Bio-physical and chemical characterization of the river system in Apayao Province [Philippines]
2009
Gutierrez, A.B. | Manicad, M.C.Z.
This study determined the bio-physical and chemical characteristics of the major river system and described the habitat of fish and shells in Apayao. Field survey and water analysis were conducted in 10 rivers found in Apayao, namely; Acutan, Nabuangan, Barren, Cabicungan, Laco, Karagawan, Nagan, Binuan, Zumigue and Ziwanan Rivers. Analysis of physico-chemical parameters of the river systems revealed that air and water temperatures range from 22 to 30 deg C, average water velocity 0.11-3.44 m/s, stoney to muddy bottom type, clear water, pH range of 7.32 to 7.97, average DO level and BOD of 6.11 and 2.96 mg/L, respectively. Moreover, these bio-physical and chemical parameters measured in the different rivers fall within the standards set by DENR [Department of Environment and Natural Resources, Philippines] for unpolluted rivers. The different rivers are inhabited by diverse fish and shell species. Activities within the rivers include fishing, bathing, swimming, washing, and transport of goods by the residents. The rivers provide an abundant water supply for irrigation as well as for domestic users. There are Dipterocarp species grown in the area, while shrubs and grasses dominate the buffer zone of the rivers. To conserve these freshwater resources, the 'Lapat' system is implemented in Apayao.
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