The Rimba Raya Biodiversity Reserve REDD Project

HydrologyWatersheds in the Project Zone were delineated using theHydroSHEDS data set (http://hydrosheds.cr.usgs.gov/). Themajority of the Project Area and Zone fall within the Seruyanwatershed, which flows along the eastern side of the Project Areato the south (Figure 3). The Seruyan watershed itself coversapproximately 13,144 km 2 . Other watersheds in or near theProject Zone are small and near the coastline, with headwatersless than 10 km from the sea.GeologySurface geology of the Project Zone is dominated by depositionalsubstrates of very recent origin compared to much ofKalimantan. These swamp and river deposits are characteristic ofcoastal Kalimantan formations including Rimba Raya.Major elements depicted in Figure 4 are described below. Toproduce this map, scanned copies of Geology sheets number1512 & 1513 (Geological Research and Development Centre1994) were rectified independently to Landsat 5 orthorectifiedimagery (path 119 row 62 02/07/1989) to correct a number ofmajor geographic errors. The two sheets were independentlydigitized and combined, and were found to be inconsistent formany attributes, but are represented as is. Surface geologyclasses TQd and QTp are probably interchangeable in this area,judging from Landsat imagery, but not interchangeable over thefull extent of the sheets (not shown). Class Qs in the northernpart of the Project Zone is probably made up from a combinationof classes Qau and Qas shown separately in the south. Animproved version of the geology can be reconstructed fromLandsat and some limited field work in the future.Figure 3. Watersheds in the Rimba Raya Project Zone and vicinity(i) Deltic Deposits -­‐ Qad. Holocene. Coarse-­‐ to fine-­‐grainedsands, silts, and mud. Loose quartz sands, bright brown, locally8