The monitoring network within this area

Hydrionis holds 445 values from 2 gauges within it. Discharge is a property of a gauge and its reach, not of this drainage area, so this page reports the network and its records rather than a single figure.

Gauges

445

Values held

1898–2026

Record spans

Gauges within the Broad huc8 subbasin

2 monitoring points, positioned as the publisher records them.

Flood peaks, as measured

This gauge's flood record, as measured. Unlike a daily mean it is the discharge at the moment the river was highest, which is the figure flood frequency analysis is built on.

Largest measured flow of each year at BROAD RIVER ABOVE CARLTON, GA

The highest instantaneous discharge the publisher recorded in each year — a flood peak as measured, not a daily average of one. 1898–2025.

Show relevant events (1 event)Shading marks when something was recorded, not what caused the line.

Published by the gauge's own operator from its sub-daily record; Hydrionis stores the figure rather than recomputing it. A year the gauge did not cover produces no value rather than a low one, and the gaps are stated below the chart. A peak is a property of this gauge and its reach: a larger flood upstream or downstream of it is not in this series.

What the shaded periods are (1 event)

A shaded period marks when something was recorded, not what caused the shape of the line. Where the two coincide, they coincided.

Documented record — A documented event, compiled from cited sources after it happened. The dates are as good as the record, which for older events can mean the month rather than the day.

Event	Type	Period	Standing	Authority
Hurricane Katrina water and sanitation collapse	Flood	2005-08-29 – 2005-09-30	Documented record	Compiled record

Not shown on this chart

The 1976 drought — This event’s area does not contain this chart’s subject. Sharing a country is not sharing an event, so it is not drawn.
The 2022 drought — This event’s area does not contain this chart’s subject. Sharing a country is not sharing an event, so it is not drawn.
Yorkshire drought — This event’s area does not contain this chart’s subject. Sharing a country is not sharing an event, so it is not drawn.
Cantareira water crisis, São Paulo — This event’s area does not contain this chart’s subject. Sharing a country is not sharing an event, so it is not drawn.
Cape Town Day Zero — This event’s area does not contain this chart’s subject. Sharing a country is not sharing an event, so it is not drawn.
European drought — This event’s area does not contain this chart’s subject. Sharing a country is not sharing an event, so it is not drawn.

View the data behind this chart

Underlying data
Period	BROAD RIVER ABOVE CARLTON, GA (m³/s)
1898	753
1899	552
1900	895
1901	504
1902	1,223
1903	841
1904	294
1905	233
1906	705
1907	176
1908	1,982
1909	402
1910	580
1911	160
1912	1,212
1913	858
1914	566
1915	677
1917	430
1918	153
1919	835
1921	569
1922	311
1923	354
1925	286
1926	203
1927	75.9
1928	694
1929	648
1930	108
1931	323
1932	249
1934	235
1936	821
1937	453
1939	595
1940	481
1941	283
1942	379
1943	538
1944	283
1945	314
1946	459
1947	351
1948	221
1950	96.3
1952	433
1953	249
1954	259
1955	280
1956	249
1957	235
1959	210
1960	238
1961	694
1963	501
1964	648
1965	300
1966	442
1967	538
1968	216
1969	453
1970	194
1971	510
1972	442
1973	453
1974	164
1975	442
1976	736
1977	331
1979	558
1980	357
1981	195
1982	552
1983	232
1985	283
1987	371
1988	175
1989	204
1991	283
1992	340
1994	368
1995	265
1996	564
1997	374
1998	719
1999	351
2000	177
2001	153
2002	126
2003	547
2004	365
2005	348
2007	272
2008	100.0
2009	257
2010	445
2011	150
2012	99.7
2013	289
2014	445
2015	135
2017	151
2018	191
2019	801
2020	708
2021	294
2023	504
2024	617
2025	396

About this series

Everything below is a property of the data rather than a rating of it. There is deliberately no single confidence score: how much a gap matters depends on what you are about to do with the series, and only you know that.

