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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 rains and potential collapse of the structures.
First, it's essential to prepare for the rain to avoid water seeping into the greenhouse. 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. Rain protection in greenhouses typically includes wall protection, roof waterproofing, and drainage systems to prevent backflow.
1. Wall maintenance is crucial. Recently, some vegetable farms in Qingxu have experienced small-scale collapses on the back walls due to heavy rain. The walls have gradually thinned, which affects the insulation during winter. Investigations revealed that rainwater soaking is the main cause of these collapses. When the protective film on the wall is damaged or torn, water can seep through the holes, loosening the soil and eventually leading to collapse. To prevent this, farmers should maintain the structure and cover the walls with film or non-woven fabric. It's important to note that the film is exposed to wind and rain, causing it to age quickly and become easily damaged. If left unchecked, this can lead to wet walls after rain. Therefore, farmers should inspect the condition of the film before heavy rain and make necessary repairs promptly.
2. Roof maintenance is also vital. Many greenhouses have roller blinds positioned low on the rear roof, which can trap rainwater and cause leaks. Farmers should raise the position of these openings. Inside the greenhouse, materials like mulch film and foam can be used to seal the inner corners of the triangular iron, while the outer surface can be covered with additional film to prevent water from entering.
For arch-shaped greenhouses, the focus should be on maintaining both sides of the structure. Cleaning the walkways, digging drainage ditches, and installing rainproof membranes are all important steps. The lower part of the film, about 0.6 to 0.7 meters, can be buried in the soil, while the upper part is secured with steel wire. This helps prevent heavy rain from entering the greenhouse.
Second, it's important to manage drainage during rain to avoid water infiltration. Most modern vegetable greenhouses are built with excavated foundations, and some extend over one meter deep. If drainage is not handled properly during short but intense rainstorms, water can seep in, leading to wet conditions inside the greenhouse. This not only risks structural collapse but also reduces the lifespan of the greenhouse and negatively impacts the growth of crops, resulting in significant financial losses.
1. Digging trenches in front of the greenhouse is recommended. Even with trenches, water may not drain efficiently due to the low terrain. Farmers should deepen the drainage ditches and construct deeper ones with better water collection capabilities. Trenches should be approximately 1 meter wide and 0.5 to 1 meter deep, located about 1.5 meters away from the front of the greenhouse. This allows collected water to be temporarily held and prevents excessive water from flowing into the structure.
2. In the event of heavy rainfall caused by typhoons, it's essential to set up pumping systems for drainage. During the construction phase, farmers should plan for flood control ditches or other drainage channels. In particular, when facing torrential rains exceeding 100 mm in a short period, it's crucial to install pumps promptly to remove water from the drainage system and prevent flooding inside the greenhouse.