What Is the Cipoletti Trapezoidal Weir Discharge Calculator?
The Cipoletti weir is a contracted trapezoidal weir whose side slopes flare outwards at 1 horizontal to 4 vertical (tan θ = 0.25).
This specific 1:4 geometric slope adds triangular flow area that exactly compensates for discharge reduction caused by end contractions in a standard rectangular weir.
This calculator computes standard Cipoletti discharge Q = 1.8592·L·H^1.5, evaluates channel approach velocity, and applies kinetic head corrections.
How Does the Cipoletti Trapezoidal Weir Discharge Calculator Work?
The calculation evaluates user-provided measurements using recognized domain equations, converts between measurement units, and adjusts for real-world efficiency factors.
Cipoletti Trapezoidal Weir Discharge Calculator Formula & Variables
The core mathematical equation utilized by this calculator is expressed as:
Standard metric discharge formula utilizes Francis rectangular constant while trapezoidal flanks balance end contraction losses.
How to Use the Cipoletti Trapezoidal Weir Discharge Calculator
- Enter your primary measurements in the input fields above.
- Select your preferred units (e.g. metric or imperial) if applicable.
- Review or adjust operational assumptions such as field efficiency.
- Click Calculate to instantly generate the full results breakdown and visual chart.
- Use the Reset button at any time to clear the form and test a new scenario.
Step-by-Step Example Calculation
Agricultural Irrigation Canal Measurement Weir
Input Values:
Understanding Your Result
Your calculated result represents the realistic operational capacity or baseline output under the specified conditions. Comparing theoretical and effective outputs reveals the direct impact of turns, overlap, and practical downtime.
Factors That Affect the Result
Field terrain, operator experience, equipment maintenance, overlap margin, and weather conditions can significantly influence real-world output.
When Should You Use This Calculator?
Use this calculator whenever you need quick, verified estimates for job planning, budgeting, equipment sizing, or project timelines.
Assumptions & Limitations
- The 1:4 side slope compensation eliminates Francis end-contraction subtraction terms, keeping the discharge coefficient constant.
- Head H must not exceed one-third of crest length L (H ≤ L/3) to preserve 1:4 compensation accuracy.
Frequently Asked Questions
Calculation Accuracy & Reference Note
This calculator implements verified, deterministic mathematical equations based on published standards. Results should be treated as professional engineering estimates; always verify critical operations with local equipment manuals and site inspections.