Environment and Water Simulators

Activated Sludge CSTR Simulator: A real-time activated-sludge calculator built on Monod kinetics and a completely-mixed (CSTR) steady-state mass balance. Mov…

Model ground-level air pollution from stack emissions with Gaussian plume dispersion, Briggs plume rise, and real-time concentration mapping.

Air Quality Index (AQI) Simulator: Enter the concentrations of PM2.5, PM10, ozone, NO2 and SO2, and this tool computes the US EPA Air Quality Index by piecew…

Real-time AQI calculator for PM2.5, PM10, NO2, O3, and CO. Visualize pollutant levels against WHO guidelines with a bar chart and health category indicator.

Size the iron-oxide adsorption process used to treat arsenic-contaminated groundwater in Bangladesh, India, the US Southwest and other regions.

Trickling Filter / Biofilter Design Simulator: Size a trickling filter — the classical fixed-film bioprocess that treats wastewater on a biofilm that grows o…

Biofilter VOC Removal & EBRT Residence Time Simulator: A concept-design tool for biofilters that remove gas-phase VOCs and odors through microbial metabo…

Size a bioretention cell — also known as a rain garden — in real time.

Calculate annual CO₂ emissions from electricity, transport, and heating. Compare against climate targets and identify reduction priorities with this carbon footprint calculator tool.

Calculate CO2 emissions from electricity, transport, and lifestyle. Set reduction targets with carbon neutrality calculator and lifecycle assessment tools.

Estimate cleanroom particle recovery time from air-change rate, effective removal efficiency, initial concentration, and target fraction.

CCS Amine CO₂ Absorber Design Simulator: Design the giant amine absorber that scrubs CO₂ out of power-plant, steel, and cement flue gas. Adjust flue-gas flow…

Calculate CO2 emissions for electricity, gas, transport & materials. Use IPCC methodology to compute your net-zero timeline with our free LCA tool.

Coagulation flocculation G value simulator for screening mixing conditions, power density, and energy input in water treatment design.

Constructed Wetland Wastewater Treatment Simulator: Design a constructed wetland that uses plants, soil and microbes to polish wastewater. Adjust the flow, i…

Estimate reverse-osmosis SEC, feed/brine flow, and energy recovery benefit from pressure, recovery ratio, and ERD efficiency.

Direct Air Capture (DAC) CO₂ Removal Simulator: Design a Negative Emissions Technology (NET) plant that pulls CO₂ straight out of the air. Choose between liq…

Fish Passage Velocity Barrier Simulator: Design fishways that let salmon and trout climb past dams and weirs. Adjust the target species, body length, water t…

Fish Pond Aerator Dissolved Oxygen Simulator: Size a pond aerator from a dissolved-oxygen (DO) balance. Adjust pond geometry, fish species, stocking density,…

Fishery MSY Stock Assessment Simulator: For major fish stocks — cod, bluefin tuna, herring and anchovy — this tool computes Maximum Sustainable Yield (MSY), …

Forest Biomass Allometric Equation Simulator: Estimate above- and below-ground biomass, carbon stock, annual CO₂ sequestration and carbon-credit value for a …

Gaussian plume simulator for atmospheric dispersion modeling. Calculate downwind pollutant concentration using Pasquill stability classes and real-time parameter adjustment.

Glacier Mass Balance & ELA Simulator: A health check for mountain glaciers and ice caps. Enter the glacier area, equilibrium-line altitude (ELA), accumul…

Greenhouse Effect Simulator: adjust CO2 concentration and solar constant to model Earth temperature changes. Climate modeling, atmospheric physics simulation.

Calculate your personal carbon footprint with our CO₂e calculator. Compare your emissions from energy, travel, diet, and waste to the global average of 7 tonnes per year.

Indoor Radon Concentration & Mitigation Simulator: Estimate the indoor concentration of Radon-222 seeping from granite or sedimentary soils into basements an…

LandGEM landfill gas simulator estimates methane generation, peak year, and emissions from waste data using EPA model. Landfill gas forecasting tool.'s LandGEM (Landfill Gas Emissions Model) v3.02, this tool estimates a landfill's methane generatio…'s LandGEM (Landfill Gas Emissions Model) v3.02, this tool estimates a landfill's methane generatio…

Sum the CO₂ emissions of a product across its full life cycle, from material production to disposal and recycling.

