Figure 5 - uploaded by Tristan Hatton-Ellis
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Pant-y-Llyn hydrograph and temperature (red line represents base of estavelle at 157.47mAOD). Temperature fluctuations become very large when the water level falls below the height of the sensor.

Pant-y-Llyn hydrograph and temperature (red line represents base of estavelle at 157.47mAOD). Temperature fluctuations become very large when the water level falls below the height of the sensor.

Source publication
Technical Report
Full-text available
Pant-y Llyn is Wales’ and Britain’s only recorded Turlough. It is a key feature of Cernydd Carmel SSSI and SAC and a groundwater dependent terrestrial ecosystem (GWDTE) that has been identified as being at risk of significant damage from enriched groundwater input. This investigation is a collaborative project between hydrogeologists from Environme...

Contexts in source publication

Context 1
... 2010 was especially dry with limited precipitation between November 2010-January 2011 ( Figure 5). It was also very cold (a record of -18 o C in Powys on 28 th November 2010) in the latter part of November with any potential recharge being frozen on the ground. ...
Context 2
... there was no data available for the turlough response at low water levels (<159 mAOD), durations below this threshold are uncertain. However, given the field observations reporting the turlough retaining water throughout most of the year, it is likely that the duration curves drop off more gently below 159 mAOD than those shown in Figure 15. ...