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Flashy hydrographs have a steep rising limb and a small lag time. This indicates that river discharge increases rapidly over a short period, indicating rainwater reaches the river very quickly. This means the river is more likely to flood.
Oct 3, 2024 · There are 3 ways that water from a drainage basin is transferred: Directly into the channel – not much. Surface flow – most often. Infiltration - through and baseflow. The typical shape of a flood/storm hydrograph can be referred to as either 'flashy' or 'flat'
Generally, the less the lag time the quicker the river rises, the more FLASHY the graph and the more likely a flood. Lag time is therefore a key feature of a river hydrograph, as it shows how much preparation time people have before a flood strikes.
Oct 17, 2024 · Hydrographs can either be 'flashy response' or 'slow flow'. Slow flow hydrographs have a steady rising limb (actually a similar gradient to the falling limb), low peak discharge and a long lag time - this means that the flood risk here is low.
The runoff or storm flow is the water that arrives in the river via surface runoff or rapid throughflow through the rock. The rising limb gives an indication of how fast water is reaching the channel and represents the level of water rising in the channel.
A flashy hydrograph is a hydrograph that shows a rapid increase in river flow in response to a short period of intense precipitation, or a ‘flash’ of rain. Groundwater hydrograph. A groundwater hydrograph is one that shows changes in the level of groundwater over time, which can impact river flow. Storm hydrograph.
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Jan 20, 2021 · Flash floods are floods that happens very quickly in low-lying land, and they're usually caused by very heavy rain, or when water can't be absorbed quickly enough. Why doesn't the...
