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VerWater
Water & Wastewater Engineering Calculator
Professional water quality assessment, hydraulic design, aeration sizing & regulatory compliance — verified against NSF, WHO, EPA, EU and Thai PCD standards. Built for environmental engineers, consultants, and plant operators. 100% offline.
Pay once, use forever — No subscription, no ads
Water Quality + Wastewater + Hydraulics
A complete environmental engineering toolkit
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NSF Water Quality Index
9 params
- Brown et al. (1970) curve-based weighted index
- DO saturation, BOD, pH, nitrates, phosphates, turbidity
- Temperature change & total solids parameters
- Automatic Excellent → Very Bad classification
- Compare against global benchmarks
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BOD & COD Analysis
9 modes
- BOD₅, BODₐ & ultimate BOD calculation
- Temperature correction (Streeter-Phelps k-rate)
- Reaction-rate constant determination
- COD removal efficiency & biodegradability ratio
- Industry auto-identification from BOD/COD ratio
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Compliance Check
- Thai PCD effluent standards (Type A / B / C)
- Surface water classification (Class 1–5)
- Pass / fail verdict per parameter
- Multi-parameter batch evaluation
- Recommendations for non-compliance
Thai PCDB.E. 2537
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Pipe Sizing & Headloss
3 formulas
- Hazen-Williams for water distribution
- Darcy-Weisbach with Moody friction factor
- Manning equation for open channels
- Velocity constraint (0.3–2.5 m/s) sizing
- Minor loss for 11 fittings (elbow, tee, valve...)
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Tank, Pump, NPSH & Water Hammer
- Equalization + fire reserve + emergency volume
- Pump power (hydraulic + brake + electrical) and Affinity Laws (VFD)
- NPSH Available with cavitation status (SAFE / MARGINAL / RISK)
- Water Hammer (Joukowsky / Michaud) with pipe material library
- Pipe rating check — flag pressure surge above class
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Manning's Open Channel
4 shapes
- Rectangular, trapezoidal, triangular, circular cross-sections
- Solve for discharge (Q) or normal depth (iterative)
- Auto Froude regime (subcritical / critical / supercritical)
- Roughness library (concrete, brick, gravel, riprap, natural)
- Circular pipe Q-peak handled at y/D ≈ 0.938 (FHWA HDS-3)
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Stormwater
Rational + Tc
- Rational Method peak flow Q = C·i·A
- Composite C editor for mixed land use
- Time of Concentration via Kirpich + NRCS Lag
- Conservative recommendation (longer Tc)
- Runoff coefficient library for typical surfaces
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Aeration Design
SOTR + Blower
- Oxygen demand from BOD load & nitrification
- SOTR / AOTR with alpha, beta & theta factors
- Diffuser selection (fine bubble vs. coarse bubble)
- Air flow & blower power sizing
- Energy cost & specific energy consumption
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Disinfection — CT & Decay
USEPA SWTR
- USEPA SWTR CT for Giardia, Virus, Cryptosporidium guidance
- Trilinear interpolation: temperature × pH × chlorine residual
- First-order Chlorine Decay (bulk + wall) in distribution mains
- Travel time, residual at outlet, time-to-minimum-residual
- Compliance check against minimum residual at outlet
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Sedimentation
Stokes + Tank
- Settling velocity with auto Stokes / Allen / Newton regime
- Sedimentation Tank designer (rectangular & circular)
- Surface Overflow Rate, Detention Time, Weir Loading Rate
- Primary & secondary clarifier compliance bands
- Auto weir-length estimate with explicit override option
Multi-Standard Reference Library
Built-in regulatory data — no internet required
Thai PCD Surface
Notification 2/2537 — Class 1–5
Thai PCD Effluent
Industrial discharge Type A/B/C
WHO Drinking Water
Guidelines for chemical & microbial
US EPA Aquatic Life
National recommended water criteria
EU WFD
Water Framework Directive priority list
NSF WQI
Brown et al. 1970 weighted index
Compare With Desktop Software
A pocket toolkit at a fraction of the price
Mobile-first water quality + WQI
$1,500–15,000$29.99
Hydraulic sizing + headloss
$500–5,000Included
Aeration design + blower sizing
$1,000+Included
Thai PCD + WHO + EPA + EU library
Multiple sourcesBuilt-in
Subscription
$200–500/yrOne-time
More Than Just Calculators
A complete reference toolkit in your pocket
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Pass / Fail Verdicts
Clear status on every check — WQI grade, BOD limit, velocity range, oxygen demand & effluent compliance.
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Step-by-Step Output
See intermediate values, formula references, and the full calculation sequence — not just final numbers.
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100% Offline
Works on remote sites with no signal. Every calculation runs locally — nothing is sent to any server.
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Calculator Guides
Every tool has a built-in guide explaining what it does, how it works, key terms, and a worked example you can auto-fill.
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Quick Switch
A bottom-sheet ToolNavigator lets you jump between calculators without going back to Home.
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14 Languages
English, Thai, Japanese, Korean, Chinese, Spanish, Portuguese (Brazil), French, German, Hindi, Indonesian, Italian, Russian & Arabic.
Why VerWater?
Built by engineers, for engineers
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Deterministic calculations — same input always gives the same output. No AI guesswork, no hallucinated formulas or limits.
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Thai PCD built-in — surface water classes & industrial effluent Type A/B/C verbatim from Notification 2/2537.
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Works on-site — 100% offline. Use it at the plant, at a remote intake, or during regulatory inspections.
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NSF WQI accuracy — full Brown 1970 curve set. Match published reference values within typical chart-read tolerance.
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No subscription — pay $29.99 once, use forever. Every calculator and standard unlocked from day one.
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No ads, no tracking — your sample data stays on your device. Privacy by design.
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Scenario savings — save calculations locally, revisit and compare alternatives without re-entering data.
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Multi-standard reference — Thai PCD, WHO, EPA & EU benchmarks side-by-side in a single app.
Available in 14 Languages
Reaching environmental engineers worldwide
English
🇹🇭 Thai
🇯🇵 Japanese
🇰🇷 Korean
🇨🇳 Chinese
🇪🇸 Spanish
🇧🇷 Portuguese
🇫🇷 French
🇩🇪 German
🇮🇳 Hindi
🇮🇩 Indonesian
🇮🇹 Italian
🇷🇺 Russian
🇸🇦 Arabic
Government information sources: Regulatory thresholds shown in this app are reproduced from publicly available official sources for engineering reference:
Government affiliation disclaimer: VerWater is an independent engineering reference tool published by AI Visibility Rights. This app is NOT affiliated with, endorsed by, or sponsored by the US Environmental Protection Agency (EPA), the World Health Organization (WHO), the European Union, the Thailand Pollution Control Department, or any other government entity. Agency names and standard references identify public-domain technical methodology only. For legally binding regulatory compliance, consult the original sources linked above.
Professional disclaimer: For reference only. All calculations and regulatory references should be verified by a licensed professional engineer or compliance officer before use in any project, permit, or report. This app does not replace professional engineering judgment or regulatory consultation.
Clean water demands precision. So should your tools.
Comprehensive water & wastewater engineering suite. Multi-standard compliant. 14 languages. Completely offline.