The Global Centre for Risk and Innovation (GCRI)
Maps are published here once their data rights are cleared and they have been reviewed. Each shows its time and space reference, its sources and its uncertainty.
Basin B · Layers 8 · Scale 1:38,000
schematic · placeholder geography
| Reservoir storage | OBSERVED | On |
| SPI-3 | DERIVED | On |
| Non-revenue water | REPORTED | On |
| E. coli compliance | OBSERVED | Off |
| Administrative… | OFFICIAL | Off |
Water Nexus · Map workspaceMap workspace, in outline: domain structure with placeholder names and illustrative values, not a record.
Water Nexus released maps are reviewed map views of water, published once their data rights are cleared, each with its coordinate reference, date, sources and uncertainty. Layers draw on sources such as HydroSHEDS and HydroBASINS. A map shows released, rights-cleared evidence, not a live feed or an official warning.
Fig.A programme from scoping to the owner's decision. Design, not a record.
Rivers, lakes and how far each division sits from mapped surface water, shown for the Ganges and Brahmaputra Basin as an example geography for this subject.
| Indicator | Unit | Cadence | Evidence label | Topic |
|---|---|---|---|---|
| Standardised precipitation index | dimensionless (3, 6, 12 month) | monthly | Estimated | Drought and flood |
| Soil moisture anomaly | percent of climatology | weekly | Modelled | Drought and flood |
| Streamflow percentile | percent of period of record | daily | Observed | Drought and flood |
| Reservoir storage | percent of live capacity | daily | Official | Drought and flood |
| Groundwater level anomaly | metres below mean | monthly | Observed | Drought and flood |
| Flood return period of peak flow | years | per event | Estimated | Drought and flood |
| Inundated area | square kilometres | per event | Observed | Drought and flood |
| Population in the flood extent | persons | per event | Estimated | Drought and flood |
| Catchment precipitation | millimetres per month | monthly | Estimated | Catchment hydrology |
| Actual evapotranspiration | millimetres per month | monthly | Modelled | Catchment hydrology |
| Runoff coefficient | dimensionless | seasonal | Estimated | Catchment hydrology |
| Baseflow index | dimensionless | annual | Estimated | Catchment hydrology |
| Flow duration curve percentiles | cubic metres per second | period of record | Observed | Catchment hydrology |
| Water yield | millimetres per year | annual | Modelled | Catchment hydrology |
| Depth to water table | metres below ground | monthly | Observed | Groundwater and aquifers |
| Terrestrial water storage anomaly | centimetres equivalent water height | monthly | Estimated | Groundwater and aquifers |
| Abstraction | cubic metres per year | annual | Official | Groundwater and aquifers |
| Recharge estimate | millimetres per year | annual | Modelled | Groundwater and aquifers |
| Land subsidence rate | millimetres per year | annual | Observed | Groundwater and aquifers |
| Electrical conductivity and chloride | microsiemens per centimetre; milligrams per litre | quarterly | Observed | Groundwater and aquifers |
| Border-crossing flow | cubic metres per second | daily | Official | Shared river basins |
| Reservoir storage in the basin | cubic kilometres | monthly | Estimated | Shared river basins |
| Sediment load | tonnes per year | annual | Estimated | Shared river basins |
| Delta salinity intrusion length | kilometres | dry season | Observed | Shared river basins |
| Basin precipitation by country | millimetres per month | monthly | Estimated | Shared river basins |
| Environmental flow compliance | percent of months meeting the agreed flow | annual | Official | Shared river basins |
| Continuity of supply | hours per day | daily | Observed | Water utilities |
| Non-revenue water | percent of system input volume | monthly | Official | Water utilities |
| Energy intensity | kilowatt hours per cubic metre | monthly | Observed | Water utilities |
| Residual chlorine compliance | percent of samples in range | monthly | Official | Water utilities |
| Raw-water turbidity | nephelometric turbidity units | continuous | Observed | Water utilities |
| Days of storage at current demand | days | daily | Official | Water utilities |
| Backup power endurance | hours | per asset | Official | Water utilities |
| Population with safely managed drinking water | percent | annual | Official | Drinking water and sanitation |
| Population with safely managed sanitation | percent | annual | Official | Drinking water and sanitation |
| E. coli detection in supply samples | percent of samples positive | monthly | Observed | Drinking water and sanitation |
| Arsenic and fluoride exceedance | percent of sources above guideline | survey | Observed | Drinking water and sanitation |
| Intermittency | hours of supply per day | daily | Observed | Drinking water and sanitation |
| Persons per functioning water point | persons | per site | Estimated | Drinking water and sanitation |
| Hydropower generation against inflow | gigawatt hours; cubic metres per second | daily | Official | Water energy interdependence |
| Cooling-water temperature margin | degrees Celsius below the permit limit | daily | Observed | Water energy interdependence |
| Energy intensity of water supply | kilowatt hours per cubic metre | monthly | Observed | Water energy interdependence |
| Water intensity of generation | litres per megawatt hour | annual | Official | Water energy interdependence |
| Coincident peak index | dimensionless | daily | Estimated | Water energy interdependence |
| Reserve margin at evening peak | percent | daily | Official | Water energy interdependence |
| Irrigated area and water use | hectares; cubic metres per hectare | seasonal | Estimated | Water food ecosystem links |
| Crop water stress | dimensionless index | weekly | Modelled | Water food ecosystem links |
| Wetland extent | square kilometres | seasonal | Observed | Water food ecosystem links |
| Nutrient load at the basin outlet | tonnes of nitrogen and phosphorus per year | annual | Estimated | Water food ecosystem links |
| Inland fish catch | tonnes per year | annual | Official | Water food ecosystem links |
Analysis runs in Nexus Foundry; reviewed releases are listed here.
Each term as this page uses it. Where a standard-setting body defines the term, the wording follows that body.
| Term | Definition |
|---|---|
| Coordinate reference system | The definition that ties coordinates to locations on Earth, catalogued with EPSG codes. |
| Modifiable areal unit problem | The change in statistical results that comes from how areas are drawn and aggregated. |
| Zonal statistics | Statistics of raster values summarised within boundaries such as districts. |
| Public-safe release | A recorded decision on the detail at which a layer may be published without exposing sensitive sites or people. |
The bodies and documents this page is read against. Status and editions change; each link goes to the issuing body.
The current service level is R0: information and enquiries. An enquiry receives a reference and names the next step; applications, payments, compute allocations and registrations open only when their team, terms and review capacity exist.