// SCORE BREAKDOWN
Highly specialized engineering toolkit with textbook-accurate calculations, solves real professional need offline, but very narrow audience.
// ABOUT
VerWater is a professional mobile app combining Water Quality Assessment, Wastewater Analysis, Hydraulics, Treatment Design, and Regulatory Standards into one powerful, offline-first toolkit. Built for environmental engineers, consultants, and plant operators — textbook-accurate results, anywhere. WATER QUALITY INDEX (NSF) - NSF WQI by Brown et al. (1970) curve-based method - DO, BOD, pH, nitrates, phosphates, turbidity, fecal coliform, TDS, temperature change - Auto classification from Excellent to Very Bad - Compare against global and local benchmarks 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 SYSTEM DESIGN - O2 demand for carbonaceous and nitrification - SOTR/AOTR with alpha, beta, theta factors - Diffuser selection, blower power, energy cost HYDRAULICS, NPSH AND 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 (SAFE / MARGINAL / RISK) - Water Hammer (Joukowsky / Michaud) with pipe material library and pressure rating check OPEN CHANNEL FLOW (MANNING) - Discharge or normal depth for rectangular, trapezoidal, triangular, circular channels - Auto Froude regime (subcritical / critical / supercritical) - Roughness library: concrete, brick, earth, gravel, riprap, natural streams DISINFECTION - USEPA SWTR CT calculator — Giardia, Virus, Cryptosporidium guidance - Trilinear interpolation across temperature, pH, and chlorine residual - First-order Chlorine Decay in distribution mains (bulk and wall) - Compliance check against minimum residual SEDIMENTATION - Settling velocity — auto Stokes / Allen / Newton regime - Sedimentation Tank designer — Surface Overflow Rate, Detention Time, Weir Loading Rate - Primary and secondary clarifier compliance bands (Metcalf and Eddy) STORMWATER - Rational Method peak flow with composite runoff coefficient editor - Time of Concentration via Kirpich and NRCS Lag (conservative) - Runoff coefficient library for urban and rural surfaces REGULATORY STANDARDS - USEPA SWTR Disinfection CT (Giardia 3-log, Virus 4-log) - WHO Drinking Water Guidelines - US EPA Aquatic Life Criteria - EU WFD Priority Substances - Thai PCD Surface Water (Class 1-5) and Effluent (Type A/B/C) - Automated compliance check against discharge limits CALCULATOR GUIDES - Every tool ships with a built-in guide — what it is, how it works, key terms, when to use, worked example. - Learn engineering methods while you compute. WHY NOT AI? - Built-in comparison page explains where VerWater beats AI chatbots: verified accuracy, instant offline results, reproducible calculations for reports. WHY VERWATER? - 100% Offline — no internet required - Professional Accuracy — formulas from Metcalf and Eddy, Wylie and Streeter, USEPA, ASCE/WEF - Precision over Hallucination — deterministic equations, not AI guessing - One-Time Purchase — full suite, no subscriptions - Step-by-step results for preliminary engineering reports DISCLAIMER: For reference and educational purposes only. All engineering designs must be verified by a licensed professional.