Hidden depths of Chasewater reservoir - in pictures

Captured by photographer Brian Morgan over the past five years, the pictures show the gradual rise of the water levels and uncover the previously unseen barren floor of the pool.

The 75-year-old ventured to the country park every few weeks as he set about recording the transition. "I have been coming to Chasewater County Park for years," said Mr Morgan.

"When they drained it I thought I would come over and have a look as none of us had seen it empty before and it is likely to be a one-off. I found it fascinating and decided to start taking regular pictures.

"You could see the gradual change from initially a black mud covering the floor but over time came a sandy effect and then slowly the levels started to rise. There was no indication where the water came from. When it was empty it was quite striking seeing people walk across it. One morning I even saw a grand stag go across."

The reservoir near Brownhills reached its full capacity of nearly five billion litres in April after being drained in 2010 for repair work.

A brick-built chamber that does not appear on any plans was discovered after draining. A boat that sank in 1959 was also seen for the first time.