Compare microfiltration, ultrafiltration, nanofiltration and reverse osmosis on a single screen.

Nitrogen Fertilizer Leaching to Groundwater Simulator: Estimate how much of the nitrogen applied to a field is taken up by the crop, lost to the air as ammon…

Ozone Depletion & ODS Simulator: Interactively compute the ODP, GWP, atmospheric lifetime, CFC-11 equivalent and CO2 equivalent emissions, and the projected …

Ozone Water Treatment Simulator — AOP, Bromate & CAO Contactor Sizing: Evaluate drinking-water and water-reuse ozone (O₃) treatment in real time: CT value, b…

Ozone & UV Disinfection (CT, IT) Simulator: Design the disinfection step of a drinking-water or wastewater treatment train using CT (concentration × time) or…

Estimate basin runoff depth and peak flow using the USDA SCS Curve Number method. Adjust CN, AMC, and basin parameters for stormwater and flood analysis.'s direct runoff depth, runoff coefficient and …

Design a system that collects rain off a roof, stores it and uses it for toilet flushing and garden irrigation.

When treated sewage or industrial effluent is discharged into a river, the river dilutes it.

Saltwater Atmospheric Icing on Power Lines & Ships Simulator: Estimate ice accretion on overhead power lines, ship decks, wind-turbine blades and offshor…

Simulate seawater desalination processes. Calculate osmotic pressure, recovery ratio, and energy use. Compare RO, MSF, and MED technologies in real time.

Snow Avalanche α-β Runout Distance Simulator: Use the Lied-Bakkehøi (1980) statistical regression α = 0.96β − 1.4° to predict the farthest reach (α point), p…

Snowmelt Degree-Day Method Simulator: Estimate daily snowmelt, basin meltwater discharge and snow water equivalent (SWE) depletion in a mountain catchment us…

Soybean Germination Rate Temperature & Moisture Model: Soybean emergence is governed by the combination of soil temperature, moisture, sowing depth and compa…

Free Rational Method calculator: estimate the peak stormwater runoff Q = C·i·A from a small catchment and check the drain pipe with Manning's equation. Vary catchment area, runoff coefficient, rainfall intensity, pipe diameter and slope to design drainage that won't overflow.

Stream Restoration & Bankfull Discharge Simulator: A planning tool for restoring engineered, straightened streams back to their natural form. Adjust drainage…'s n. Plan stream-restoration projects.

Swimming Pool Chlorine Decay & CT Value Simulator: From free residual chlorine, pH, water temperature and bather load, this tool computes the HOCl efficacy f…

Floating Roof Tank Rim Seal VOC Emission Simulator: A web tool that converts the operating parameters of an external or internal floating roof tank into an a…

From an EF rating (EF0-EF5) and debris mass, projected area and shape, compute drag, lift-off critical wind, terminal velocity, impact kinetic energy and the resulting b…

Tsunami Run-up Height Prediction Simulator: Vary the moment magnitude Mw, epicenter distance, offshore wave height, coastal slope, shoreline geometry and veg…

Urban Heat Island (UHI) Intensity Simulator: Estimate the urban heat island intensity ΔT — the extra warmth of a city centre relative to its surrounding rura…

Membrane Bioreactor (MBR) Wastewater Design Simulator: Size a membrane bioreactor (MBR) and watch the reactor volume, required membrane area, permeability, f…

Wastewater UV Disinfection Fluence Simulator: Design a UV-C disinfection reactor for municipal or industrial wastewater. Adjust flow, UVT, lamp type, lamp co…

River DO/BOD Water Quality Simulator: When sewage or industrial wastewater enters a river, microbes oxidize the organic matter and drain dissolved oxygen (DO…

Optimize water treatment with interactive coagulation, filtration and chlorination calculators. Visualize turbidity, headloss and disinfection performance.

Wet Venturi Scrubber Particle Removal Simulator: A Venturi wet scrubber forces high-velocity flue gas through a narrow throat where water is injected, so dus…

Wind Chill Calculator: Set air temperature and wind speed to calculate apparent temperature (wind chill) in real time. Check frostbite risk and use wind-spee…

Wind-Driven Rain Facade Loading Simulator: Estimate Wind-Driven Rain (WDR) on building facades from Choi (1994). Adjust rainfall, wind speed, droplet diamete…