thatdrainage requirements could exceed those of KUCC given thatthere is no high ground and all deep peats, measured at >4meters throughout the project zone as documented in thecarbon assessment survey.Given the deep peat and the correspondingly deep drainagecanals, it can reasonably be extrapolated that peat subsidencewould exceed 1.5 meters (in the without-­‐project scenario) basedon the calculations for subsidence within the methodology.However, the methodology, as it is currently written, places amaximum cap of 1 meter subsidence, regardless of on-­‐the-­groundconditions at the project site. The survey, nonetheless,serves to provide empirical evidence that the baselinecalculations are conservative by a margin of perhaps 50% andthat the full 1 meter subsidence allowance in the methodologyshould be used in the case of the Rimba Raya carbon accountingarea.Given the deep peat and the correspondingly deep drainagecanals, it can reasonably be extrapolated that peat subsidencewould exceed 1.5 meters (in the without project scenario) basedon the general calculations for subsidence within themethodology and based on other scientific data readily available.margin of perhaps 50% and that the full 1 meter subsidenceallowance in the methodology should be used in the case of theRimba Raya carbon accounting area.Measuring primary drainage canal depthHowever, the methodology, as it is currently written, places amaximum cap of 1 meter subsidence, regardless of actualconditions in the project site.The survey, nonetheless, serves to validate with solid impericalevidence that the baseline calculations are conservative by a91