If a basin has very dense vegetation cover, the vegetation will intercept precipitation and store it, reducing the volume of water entering a river.
Drainage basins with steep sides tend to have shorter lag times than shallower basins. The Recurrence Interval The recurrence interval is a way of measuring the frequency of a flood of a specific size occurring. There was the potential for insurance prices to rise as a result of the flood but this was unlikely because of the rarity of a flood of this scale.
The night after the disaster, people used the Camelford leisure centre as a refuge. Peak discharge — the point on a flood hydrograph when river discharge is at its greatest. Human Factors Affecting Storm Hydrographs There are a range of human factors that affect the shape of a storm hydrograph.
The fall in discharge back to base level is shown in the receding limb. Unconsolidated soils allow water to infiltrate and so act as a store in a drainage basin. Roughly Circular shapes are common as are more elongated and narrow shapes.
The stronger affinity of the salty water to the sediments decreased future agricultural land and water resources and also increasing coastal erosion of the delta.
Basins with lots of streams and rivers a high drainage density will have a short lag time and a fairly steep falling limb because water will drain out of them quickly. An additional economical benefit was the electricity generation by the released water from the dam. Not immediately obvious is the type of storm or precipitation that takes place.
Hydrographs are graphs which show river discharge over a given period of time and show the response of a drainage basin and its river to a period of rainfall. This leads to a short lag time and an increase in peak discharge. GCSE Bitesize Revision - Flood hydrographs Here is a fantastic powerpoint to remind you of how hydrographs are constructed and the factors that affect them - great for revision!
These can be used to show annual discharge patters of flow in relation to climate. The River Valency flows directly through the town and meets the River Jordan at a confluence in the town.
When the snow does melt, large volumes of meltwater will enter the river increasing its discharge and triggering floods. Urbanisation often involves deforestation. The easiest alternative was to expand the irrigated areas and to increase the number of crops per year.
This is because water flows more quickly on the steep slopes down to the river. Characteristics of the Drainage Basin: Storm Hydrographs Hydrographs can be used to illustrate discharge.
A few days after the flood, geologists flew over the area to assess the risk of landslides triggered by the heavy rain. The increase in discharge can be triggered by several events.
Heavy storms result in more water entering the drainage basin which results in a higher discharge. Peak discharge — the point on a flood hydrograph when river discharge is at its greatest.
Smaller basins generally have shorter lag times because precipitation does not have as far to travel. Type and amount of Precipitation: Changes in the climate mean that certain areas are going to experience more frequent and more intense storms that can lead to large floods.
A storm hydrograph is a specific type of hydrograph that, surprise, surprise, shows precipitation and discharge during and after a storm.Discharge & Hydrographs. By Alex Jackson. Last The discharge of a river (or stream) is the volume of water that flows past a point in the river’s course per second.
The volume is indicating that the discharge is increasing. The falling limb is the opposite showing that the discharge is falling. Factors Affecting a Storm Hydrograph. Flooding occurs when a river’s discharge exceeds its channel’s volume causing the river to overflow onto the area surrounding the channel known as the floodplain.
The increase in discharge can be triggered by several events. Factors Affecting Flood Frequency Physical Factors.
Human Factors. If a river’s drainage basin or. Factors affecting a river's discharge. Rock and soil type · Permeable rocks ad soils (such as sandy soils) absorb water easily, so surface run-off is rare · Impermeable rock and soils (such as clay soils) are more closely packed.
Rainwater can’t infiltrate, so water reaches the river more quickly. River Discharge. River discharge is the volume of water flowing through a river channel. This is the total volume of water flowing through a channel at any given point and is measured in cubic metres per second (cumecs).
Human factors affecting storm hydrographs. Peak discharge – the point on a flood hydrograph when river discharge is.
Human and physical factors affecting the River Nile's discharge Essay. The livelihood and stability of Egypt’s population is directly linked to the Nile valley and delta - Human and physical factors affecting the River Nile's discharge Essay introduction.
These two regions account for less than 5% of Egypt’s land surface but the agriculture and water sources are largely concentrated in.
Factors affecting river discharge Factors affecting river discharge The storm hydrograph shows variations in a river's discharge over a short period of time, usually during and immediately following a rainstorm.Download