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This summer, the amount of rainfall has been noticeably higher than in previous years. As we enter autumn, the precipitation is expected to increase compared to last year. Farmers are advised to pay close attention to the safety of their greenhouses and ensure timely repairs and proper drainage to prevent damage caused by heavy rain and potential collapse.
First, it's essential to prepare for the rain to avoid water seeping into the greenhouse structure. In recent years, severe weather events such as heavy rain and hail have become more frequent, making the maintenance of greenhouses a top priority for vegetable farmers. The primary aspects of rain protection include wall waterproofing, roof waterproofing, and drainage prevention.
1. Wall maintenance is crucial. Recently, there has been an increase in rainfall, and some greenhouses in Qingxu have experienced partial collapses on the back walls. Over time, the walls have become thinner, which can affect the insulation during winter. Investigations show that rainwater infiltration is the main cause of wall damage. When the protective film on the wall is damaged, water can seep through the holes, loosening the soil and eventually leading to collapse. Vegetable farmers should regularly inspect the shed coverings and repair any damage before heavy rains arrive. It's important to note that the film is exposed to wind and rain, which accelerates aging and makes it more prone to tearing. If left unattended, this can result in wet walls after rain. Therefore, regular checks and timely repairs are essential.
2. Roof maintenance is also vital. Many greenhouses have roller blinds placed at a low position on the rear roof, causing water to collect and potentially leak into the structure. To prevent this, it's recommended to raise the position of these openings. Inside the greenhouse, materials like mulch films or foam can be used to fill gaps along the inner corner of the triangular iron frame. Additionally, the outer surface of the roof should be covered with a film that is properly secured to prevent water from entering.
For arch-shaped greenhouses, special attention should be given to both sides of the structure. Cleaning the walkways, digging drainage ditches, and installing rainproof membranes are essential steps. The lower edge of the film, about 0.6 to 0.7 meters long, can be buried in the soil, while the upper part should be fixed with steel wires. This method effectively prevents heavy rain from entering the greenhouse.
Second, it's important to manage drainage during rainfall to avoid water accumulation inside the greenhouse. Most of the current greenhouses are built using excavation methods, and some have dug as deep as one meter. If drainage is not handled promptly after a short but intense rainstorm, water can accumulate inside the structure, leading to wetting of the walls and potential collapse. This not only reduces the lifespan of the greenhouse but also affects crop cultivation, resulting in significant financial losses.
1. Digging trenches in front of the greenhouse is highly recommended. Even if trenches are already in place, water may still be difficult to drain due to the low terrain. It's advisable for farmers to deepen the drainage ditches and construct deeper channels that can collect water effectively. Trenches should be approximately 1 meter wide and 0.5 to 1 meter deep, located about 1.5 meters in front of the greenhouse. This helps to temporarily collect runoff and prevent excessive water from flowing into the structure.
2. During heavy rainfall caused by typhoons, it's essential to set up pumping systems for drainage. When constructing a greenhouse area, it's important to plan for flood control ditches or other drainage systems. In particular, when encountering torrential rain that exceeds 100 mm within a short period, farmers should install pumps promptly to remove excess water from the drainage system. This ensures that the catchment tank does not overflow, preventing the greenhouse from being submerged.