1. What is Discharge through Drowned Portion?

Discharge through Drowned Portion is a measure of the quantity of fluid flow over unit time, representing the quantity of water in between the downstream and the crest of the water in a submerged weir system.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( Q_2 \) — Discharge through Drowned Portion (m³/s)
• \( Q_T \) — Total Discharge of Submerged Weir (m³/s)
• \( Q_1 \) — Discharge through Free Portion (m³/s)

Explanation: This formula calculates the discharge through the drowned portion by subtracting the free portion discharge from the total discharge over the submerged weir.

3. Importance of Discharge Calculation

Details: Accurate discharge calculation is crucial for hydraulic engineering, water resource management, and designing efficient weir systems for flow measurement and control.

4. Using the Calculator

Tips: Enter total discharge (Q_T) and discharge through free portion (Q₁) in m³/s. Both values must be non-negative numbers.

5. Frequently Asked Questions (FAQ)

Q1: What is a submerged weir?
A: A submerged weir is one where the downstream water level is above the weir crest, affecting the flow characteristics and discharge calculations.

Q2: How does drowning affect weir discharge?
A: When a weir is submerged (drowned), the discharge capacity decreases compared to free flow conditions due to the backwater effect.

Q3: What are typical applications of this calculation?
A: This calculation is used in irrigation systems, flood control structures, hydraulic modeling, and water treatment plant design.

Q4: Are there limitations to this formula?
A: This formula provides a simplified approach and may need adjustments for specific weir shapes, approach conditions, and highly turbulent flows.

Q5: What units should be used for input values?
A: The calculator uses cubic meters per second (m³/s) for all discharge values, which is the standard SI unit for flow rate.