204001 - Bush at Seneirl Bridge

Grid Reference:	24 (IC) 942 362
Operator:	RA
Catchment Area:	299.2 km²
Level of Station:	25.0 mOD
Max. Altitude:	540.0 mOD
Mean flow:	6.67 m³s^-1
95% exceedance (Q95):	1.071 m ³s^-1
10% exceedance (Q10):	14.7 m³s^-1
61-90 Av. Ann. Rainfall:	1116 mm

Sample Hydrograph of Gauged Daily Flows

Flow Duration Curve for Gauged Daily Flows

Station Description

Velocity-area station with cableway and natural control; some weedgrowth problems in the measuring reach. Well gauged to QMED; some out-of-bank flow above. Full period of record reprocessed in 2002 (but existing data retained for 1974 and Oct/Nov 1973). The rating is derived from current meter gaugings. Simple extrapolation occurs above approx 63m3/s (highest gauged level). Re-calibrated at high end recently. Altnahinch Reservoir at the head of the river has a minor impact.

Catchment Description

Geology predominantly basalts with a major fault bisecting the catchment. Some schists in upper reaches with a little greensand. Extensive Drift cover, peat on high ground. Predominantly grassland with some horticulture (mainly potatoes), coniferous woodland and shrub heath. No significant urban centres apart from Ballymoney (pop. 9,009, 2001 census).

Factors Affecting Runoff

Reservoir(s) in catchment affect runoff.
Runoff reduced by public water supply abstraction.
Runoff influenced by groundwater abstraction/recharge.

River Flow and Catchment Rainfall on the National River Flow Archive

Gauged Daily Flows (gdf):	1972 to 2008
Monthly Catchment Rainfall (rnf):	1972 to 2008

Datatype	1970s										1980s										1990s										2000s

gdf
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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