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13.01.2021
Stream Flow | Monitoring & Assessment | US EPA

Toggle navigation Unitarium. Speed Calculator Online Speed Calculator is online 3 in 1 tool. You can easily calculate average speed having time and distance given in different speed of stream calculator pdf of lenght e. See, how fast end easy you can calculate speed having distance and time, how to find distance having time and speed and how to find time having speed and distance. Speed of stream calculator pdf 2 3 4 5 6 number of significant decimal digits.

First, choose what to compute: speed, distance or time Type known values and set units of measurement Calculator will compute the answer automatically as you type. Time Format. Examples: Calculation Examples. Average Speed Calculation - suppose we want to calculate Usain Bolt average speed during his world record winning m sprint race in Berlin August 16, this is default calculation displayed when you enter the page.

What do we know? Speed of stream calculator pdf want speed of stream calculator pdf calculate Bolt's average speed The distance was, of course, meters Bolt ran the distance in 9. So, we have to 1 check the radio button 'Compute Speed', 2 input as a value of distance and set units of the distance to meters. Calculator answers in input box labeled 'speed'. Note, that you can choose desired unit of speed and, for example, if you set units to yards per second, you get the answer: Bolt ran Setting meters per second, you get Travel Time Calculation - Suppose, you drove 21 miles with average speed 45 miles per hour.

How long did you drive? To solve this problem, simply: Check radio button 'Calculate Time'. Type 21 into input box labeled 'Distance' and set distance unit to miles Type 45 into input box labeled 'Speed' and set speed units to miles per hour The calculator displays the answer in input box labeled 'Time' as which means you traveled 28 minutes.

Distance Calculation - Let's calculate, how many miles you can travel, driving 2 hours and 30 minutes with the average speed 55 miles per hour? To answer the question, you should: Check the 'Calculate Distance' radio box and set units to miles Type into 'Time' input box Type 55 into 'Speed' box and set units to miles per hour As you can see, the answer is Assume, V - stands for average speed velocityT - stands for traveling time and D - stands for traveled distance.

For example, if the distance is given in meters and the time is given in seconds, calculated average speed is given in meters per second. To convert it to other units of measurement, you can use our speed converter. If the distance is given in yards and speed is given in miles per hour, to get time in hours, you HAVE TO convert yards to miles or speed of stream calculator pdf per hour to yards per hour .

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Stream velocity, which increases as the volume of the water in the stream increases, determines the kinds of organisms that can live in the stream some need fast-flowing areas; others need quiet pools.

It also affects the amount of silt and sediment carried by the stream. Sediment introduced to quiet, slow-flowing streams will settle quickly to the stream bottom. Fast moving streams will keep sediment suspended longer in the water column. Lastly, fast-moving streams generally have higher levels of dissolved oxygen than slow streams because they are better aerated. This section describes one method for estimating flow in a specific area or reach of a stream.

It is adapted from techniques used by several volunteer monitoring programs and uses a float an object such as an orange, ping-pong ball, pine cone, etc. Calculating flow involves solving an equation that examines the relationship among several variables including stream cross-sectional area, stream length, and water velocity. One way to measure flow is to solve the following equation:.

Refer to section 2. In addition to the standard sampling equipment and apparel, when measuring and calculating flow, include the following equipment:. The stream stretch chosen for the measurement of discharge should be straight no bends , at least 6 inches deep, and should not contain an area of slow water such as a pool. Unobstructed riffles or runs are ideal.

The length that you select will be equal to L in solving the flow equation. Twenty feet is a standard length used by many programs.

Measure your length and mark the upper and lower end by running a transect line across the stream perpendicular to the shore using the string and stakes Fig. The string should be taut and near the water surface. The upstream transect is Transect 1 and the downstream one is Transect 2. Cross-sectional area A in the formula is the product of stream width multiplied by average water depth. The speed of boat in still water is x and speed of stream is y then ratio of time taken in going upstream and downstream is,.

It takes him twice as long as to row up as to row down. Find the rate of the stream of the river. A man can row certain distance downstream in 2 hours and returns the same distance upstream in 6 hours. If the speed of stream is 1. Find the distance between two places? A professional swimmer challenged himself to cross a small river and back. If it took him 15 mins more to cover the distance upstream than downstream, then find the width of the river?

