Plumbing Storm Drain Size Calculator

Screen actual storm drain demand against independently verified matched head/slope candidate capacities; no universal rainfall, pipe code table or flood protection approval.

Description

Storm-drain capacities depend on matched slope and hydraulic conditions.

Storm-drain capacities depend on matched slope and hydraulic conditions. A caller catalog screens all candidates against design flow.^[1]

The returned values include Caller compatible candidate ids, Signed candidate capacity margins liters second. The How section below explains the calculation, input rules and interpretation.

When to use Plumbing Storm Drain Size Calculator

Use Plumbing Storm Drain Size Calculator when you need to evaluate the supplied records under the calculation and evidence rules below. No rainfall estimate, hydraulic model or flood/code certification is supplied.

Prepare measured flows, pressures, temperatures or inventories with consistent units. For catalog tools, use independently verified capacities at the stated operating conditions and supply the explicit design demand.

How to use Plumbing Storm Drain Size Calculator and understand its results

Prepare measured flows, pressures, temperatures or inventories with consistent units. For catalog tools, use independently verified capacities at the stated operating conditions and supply the explicit design demand.
Enter callerStormDrainIds, callerMatchedStormDrainCapacityLitersSecond, observedDesignStormDrainLitersSecond using the field table and calculation rules, then run the tool.
Read callerCompatibleCandidateIds, signedCandidateCapacityMarginsLitersSecond. The explanation below defines the units, signs, ordering and any flags or placeholder values.
If the tool reports an input issue, correct the values and run it again. Apply the stated assumptions when interpreting a successfully returned result.

Input field	Meaning	Value type; see rules below	Requirement
callerStormDrainIds	Caller storm drain ids	list of string	Required
callerMatchedStormDrainCapacityLitersSecond	Caller matched storm drain capacity liters second	list of number	Required
observedDesignStormDrainLitersSecond	Observed design storm drain liters second	number	Required

Enter aligned nonempty unique nonblank IDs and nonnegative flow capacities, plus nonnegative design flow. Return all inclusively adequate candidates and signed margins.

margin=capacity−designFlow; eligible=margin≥0

Units, indexing, boundary conditions and exceptional cases are defined in the calculation rules above.

Output field	Meaning	Value type
callerCompatibleCandidateIds	Caller compatible candidate ids	list of string
signedCandidateCapacityMarginsLitersSecond	Signed candidate capacity margins liters second	list of number

json

{
  "input": {
    "callerStormDrainIds": [
      "a",
      "b",
      "c"
    ],
    "callerMatchedStormDrainCapacityLitersSecond": [
      5,
      10,
      20
    ],
    "observedDesignStormDrainLitersSecond": 8
  },
  "output": {
    "callerCompatibleCandidateIds": [
      "b",
      "c"
    ],
    "signedCandidateCapacityMarginsLitersSecond": [
      -3,
      2,
      12
    ]
  }
}

Limitations and assumptions

No rainfall estimate, hydraulic model or flood/code certification is supplied.

Numeric inputs, where present, must be finite. Follow the calculation-specific rules for overflow, underflow and exceptional cases. Numeric lists are limited to 10,000 entries; string lists to 128 strings of at most 128 characters each. The rules above may impose smaller limits. Missing required fields, extra fields, wrong value types and violations of the calculation rules are input errors.

Alternative or Complementary methods

Use Plumbing Roof Drain Size Calculator: Roof-drain selection needs capacities rated at matched head and slope. Comparing primary runoff demand leaves each candidate’s margin visible. For a complementary task, use Plumbing Catch Basin Size Calculator: Catch-basin volume combines a retention budget with reserved sediment storage. Usable fraction converts that budget to nominal volume.

References

Plumbing Storm Drain Size Calculator — tool.io

Similar or alternative tools

Plumbing Roof Drain Size Calculator
Roof-drain selection needs capacities rated at matched head and slope. Comparing primary runoff demand leaves each candidate’s margin visible.
Plumbing Catch Basin Size Calculator
Catch-basin volume combines a retention budget with reserved sediment storage. Usable fraction converts that budget to nominal volume.