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Engineering Tool · Tanks & Basins

Clearwell & Storage Turnover Designer

Calculate storage turnover and an interval-by-interval clearwell inventory trajectory.

Municipal Drinking WaterStage 06 — Distribution & Final Quality
Status
Available
PROJECT · OPTIONAL

Project metadata

Report context for exports; it does not change calculations.Edit detailsHide details

01 · USER INPUT

Design basis and inputs

Storage intervals

Intervals continue from the previous ending inventory.

Hour 1
Hour 1
Hour 2
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Hour 3
Hour 3
Hour 4
Hour 4
Engineering calculations run locally in this browser after assets load.

02 · CALCULATED RESULT

Results at a glance

Load or enter inputs, then calculate to create an authoritative result.

03 · REPORTING

Exports and verification

CSV contains input and output detail. PDF uses the current calculation and report metadata.

Verification suite

Calculation revision f3f675ac

63 focused fixtures: turnover fixture, interval row normalization, optional bounds, initial inventory feasibility, trajectory limits, structured results, exports, and stale-result behavior. Tests are deterministic and run without network access.
01

Engineering Basis

Methodology

Calculates usable storage, nominal turnover, and interval inventory continuity from declared inflow, outflow, and duration. Nominal turnover is not actual water age, RTD, T10 tracer contact time, or disinfection CT; this tool does not calculate T10.

Usable storage = gross storage × user-entered usable fraction. Operational storage is separately entered as a declared operating-storage basis and remains a subset of usable storage.

Nominal turnover time = usable storage / average throughput; nominal turnovers/day = average throughput / usable storage.

Interval continuity uses Snext = Scurrent + (Qin − Qout) × duration. When physical limits are enabled, overflow is recorded above the maximum and supply shortfall below the minimum; the modeled endpoint is limited to the applicable bound.

Working storage swing = maximum modeled inventory − minimum modeled inventory, including initial inventory and all modeled interval endpoints.

Scope / Limitations

  • Review usable volume, turnovers, trajectory extrema and working swing. Unbounded mode preserves entered overflows or shortfalls and warns; bounded mode tracks them explicitly.
  • Nominal turnover is not actual water age, residence-time distribution, T10 tracer contact time, disinfection contact time (CT), or a mixing-performance measure; this tool does not calculate T10.
  • The interval calculation is a storage continuity screen. It does not simulate hydraulics, mixing, or water quality.
02

Engineering Path

Upstream Context

Current Tool Decision

  • Clearwell & Storage Turnover Designer Calculate storage turnover and an interval-by-interval clearwell inventory trajectory.

Downstream Engineering Step

03

Related Resources

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