Let’s discuss the question: how to calculate lag time on a hydrograph. We summarize all relevant answers in section Q&A of website Linksofstrathaven.com in category: Blog Finance. See more related questions in the comments below.
How do you calculate lag time?
Time = Distance / Speed
Vehicle A would take 10 hours to travel 500 miles, but Vehicle B would take 20 hours. The lag time here is 10 hours. So, the pattern you should note here is “the greater the distance, the longer the lag time.”
What is the lag time on a hydrograph?
Lag time – the time taken between peak rainfall and peak discharge. Rising limb – shows the increase in discharge on a hydrograph.
What is lag time in Hydrology?
Images related to the topicWhat is lag time in Hydrology?
How do you calculate lag time in geology?
For a given annular volume, the lag time (in minutes) can be calculated by dividing the annular volume (bbls) by the flow rate (bbl/min). When using a time value, it should be remembered that if the flow rate changes, so will the lag.
What is a short lag time?
The lag time is the time difference between the peak precipitation and and the peak discharge. A long lag time indicates that it’s taking a long time for precipitation to enter the river. Conversely, a short lag time indicates that the precipitation is entering the river fairly quickly.
What is discharge measured in?
Discharge = V x D x W
If length is measured in feet and time in seconds, Discharge has units of feet3/sec or cubic feet per second (cfs). Depth times Width gives the cross-sectional area. The shape of the channel is important because of the reduction in velocity due to friction along the channel margins.
How do you calculate lag time on a seismogram?
4. To find lag time for earthquake waves at 100 km, subtract the time it takes P waves to travel 100 km from the time it takes S waves to travel 100 km. Record the lag time.
Why do we need to calculate the lag time?
Lag time is traveling time interval required for pumping cuttings from each particular depth to surface. It can be expressed in terms of time (minutes) and pump strokes. The lag time always changes when a well becomes deeper and/or pumping speed change.
What is the SP lag time?
S-P lag time. time between the arrival of the S and P waves (tells us how far away the earthquake occured)
How is discharge calculated?
Measuring Discharge
Discharge is the volume of water moving down a waterway per unit of time. It is most commonly expressed in cubic feet per seconds or gallons per day. To calculate discharge, multiply the area of water in a channel cross section by the average velocity of water in that cross section.
Calculating Lag Time
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What factors affect the lag time?
Slope – steep slopes lead to rapid water transfer and shorter lag times. Gentle slopes slow down water transfer making the lag time longer. Drainage basin shape – a high density basin has more streams and rivers which speed up water transfer and shorten lag time.
What causes lag time vary?
Drainage basins with steep sides tend to have shorter lag times than shallower basins. This is because water flows more quickly on the steep slopes down to the river. 3. Basins that have many streams (high drainage density) drain more quickly so have a shorter lag time.
Why is there a lag time between peak rainfall and peak discharge?
As you can see in the graph below, the peak rainfall is the time of highest rainfall. The peak discharge is the time when the river reaches its highest flow. There is a delay because it takes time for the water to find its way to the river. This is called lag time.
How do you calculate discharge velocity?
Discharge, or the volume of water flowing in a stream over a set interval of time, can be determined with the equation: Q = AV, where Q is discharge (volume/unit time-e.g. m3/second, also called cumecs), A is the cross-sectional area of the stream (e.g. m2), and V is the average velocity (e.g. m/s).
How do you calculate velocity and discharge by current meter?
First, we have to determine the Area by multiplying Depth of each subsection with the Width of each subsection, and then calculate Discharge by multiplying Area with Velocity of each subsection, and sum the results for every subsection in order to get a total Discharge in m3/s. Vi is velocity.
How is monthly discharge calculated?
The sum of daily flows for each month, when divided by the number of days in the month, will give the mean flow for that month. Then, sum each year’s monthly data for a particular month and divide by the number of years to obtain the mean monthly flow for that month for the period of record.
How do we calculate the lag time given the P wave and S wave arrival time?
Determine the lag time for each recording station and enter it into the “lag time” column, by subtracting the P-wave arrival time from the S-wave arrival time.
The Flood/Storm Hydrograph River Discharge GCSE A Level Geography Revision
Images related to the topicThe Flood/Storm Hydrograph River Discharge GCSE A Level Geography Revision
What is the lag time between the P and S wave?
S waves are indicated by an abrupt change in wave amplitude. In the seismogram below, we see that the S wave arrived at about 34 sec after the P wave arrived. This time difference is called the S-P interval and is the lag time between the P and S wave.
How do you calculate time between P and S waves?
7) If you are asked to determine the arrival time of the P-wave and given a clock time for the arrival of the S-wave: Find difference in arrival time between P-wave and S-wave at the given epicenter distance, Subtract the difference in arrival time from the clock time of the S-wave.
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