Pollution loading from point and non-point sources in San Cristobal Watershed, Laguna de Bay Basin, Philippines
2009
Samiano, R.G.
The Laguna de Bay Basin is facing environmental pressures due to the ever increasing population, land-use conversion, and unabated pollution deliberately discharged in the river systems. The pollution loading from point and non-point sources of San Cristobal watershed was determined using Tank Model (Tajima, 2004), BODsub5, total nitrogen, total phosphorus, total suspended solids, and total coliform were the water quality parameters used. The model calculated the run-off load and the effluent load. Ground truthing was done to validate the location of pollution sources. Secondary data were obtained from LLDA [Laguna Lake Development Authority] on human population, types of industry, livestock population, and non-point sources. The generated pollution load from various sources were integrated into watershed pollution load. The generated load were: 10,005 ton/BODsub5, 1,521 ton NH4-N/year, 496.45 ton total TP/year, 93,818 ton TSS/year and 1.12 E + 13 mpn/year for Tcoli. The effluent load were: 7,203 ton BODsub5/year, 1,213.1 ton NH4-N/year, 445 ton TP/day, 71,635.6 ton TSS/day, and 2.83 E + 12 mpn/day for Tcoli. The domestic load was the highest generator of the five water quality parameters.
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