Singaraja, July 29, 2024 - Three students from SMa Negeri 4 Singaraja conducted a research study using dynamic modeling simulations and obtained two important findings on the shrinkage of Buyan Lake in Pancasari Villlage, Sukasada District, Buleleng regency, Bali. This study shows that human activities, especially agriculture, fishing and other activities, have a significant impact on the shrinkage of the lake.

According to the dynamic model used, each individual contributes to the pollution of the lake water with a pollution level of about 2 liters per day, with the degradation of nitrate being 2.5 mg and phosphate 0.3 mg.

"The growth of biomass caused by nitrate and phosphate pollution leads to the sedimentation of Buyan Lake," said Made Maitry, one of the students, as quoted in the scientific book 'Water for Shared Prosperity'.

The modeling results also show that flattening of the lake is not caused by landslides, but by the increased growth of biomass due to pollution. The study predicts that the area of Lake Buyan, which is currently about 3.7 hectares, will shrink to 2.9 hectars by 2050. This means that the lake will shrink by 21% over the next 30 years, or around 7% per year.

"If no remediation measures are taken, the area of the lake could shrink even more drastically. It is estimated that  the area of the lake will only e about 1.1 hectares in 2100," said Gede Rama, another student.

To maintain the sustainability of Lake Buyan, the study recommends reveral important steps. The government is expected to carry out routine remediation measures, including dredging and cleaning, as well as restrictions on land acquisition around the lake for settlements, agriculture and fishing. It must also conduct an in-depth study on tourism activities around the lake.

"The damage to Buyan lake is in direct proportion to the scale of human activities around the lake," he said.

The relevant aothorities will be asked to continuously monitor the condition of the lake and the river. Currently, the data published by the Bulelelng Regency Environmental Service still refers to ols data from 2019. "Monitoring should be carried out regularly every year so that damage to the lake can be detected early." said Gede Rama.

In addition the community also plays an important role in the conservation of Buyan Lake. The community is advised to reduce the use of chemicals containing nitrates and phosphates to control the growth of water hyacinths and weeds. They are also asked to be cautious in developing new agricultural land around the lake and to consider using organic fertilizers as an alternative.

This study also emphasizes the importance of cooperation between the government, relevant authorities and the community in an effort to maintain the sustainability of Buyan Lake so that it can be preserved for future generations.