What are the factors affecting specific capacity of a well?
a) Diameter of well: On increasing the diameter of well, its specific capacity increases as yield of well increases. b) Aquifer thickness: Higher thickness of aquifer, higher will be the specific capacity.
How do you calculate the volume of a well?
Since the volumes within wells are essentially cylinders, the volume calculation is a simple geometric equation where r = well radius and h = the distance from the bottom of the well to the static water level.
What is the rate at which the well is pumped?
The well is continuously pumped at the rate of 60 m 3 /hr. Assuming a well loss coefficient of 0.5 min 2 /m 5, and index n = 2.3, determine the specific capacity and the drawdown in the pumping well after 1 year of drought. What is the well efficiency? This cookie is set by GDPR Cookie Consent plugin.
What is the specific capacity of an aquifer?
The specific capacity curves are thus constructed as shown in Fig. 5.52. For Q = 1200 1pm, t = 1 year, Q/s w = 199 1pm/m. Thus, the specific capacity is a useful concept and indicates the productivity of both aquifer and well in a single parameter. A high specific capacity indicates an efficient (well-constructed and developed) good yielding well.
What is meant by specific capacity of a well?
Definition of specific capacity : the amount of water furnished under a standard unit head : the amount of water that is furnished under unit lowering of the surface of the water in a well by pumping.
How do you calculate the specific capacity of water?
The specific heat capacity of water is 4.18 J/g/°C. We wish to determine the value of Q - the quantity of heat. To do so, we would use the equation Q = m•C•ΔT. The m and the C are known; the ΔT can be determined from the initial and final temperature.
Which test is used to measure the specific capacity of well?
More specifically, a well test will allow prediction of the maximum rate at which water can be pumped from a well, and the distance that the water level in the well will fall for a given pumping rate and duration of pumping.
How do you determine the Specific yield of well?
The Specific yield of WELL = specific capacity OF WELL = option D, Unit is m3/sec/m2/m or in short per second. (1/sec).
What is the easiest way to calculate specific heat capacity?
0:183:56GCSE Science Revision Physics "Specific Heat Capacity" - YouTubeYouTubeStart of suggested clipEnd of suggested clipChanges I'm showing you here some water boiling and the question is how much energy is stored in hotMoreChanges I'm showing you here some water boiling and the question is how much energy is stored in hot water. In order to answer that we need to look at the idea of specific heat capacity. The specific
What is Q MC ∆ T used for?
The amount of heat gained or lost by a sample (q) can be calculated using the equation q = mcΔT, where m is the mass of the sample, c is the specific heat, and ΔT is the temperature change.
What is the unit of specific capacity of a well?
A measurement of well yield per unit depth of drawdown after a specific time has passed, usually 24 hours. Typically expressed as gallons per minute per foot or cubic meters per day per meter (gpm/ft or m3/day/m).
What is the unit of specific capacity?
Specific heat capacity is the energy required to increase temperature of material of a certain mass by 1°C, in the unit of J/(kg·K).
What is the specific capacity of water?
4.186 J/g°CWater has a specific heat capacity of 4.186 J/g°C, meaning that it requires 4.186 J of energy (1 calorie) to heat a gram by one degree. is the change in temperature of the system.
What is specific yield and specific capacity?
Concept: Specific yield is the ratio of volume of water in an aquifer that can be extracted by the force of gravity to the total volume of the saturated aquifer. Specific capacity of a well is its yield per unit drawdown.
What do you understand by specific capacity and specific yield of a well?
The Specific Capacity of a well is the pumping rate (gpm) (Q) divided by the drawdown in feet (s). Specific Capacity can also be used to provide the design pumping rate or maximum yield for the well and to estimate the transmissivity of the surrounding formations penetrated by the well screens.
What is a good yield for a well?
Water wells that reliably yield 5 gpm should be able to meet peak and daily needs for most residences. Wells yielding less than 5 gpm, however, are sometimes the only water source available. These lower yield wells can often meet the total daily water demand, but may not be able to satisfy a household's peak demand.
What is the specific capacity of water?
4.186 J/g°CWater has a specific heat capacity of 4.186 J/g°C, meaning that it requires 4.186 J of energy (1 calorie) to heat a gram by one degree. is the change in temperature of the system.
What is specific capacity in hydrology?
