What are the WMO recommendations for rain gauge network in a catchment?
What are the WMO recommendations for rain gauge network in a catchment?
WMO recommends certain densities of rain gauge stations to be followed for different types of catchments. For small mountainous regions with irregular precipitation, 25 km2 per station is recommended. According to the same WMO guidelines, the density falls to 10 – 20 km2 per station in urban areas [2].
What is the diameter of a rain gauge?
Instruments. The standard instrument for the measurement of rainfall is the 203mm (8 inch) rain gauge. This is essentially a circular funnel with a diameter of 203mm which collects the rain into a graduated and calibrated cylinder.
What are the different methods of rainfall recording?
Measuring rainfall can be is primarily done in three different ways using three different types of rain gauges. The three major types of rain gauges are the standard gauge, tipping bucket gauge and weighing gauge.
What is optimal number of station rain gauge station?
The optimum number should be at least 11, so that 7 ( = 11 – 4 ) additional rain- gauges within the catchment area are required.
What type of rain gauge is most accurate?
Stratus Precision rain gauge
One of the best rain gauges overall and our top recommendation for the most accurate results is the Stratus Precision rain gauge. If you’re looking for a digital rain gauge’s convenience and internet connectivity, we recommend the Ambient Weather WS-2902C weather station.
What is rain gauge density?
The rain gauges density or network density is define as the ratio of total area of the catchment to the total number of rain gauges in the catchment. To obtain reliable results , the various rain gauges should be evenly and uniformly distributed within a given catchment.
Who invented rain gauge?
In 1441, the Cheugugi was invented during the reign of Sejong the Great of the Joseon Dynasty of Korea as the first standardized rain gauge. In 1662, Christopher Wren created the first tipping-bucket rain gauge in Britain in collaboration with Robert Hooke.
What is a standard rain gauge?
The 20 inch gauge is the norm throughout the National Weather Service. However, other agencies like the U.S. Forest Service often use the smaller gauge. The inner measuring tube of the large NWS gauge holds 2.0 inches of precipitation. The measuring tube of the small gauge holds 0.50 inch.
What is recording rain gauge?
An instrument that automatically records the amount of precipitation collected as a function of time. The most common types, according to their principle of operation, are 1) tipping-bucket rain gauge, 2) weighing rain gauge, 3) capacitance rain gauge, and 4) optical rain gauge.
Which gauge gives the permanent record of rainfall?
Which gauge gives the permanent record of rainfall? Explanation: These are rain gauges which can give a permanent, automatic rainfall record in the form of a pen mounted on a clock driven chart. From the chart intensity or rate of rainfall in cm per hour. The recording is done by an attached siphon.
