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The lag time between rainfall and runoff is typically greatest for urban areas due to increased impervious surfaces like roads and buildings that inhibit water absorption. In contrast, natural landscapes such as forests and wetlands generally have shorter lag times as they facilitate greater infiltration and storage of rainfall. Additionally, the type of soil and its saturation level can also influence lag time, with dry, porous soils allowing for quicker absorption and longer lag times.
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why the peak discharge occurs after the peak rainfall?
Peak discharge occurs after peak rainfall due to the time it takes for rainwater to travel over land and through drainage systems to reach rivers and streams. When rain falls, it takes time for the water to runoff and accumulate, which can vary based on factors like soil saturation, land surface conditions, and drainage efficiency. Additionally, some water infiltrates the ground and contributes to groundwater flow, which also takes time to emerge in surface water bodies. Thus, the peak discharge is a delayed response to the peak rainfall event.
What is a rainfall map called?
A rainfall map is commonly referred to as a precipitation map, showing the distribution of precipitation (rainfall, snowfall, etc.) over a specific time period in a given region.
What are lines of equal rainfall called?
Lines of equal rainfall are called isohyets. These lines connect points on a map that have received the same amount of rainfall within a specific time period.
What word means to the greatest degree?
If your the greatest of all time you would be called either an "over lord" or "the greatest of all time".
What is maximum precipitation?
Maximum precipitation refers to the greatest amount of rainfall or snowfall that occurs within a specific location or time period. It is usually measured in terms of inches or millimeters. This information is important for understanding extreme weather events and for assessing potential flooding risks.
What has the author Tsong C Wei written?
Tsong C. Wei has written: 'Effects of areal and time distribution of rainfall on small watershed runoff hydrographs' -- subject(s): Mathematical models, Rain and rainfall, Runoff, Watersheds
How do you use runoff in a sentence?
According to YourDictionary.com..Despite many years of research, accurate real-time modeling of the rainfall runoff process is still difficult to achieve.
What is the difference between flood and drought?
Droughts is the lack of rainfall over a period of time, giving an area a deficit in the normal amount of precipitation. Floods is when there is too much rainfall in single or multipule rain event that the terrain cannot manage the runoff causing the rainfall to back up into areas that normally does not have water like road, homes buildings or bridges.
How do you work out lag time on a hydrograph?
the time between the heaviest rainfall and the peak discharge
How can rainfall data help in the design of drainages?
during the design of drainage, the rainfall data provides the designer rainfall factor. the area of the site or tributary area is given. the volume of water within the tributary area is equal to rainfall depth and the tributary area also it helps to estimate time of concentration and peak runoff rate it is important to design of drainage
Why might heavy rainfall accelerate erosion?
Heavy rainfall can accelerate erosion because the intensity of the rainfall can increase the volume and speed of runoff water, leading to more powerful erosion of soil and sediment. The fast-flowing water can wash away loose particles, break up the soil structure, and create gullies, which can cause significant erosion over time.
What is the average rainfall in the ocean?
The average rainfall varies depending on the climate changes and the time of the year. The average is between 60 and 200 inches of rain.
What are different kinds of runoff?
1. Surface Runoff: It is that portion of rainfall which enters the stream immediately after the rainfall. It occurs. When all losses are satisfied and if rain is still continued, with the rate greater than in filtration rate; at this stage the excess water makes a head over the ground surface (surface detention) which tends to move from one place to another, known as overland flow. As soon as the overland flow joins to the streams, channels or oceans, termed as surface runoff.2. Sub - surface Runoff: That part of rainfall, which first leaches into the soil and moves laterally without joining the water - table to the Streams Rivers or oceans is known as sub - surface runoff. Sometimes sub - surface runoff is also aerated under service ninoff due to reason that it takes very title time to reach the river or channel in comparision to ground water. The sub - surface runoff is usually referred as interflow.3. Base flow: It is delays flow, defined as that part of rainfall which after talling on the ground surface in fill rated into the soil and meets so the water table and flow to the streams oceans etc. The movement of water in this type of runoff is very slow that is why it is also referred as delayed runoff. It takes a long time to join the rivers or oceans. Some times base flow is also known as ground water flow.
What was the greatest amount of rainfall in the shortest time period?
Where: La Re Union France Date: 3.13.07 Amount of rain: 12.9 ft
What has the author D McCallum written?
D. McCallum has written: 'The relationship between maximum rainfall intensity and time' -- subject(s): Mathematical models, Rain and rainfall
What is the greatest time difference between two points on Earth?
The greatest time difference between two points on Earth is 26 hours. This occurs between the Baker and Howland Islands in the Pacific Ocean.
What does the lag time showon a hydrograph?
It shows us the time between the peak rainfall and peak discharge. Peak rainfall is the highest rain amount. Peak discharge is the highest the water level reaches in the river.