A measurement of well yield per unit depth of drawdown after a specific time has passed, usually 24 hours. Typically expressed as gallons per minute per foot or cubic meters per day per meter (gpm/ft or m3/day/m).
What is the unit of specific capacity?
Specific heat capacity is the energy required to increase temperature of material of a certain mass by 1°C, in the unit of J/(kg·K).
How do you calculate theoretical capacity?
The formula is Q ( Theoretical specific capacity) = zF/M. z=No of electrons transferring, z=Farady constant, M= Molecular mass.
Estimating Maximum Pumping Rate
The maximum pumping rate of a well can be estimated using the initial Specific Capacity. The maximum pumping rate is calculated as the Specific Capacity times the maximum available drawdown. For example, with a well that has 40 feet of drawdown and is pumping 200 gpm has a Specific Capacity of 5.
Estimating Transmissivity
The initial Specific Capacity value can also be used to estimate the transmissivity (T) of the aquifer. Transmissivity is the rate water is transmitted through an aquifer under a unit width and a unit hydraulic gradient. It equals the aquifer’s hydraulic conductivity (K) times the aquifer thickness (b).
Other Factors Affecting Specific Capacity
When turbulent flow occurs in the well, the specific capacity declines as the discharge rate is increased (Sterrett, 2007). It’s important to assess the laminar and turbulent flow components to determine optimal pumping rates and pump depth. This can be accomplished through the use of a step-drawdown test.
Thomas Ballard
Thomas E. Ballard, aka “The Groundwater Guy” is a consulting hydrogeologist with over 35 years experience. He is a registered Professional Geologist in California and Tennessee and Certified Hydrogeologist in California. His work focuses mainly on water resources development for small water districts and groundwater contamination issues.
Numerical Approach
To calculate a well's specific capacity, we only need measured flow rate and water level at the well, making this an easy parameter to evaluate over time in Info360. The equation is simply:
Workflow
Create a new BizBlock assigning a name based the well you are analyzing.
Specific Capacity of an Open Well Solution
Time - Time can be defined as the ongoing and continuous sequence of events that occur in succession, from the past through the present to the future. (Measured in Hour)
What is specific capacity ?
Specific capacity is a quantity that which a water well can produce per unit of drawdown. It is normally obtained from a step drawdown test.
How to Calculate Specific Capacity of an Open Well?
Specific Capacity of an Open Well calculator uses specific_capacity_of_an_open_well = (1/Time)*log( (Depression head/Depression head),e) to calculate the Specific capacity, The Specific Capacity of an Open Well calculates the value of specific capacity of an open well when we have prior information of other parameters used.
Specific Capacity of an Open Well with Base 10 Solution
Time - Time can be defined as the ongoing and continuous sequence of events that occur in succession, from the past through the present to the future. (Measured in Hour)
What is specific capacity ?
Specific capacity is a quantity that which a water well can produce per unit of drawdown. It is normally obtained from a step drawdown test.
How to Calculate Specific Capacity of an Open Well with Base 10?
Specific Capacity of an Open Well with Base 10 calculator uses Specific capacity = (2.303/Time)*log( (Depression head/Depression head),10) to calculate the Specific capacity, The Specific Capacity of an Open Well with Base 10 calculates the value of specific capacity of an open well when we have prior information of other parameters used.
Why do you need to figure the water volume of your well?
Knowing how much water you can collect from your well is an important part of owning one. Knowing how to calculate your well volume will enable you to compare the volume to overall water usage and ensure that you're correctly using your well and not placing undue strain on your water table.
How to calculate the volume of water in a well?
Our well volume calculator is very user-friendly and can help you quickly calculate the volume of water in your well. You just need to measure the well dimensions mentioned below and plug it in our calculator:
Well volume equation
If you would like to calculate it by yourself, you can find the well volume equation below:
Well water treatment
Most well water doesn’t need much filtration if the screen and pump are well maintained.
Fun Fact!
The tap water consumed at homes originates from a variety of sources. Well water is derived from groundwater sources beneath the Earth's surface, which include porous water-bearing rocks and subterranean springs. Furthermore, the method of pumping the water from the well to the surface is a component of where the well water originates.
Well Volume Calculator
Our tool makes it fast and simple to calculate the volume, thus saving time in the field.
Materials Calculator
Our tool makes it fast and simple to calculate the volume and weight, thus saving time in the field.
