How is detention pond volume estimated?

Simplified method (FAA/modified rational): V_s = 0.5 × t × (Q_in - Q_out), where V_s is storage volume (m³), t is storm duration at which inflow-outflow difference is maximum (seconds), Q_in is peak inflow (m³/s), and Q_out is allowable outflow (m³/s). A more rigorous approach uses level-pool routing with stage-discharge and stage-storage curves.

What return periods are used for detention pond design?

Typically the pond is designed to attenuate the 10-year post-development peak to the 10-year pre-development peak. The emergency spillway is sized for the 100-year event. The water quality volume (first 25 mm of runoff) is treated separately as a permanent pool or through an extended detention orifice per local stormwater management design manuals.

Detention Pond Volume Calculator

Calculate required detention pond storage volume to attenuate stormwater peak flow to pre-development levels using simplified volume routing.

2D stress state at a point. All stresses in MPa.

σx — Normal Stress X (MPa)

σy — Normal Stress Y (MPa)

τxy — Shear Stress (MPa)

⚙ Mechanical Note: Results are based on standard textbook formulas and ISO/AASHTO references. Always verify critical designs with applicable codes (ISO 898, AASHTO 1993, AISC, Eurocode 3) and a qualified engineer.

How It Works

Calculate required detention pond storage volume to attenuate stormwater peak flow to pre-development levels using simplified volume routing

Each component has a specific meaning:

Simplified volume routing — The simplified volume routing recorded for the patient or scenario being assessed.

Note: Interpret the detention pond volume result against the clinical thresholds and context described above.

How to Use

Enter the simplified volume routing for the patient or scenario you are assessing. Calculate required detention pond storage volume to attenuate stormwater peak flow to pre-development levels using simplified volume routing. Use the detention pond volume result to inform your clinical assessment.

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Frequently Asked Questions

How is detention pond volume estimated?

What return periods are used for detention pond design?