Understanding Water Bombing: Technology, Mechanism, and Its Role in Firefighting

In efforts to tackle forest and land fires (karhutla) or large-scale blazes such as the one at the Jatiwaringin Final Disposal Site (TPA), the term water bombing often emerges as a primary solution. This technique becomes a mainstay when ground access is difficult to penetrate or when fire spreads at a speed impossible for field personnel to chase. By definition, water bombing is a firefighting technique from the air that involves dropping large quantities of water or chemical retardant using aeroplanes or helicopters. In Indonesia, the National Disaster Management Agency (BNPB) frequently deploys this fleet to address fire crises across various regions. Water bombing operations are not simply about dropping water from a height. There are technical and tactical procedures that must be followed for the effort to be effective and efficient. The air fleet collects water from the nearest source, such as a lake, river, reservoir, or sea. Fixed-wing aircraft typically perform scooping, taking on water while flying low over the water surface, while helicopters use a dipping method by submerging a bambi bucket suspended beneath the helicopter. Before dropping water, the pilot coordinates with the ground team or uses thermal drone technology to identify hotspots. This is crucial to ensure the water falls precisely on the heart of the fire or along its propagation path to create a wet barrier. When above the target, the pilot releases the tank or bucket valve. The altitude and flight speed greatly determine the water dispersal pattern. If too high, the water may evaporate before reaching the ground; if too low, the water pressure could endanger personnel below or damage building structures. A real-world implementation of water bombing was recently seen in handling the fire at the Jatiwaringin TPA in Mauk, Tangerang Regency. The BNPB deployed four water bombing helicopters to tame the flames engulfing the vast piles of waste. The success of this operation was marked by the cessation of air operations after thermal drone monitoring showed no more active hotspots. However, post-water bombing, the crucial stage that must be carried out is soaking and cooling. This aims to keep the temperature in the lower layers of the waste low and damp, preventing the fire from re-emerging due to trapped methane gas. Although highly effective, water bombing has a number of technical and operational challenges. Water bombing is a vital instrument in fire disaster management in Indonesia. However, this technology is not a single solution. The success of firefighting, as seen at the Jatiwaringin TPA, is the result of collaboration between aerial attacks and the hard work of ground teams such as Manggala Agni and the Regional Disaster Management Agency (BPBD) in compartmentalising and cooling the area.