Landscape approach to river ecosystem classification and rehabilitation
2006
Dano, A.M., Ecosystems and Research Development Bureau, College, Laguna (Philippines)
Water as a basic commodity for human survival is the greatest concern for river ecosystem management program. For river systems, environmental problems will not be solved in the river alone because causal factors originate, for most part, in the upper watershed areas. Lian-Palico River in Nasugbu, Batangas and Tanay River in Tanay, Rizal [Philippines] both classified as Class C were assessed to determine the true condition of the river systems. Water quality index and aquatic macro-invertebrate indicators were utilized in assessing the state of the two rivers. Assessment serves as basis in determining the problems in various parts of the river and in the formulation of rehabilitation measures. The two river systems were found to have very high level of coliform and organic pollutants way above the limit for Class C water. The low level dissolved oxygen in the lower reach of Lian-Palico River classified as a Very Bad river based on Water Quality Index method may trigger fish kill anytime. Modifying the current system of river classification reflect the present condition, constraints or problems is essential so appropriate measures to address the problems in specific portions of the rivers can be achieved. In the case of the two river systems, measures should focus on addressing the sources of high coliform from the upper to the lower reaches of the river and organic pollutants in some parts of the river. Solid and liquid waste management program in the lower reach of the Palico River should be given priority so the fish kill can be prevented if not minimized.
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