The Rimba Raya Biodiversity Reserve REDD Project

G1.8.4. Areas Providing Critical Ecosystem ServicesAreas that provide critical ecosystem services (e.g., hydrologicalservices, erosion control, fire control);This HCV is equivalent to HCV 4 under the Global Toolkit and therevised HCV Toolkit for Indonesia. Under the revised Toolkit,three sub-­‐values are distinguished:HCV 4.1 Areas or ecosystems important for provision ofwater and prevention of floodHCV 4.2 Areas important for the prevention of erosion andsedimentationHCV 4.3 Areas that function as a natural break to thespread of forest or ground fireThe potential presence of each HCV in the Project Zone isdiscussed in turn.HCV 4.1HCV 4.1 draws attention to areas or ecosystems that areimportant for the provision of clean water and prevention offlood for downstream communities and aims to ensuremanagement action is taken to maintain provision of theseservices.Figure 16 Land Class systems in the Project Zone.The revised Toolkit defines areas important for the provision ofclean water as watersheds and riparian zones that feed intorivers on which communities depend for water and relatedservices, such as protein from fishing. Evaluation of HCV 4.1 isthus a two-­‐step process: first, the identification of areas orecosystems known to have a direct impact on river function in71