megathermal stream

hydrology

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June 30, 2026

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A megathermal stream regime is a classification of river flow, primarily found in hot equatorial and tropical climates. These streams are characterized by sustained discharge throughout the year, often with two peak flow periods, though some may have a single strong peak. This consistent flow is maintained by ample rainfall, which is typical of megathermal climates where precipitation exceeds evaporation and occurs relatively evenly year-round. Unlike intermittent or ephemeral streams that dry up seasonally, megathermal streams are perennial, meaning they flow continuously. The reliable water supply in these regions is a key factor in their hydrological characteristics.123

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Variation of stream regime
In the megathermal class, related to hot equatorial and tropical climates, two main variants occur; discharge is powerfully sustained throughout the year, usually with a double maximum (two peak values), but in some areas with a strong single maximum. In the mesothermal class some regimes resemble those…
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In the megathermal class, related to hot equatorial and tropical climates, two main variants occur; discharge is powerfully sustained throughout the year, usually with a double maximum (two peak values), but in some areas with a strong single maximum. In the mesothermal class some regimes resemble those…
Read More