# VerWater — Water Engineering — WQI · Hydraulics · Aeration

> WQI · Hydraulics · Aeration (iPhone/iPad app by Jittapol Prukpatarakul.)

- Source: https://appshunter.io/ios/app/verwater-water-engineering/id6765833739 (this page in markdown: same URL + `.md`)
- Developer: [Jittapol Prukpatarakul](https://appshunter.io/developer/1876801870)
- Category: Utilities, Education
- Price: $29.99
- Age rating: 4+
- Requires: iOS 15.1 · 40 MB
- Languages: American English
- Released: 2026-05-03
- Data updated: 2026-08-26
- User reviews in markdown: https://appshunter.io/ios/app/verwater-water-engineering/id6765833739/reviews.md

## What is VerWater?

VerWater is a professional mobile app combining Water Quality Assessment, Wastewater Analysis, Hydraulics, Treatment Design, and Regulatory Standards into one powerful, offline-first toolkit for environmental engineers, consultants, and plant operators.

WATER QUALITY INDEX (NSF)
- NSF WQI by Brown et al. (1970) curve-based method
- DO, BOD, pH, nitrates, phosphates, turbidity, fecal coliform, TDS, temperature
- Auto classification from Excellent to Very Bad

WASTEWATER AND BOD/COD
- BOD5, BODu, ultimate BOD, COD removal efficiency
- Temperature and k-rate corrections (Streeter-Phelps)
- Industry auto-identification from BOD/COD ratio

AERATION DESIGN
- O2 demand for carbonaceous and nitrification
- SOTR/AOTR with alpha, beta, theta factors
- Diffuser selection, blower power, energy cost

HYDRAULICS, NPSH, WATER HAMMER
- Hazen-Williams, Darcy-Weisbach, Manning equations
- Minor losses for fittings, valves, bends
- Pump power and Affinity Laws (VFD optimization)
- NPSH Available with cavitation status
- Water Hammer (Joukowsky / Michaud) with pipe material library

OPEN CHANNEL FLOW (MANNING)
- Discharge or normal depth for rectangular, trapezoidal, triangular, circular channels
- Auto Froude regime (subcritical / critical / supercritical)
- Roughness library for urban and natural channels

DISINFECTION
- Surface Water Treatment Rule CT calculator — Giardia, Virus, Cryptosporidium
- Trilinear interpolation across temperature, pH, residual
- First-order Chlorine Decay in distribution mains
- Minimum-residual compliance check

SEDIMENTATION
- Settling velocity — auto Stokes / Allen / Newton regime
- Tank designer — Overflow Rate, Detention Time, Weir Loading Rate
- Clarifier compliance bands (Metcalf and Eddy)

STORMWATER
- Rational Method peak flow with composite runoff editor
- Time of Concentration via Kirpich and NRCS Lag
- Runoff coefficient library

REGULATORY STANDARDS
- Surface Water Treatment Rule Disinfection CT (Giardia 3-log, Virus 4-log)
- International drinking-water guidelines
- Aquatic-life water-quality criteria
- Water-framework priority substances
- Thailand Surface Water (Class 1-5) and Effluent (Type A/B/C)
- Automated compliance check

CALCULATOR GUIDES
Every tool has a built-in guide — what it is, how it works, key terms, when to use, worked example.

WHY VERWATER?
- 100% Offline — no internet required
- Formulas from Metcalf and Eddy, Wylie and Streeter, ASCE/WEF
- Deterministic equations, not AI guessing
- One-time purchase, no subscriptions

GOVERNMENT INFORMATION SOURCES
Regulatory thresholds reproduced from publicly available official sources for engineering reference:
- US Surface Water Treatment Rule (40 CFR 141): https://www.ecfr.gov/current/title-40/chapter-I/subchapter-D/part-141
- US Aquatic Life Water Quality Criteria: https://www.epa.gov/wqc/national-recommended-water-quality-criteria-aquatic-life-criteria-table
- US Primary Drinking Water Regulations: https://www.epa.gov/ground-water-and-drinking-water/national-primary-drinking-water-regulations
- WHO Drinking-water Quality Guidelines: https://www.who.int/publications/i/item/9789240045064
- EU Water Framework Directive: https://environment.ec.europa.eu/topics/water/water-framework-directive_en
- Thailand Water Quality Standards (Notification B.E. 2537): https://www.pcd.go.th/laws/

GOVERNMENT AFFILIATION DISCLAIMER
VerWater is an independent engineering reference tool by AI Visibility Rights. This app is NOT affiliated with, endorsed by, or sponsored by the US EPA, WHO, the EU, the Thailand Pollution Control Department, or any government entity. Agency names identify public-domain technical methodology only. Consult the original sources above for legally binding compliance.

DISCLAIMER: For reference and educational purposes only. All engineering designs must be verified by a licensed professional engineer.


## Version history (last 2 releases)

### 1.3.0 — 2026-06-15

v1.3 — Save, revisit, and continue your work with calculation History. Export results as PDF reports for field documentation. New Formula Library reference. Project Pack groups calculations by job or client. One-tap Try this example on every calculator. Refreshed visual design with category-grouped home and tablet-optimized layout. Fully offline, no account required.

### 1.0 — 2026-05-04

No release notes.

## More apps by Jittapol Prukpatarakul

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- [VerPhysic — Physics Calculator](https://appshunter.io/ios/app/verphysic-physics-calculator/id6760433895)
- [VerCivil: Structural Engineer](https://appshunter.io/ios/app/vercivil-structural-engineer/id6760603722)
- [VerBio — Biology Calculator](https://appshunter.io/ios/app/verbio-biology-calculator/id6760899888)

All apps by Jittapol Prukpatarakul: https://appshunter.io/developer/1876801870

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-08-26.*