MONITORRING OF ORGANIC POLLUTANTS IN STREAMS AND A RESERVOIR
(case study in
Selorejo Dam, Malang ,Jawa Timur, Indonesia)
BAMBANG PARI PURWANTO
Brawijaya
University, Malang, East of Java, Indonesia
Jl. Mayjen Haryono No.167, Telp.
0341-553286, 587710, 587711, Fax. 0341-551430 Malang 65145
Email : goparipung@yahoo.com
ABSTRACT
The Efect of fertilizer in land
agriculture has become decreasing water quality that couse Eutrophication. Analysis Method that used is analysis
model with AVSWAT 2000, at characteristic of study area are : 237.312 km2
catchment area of Selorejo Dam, simulation devide in 62 subwatershed area
cacthment, including : Forest 0.395 %, mix-dry field 0.128 %, Rice Field 0.214
%, dry land 0.154 %, Urban 0.088 %, lake 0.021 %. The result show that the power river
concerning to load polutant is calss III,that value is minimaly for categoried
on good water quality . The result of simulation model 2003-2005 has become
decreasing lake water quality, 18.5 % dan 23.5 %, total N (Mesotrophic)and Total
P (Eutrophic). Meanwhile, the alteration of landuse in 2010 latters couses
increasing load pollutant in lake of Selorejo DAM. The deviation of Model
AVSWAT 2000, concerning to discarge model and measurement, R2 value is 0.9303, significance level ≤10, concerning to
load polutant, R2 value is 0.907, significance level ≤10. The result of models
are nonhomogeneous form time by time but homogeneous form space model and
measurement.
Keywords :
power river, Mesotrophic, Eutrophic
