39074 - Ampney Brook at Sheepen Bridge
| Grid Reference: | 41 (SU) 105 950 | 
|
| Operator: | EA |
| Local number: | 490 |
|
Catchment Area: | 74.4 km2 |
| Level of Station:
| 78.0 mOD |
| Max. Altitude: | 252.0 mOD |
| Mean
flow: | 0.76 m3s-1 |
| 95% exceedance (Q95): | 0.0 m
3s-1 |
| 10% exceedance (Q10):
| 1.94 m3s-1 |
| 61-90 Av. Ann.
Rainfall: | 777 mm |
Sample
Hydrograph of Gauged Daily Flows
Flow Duration Curve for Gauged Daily Flows
Station Description
Flat V weir (1:10 cross-slope, 4.5m broad). Often drowned. Calibration under
review - gaugings indicate that the drowned flow reduction factor (based on
tailwater levels) over-compensates for non-modularity. Limited head at low
flows, therefore insensitive. Some bypassing at highest flows. Small diminution
of flow due to abstraction, otherwise a naturally responding catchment.
Catchment Description
The Ampney Brook rises
in the pervious Great Oolite series but the lower catchment is principally
Oxford Clay. A rural catchment.Factors Affecting
Runoff
- Runoff reduced by public water supply abstraction.
River Flow and Catchment Rainfall on the
National River Flow Archive
| Gauged Daily
Flows (gdf): | 1980 to 2008 |
| Monthly Catchment Rainfall (rnf): | 1980
to 2008 |
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| Datatype | 1980s | 1990s | 2000s |
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gdf | | | | | | |
| rnf |
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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
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Data Holdings