THE RIVER BURE AND ITS TRIBUTARIES. 231 
High water occurred on an average 4 h. 9 m. after high 
water at Yarmouth Pier. 
The water level and the range of the tide are very distinctly 
affected by wind and rain. Taking the mean range as 3 in., 
the lowest ranges of the period occurred between September 
2nd and 6th, corresponding to the day before and three 
days after the first quarter of the moon — in other words to neap 
tides. But during this time there was heavy rain and the 
wind was rather strong from the West, North-west, and 
North-east, and the water level was remarkably high. The 
water level then fell steadily, till at full moon on September 
10th the level was lower than on any other day in the year. 
The range, on the other hand, was almost steadily above the 
mean, and quite exceptionally large on the day of lowest 
water level. Strong Southerly winds prevailed at this time, 
with no rain. The steady fall of water was broken by a rise 
of September 7th, with a West wind, and the range was then 
correspondingly lower. These facts, taken in conjunction 
with others to be given later, show that Northerly winds tend 
to raise the water level and to decrease range, while Southerly 
winds have the reverse effect. Also that the higher the level 
of the water, that is to say the more water there is in the 
river, the less is the range of the tide. The general water 
level is not dependent on the tide, as it may be at its highest 
at neaps and its lowest at springs. 
On September 17th, at the last quarter of the moon, a strong 
S.W. wind blew. There was then so sharp a fall of water 
level that, in the morning of that day, there was absolutely 
no tide. The water fell from 5.30 p.m. on September 16th 
till 12.15 p.m. on September 17th. At Yarmouth the cor- 
responding tide was nearly 2 feet less than the preceding 
and following tide. 
South Walsham Broad. 
On August 28th, 1906, two tide gauges were set up, the 
one in South Walsham Broad and the other in the river, just 
above the entrance to the South Walsham Cut, and records 
were taken till August 30th. 
