Tell us what to change or add.
Open a decision below. Check the area, period, inputs, result and proposed next step.
Use Change example to try different values. Use Data needed to check the fields and sources. The land-use change decision has its own comparison views.
Record your corrections below, then download your answers or print them.
Review comparable groundwater-head observations before planning a well investigation.
Validation required
Fictional default example · 2025.
What the selected record shows. Observed value: 100.9 m.
Next step. Check source and period comparability before using the trend. Prepare trend report in the prototype creates a visible, downloadable draft. It is unassigned and not sent.
Head, datum and pumping state must match; a short series does not establish sustainable abstraction.
Display observations in dated order. Sample SD uses n−1; coefficient of variation = 100 × SD / positive mean.
Groundwater head and depth below ground have opposite directional meanings. Match datum, pumping state and seasonal context; observed drawdown is not itself a safe-yield estimate. Heads refer to an arbitrary stated datum. Compare pumping state, season and measurement method; do not calculate relative percentage or infer sustainable abstraction.
Other required records: Well ID; groundwater level; datum; pumping history; rainfall; observation dates.
Calculation appendix
Compare groundwater head with the supplied matching seasonal reference.
What the selected record shows. Difference: -1.5 m.
Next step. Check the unusual observation and its comparison basis. Prepare investigation brief in the prototype creates a visible, downloadable draft. It is unassigned and not sent.
A departure does not by itself identify recharge change or pumping effects.
Head difference = observed head − comparable seasonal reference head, in metres on the same datum. The datum has an arbitrary zero; a relative percentage is not reported.
Other required records: Well ID; water levels; season; abstraction; rainfall; comparable baseline.
Check the reported well-water sample against its use-specific comparison bounds.
What the selected record shows. The supplied Well-water chloride for selected use result is 230 mg/L. Its stated comparison range is 0 to 200 mg/L. Outside example comparison bounds.
Next step. Obtain the missing evidence listed below. Prepare evidence request in the prototype creates a visible, downloadable draft. It is unassigned and not sent.
The fictional bounds do not establish water safety or legal compliance.
Compare the measured value only with matching parameter, unit, use and averaging period. Retain limit source/version and censored-result status.
Example bounds establish no compliance or diagnosis. Ambient, drinking-water, effluent, crop, food, air and noise standards are not interchangeable. A censored result is not an exact zero. Physical concentrations and magnitude measurements are non-negative. Signed raw instrument signals need laboratory interpretation; do not silently replace them with zero.
Other required records: Well sample; parameter; result; unit; laboratory method; applicable limit.
Find aquifer units without confirmed observation-well coverage.
What the selected record shows. 30 aquifer units are known to be uncovered; 5 have unknown coverage. 65% are confirmed covered.
Next step. Check the records behind the uncovered and unknown groups. Prepare coverage follow-up in the prototype creates a visible, downloadable draft. It is unassigned and not sent.
Coverage does not establish well placement, condition or representativeness.
100 × distinct covered eligible units / eligible frame. Known uncovered = frame − covered − unknown.
Count each eligible unit once for the selected service and period. Received messages, attendance, adoption and outcomes are separate measures.
Other required records: Aquifer units; existing wells; observation dates; abstraction areas; coverage need.
Find missing geological, geophysical and access evidence for a groundwater investigation.
What the selected record shows. The required evidence is incomplete for this borehole siting case. The items below identify what must be obtained or reconciled.
Checklist completeness does not establish drilling suitability or yield.
Check each required item and retain its reference. A documented item is not a scientific, legal or institutional approval.
Evidence completeness alone cannot establish suitability, eligibility, safety, permission or method validity.
Other required records: Geology; geophysics; nearby wells; demand; contamination risks; land access.
Check whether supplied pumping-test values can be independently reproduced.
What the selected record shows. Difference: -10 m³/day. Investigate reproduction difference.
Next step. Investigate reproduction difference. Prepare reproduction-check note in the prototype creates a visible, downloadable draft. It is unassigned and not sent.
A matching calculation does not establish a safe abstraction rate.
Reproduced minus expected result, within an explicitly supplied absolute tolerance, using the same exact input/method versions and a separate checker. Retain originals, code, parameters and environment evidence.
Reproducing a supplied pumping-test result does not establish sustainable yield or authorize abstraction. Drawdown, recovery, duration, interference and water-quality evidence remain necessary.
Other required records: Pumping rate; drawdown; recovery; test duration; aquifer model; uncertainty.
Reconcile the supplied aquifer inflows, outflows and closing-storage observation.
