Saved basin evidence · separate dataset
Inspect saved-basin passport
From water allocation to e-flow assessment
Simulates water and salt moving through storage, users and river water bodies.
Tracks heat with those transfers and demonstrates reservoir and industrial effects.
Compares each water body’s physical results with declared flow and salinity criteria.
Needs biological observations, a locally calibrated assessment index, and supporting physical evidence.
Synthetic teaching case: operating rules and assessment thresholds are assumed inputs, not requirements derived by the report methodology. Physical checks do not establish ecological status.
The connected water system
Start with the Inflow / source box to explore water quantity and quality. Click other boxes to follow water through the system; water-body labels open the matching physical inspector, with a link to its criterion assessment. Labels show the selected day’s value for the chosen indicator. On small screens, scroll the network sideways.
━ River water bodies ┄ Return flow carrying salt Grey branches supply users. Cooling consumes no water; accepted industrial heat is shown in the thermal section.
Follow today's agricultural return water and salt
| User | Diverted m³/s | Consumed / ET m³/s | Returned m³/s | Diverted salt tonnes/day | Returned salt tonnes/day | Intake → return mg/L |
|---|
Inspect every model node
Trace each source, reservoir, river node, water user and terminal. River water bodies also have expandable local e-flow checks. Daily readings follow the selected day; assessment counts cover the full synthetic year.
Selected day
| Branch at this node | Value | Unit |
|---|
Dashed lines are incoming branches (or before cooling); solid lines are outgoing branches (or after cooling). Each curve keeps its own concentration or temperature: quality values are not added together. A gap means no flowing water supports that quality value. Chart scales stay fixed across saved scenarios for this node and variable.
Each arrow is a saved physical branch. Widths compare water flows within this node and day, with a minimum visible width for small flows; scales change with the selection. A dashed arrow is zero or unavailable flow. Orange arrows carry consumption or evaporation out of the river system. Click a neighbouring box to inspect it.
Inspect the accounting · balances, transfers and inventories
Daily balance diagnostics
| Diagnostic | Value | Unit |
|---|
Incoming branches
| Branch | From → to | Water m³/day | Flow m³/s | Salt kg/day | Salt mg/L | Departure °C | Arrival °C | Added heat MW | Sensible heat departure → arrival GJ/day |
|---|
Outgoing branches
| Branch | From → to | Water m³/day | Flow m³/s | Salt kg/day | Salt mg/L | Departure °C | Arrival °C | Added heat MW | Sensible heat departure → arrival GJ/day |
|---|
Displayed numbers are rounded; balance diagnostics come from the saved physical accounts rather than subtraction of displayed values. A zero water transfer is zero flow; its concentration and temperature can be undefined (—). Departure and arrival temperatures differ where heat is added on a link. Transfers to the atmosphere use a liquid-water-equivalent sensible-heat temperature, not air or vapour temperature; no salt is carried by evapotranspiration or evaporation.
Initial and end-of-day inventories
| Inventory / state | Initial | End of day | Change | Unit |
|---|
Industrial cooling — link process
This is the existing transfer from the mixed river to the downstream river, with heat added on that link. It creates no extra water diversion, salt load or storage node.
| Cooling link on selected day | Value | Unit |
|---|
E-flow checks · flow, salinity and annual findings
Reference: normal synthetic inflow, with the same 65%/35% branches, users removed and the reservoir replaced by through-flow. It stays fixed in dry scenarios, so shortfalls there reflect both reduced inflow and operating effects.
Flow through the year
Salinity through the year
Hover to inspect daily values; click a chart to select that day. Each chart keeps the same scale across scenarios for the selected water body. A gap in salinity means concentration is undefined in a dry reach.
These criteria stay fixed across operating scenarios. Daily means do not establish subdaily minima; one synthetic year does not establish long-term ecological adequacy. Ecological status remains unassessed without biological observations and a locally calibrated index. Meeting these physical criteria does not demonstrate fish passage, habitat connectivity or ecological recovery.
Inputs and operating context
Physical node-account provenance
Technical details and scenario comparison
Optional supporting material: input series, basin-wide findings, reservoir and thermal diagnostics, assumptions and provenance.
Inputs that drive the simulation
These are the saved synthetic input series. Scenario inflow and irrigation requests apply the selected scenario’s factors. Click any input chart to select the same day throughout the demonstration.
River inflow
Requested water supply
Source salt concentration
Concentration entering at the upstream river boundary.
Synthetic open-water evaporation depth
Prescribed mm/day as a seasonal weather proxy, not evaporation calculated from meteorological measurements. The model multiplies this depth by the changing reservoir surface area.
Temperature and industrial heat inputs
Upstream and equilibrium water temperatures
Requested industrial heat load
Thermal power the plant asks the river to receive; this is separate from its water-flow requirement.
| Input on selected day | Value | Unit |
|---|
Every water body has its own assessment
Today's physical conditions alongside full-year findings. The flow criterion stays fixed across scenarios. Temperature is a physical diagnostic without an ecological pass/fail criterion.
| Water body | Flow today m³/s | Required today m³/s | Salt today mg/L | Temperature today °C | Flow shortfall days/year | Salt exceedance days/year | Dry days/year |
|---|
Storage shifts water through time
Follow the reservoir through the selected scenario.
