15006 - Tay at Ballathie

Grid Reference:	37 (NO) 147 367
Operator:	SEPA
Catchment Area:	4587.1 km²
Level of Station:	26.2 mOD
Max. Altitude:	1214.0 mOD
Mean flow:	169.44 m³s^-1
95% exceedance (Q95):	43.082 m³s^-1
10% exceedance (Q10):	336.3 m³s^-1
61-90 Av. Ann. Rainfall:	1425 mm

Sample Hydrograph of Gauged Daily Flows

Flow Duration Curve for Gauged Daily Flows

Station Description

Velocity-area station with cableway; 90m wide. The most d/s station on the Tay, records highest mean flow in UK. All flows contained to date. C/m rated to above Qmed (approx. 4.7m). Some hydraulic analysis to est. highest floods. Since end of 1957, 1980 sq.km (43%) controlled for HEP (providing potentially increased flood storage from mid-1990s); some control prior to this. 73 sq.km controlled for water supply. Significant winter snow cover.

Catchment Description

Catchment is mostly steep, comprising mountains and moorland; exceptions are lower valleys. Bedrock mainly metamorphics and granite, but lower 20% (Isla Valley) is Old Red Sandstone. Approx. 60% is overlain by superficial deposits (mostly Boulder clay). Landuse mainly rough grazing and forestry. Several large lochs in catchment.

Factors Affecting Runoff

Reservoir(s) in catchment affect runoff.
Runoff reduced by public water supply abstraction.
Runoff reduced by industrial/agricultural abstraction.
Regulation for hydro-electric power.

River Flow and Catchment Rainfall on the National River Flow Archive

Gauged Daily Flows (gdf):	1952 to 2008
Naturalised Monthly Flows (nmf):	1967 to 1985
Monthly Catchment Rainfall (rnf):	1952 to 2008

Datatype	1950s										1960s										1970s										1980s										1990s										2000s

gdf
nmf
rnf

For many stations monthly peak flows are also archived. When daily flow data are not available monthly mean flows may be held on the National River Flow Archive. See Data Holdings for further information.

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