Water Scarcity

California is a desert like climate. Water levels are rising at a constant rate. Global Warming could be a factor of this drought .

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california drought

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  • The discharge and quality of water from California rivers and reservoirs have broad effects on factors such as water availability, and ecosystem system health. The discharge and quality also fluctuates on timescales ranging from minutes to centuries in complicated ways that seem random at first glance. By taking a large-scale view of these fluctuations and linking them to global scale climatic processes, researchers are beginning to see more structure and predictability than has been previously recognized. For example, the Nation's water resources are tied together on regional scales by their shared responses to temperature and precipitation variations. Understanding these links provides a better scientific basis for predicting and planning for droughts, floods, and water supplies, months to years in advance. The California Water Science Center has installed webcams at several real-time streamgaging sites across the state. Webcams are another resource used to provide real-time surface-water information to scientists, emergency managers, and the general public.
  • Drought Impacts

  • During times of drought, vegetation is visibly dry, stream and river flows decline, water levels in lakes and reservoirs fall, and the depth to water in wells increases. As drought persists, longer-term impacts can emerge, such as land subsidence, seawater intrusion, and damage to ecosystems. Unlike the immediate impacts of drought, however, long-term impacts can be harder to see, but more costly to manage in the future.During drought, declines in surface water flows can be detrimental to water supplies for agriculture and cities, hydropower production, navigation, recreation, and habitat for aquatic and riparian species. Several California Water Science Center streamgages have recently recorded streamflows that are below all-time record lows for specific days of the year. Annual runoff, which is calculated from this streamflow data, supplies many of our needs for water, Recent runoff estimates for California show measurements on par with 1930's and late 1970's droughts. Unlike the effects of a drought on streamflows, groundwater levels in wells may not reflect a shortage of rainfall for a year or more after a drought begins. Despite reduced availability, reliance upon groundwater often increases during drought throughincreased groundwater pumping to meet water demands. If water is pumped at a faster rate than an aquifer is recharged by precipitation or other sources, water levels can drop, resulting in decreased water availability and deterioration of groundwater quality. Ultimately, the surface water and groundwater form one interconnected hydrologic system. Nearly all surface water features - streams, lakes, reservoirs, wetlands, and estuaries - interact with groundwater. In addition to being a major source of water to lakes and wetlands, groundwater plays a crucial role in sustaining streamflow between precipitation events - especially during protracted dry periods. Although the contribution of groundwater to total streamflow varies widely among streams, hydrologists estimate the average contribution is somewhere between 40 and 50 percent.
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