Read this alongside the river assessments
Storage can support users and river flows after the seasonal inflow peak. It can also reduce the water passing downstream earlier in the year. Its releases benefit the regulated branch and mixed river, but cannot restore the upstream bypass.
Every scenario starts with 40 million m³. The reservoir has an 80 million m³ capacity and an 8 million m³ operating reserve. The reserve limits managed releases; evaporation continues below it while water remains. Compare final storage as well as this year's deliveries: a policy that draws down more storage leaves less water for the following year.
A smaller reservoir exposes less water surface
The synthetic area–storage curve is piecewise linear. Surface area is evaluated after inflow and spill, before evaporation and managed release; it therefore differs from an area inferred from the plotted end-of-day storage. Potential evaporation is surface area × prescribed depth. Actual evaporation is capped only by the water available, while the operating reserve limits managed releases.
Surface area used that day
Potential and actual evaporation
| Reservoir evaporation on selected day | Value | Unit |
|---|
How storage and cooling change water temperature
An external energy-balance model follows TaqSim’s daily water transfers. Temperature is a modelled physical condition; no ecological temperature criterion is assigned.
Reservoir inlet, storage and outflow
One fully mixed reservoir compartment; no stratification or selective withdrawal. Outflow temperature is volume-weighted across spill and managed release. Spill occurs before surface heat exchange, so combined outflow can differ from the end-of-day stored-water temperature.
River before and after industrial cooling
A gap means no flowing water supports a temperature at that section. No ecological temperature criterion is used.
Accepted and unserved cooling heat
Explain the mechanism
Inflow mixes with stored water. Atmospheric exchange moves reservoir water toward a supplied effective equilibrium water temperature, which is not an air-temperature series. Exported water carries sensible heat. Surface exchange uses the same storage-dependent surface area as evaporation and includes latent effects once. Releases and return flows transport and mix sensible heat.
Cooling heat is curtailed in proportion to available river flow below the declared design flow. Unserved heat represents curtailed cooling service. This operating rule does not establish an ecological temperature threshold.
| Thermal condition on selected day | Value | Unit |
|---|
Thermal provenance and energy checks
Compare the operating choices
Precomputed scenarios, not an optimization. Compare delivery, local environmental findings and storage together. Click a scenario to load it.
| Scenario | Agriculture 1 demand supplied | Agriculture 2 demand supplied | Domestic demand supplied | Final / minimum storage million m³ | Cooling shortfall days/year | Flow shortfall water-body days | Salt exceedance water-body days |
|---|
A water-body day counts one water body on one day; summed values can exceed 365 and are a screening summary. See individual findings above. Initial storage is 40 million m³ in every scenario; using storage can improve this year's deliveries at a cost to the next year.
Assumptions and provenance
Suggested demonstration sequence
- Start with the system overview and click Inflow / source. Choose water flow, salt concentration, salt load and temperature to explain the synthetic boundary inputs.
- Follow the source into the upstream water body, reservoir and users. Move to the irrigation season and inspect the bypass after Agriculture 2.
- Switch to flow protection, then seasonal protection. Compare the same water body on the same day.
- Select the mixed water body before cooling. Explain how irrigation returns restore some flow while returning all diverted salt.
- Choose a dry scenario. Inspect all nine assessments, user deliveries and final storage together.
Physical assumptions and synthetic inputs
- This is a fictional one-year daily teaching example, with seasonal inflow and irrigation demand. It is not a calibrated Zarafshan model.
- A fixed bifurcation sends 65% of inflow toward the reservoir and 35% down the bypass. Agriculture 2 abstracts from the bypass; domestic supply and Agriculture 1 abstract below the reservoir.
- Reservoir evaporation equals the synthetic open-water evaporation depth times its storage-dependent surface area, capped by available water. It continues below the managed-release reserve and removes water while leaving salt in storage. Return flows mix with river water before cooling; concentration is calculated from total salt mass divided by total water volume.
- Cooling consumes no water in this example. Its separate thermal module uses the water run to calculate a curtailed heat discharge and downstream temperature. Wastewater reactions, reservoir stratification and biological responses remain outside this example.
What the assessment does—and what still needs evidence
- The reference removes users and replaces the reservoir with through-flow, preserving branch geometry. Dry scenarios reduce simulated inflow; the normal unregulated reference and assessment requirements remain fixed.
- Policy protection levels change operations; they do not redefine the assessment criterion.
- A dry reach has no defined salt concentration and is never counted as passing quality assessment.
- Daily means cannot establish subdaily minima. One year cannot support a robust multi-year hydrological-alteration assessment. No biological outcome or official compliance finding is asserted.