The stick is graduated in white, easy to read marks every one hundredth of an inch. Precipitation is measured in the measuring tube of the Standard Rain gauge with a black laminated measuring stick approximately 24" long. For the remainder of this document we will be referring the NWS 20 inch capacity gauge. The measuring tube of the small gauge holds 0.50 inch. The inner measuring tube of the large NWS gauge holds 2.0 inches of precipitation. Forest Service often use the smaller gauge. The 20 inch gauge is the norm throughout the National Weather Service. The traditional large gauge has a capacity of 20 inches whereas the smaller gauge's capacity is 7 inches. There are two basic type of the 8-inch gauge: a large capacity gauge and a small capacity gauge. This standardization provides uniformity, continuity, and credibility of precipitation data worldwide. The 8-inch gauge used in the National Weather Service is of a standardized design used throughout the world for official rainfall measurements. The 8-inch standard rain gauge is a simple non recording gauge consisting of four major components. If an 11 inch plastic rain gauge is used in lieu of a SRG, it too becomes the primary point of calculations.
It is the primary point from which all distances and elevation angles for the station, as required on the B-44, are determined. Also, azimuth and range calculations for co-located equipment and obstructions within 200 feet are based on the SRG location. Spacial coordinates (latitude, longitude), as well as elevation, are fixed from the Standard Rain gauge location. Even though the SRG is preferred, the 11 inch plastic gauge is an acceptable substitute in stations other than those in the "A" Network.Īt National Weather Service (NWS) Cooperative Weather Stations, the SRG is the center around which all documentation evolves. Every climatological station in the "A" Network must be equipped with a SRG. In its simplest form, an 8-inch Standard Rain gauge is an open mouth can with straight sides. It ends with a comparison of the SRG with other types of rain collectors. It describes the four major components of the gauge, the installation and exposure of the gauge, the use of wind shields, and measuring snowfall. The purpose of this page is to provide information on the 8-inch non-recording standard rain gauge (SRG). Snowfall and the SRG | SRG comparisons with other rain gauges Installation of the 8-Inch gauge | Wind shield
Introduction | Rain gauge description | Major gauge components
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