203022 - Blackwater at Derrymeen Bridge
| Grid Reference: | 23 (IH) 625 530 |  |
| Operator: | RA |
| Local
number: | 203022 |
| Catchment Area: |
182.9 km2 |
| Level of Station: | 50.1 mOD |
| Mean flow: | 4.80 m3s-1
|
| 95% exceedance (Q95): |
0.695 m3s-1 |
| 10% exceedance
(Q10): | 10.73 m3s-1 |
|
61-90 Av. Ann. Rainfall: | 1142 mm |
Sample Hydrograph of Gauged Daily Flows
Flow Duration Curve for Gauged
Daily Flows
Station Description
Velocity-area station. Originally opened 1970,
but closed after a few months due to the political climate in Northern Ireland.
Re-opened early 1980s. Fisheries boulders may cause blockage and affect
low-flow rating. Rating derived from current meter gaugings. Simple
extrapolation occurs above 50m3/s. Last high flow gauging carried out in 1986.
Major arterial drainage scheme completed 1985-89; substantial impact on channel
and calibration.Catchment Description
Predominantly Carboniferous Limestone with some Lower Old Red Sandstone.
Extensive rock near surface, some sands and gravels along river reaches, and
peat in upland areas. Catchment contains town of Coalisland (pop 4,872, 2001
census). Currently brickmaking and agricultural land use, formerly mining area.
River Flow and Catchment Rainfall on the National
River Flow Archive
| Gauged Daily Flows (gdf):
| 1998 to 2008 |
| Monthly Catchment Rainfall (rnf): | 1998 to 2008
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| Datatype |
1990s | 2000s |
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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