Table of Contents
How do you calculate peak flow in hydrology?
The Rational Formula is expressed as Q = CiA where: Q =Peak rate of runoff in cubic feet per second C =Runoff coefficient, an empirical coefficient representing a relationship between rainfall and runoff.
How is peak rate calculated?
Peak expiratory flow rate (PEFR) is estimated via one of these equations:
- Children PEFR = ((Height in cm – 100) x 5) + 100.
- Adult Men = (((Height in m x 5.48) + 1.58) – (Age x 0.041)) x 60.
- Adult Women = (((Height in m x 3.72) + 2.24) – (Age x 0.03)) x 60.
What is peak discharge hydrology?
Peak Discharge – The maximum instantaneous rate of water passing a given point, during or after a rainfall event or snowmelt. Rainfall Excess – Water available as runoff after interception, depression storage, and infiltration have taken place.
Which formula is used to determine the peak rate of runoff?
Q=CiA
The Rational method predicts the peak runoff according to the formula: Q=CiA, where C is a runoff coefficient, i is the rainfall intensity, and A is the subcatchment area. This formula is applicable to US or metric evaluation, as long as consistent units are employed.
What does a peak flow measure?
Peak flow is a simple measurement of how quickly you can blow air out of your lungs. It’s often used to help diagnose and monitor asthma. Credit: A peak flow test involves blowing as hard as you can into a small handheld device called a peak flow meter.
How do you calculate the peak power of a motor?
Conservation of energy requires that the effective current on the motor side is then the measured current divided by the duty cycle, as power = current * voltage for DC circuits….Motor Peak Power calculation
- CIM peak power @ 12V = 337W.
- %Vin = 9V/12V = 75%
- CIM peak power @ 9V = 337W * 0.75^2 = 337*0.5625 = 189.5W.
Is flow rate the same as discharge?
Discharge (also called flow rate) The amount of fluid passing a section of a stream in unit time is called the discharge. If v is the mean velocity and A is the cross sectional area, the discharge Q is defined by Q = Av which is known as volume flow rate.
Why is peak discharge important?
Peak discharge plays an important role in triggering channelized debris flows. The rainfall regimes and rainfall characteristics have been demonstrated to have important influences on peak discharge.
How is water runoff calculated?
Simple, straightforward methods of calculating runoff can tell you the amount of water that storms bring to the earth. For a given surface area such as a roof or yard, multiply the area by the inches of rainfall and divide by 231 to obtain the runoff in gallons.
How is a peak flow meter used?
A peak flow meter is a portable, inexpensive, hand-held device that measures your ability to push air out of your lungs. Air flow is measured by the amount of air that you can blow out in one “fast blast.” Peak flow meters come in two ranges to measure the air pushed out of your lungs.
How often should peak flow be measured?
Measure your peak flow at least once a day, usually in the morning before you take your asthma medicines. You might have to check it more often if you are having more episodes than usual, or if your reading is below 80 percent of your personal best.
How do you calculate water runoff?
How do you calculate rain water discharge?
Storm water Discharge calculations: Using Rational formula i.e. Q=CIA Where Q – is design peak runoff rate m3/hr. I – Rainfall Intensity value in mm/hr. A – Catchment area in Ha.
How do you calculate peak RPM?
The results are measured in pound-feet. For example, if you have a 40-horsepower motor designed to operate at a peak of 1,200 rpm, the formula would be T = (5,252 x 40)/1200 = 175.07 lb. -feet.
What is the difference between peak power and RMS?
Think of RMS power as the average power that a speaker can handle on a daily basis without compromising sound quality or experiencing any distortion. The peak power handling is the highest power level that a speaker or a subwoofer can handle in a short burst without blowing.
What is a peak flow in a flood?
The maximum rate of discharge during the period of runoff caused by a storm is called a “peak flow”. The information about peak flows and associated volume of runoff during various floods that have been observed in the past can be complied by the analysis of the observed discharge data and runoff hydrographs.
How can I get information about peak flows and runoff?
The information about peak flows and associated volume of runoff during various floods that have been observed in the past can be complied by the analysis of the observed discharge data and runoff hydrographs.
How does the peak flow calculator work?
This peak flow calculator helps you estimate the predicted maximum speed of expiration according to age, gender and height and check if your measured value is around it. You can discover more on this subject and discover an example calculation below the form.
How does the water cycle produce a high peak flow?
Now local rainfall and runoff from farthest area contributes water to that point simultaneously to give high peak flow.