Hydrograph
graph showing the rate of flow (discharge) versus time past a specific point in a river, channel, or conduit carrying flow
A hydrograph is a graph showing the rate of flow (discharge) versus time past a specific point in a river, channel, or conduit carrying flow. The rate of flow is typically expressed in units of cubic meters per second (m³/s) or cubic feet per second (cfs).
Hydrographs often relate changes of precipitation to changes in discharge over time. The term can also refer to a graph showing the volume of water reaching a particular outfall, or location in a sewerage network. Graphs are commonly used in the design of sewerage, more specifically, the design of surface water sewerage systems and combined sewers.
it is helpful for displaying both collected data and water level forecasts
Terminology
Other related terms include:
Approach Segment
the river flow before the storm (antecedent flow).
Rising limb
The rising limb of the hydrograph, also known as concentration curve, reflects a prolonged increase in discharge from a catchment area, typically in response to a rainfall event.
Peak discharge
the highest point on the hydrograph when the rate of discharge is greatest.
Recession (or falling) limb
The recession limb extends from the peak flow rate onward. The end of stormflow (a.k.a.
Begin with the source’s own compact description: “Hydrograph” is graph showing the rate of flow (discharge) versus time past a specific point in a river, channel, or conduit carrying flow. The dossier treats that line as a proposition to test through Hydrograph, graph and showing, not as a finished interpretation.
Why this record matters
The phrase “graph showing the rate of flow (discharge) versus time past a specific point in a river, channel, or conduit carrying flow” supplies a clear boundary for inquiry. It also exposes the unanswered questions: who defined that boundary, when it became stable and which sources sit outside it.
Place names and jurisdictional language are key evidence: both can reveal earlier catalogue descriptions and overlooked record series. The source revision retrieved here is dated Sep 2, 2026. The linked authority identifier is Q320062. None of the 0 selected statements returned an explicit reference.
A single description cannot reconcile every naming convention, rebuilding phase or administrative transfer associated with a place. The lead is largely declarative, so disagreement and counter-evidence require a deliberate search beyond the opening account. Authority statements aid reconciliation but still require their own references, qualifiers and ranks to be checked.
How to read it
Treat names, boundaries and functions as historically changeable. Maps, plans, inventories and administrative records can clarify what the place meant at different dates.
- Historic place names
- Jurisdictional context
- Routes into maps and plans
Contemporary maps, plans, listed-building records, estate papers and the responsible local or national archive.
Three-step research path
- Establish the record: confirm the title “Hydrograph”, its source revision and the description used here.
- Expand the search: follow Hydrograph primary sources, Hydrograph archive and Hydrograph research across catalogues and specialist indexes.
- Test the account: compare the strongest cited source with the responsible institution’s current record and note any disagreement.
Questions for further research
- Which source most directly establishes the central claim about “Hydrograph”?
- What physical evidence or contemporary plan supports the description?
- Which authority defined the place, boundary or structure at the relevant date?
Search terms from this dossier
This entry incorporates text from “Hydrograph” on English Wikipedia. Contributors are listed in the page history. Text is available under the Creative Commons Attribution-ShareAlike 4.0 License. Selected authority identifiers and statements are retrieved from Wikidata under CC0; their references and qualifiers remain part of the verification path.