What the selected record shows. Calculated closing storage are 164,000 m³. The recorded closing observation is 163,500 m³; recorded minus calculated is -500 m³. Check the component records before explaining that difference.
Next step. Reconcile closing balance. Prepare balance review in the prototype creates a visible, downloadable draft. It is unassigned and not sent.
A balance does not establish sustainable yield without a reviewed aquifer model.
Calculated closing = opening + inflows − releases/transfers − other outflows. Residual = independently observed closing − calculated closing.
A storage-change calculation needs a defined aquifer boundary and compatible volume estimates. Groundwater head in metres is not a storage volume; uncertainty and safe-abstraction review remain separate.
Other required records: Recharge estimate; abstraction; inflows; outflows; storage change; uncertainty.
Review documented source-to-well separation with flow-direction and protection evidence.
What the selected record shows. Documented separation: 150 m.
Next step. Check the matching footprint, source boundary and applicable conditions. Prepare overlap review in the prototype creates a visible, downloadable draft. It is unassigned and not sent.
Distance alone does not establish contamination or a safe protection zone.
Display measured separation with hydrogeological direction, source type and the reviewed protection criterion. Distance alone cannot determine contamination, safety or a statutory protection area.
Geometry preparation must use matching coordinate systems, dated boundary editions and valid spatial predicates. Overlap supports referral; it does not determine ownership, permission or site safety.
Other required records: Well coordinates; land uses; hazard sources; protection criteria; flow direction.
Review comparable conductivity observations for a salinity investigation.
What the selected record shows. Observed value: 1,800 µS/cm.
Conductivity alone does not identify seawater intrusion or its cause.
Match definitions, methods, grade, location and reference basis. Gaps are not joined. Descriptive variation is not a forecast, causal effect or significant trend. These are fictional coastal examples outside Knuckles. Conductivity is not a chloride concentration or proof of saline intrusion; sampling and hydrogeological evidence are needed.
Other required records: Conductivity; chloride; groundwater head; pumping; location; tidal influence.
Find missing demand, hydrogeological and permit evidence for an industrial request.
What the selected record shows. The required evidence is incomplete for this industrial abstraction case. The items below identify what must be obtained or reconciled.
The prototype does not authorise groundwater abstraction.
Other required records: Demand; hydrogeological report; abstraction proposal; permits; monitoring conditions.
Compare managed-recharge choices using geology, water quality and site constraints.
What the selected record shows. There is not enough information to choose this option. Obtain the records and evidence about conditions listed below. The supplied budget less cost is 300,000 LKR.
Next step. Obtain the missing records before choosing. Prepare evidence request in the prototype creates a visible, downloadable draft. It is unassigned and not sent.
Budget and descriptive benefits do not establish recharge feasibility or safety.
Compare each alternative's stated benefit, adverse effects, domain evidence and mandatory constraints. Where cost and budget are supplied, budget balance = budget − option cost. A budget balance alone does not determine domain feasibility or select an option.
Other required records: Site geology; source-water quality; recharge volume; costs; controls; feasibility.
Compare groundwater-head changes around extraction and comparison observations.
Verified published formula · Difference-in-differences arithmetic
What the selected record shows. Treatment change: 17; comparison change: 7; difference in changes: 10 m. This comparison alone does not establish causation or benefit.
A difference in changes does not establish an extraction effect.
(Treatment after−before) − (comparison after−before), using the same outcome definition and periods.
The arithmetic alone does not establish causation. Design, parallel trends, confounding, attrition, uncertainty and adverse effects need appropriate evidence.
Other required records: Mine activity; well levels; water quality; baseline; comparison wells; geology.
World Bank · Impact Evaluation in Practice Second EditionInstitution publication · Chapter 7, table 7.2, printed page 140, PDF page 170
The formula is verified. Causal interpretation still requires a defensible study design, comparison and assumptions.
Identify well-rehabilitation cases past their recorded response date.
What the selected record shows. Open days past due: 29 days. Follow up overdue case.
Next step. Follow up overdue case; confirm the missing condition evidence. Prepare evidence request in the prototype creates a visible, downloadable draft. It is unassigned and not sent.
Age alone does not establish the best repair or its urgency.
Open age = assessment date − received date. Days past due = max(0, assessment date − recorded due date) for open cases. Show documented critical conditions separately.
Example due dates are not legal service standards. Do not alter statutory deadlines by silently subtracting pauses, or infer severity from age alone.
Other required records: Well condition; yield; sand production; failure history; repair options; costs.
