Post from Indonesia


Still many questions for TU Delft Master’s student

As part of my Master's degree programme at Delft University of Technology, I have been evaluating the possibilities of using rainwater in Indonesia (Serang) on behalf of World Waternet.

As I gradually approach the end of my internship, the answers to my research questions are becoming increasingly clear. Some of the answers are surprisingly simple. In order to gain maximum benefit from the water stored in the tank during the rainy season, you need to ensure that the tank does not overflow, because otherwise you waste valuable water. But, equally, it is a shame that the rainwater cannot just be used for drinking and cooking during the rainy season but it makes more sense to use the collected water during the drought, when there is no other choice but expensive bottled water for drinking. The groundwater is brackish, and not suitable for drinking even after boiling. The surface water is also highly polluted.

Then there is the issue of the fish that people put in the rainwater storage system to counteract mosquitoes. Initially, I thought that this plan was ridiculous. Having fish in the tank means that there are more nutrients, which enable certain micro-organisms to thrive. Fish can also transmit disease. But the diseases that fish transfer to humans fade into insignificance compared to the advantages. It really appears to help to combat mosquitoes and therefore also diseases such as malaria and dengue fever. Some fish do not even need feeding as they seem capable of surviving on mosquito larvae. In addition, creating a mosquito-proof tank appears to be more difficult than you might think, so the fish are not such a mad idea, after all…

My research also raises lots of new questions that currently remain unanswered. I will keep you posted!

Other posts from Indonesia