205008 - Lagan at Drumiller
| Grid Reference: | 33 (IJ) 236 525 |  |
| Operator: | RA |
|
Catchment Area: | 84.6 km2 |
| Level of Station:
| 81.0 mOD |
| Max. Altitude: | 532.0 mOD |
| Mean
flow: | 1.52 m3s-1 |
| 95% exceedance (Q95): | 0.078 m
3s-1 |
| 10% exceedance
(Q10): | 3.504 m3s-1 |
|
61-90 Av. Ann. Rainfall: | 1015 mm |
Sample Hydrograph of Gauged Daily Flows
Flow Duration Curve for Gauged
Daily Flows
Station Description
Velocity-area station with calibration by
wading. Flat V weir installed in 1991. Gauged to approx. 1.2 QMED. Minor
floodplain flow (left bank) during floods. High flow gauging from bridge on d/s
side, as u/s flows less uniform. Simple extrapolation used above max gauging of
30.77m3/s. Flows not contained. Prior to weir installation rating based solely
on gaugings. Flows from 1978 onwards reprocessed in 2002. Natural regime - no
water abstractions or significant effluent returns.
Catchment Description
Geology: entirely Silurian overlain with
limited till. Catchment rises to over 500m. Predominantly improved grassland
and upland heath. Catchment contains one large village (Dromora, pop. 597, 2001
census).Factors Affecting Runoff
- Natural to within 10% at the 95 percentile flow.
River Flow and Catchment Rainfall on the National River Flow
Archive
| Gauged Daily Flows (gdf): | 1974 to
2008 |
| Monthly Catchment Rainfall (rnf): | 1961 to 2008 |
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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.
NRFA Home Page
Station Summaries
Regional Maps
Data Holdings