Find the average speed of a boat in a round trip between two places 18 km apart. Attempt subject wise questions in our new practise section' Click here. Download Gradeup , the best government exam app for Preparation. Umesh Kumar Jan 22, Boat And Stream Pdf Exam Pundit Key Shruti Kulkarni Jun 19, Saurabh Ghanghoriya Aug 11, Saumya Sen Aug 13, Devendra Singh Aug 13, However, it is not practical for a streamgage to continuously measure discharge.

Fortunately, there is a strong relation between river stage and discharge and, as a result, a continuous record of river discharge can be determined from the continuous record of stage. Determining discharge from stage requires defining the stage-discharge relationship by measuring discharge at a wide range of river stages.

Discharge is the volume of water moving down a stream or river per unit of time, commonly expressed in cubic feet per second or gallons per day. In general, river discharge is computed by multiplying the area of water in a channel cross section by the average velocity of the water in that cross section:.

The USGS uses numerous methods and types of equipment to measure velocity and cross-sectional area, including the following current meter and Acoustic Doppler Current Profiler. The most common method used by the USGS for measuring velocity is with a current meter. However, a variety of advanced equipment can also be used to sense stage and measure streamflow. In the simplest method, a current meter turns with the flow of the river or stream.

The current meter is used to measure water velocity at predetermined points subsections along a marked line, suspended cableway, or bridge across a river or stream.

The depth of the water is also measured at each point. These velocity and depth measurements are used to compute the total volume of water flowing past the line during a specific interval of time.

Usually a river or stream will be measured at 25 to 30 regularly spaced locations across the river or stream. One method that has been used for decades by the USGS for measuring discharge is the mechanical current-meter method. In this method, the stream channel cross section is divided into numerous vertical subsections.

In each subsection, the area is obtained by measuring the width and depth of the subsection, and the water velocity is determined using a current meter. The discharge in each subsection is computed by multiplying the subsection area by the measured velocity.

The total discharge is then computed by summing the discharge of each subsection. Numerous types of equipment and methods are used by USGS personnel to make current-meter measurements because of the wide range of stream conditions throughout the United States. Subsection width is generally measured using a cable, steel tape, or similar piece of equipment. Subsection depth is measured using a wading rod, if conditions permit, or by suspending a sounding weight from a calibrated cable and reel system off a bridge, cableway, or boat or through a hole drilled in ice.

Developed in the early s and modified many times prior to Purchased from the W. Gurley Company, Troy, New York.

The velocity of the streamflow can be measured using a current meter. The Price AA current meter has a wheel of six metal cups that revolve around a vertical axis. An electronic signal is transmitted by the meter on each revolution allowing the revolutions to be counted and timed. Because the rate at which the cups revolve is directly related to the velocity of the water, the timed revolutions are used to determine the water velocity.

The Price AA meter is designed to be attached to a wading rod for measuring in shallow waters or to be mounted just above a weight suspended from a cable and reel system for measuring in fast or deep water.

In shallow water, the Pygmy Price current meter can be used. It is a two-fifths scale version of the Price AA meter and is designed to be attached to a wading rod. A third mechanical current meter, also a variation of the Price AA current meter, is used for measuring water velocity beneath ice.

Its dimensions allow it to fit easily through a small hole in the ice, and it has a polymer rotor wheel that hinders the adherence of ice and slush. Geological Survey hydrologic technicians use an acoustic Doppler current profiler to measure streamflow on the Boise River in Boise's Veterans Memorial Park as part of a study of phosphorus mass balance. The Doppler Effect is the phenomenon we experience when passed by a car or train that is sounding its horn.

As the car or train passes, the sound of the horn seems to drop in frequency. The ADCP uses the Doppler Effect to determine water velocity by sending a sound pulse into the water and measuring the change in frequency of Boats And Streams Questions And Answers Pdf Kindle that sound pulse reflected back to the ADCP by sediment or other particulates being transported in the water.

The sound is transmitted into the water from a transducer to the bottom of the river and receives return signals throughout the entire depth. To make a discharge measurement, the ADCP is mounted onto a boat or into a small watercraft diagram above with its acoustic beams directed into the water from the water surface.

The ADCP is then guided across the surface of the river to obtain measurements of velocity and depth across the channel. Acoustic velocity meters have also been developed for making wading measurements picture to the left. The ADCP has proven to be beneficial to streamgaging in several ways. The use of ADCPs has reduced the time it takes to make a discharge measurement.





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