Water sources and their conservations

Water Sources and Conservation Water covers 71% of Earth's surface, but usable freshwater makes up only about 3%, with the remaining 97% consisting of saline ocean water. Freshwater exists in two primary reservoirs: surface water (rivers, lakes, ponds, and streams) and groundwater stored in subterranean permeable rock layers called aquifers. Surface water relies on seasonal rain and glacial melt, while groundwater forms when rainwater filters down through soil and gravel layers via infiltration. Because groundwater and surface bodies are vulnerable to over-extraction and pollution, conservation is vital to ensure long-term availability: Rainwater Harvesting: Captures roof and ground runoff, channeling it through sand-gravel filters into cisterns or deep recharge wells to replenish local aquifers. Modern Irrigation: Replaces water-intensive flood methods with drip irrigation, which delivers moisture directly to plant roots to cut consumption by 50% to 70%, and sprinkler systems that ensure uniform coverage. Traditional Watershed Structures: Restores heritage earthworks—such as check dams, earthen ponds (johads), and stepwells (bawris)—to slow monsoon runoff and lift surrounding water tables. Household Auditing: Saves significant municipal water by fixing leaky faucets, turning off running taps, taking bucket baths, and reusing domestic RO or kitchen greywater.