Consider the annual hydrographs for the Mackenzie, Columbia, and Nelson Rivers.. a) describe when the highest…
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Consider the annual hydrographs for the Mackenzie, Columbia, and Nelson Rivers..
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Technifi Expert’s Answer:
a). According to hydrographs for the Mackenzie (1973-1990) , the highest flow of water is in May and the lowest flow is in December and January.
Mackenzie is the second largest river of Canada therefore it has the maximum water flow to Columbia and Neson river.
b). Hydrograph: It is the graphical representation of instantaneous discharge of a stream plotted with time. It includes the integrated contributions from surface runoff, groundwater seepage, drainage and channel precipitation. The shape of a hydrograph of a single storm occurring over the drainage area follows a general pattern.
Neson River: At the beginning of the rainfall, the river discharge is low and a period of time elapses before the river begins to rise. During this period the rainfall is intercepted by vegetation or soaks into the ground to make up the soil moisture deficit. The length of the delay before the river rises depends on the wetness of the catchment before the storm and on the intensity of the rainfall itself.
When the rainfall has made up the catchment deficits and when surfaces and soils are saturated, the rains begin to contribute to the stream flow. The proportion of rainfall that finds its way to the river is known as effective rainfall, the rest being “lost” in evaporation, detention on the surface or retention in the soil. As the storm proceeds, the proportion of effective rainfall increases and that of lost rainfall decreases, resulting in a strongly rising limb in Nelson river.
Climate & landscape factor have the important role in the shape of hydrographs of any river system. If the climate is not humid means poor rainfall occurs and landscape is not flat that means amount of precipitated water is runoff means no change in hydrographs.
c). According to the study of hydrographs of above rivers it is suggested that hydroelectric generation potential may occur in highest rainfall & lowest evaporation & runoff means if you have huge amount of water you have high potential to generate of hydroelectric power.
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