THE RIVER BURE AND ITS TRIBUTARIES. 2ig 
elapses between low water and high water than between 
high water and low water.”* 
A sufficiency of observations on the duration and speed 
of the currents in the Bure would require more attention 
than I have been able to give, but, so far as my notes go, 
they are in accordance with the principles given. 
At St. Benet’s Abbey, about 17 miles from Yarmouth, 
the flood current begins to run about an hour after low water. 
The ebb, on the other hand, was found, on the average, to 
begin 39 minutes after high water. The duration of flood 
and ebb was found to be 4 h. 50 m. and 7 h. 17 m. respectively, 
which is probably a fair approximation to the average. 
At Ludham Bridge, about a mile from Ant Mouth, obser- 
vations made in July, 1910, showed that the ebb began, on an 
average, 1 h. 50 m. after high water and the flood 2 h. 37 m. 
after low water. The duration of flood and ebb currents 
was, on an average, 5 h. 42 m. and 6 h. 51 m. It seems 
probable that these observations convey a somewhat false 
impression. The period at which they were taken was 4 — 7 
days after full moon with moderate South-westerly winds, 
and it was noticed that the interval between high water and 
the turn of the current became longer and that between low 
water and the flood shorter during the period. It is clear 
that some disturbing influence was at work, and, as will be 
shown below, the effect is precisely that which may be expected 
from Southerly winds. 
Lower down the river at Stokesby and Muckfleet, a few 
notes on the currents were made in September, 1910. Those 
at Stokesby, however, are very incomplete, and were taken 
at a time of exceptional tides. They show that, at that time, 
the ebb began one hour after high water and the flood 1 h. 
31 m. after low water. The duration of three ebbs averaged 
7 h. 28 m. 
At Muckfleet the ebb began 1 h. 27 m. after high water 
and the flood 3 h. 1 m. after low water, the duration of 
ebb and flood being 7 h. 55 m. and 4 h. 37 m. respectively. 
Whether these figures represent the normal state I cannot 
* G. H. Darwin, ‘The Tides/ London, 1901, p. 52. 
