WRRCTR No. 67 Rainfall Intensity Instruments and Measurements

Date
1973-07
Authors
Fullerton, Charles M.
Raymond, David J.
Contributor
Advisor
Department
Instructor
Depositor
Speaker
Researcher
Consultant
Interviewer
Annotator
Journal Title
Journal ISSN
Volume Title
Publisher
Water Resources Research Center, University of Hawaii at Manoa
Volume
Number/Issue
Starting Page
Ending Page
Alternative Title
Abstract
Two instruments have been used to measure the rate of rainfall from tropical clouds over the windward coast of the Island of Hawaii. The Workman intensity gauge employs strain gauges to sense the deflection in a movable trough and hence the flow of water down the trough. The Raymond-Wilson gauge, a new instrument developed during this program, measures the electrical resistance of flowing water to determine the rainfall rate. These instruments were deployed in a small scale array of eight gauges to measure space and time variations in high intensity rainfall as showers move across the network. Comparative measurements were made with a standard weighing rain gauge, a tipping bucket rain gauge and the Jardi rate of rainfall gauge. Both the Workman gauge and the Raymond-Wilson gauge are clearly superior to the other instruments, because of their rapid response time and their capacity to measure high intensity showers continuously and automatically. The Raymond-Wilson gauge contains no moving parts and is operationally more suitable than the Workman gauge for deployment in a network of gauges. A sensor which measures the rate of change of atmospheric pressure has also been developed and is being used in the research program. An example of rainfall intensity measured during a 43-day period in October and November, 1972, is presented, along with a preliminary estimate of the in-cloud liquid water content of shallow Hawaiian clouds.
Description
Keywords
Rainfall frequencies -- Hawaii., Rain gauges., Rain and rainfall -- Hawaii.
Citation
Fullerton CM, Raymond DJ. 1973. Rainfall intensity instruments and measurements. Honolulu (HI): Water Resources Research Center, University of Hawaii at Manoa. WRRC technical report, 67.
Extent
vi + 32 pages
Format
Geographic Location
Time Period
Related To
Table of Contents
Rights
Rights Holder
Local Contexts
Email libraryada-l@lists.hawaii.edu if you need this content in ADA-compliant format.