Sunday, 26 August 2012
Keighley Corporation Waterworks
Ages ago one of my weather collectors, Mike, gave me (on loan) some old annual reports from Keighley Corporation Waterworks that he'd been given. They date from 1917. There are a few into the 1920's, a couple from 1930's and one from 1956. They are simple, beautiful pamphlets giving information on the reservoirs around Haworth.
There are tables of rainfall and also the mention of wettest months or length of time without rain.
The 1917 report describes conditions in 1916:
"The longest period of continuous rainfall occurred between 12-0 noon on March 15th to 4-0 am on March 17th, a period of 40 hours, during which the total rainfall amounted to 1.27 inches.
On November 18th, 1916, there was a short sharp shower of rain at 8.25 pm amounting to .07 of an inch, but this fell almost at once as no appreciable interval of time can be seen on the Hyetograph diagram. The rate might therefore be considered to be anything between 4 1/2 inches per hour and 18 or 20 inches per hour. Such sudden rainfall requires to be specially observed to get an accurate measurement of the exact interval of fall, but unfortunately in these special cases, even if the sudden deluge occurs during the daytime, the shower is over before its intensity is realized."
Between 4 1/2 inches and 20 inches per hour?! No wonder the reservoirs have been built in the area.
I know the dates don't match up to my Bronte time dates - but it's fascinating reading and i've enjoyed perusing the information.