Dam Engineering

PMF Hydrograph Peak Discharge Synthesis for Spillway Design Calculator

PMF Hydrograph Peak Discharge Synthesis for Spillway Design engineering calculator.

Quick Answer

Calculate PMF Hydrograph Peak Discharge Synthesis for Spillway Design

Calculator

Hydrograph Discharge (m³⁄s)
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Result Interpretation

PMF Hydrograph Peak Discharge Synthesis for Spillway Design Calculator computes Hydrograph Discharge in m^3/s using the defined engineering formula and the input values provided.

Worked Example

Verified calculation

Given:

  • Probable Maximum Precipitation = 0.52
  • Time to Peak of Unit Hydrograph = 9000
  • Runoff Coefficient = 0.75
  • Watershed Area = 9800000

Expected Result:

  • Hydrograph Discharge = 424.66666666667

Engineering Interpretation:

Under the given input conditions, the calculated result is: Hydrograph Discharge = 424.66666666667 m^3/s.

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

hydrograph discharge = runoff coefficient * probable maximum precipitation * watershed area / time to peak of unit hydrograph

Formula family: formula_dam_spillway_design_flood_pmf_hydrograph_synthesis_engine

Variables

SymbolLabelRoleDescription
C_runoff Runoff Coefficient INPUT Runoff Coefficient
P_max Probable Maximum Precipitation INPUT Probable Maximum Precipitation
A_watershed Watershed Area INPUT Watershed Area
T_peak Time to Peak of Unit Hydrograph INPUT Time to Peak of Unit Hydrograph
result Hydrograph Discharge OUTPUT Hydrograph Discharge

Calculation Steps

  1. Enter the runoff coefficient in dimensionless.
  2. Enter the probable maximum precipitation in m.
  3. Enter the watershed area in m^2.
  4. Enter the time to peak of unit hydrograph in s.
  5. Step 1: Compute hydrograph discharge.
  6. Read the hydrograph discharge (m^3/s) from the results.

Engineering Summary

Calculate PMF Hydrograph Peak Discharge Synthesis for Spillway Design

Frequently Asked Questions

What does this calculator calculate?

The PMF Hydrograph Peak Discharge Synthesis for Spillway Design Calculator estimates Hydrograph Discharge based on the input parameters you provide

Why is runoff coefficient important in this calculation?

runoff coefficient is directly proportional to hydrograph discharge. When you enter runoff coefficient in dimensionless, the calculator uses it in the engineering formula to compute the output

How should I interpret the result hydrograph discharge?

The calculator outputs hydrograph discharge in m^3/s. To convert to liters per second, multiply by 1000. For liters per minute, multiply by 60000. 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: Runoff Coefficient (dimensionless), Probable Maximum Precipitation (m), Watershed Area (m^2), Time to Peak of Unit Hydrograph (s). 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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