2. Material & Methods

2.1 Description of the Surveyed Area

The Upper Citarum River Basin (UCRB) is located between 107°15’36”- 107°57’00” E and 06°’43’48” - 07°’15’00” S (Fig.1 ).  It is the upstream part of the Citarum River Catchment and drains into the Saguling Reservoir, west of the Bandung City. The UCRB covers a total area of approximately 1,822 km2, consisting of 93 districts in 6 regencies and 2 cities (Harlan et al., 2018; Statistics Indonesia, 2015). Agricultural area dominates the area where about 200,000 people work as farmers (Statistics Indonesia, 2015). According to a study by Rochmanti (2009), pesticide usage is high in this area. The main agricultural crops grown are vegetables and rice. Flowers and fruits are also grown but in small-scale fields. Table 1 presents an overview of the most common crop types in UCRB and their corresponding surface areas.