![]() ![]() If the silt content is high, sediment will be deposited in the reservoir, increasing maintenance costs and decreasing useful life periods. The two most important considerations are the amount of silt carried and the kind and amount of salts dissolved in the water. The quality, as well as the quantity, of surface water is a factor. If adequate streamflow data are not available, the streamflow may be estimated from rain and snow data or from flow data from nearby streams that have similar climatic and physiographic conditions. From streamflow data, determinations can be made of the minimum, maximum, average daily, and average monthly flows the size of dams, spillways, and the downstream channel and the seasonal and carryover storage needed. If the streamflow has been measured regularly over a long period, including times of drought and flood, the studies are greatly simplified. In planning a surface water supply, extensive studies must be made of the flow in the stream or river that will be used. Though both surface and subsurface water come from precipitation such as rain or snow, it is far more difficult to determine the origin of subsurface water. Water supplies may be classified as surface or subsurface. The first consideration in planning an irrigation project is developing a water supply. SpaceNext50 Britannica presents SpaceNext50, From the race to the Moon to space stewardship, we explore a wide range of subjects that feed our curiosity about space!.Learn about the major environmental problems facing our planet and what can be done about them! Saving Earth Britannica Presents Earth’s To-Do List for the 21st Century.Britannica Beyond We’ve created a new place where questions are at the center of learning.100 Women Britannica celebrates the centennial of the Nineteenth Amendment, highlighting suffragists and history-making politicians.COVID-19 Portal While this global health crisis continues to evolve, it can be useful to look to past pandemics to better understand how to respond today.Student Portal Britannica is the ultimate student resource for key school subjects like history, government, literature, and more.Demystified Videos In Demystified, Britannica has all the answers to your burning questions.This Time in History In these videos, find out what happened this month (or any month!) in history.#WTFact Videos In #WTFact Britannica shares some of the most bizarre facts we can find.Britannica Classics Check out these retro videos from Encyclopedia Britannica’s archives.Britannica Explains In these videos, Britannica explains a variety of topics and answers frequently asked questions. ![]()
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