Identify groundwater laboratory cases past their recorded response date.
A deadline does not establish sample validity or the cause of delay.
Other required records: Sample ID; receipt; required tests; holding time; due date; lab capacity.
Compare tested contingency supplies using yield, quality, rights and delivery constraints.
Cost alone does not establish a dependable or safe supply.
Other required records: Demand; verified yields; water quality; transport; costs; authorized abstraction.
Compare drilling cost per completed metre with documented yield and outcome evidence.
What the selected record shows. Cost per drilled metre: 30,000 LKR/m.
Next step. Check matching outputs, denominators and operating conditions. Prepare performance comparison in the prototype creates a visible, downloadable draft. It is unassigned and not sent.
A low drilling cost does not establish a successful or sustainable well.
Drilling cost / completed depth. Display tested yield and the stated success definition separately; cost per metre does not determine safe abstraction.
Other required records: Borehole ID; depth; yield; geology; drilling cost; success definition.
Find missing or overdue logger observations before a data-recovery referral.
What the selected record shows. Completeness: 80 %. Check overdue observation.
Next step. Check overdue observation. Prepare observation request in the prototype creates a visible, downloadable draft. It is unassigned and not sent.
Reporting completeness does not establish calibration or measurement quality.
Completeness = 100 × valid / expected. Age = assessment date − latest valid observation; compare with the explicitly supplied interval.
A recent observation does not fill earlier gaps. Unknown schedule or observation time cannot establish freshness.
Other required records: Logger ID; expected cadence; last valid reading; calibration; power; access.
Check sensitivity, ownership and use conditions for a groundwater-information request.
What the selected record shows. The required evidence is incomplete for this public evidence case. The items below identify what must be obtained or reconciled.
A complete checklist does not permit release of restricted well locations.
Other required records: Dataset; location sensitivity; ownership; intended use; license; approval.
Compare supplied aquifer-model predictions and independently reproduced heads.
What the selected record shows. Difference: -0.2 m. Investigate reproduction difference.
Reproduction does not validate predictive performance or model fitness.
Reproduced groundwater head minus expected groundwater head, in metres on the same datum. Compare the stated absolute tolerance and exact versions. No relative percentage or coordinate/model execution is reported.
Other required records: Model; boundary conditions; pumping; calibration levels; independent validation; uncertainty.
Find missing well identifiers, datum and construction references.
What the selected record shows. The required evidence is incomplete for this well registry case. The items below identify what must be obtained or reconciled.
Complete metadata do not establish a reliable groundwater measurement.
Other required records: Well ID; location; depth; screen interval; datum; construction date; source.
Check which existing source fields can supply the decision inputs.
Existing form reference: ce5ed1b99bb3102f
Existing form reference: 8d60801843516765
Existing form reference: ba56f4a118b8defb
Existing form reference: f173e69599dc5331
Existing form reference: aab19eb1fe26e99f
Existing form reference: f0192290b75919c0
Existing form reference: ccd11935ddd740eb
Existing form reference: 8123426118305c93
Existing form reference: 46072ad6caa5f83d
Existing form reference: 66361481a1066277
Existing form reference: f38ab955cf2f6bd4
Existing form reference: 1bb76fa1770b0049
Existing form reference: d15540e8ecb12c69
Existing form reference: 0f0d24cef4bd6481
Existing form reference: dd591850f1e639e2
Existing form reference: 70efb0310e727bec
Existing form reference: a23c11282c20ec1d
Existing form reference: 7caa76b009c9aa66
Existing form reference: d89ee67747f1e131
Your institution has its own document and image library. Use the same library for reports, photos and other evidence.
Open this screen for Water Resources BoardSee the presentation example
Files added in the prototype stay in this browser. Public sharing is an access preview. Existing public reference links already work online.
Data structure keeps the existing source tree, records, charts and map. Manage structure adds a place to propose changes to definitions.
An entity type means a kind of thing or event, such as a reservoir or an inspection. Drafts stay in this browser. A demo approval does not change real definitions, data, chart links or sharing rights.
User management shows example profiles for each institution. People and Roles and access let you review the proposed account screens.
These are interface previews only. They create no account, send no email and change no access. Use example details in the preview. Institution verification does not grant a real permission.
We currently use public data and published reports where available. Please confirm whether your institution can provide data directly, so we can avoid retyping or reading figures from PDFs.
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Use the Download answers button at the top of this page. Share the downloaded file or printed copy through your agreed review channel. Nothing is sent automatically.