Advanced Geography . A Stream in Dry River Systems and River Basins beds of streams or lakes. Surface water is often muddy, but nearly all ground water is clear, because it moves too slowly to carry waste. Spring water is therefore much better than surface water for drinking. „[ , Most springs flow so slowly that the supply of XSl x ground water from one rain lasts till rain again \ \ r-~, falls. Such springs flow in both rainy and \ • 0- jjj \ fair weather. In long dry spells, or drouths, ik sPrinSs yield less and less water, or they may even cease to flow. The streams then become v
Advanced Geography . A Stream in Dry River Systems and River Basins beds of streams or lakes. Surface water is often muddy, but nearly all ground water is clear, because it moves too slowly to carry waste. Spring water is therefore much better than surface water for drinking. „[ , Most springs flow so slowly that the supply of XSl x ground water from one rain lasts till rain again \ \ r-~, falls. Such springs flow in both rainy and \ • 0- jjj \ fair weather. In long dry spells, or drouths, ik sPrinSs yield less and less water, or they may even cease to flow. The streams then become very low, or perhaps dry up. Topics: — Ground water; springs; best drinking water; drouths. 4. Rivers and River Basins. Some rivers start from springs. Others flow from lakes, swamps or melting ice and snow. The be- nning of a river is called its head or source. Large cities are often built near rivers. If the water flows swiftly, it may be used If the rivers are deep enough, steamers and other vesselsmay go fromplace to place,carrying p
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