why do most of the streams in the desert region disappear after sometime
Answers
ANSWER:
Generally, deserts streams disappear in desert owing to high rate of evaporation and also due to the unconsolidated nature of the sediment and sand of the floor.
EXPLANATION:
Desert streams flow during in-frequent however intense rainstorms, and whenever they do, only some parts of the channel comprise water, making the stream flow erratic and irregular and erratic.
One rainstorm can corrode sediment grains in one segment of the channel, whereas another storm transports sediment to a different region. Given this localised sediment movement in the course of rainstorms.
One would think desert conduits to comprise sediment mounds which undulate down the stream path reflecting the erratic and irregular flow, however they do not, instead the water produced in channel flows partially down the stream and then halts since it seeps into river-bed, and there is not sufficient upstream water to supplant it, therefore it disappears.