1. What is Specific Capacity of Open Well?

Specific Capacity of an open well is a measure of the well's productivity, representing the discharge per unit drawdown. It indicates how efficiently a well can yield water and is an important parameter in groundwater hydrology.

2. How Does the Calculator Work?

The calculator uses the Specific Capacity equation:

Where:

• \( KA \) — Specific Capacity (m/s)
• \( t \) — Time (seconds)
• \( h1 \) — Depression Head 1 (meters)
• \( h2 \) — Depression Head 2 (meters)

Explanation: The equation calculates the specific capacity using logarithmic relationship between depression heads over a specific time period.

3. Importance of Specific Capacity Calculation

Details: Specific capacity is crucial for assessing well performance, designing well systems, and managing groundwater resources. It helps determine the sustainable yield of a well and its efficiency in water extraction.

4. Using the Calculator

Tips: Enter time in seconds, depression heads in meters. All values must be valid (time > 0, depression heads > 0). Ensure proper units are used for accurate results.

5. Frequently Asked Questions (FAQ)

Q1: What is the significance of the logarithmic function in the formula?
A: The logarithmic function accounts for the exponential relationship between drawdown and time in groundwater flow equations.

Q2: What are typical values for specific capacity?
A: Specific capacity values vary widely depending on aquifer characteristics, ranging from 0.001 to 10 m²/day or more in highly productive aquifers.

Q3: When should specific capacity tests be conducted?
A: Specific capacity tests should be conducted during well development, after well completion, and periodically during the well's operational life to monitor performance.

Q4: Are there limitations to this calculation method?
A: This method assumes ideal conditions and may not account for all aquifer complexities, well losses, or boundary effects in real-world scenarios.

Q5: How does specific capacity relate to transmissivity?
A: Specific capacity is related to transmissivity but also includes well efficiency factors. It provides a practical measure of well performance rather than just aquifer properties.