Environmental science tools
Monitoring, toxicity, treatment, carbon and conservation. 16 free tools, with no sign-up. Nothing you enter leaves your device.
Environmental monitoring 3
- Non-detect statisticsWork out the mean, median, upper percentiles and an upper confidence limit for lab results that include non-detects ("<1", "ND"), even with several detection limits. Uses Kaplan–Meier, robust ROS and maximum likelihood instead of substituting half the limit, compares every method side by side, and counts results above a guideline. #153
- Water quality indexTurn a season of water lab results into one score from 0 to 100 using the CCME water quality index method. Enter the objectives that apply to your water and the results for each sample. See how many variables and tests failed and by how much, the score and its category, and which samples failed. #156
- Field sampling plannerPlan where to take field samples. Draw your site boundary, work out how many samples you need (to estimate an average, compare with an action level, or find a hot spot of a given size), and lay the points out on a square or triangular grid, stratified random or simple random. Download the points as CSV or as GPX for a GPS. #158
Ecotoxicology 3
- LC50 probit analysisFind the LC50 or EC50 from a toxicity test where a number of organisms die or respond at each concentration. Fit a probit or logit line by maximum likelihood, correct for deaths in the control, and get LC10, LC50, LC90 or any other level with 95 % fiducial limits, the slope, a goodness-of-fit test and plots. #151
- Species sensitivity distributionTurn toxicity values for many species into one protective concentration. Fit a species sensitivity distribution (log-normal, log-logistic or their AICc average), read off the HC5 or any other HCp with bootstrap limits, see the fraction of species affected at any concentration, and plot every species on the curve. #152
- Bioaccumulation factor calculatorWork out a kinetic bioconcentration factor from a fish test: fit the uptake rate k1 and depuration rate k2 to your time course and get BCF = k1/k2 with a confidence interval, half-life, time to steady state, steady-state BCF, growth correction and lipid normalisation. Or get the trophic magnification factor of a food web from trophic levels and concentrations. #159
Environmental engineering 4
- Landfill gas estimatorEstimate the methane and landfill gas a site makes each year from the tonnes of waste placed. Uses the first-order decay model with your decay rate k and methane potential L0. Shows the peak, the gas flow in m³/h, how much a collection system captures, the power it could make, and the methane and CO2-equivalent emitted. #154
- Detention pond routerSize a stormwater detention pond. Build the inflow with the modified rational method or paste a hydrograph, set the pond shape, orifice and overflow weir, and route the storm through it. See the peak outflow, how much it is cut, the highest water level, storage used and drain time. The tool can also find the orifice size that meets a target peak outflow. #155
- Activated sludge sizerSize an activated sludge aeration tank for BOD removal. Give the flow, influent BOD, sludge age (SRT), MLSS and kinetic coefficients, and see the effluent BOD, tank volume and detention time, F/M ratio, sludge production, oxygen demand, air flow, return and waste sludge flows, and how they all change with sludge age. #157
- Noise barrier calculatorWork out how much a noise barrier cuts the sound at a receiver. Give the heights and distances of the source, barrier and receiver and the sound spectrum without the barrier, and see the path difference, Fresnel number and insertion loss in each octave band, the A-weighted level before and after, and a drawing of the cross-section. #160
Carbon and energy accounting 4
- Tree carbon calculatorEstimate the carbon and CO₂ stored in trees, and how much they take up each year. Enter each tree's trunk diameter (DBH) and height, an allometric equation for your species, a root-to-shoot ratio and a carbon fraction. See biomass, carbon, CO₂e for every tree and in total, and yearly uptake from two measurements or a growth rate. #161
- Life cycle comparison (LCA lite)Compare two products, such as a reusable and a single-use one, across life stages (materials, manufacturing, transport, use, end of life) with your own emission factors. See the totals for any number of uses, the break-even point, a stacked bar by stage, which input would flip the result, and how sure the answer is when the factors are uncertain. #162
- Carbon footprint calculatorAdd up a household's yearly carbon footprint from electricity, heating fuel, car and transit, flights (great-circle distance from coordinates), food and goods. Every emission factor is yours to set; the defaults are rounded examples to replace with your country's official factors. See the breakdown, compare scenarios, and download CSV, PDF or Word. #505
- Scope 1, 2 and 3 emissions calculatorBuild a small organisation's greenhouse gas inventory from activity rows (fuel, refrigerant leaks with your GWP, electricity, travel, commuting, purchased goods) times your own emission factors. Totals by scope and category, Scope 2 both location- and market-based, tonnes per employee and per million of revenue, year-on-year change, CSV in and out and a PDF or Word report. #506
Conservation science 2
- Habitat connectivity analyserPaint a small land-cover map or open one (CSV grid, ASCII grid or PNG), give each class a resistance, and find the habitat patches, least-cost distances between them, links under a dispersal distance, components, the IIC and PC connectivity indices, each patch's importance (dIIC, dPC) and the least-cost path between any two patches. #511
- Camera-trap taggerOpen a folder of camera-trap photos (never uploaded). The page reads each photo's EXIF time, groups bursts into events, and lets you tag species, count and behaviour with one key. It works out independent detections, detections per 100 trap-nights (RAI), naive occupancy and activity by hour, and exports CSV. Tags can be kept in this browser. #856
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