15003 - Tay at Caputh

Grid Reference:	37 (NO) 082 395
Operator:	SEPA
Catchment Area:	3210.0 km²
Level of Station:	35.6 mOD
Max. Altitude:	1214.0 mOD
Mean flow:	140.27 m³s^-1
95% exceedance (Q95):	35.78 m³s^-1
10% exceedance (Q10):	276.8 m³s^-1
61-90 Av. Ann. Rainfall:	1610 mm

Sample Hydrograph of Gauged Daily Flows

Flow Duration Curve for Gauged Daily Flows

Station Description

Velocity-area station with cableway; 95m wide. 62% of catchment controlled for HEP; developed from 1930s to 1957. Substantial surface storage. Net water import. Twice daily stage readings from 7/37, continuous from 10/51. Monthly naturalised data available 1973-87. Estimated flood flow for 17/2/50 (1503 cumecs) is to be revised. Recalibration underway, signif. changes to peak flows expected.

Catchment Description

Most of catchment is steep, rising up to >1200m. Bedrock mostly metamorphics and granites with approx. ~60% overlain by superficial deposits. Landuse mountains and moorland, rough grazing and forestry. Numerous lochs; the largest are Ericht, Rannoch, Tummel and Tay.

Factors Affecting Runoff

Reservoir(s) in catchment affect runoff.
Regulation for hydro-electric power.

River Flow and Catchment Rainfall on the National River Flow Archive

Gauged Daily Flows (gdf):	1947 to 2008
Naturalised Monthly Flows (nmf):	1973 to 1985
Monthly Catchment Rainfall (rnf):	1948 to 2008

Datatype	1940s										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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