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I recently compiled a chart to get a rough idea of clearances at Potter Heigham Bridge.
Using B.A tide information I look for dates that high or low water occurs near 00:30 Hours at Gorleston (Yarmouth Bar) adding on four hours for high and low water at Potter Heigham makes the time 04:30 Hours which is the time that the Environment Agency tend to record the river level at Repps.
I then use Strowager’s formula to work out the Bridge clearance.
This is what I have done so far.
16 February 2015 – 9 mins before Low Water 7ft 1in (0.18 at Reps) 24 February 2015 – High Water 6ft 1in (0.48 at Reps) 01 March 2015 – 29 mins before Low Water 6ft 8in (0.30 at Reps) 12 March 2015 – 6 mins before High Water 6ft 9in (0.28 at Reps) 18 March 2015 – 25 mins after Low Water 7ft 2in (0.14 at Reps)
I hope I’ve done it right.
Wouldn’t it be good if there was a permanent webcam to The Pilot’s gauge?
just to let you know we actually managed to get through the bridge on OCT 8th we were on Southern Horizon height 6ft6 the pilot got ud through even though the clearance was just showing slightly over that height we were almost alone very few boats therefor 4 nights cane back through 12th low water was at 430 but we got through no problem at 1240 it was a neep tide and the young pilot was taking boats through ar 6ft7 or less