Source	United States Geological Survey — National Water Information System · US Government work — public domain
How the values came to exist	Measured
Period held	1898–2025
Completeness	85.9% of the periods in that span are held. Gaps are drawn as breaks and never interpolated.
Known gaps	18 separate periods inside 1898–2025 hold no value. They are drawn as breaks in the line and are never interpolated across.
Continuity	The record begins in 1898 and is not continuous from it: 128 years separate the first value from the last, and 86% of the years between them are held. The span is not the record.
Last read from the publisher	2026-10-01
Redistribution	Permitted by the upstream licences
Commercial reuse	Permitted by the upstream licences. No Hydrionis access tier can widen this.
Methodology	How this was produced

How much of the rain came back out

A discharge in cubic metres per second cannot be compared with anything: the larger number may only mean the larger catchment. Divided by the area draining to the gauge it becomes a depth of water over that land, which answers a question a reader already has — of the rain that fell here, how much came back out as river?

Water leaving the catchment above BROAD RIVER NEAR BELL, GA, as a depth

The year's flow spread over the land draining to this gauge, in millimetres — the same unit rainfall is measured in. 1927–2025.

Show relevant events (1 event)Shading marks when something was recorded, not what caused the line.

Computed by Hydrionis from the published annual mean flow and the catchment area the station's own publisher states. It is not a water balance: the difference between rainfall and runoff is not evaporation alone but also change in groundwater storage, water abstracted and taken elsewhere, and water imported by transfer schemes — which is why a catchment can yield more runoff than the rain that fell on it without anything being measured wrongly. A different area figure rescales every value here by the ratio between them.

What the shaded periods are (1 event)

A shaded period marks when something was recorded, not what caused the shape of the line. Where the two coincide, they coincided.

Documented record — A documented event, compiled from cited sources after it happened. The dates are as good as the record, which for older events can mean the month rather than the day.

Event	Type	Period	Standing	Authority
Hurricane Katrina water and sanitation collapse	Flood	2005-08-29 – 2005-09-30	Documented record	Compiled record

Not shown on this chart

The 1976 drought — This event’s area does not contain this chart’s subject. Sharing a country is not sharing an event, so it is not drawn.
The 2022 drought — This event’s area does not contain this chart’s subject. Sharing a country is not sharing an event, so it is not drawn.
Yorkshire drought — This event’s area does not contain this chart’s subject. Sharing a country is not sharing an event, so it is not drawn.
Cantareira water crisis, São Paulo — This event’s area does not contain this chart’s subject. Sharing a country is not sharing an event, so it is not drawn.
Cape Town Day Zero — This event’s area does not contain this chart’s subject. Sharing a country is not sharing an event, so it is not drawn.
European drought — This event’s area does not contain this chart’s subject. Sharing a country is not sharing an event, so it is not drawn.

View the data behind this chart

Underlying data
Period	BROAD RIVER NEAR BELL, GA (mm)
1927	304
1928	509
1929	830
1930	332
1931	341
1938	354
1939	377
1940	328
1941	272
1942	377
1943	456
1944	435
1945	410
1946	483
1947	464
1948	653
1949	586
1950	327
1951	295
1952	406
1953	390
1954	233
1955	201
1956	280
1957	343
1958	367
1959	349
1960	440
1961	528
1962	443
1963	557
1964	851
1965	418
1966	463
1967	485
1968	410
1969	480
1970	279
1971	498
1972	538
1973	617
1974	450
1975	622
1976	544
1977	481
1978	362
1979	533
1980	539
1981	214
1982	447
1983	553
1984	536
1985	293
1986	200
1987	337
1988	167
1989	410
1990	492
1991	450
1992	512
1993	526
1994	517
1995	508
1996	491
1997	467
1998	633
1999	248
2000	192
2001	213
2002	260
2003	530
2004	355
2005	506
2006	250
2007	197
2008	168
2009	495
2010	384
2011	216
2012	121
2013	487
2014	318
2015	486
2016	292
2017	226
2018	465
2019	446
2020	591
2021	418
2022	361
2023	393
2024	419
2025	306

About this series

Source	United States Geological Survey — National Water Information System · US Government work — public domain
How the values came to exist	Derived Computed by Hydrionis
Period held	1927–2025
Completeness	93.9% of the periods in that span are held. Gaps are drawn as breaks and never interpolated.
Known gaps	One period inside 1927–2025 holds no value: 1932 to 1937, 6 years with no reading. It is drawn as a break in the line and is never interpolated across.
Continuity	The record begins in 1927 and is not continuous from it: 99 years separate the first value from the last, and 94% of the years between them are held. The span is not the record.
Inputs last read	2026-10-01 · when the records this was computed from were last read from their publishers
Calculation date	2026-08-24 · when the calculation method was last versioned, not a reading of any publisher
Redistribution	Permitted by the upstream licences
Commercial reuse	Permitted by the upstream licences. No Hydrionis access tier can widen this.
Methodology	How this was produced

