45 
Some Dotes on Local Rainfall. 
By G. T. Lynam, A.M.1.C.E. 
READ BEFORE THE Society, APRIL 17TH, 1902. 
HE Society is in possession of details of the rainfall in Burton 
for a number of years, and very interesting analyses of the 
records have been published from time to time in the Trans- 
actions. Heavy rainfalls, however, do not appear to have been 
particularly dealt with in detail, and some notes on the rapidity and 
duration of fall may be of interest and use. The records that have 
been published are of interest more from a scientific point of view 
than a popular or even practical one. I propose to deal chiefly with 
the practical aspect of the subject. As one who has from time to 
time to devise and carry out means of disposing of rainwater when it 
falls, I require to know the maximum quantity that may be expected 
in a given time; and, in order to ascertain this maximum, in the 
absence of any information at my disposal, I have established an 
automatic recording instrument, and have taken continuous obser- 
vations for a period of three years. As these results can be stated 
in a very few words, I propose, in addition, to give the general results 
of my observations of the effect of rainfall upon the level and volume 
of the river Trent. 
RATE AND DURATION OF RAIN. 
The instrument used for recording the rate and duration of 
rainfall is established at the Corporation Store Yard at Bond End. 
These premises are 152 feet above Ordnance Datum, and the 
mouth of the rain gauge is 2 feet above the ground. The instru- 
ment is one of Mr. George Kent’s automatic rainfall recorders. It 
is designed to give an accurate general idea of the time, rate, and 
duration of rainfall. The instrument consists of a receiving cylinder, 
surmounted by a circular gauge, 7 ins, diameter, in which rain falls, 
, 
a 
