Stormwater Engineering

Stormwater Conveyance System Backwater Curve Elevation Calculator

Stormwater Conveyance System Backwater Curve Elevation Calculator engineering calculator.

Quick Answer

Calculate Stormwater Conveyance System Backwater Curve Elevation Calculator

Calculator

Backwater Curve Elevation (m)
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Result Interpretation

Stormwater Conveyance System Backwater Curve Elevation Calculator computes Backwater Curve Elevation in m using the defined engineering formula and the input values provided.

Worked Example

Verified calculation

Given:

  • Conveyance Reach Length = 60
  • Energy Grade Line Friction Slope = 0.0015
  • Upstream Velocity Head = 0.28
  • Downstream Velocity Head = 0.42
  • Upstream Water Surface Elevation = 102.5

Expected Result:

  • Backwater Curve Elevation = 102.27

Engineering Interpretation:

Under the given input conditions, the calculated result is: Backwater Curve Elevation = 102.27 m.

The actual numerical result is computed by the Runtime engine using the persisted tool definition. The values shown here come from automatically validated test cases.

Formula / Method

backwater curve elevation = upstream water surface elevation - (energy grade line friction slope * conveyance reach length) + (upstream velocity head - downstream velocity head)

Formula family: formula_stormwater_stormwater_conveyance_system_backwater_curve_analyzer

Variables

SymbolLabelRoleDescription
upstream_water_surface_elevation Upstream Water Surface Elevation INPUT Upstream Water Surface Elevation
velocity_head_upstream Upstream Velocity Head INPUT Upstream Velocity Head
velocity_head_downstream Downstream Velocity Head INPUT Downstream Velocity Head
friction_slope Energy Grade Line Friction Slope INPUT Energy Grade Line Friction Slope
reach_length Conveyance Reach Length INPUT Conveyance Reach Length
backwater_curve_elevation Backwater Curve Elevation OUTPUT Backwater Curve Elevation

Calculation Steps

  1. Enter the upstream water surface elevation in m.
  2. Enter the upstream velocity head in m.
  3. Enter the downstream velocity head in m.
  4. Enter the energy grade line friction slope in m/m.
  5. Enter the conveyance reach length in m.
  6. Step 1: Compute backwater curve elevation.
  7. Read the backwater curve elevation (m) from the results.

Engineering Summary

Calculate Stormwater Conveyance System Backwater Curve Elevation Calculator

Frequently Asked Questions

What does this calculator calculate?

The Stormwater Conveyance System Backwater Curve Elevation Calculator estimates Backwater Curve Elevation based on the input parameters you provide

Why is upstream water surface elevation important in this calculation?

upstream water surface elevation is directly proportional to backwater curve elevation. When you enter upstream water surface elevation in m, the calculator uses it in the engineering formula to compute the output

How should I interpret the result backwater curve elevation?

The calculator outputs backwater curve elevation in m. The result is computed directly from the input values using the defined engineering formula

What units should I use for the inputs?

Enter each value in the units shown next to the input field: Upstream Water Surface Elevation (m), Upstream Velocity Head (m), Downstream Velocity Head (m), Energy Grade Line Friction Slope (m/m), Conveyance Reach Length (m). Make sure all inputs use the specified units for consistent results

What assumptions does this calculator use?

This calculator uses automatically validated engineering formulas. Results are approximate and should be validated against site-specific conditions, applicable codes, and professional engineering judgment

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