Every gauge Hydrionis holds within this area

Gauges within the Broad and what each holds
Gauge	Measures	Values	Record
BROAD RIVER NEAR BELL, GA	burned area within 50 km, catchment area, annual maximum river flow, mean river flow, mean river flow, water year	317	1908–2026
BROAD RIVER ABOVE CARLTON, GA	catchment area, annual maximum river flow	128	1898–2026

How these gauges were attached to this water

Assigned by the publisher to a numbered basin Every gauge here is assigned to this drainage area by its own publisher, which issues the area an official code — 03060104. A drainage area is not a river: it contains the tributaries as well as the main channel, and a gauge in it may be on any of them.

What each gauge’s link to this water rests on
Gauge	Evidence	Established
BROAD RIVER NEAR BELL, GA	Stated by the publisher — USGS site service, huc_cd field — https://waterservices.usgs.gov/nwis/site/ ; named from the USGS Watershed Boundary Dataset 8-digit HU (Subbasin) layer — https://hydro.nationalmap.gov/arcgis/rest/services/wbd/MapServer/4	2026-10-02
BROAD RIVER ABOVE CARLTON, GA	Stated by the publisher — USGS site service, huc_cd field — https://waterservices.usgs.gov/nwis/site/ ; named from the USGS Watershed Boundary Dataset 8-digit HU (Subbasin) layer — https://hydro.nationalmap.gov/arcgis/rest/services/wbd/MapServer/4	2026-10-02

What this record holds

Hydrionis decides which waters get a page, and which of those are offered to search, from what is actually held rather than from how the page reads. Five signals are counted; this record has 3 of them, which makes it a full profile.

Information-gain signals held for this water body
Signal	Held	Counts
Gauges holding a real record	2	no
Years spanned	129	yes, 20 or more
Values held	445	no
Distinct measurements	5	yes, 2 or more
Publishers measuring it	2	yes, 2 or more
Official identifiers	1	recorded, not counted

Use this data

Machine-readable JSON /api/v1/observations/by-subject/gauge-usgs-02192000.json
How to cite this, and who you must credit
How these figures were produced
Request this at a different scale, format or geography

No bulk download is offered here, which is a licence position rather than a product one: at least one contributing publisher does not permit redistribution. The values can be read on the page, cited, and pointed to at source.

Attribution and citation

Suggested citation for Hydrionis

Hydrionis (2026), Broad gauge records, accessed 2026-10-05, hydrionis.com/waters/united-states-broad/

Cite Hydrionis where you rely on values Hydrionis computed, on the method that produced them, or on the compilation itself. The underlying measurements remain the publishers’ and their attribution requirements apply to you directly.

Recommended, not required. Hydrionis does not claim rights over unmodified public data it relayed, and doing arithmetic on somebody else’s measurements does not make them Hydrionis’s. Cite the version and the access date: the Broad gauge records changes as publishers release and as methods are revised, and a citation without both cannot be checked later. Full guidance is on cite and reuse.

None of the contributing licences requires attribution. Crediting the publishers is still good practice and they are listed above.

Where these figures come from

MeasuredHigh confidence2025-08-07

Source: USGS — National Water Information System, USGS site 02192000, annual peak streamflow. Licence: Open.

Method: The instantaneous maximum discharge of each water year as published by USGS, dated to the day it occurred. One value per October-to-September water year; where the publisher lists both a systematic and a historic peak for a year, the larger is the annual maximum. Values the publisher marks as maximum daily averages are not held here, because they are not instantaneous peaks. Values marked as bounded rather than measured are held as censored observations carrying the bound. Cubic feet per second are converted to cubic metres per second and the publisher unit is recorded alongside.

Rating curves are extrapolated at extreme discharges, so the largest values in a peak series carry the largest measurement uncertainty. Data from the U.S. Geological Survey National Water Information System, a work of the United States government and therefore in the public domain.

Retrieved 1 October 2026.