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Rainwater harvesting:
Rainwater is a renewable and sustainable source of water. Use of stored rainwater reduces the environmental impact of the greenhouse by reducing consumption of treated municipal water supplies and pumping of groundwater, which could be subject to scarcity or regulations. It can also help prevent soil erosion by capturing runoff. However, rainwater availability is dependent on weather patterns, making it an intermittent water source. In regions with irregular rainfall, it may not be sufficient to meet greenhouse water needs year-round.
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