1. What Is Constant Depression Head?

Constant Depression Head in a well represents the steady-state drawdown of the water level when the well is being pumped at a constant rate. It is a key parameter in well hydraulics that helps determine the efficiency and characteristics of the well.

2. How Does The Calculator Work?

The calculator uses the formula:

Where:

• \( H \) — Constant depression head in the well (m)
• \( Q \) — Discharge rate of flow (m³/s)
• \( K \) — Constant depending on the soil at the base of the well

Explanation: This formula calculates the constant depression head by dividing the discharge rate by the soil constant, which represents the relationship between water flow and drawdown in the well.

3. Importance Of Constant Depression Head Calculation

Details: Calculating the constant depression head is essential for well design, determining pumping rates, assessing aquifer characteristics, and ensuring sustainable water extraction without causing excessive drawdown.

4. Using The Calculator

Tips: Enter the discharge rate in cubic meters per second (m³/s) and the soil constant value. Both values must be positive numbers greater than zero for accurate calculation.

5. Frequently Asked Questions (FAQ)

Q1: What factors affect the constant (K) value?
A: The constant K depends on soil permeability, well construction, aquifer characteristics, and the specific geological conditions at the well base.

Q2: How is discharge (Q) typically measured?
A: Discharge is usually measured using flow meters, weirs, or volumetric methods by measuring the volume of water extracted over a specific time period.

Q3: What are typical values for constant depression head?
A: Values vary widely depending on well characteristics and aquifer conditions, typically ranging from a few centimeters to several meters.

Q4: How does this relate to well efficiency?
A: A lower constant depression head for a given discharge rate generally indicates a more efficient well with better hydraulic characteristics.

Q5: Can this formula be used for all well types?
A: This formula is most applicable to wells with constant discharge conditions and may need modification for complex aquifer systems or variable pumping conditions.