There should not be much variation in the rainfall values of the stations under consideration. Theissen Polygon Method: This method is very accurate. In particular for areas with well defined dry and wet seasons, users should see a well-defined linkage between the rainfall and the vegetation seasonal cycle. Rainfall variability engenders changes in the frequency and severity of water-related disasters. Rainfall Anomaly Index (RAI) Index name: Rainfall Anomaly Index (RAI). Assessing the impact of areal precipitation input on streamflow simulations using the SWAT model. Managing Climate Risk in the U.S. Financial System September 17, 2020; Florida Climate Outlook: Assessing Physical and Economic Impacts through 2040 February 12, 2020; Black into green: A BIG opportunity for North Dakota’s oil and gas producers April 10, 2019; Top 4 Pop Research from 2018 December 13, 2018; Using Cattle To Reverse/Offset Global Warming August 17, 2018 Given the time window w within a storm, the maximum rainfall intensity over w, namely i w decreases as w increases. Rainfall variability has historically been a major cause of food insecurity and famines in Ethiopia Pankhurst (1966; Wood,1977; Degefu, 1987). The earlier formula, however, requires only the 10‐yr 1‐hr rainfall depth instead of the writer's three rainfall depths (i.e., 10‐yr 1‐hr, 10‐yr 24‐hr, and 100‐yr 1‐hr). It is also necessary to know the extent to which the items vary from the mean. Be able to source rainfall data, understand the nature of that data and describe it using simple statistics in Excel. Let's be honest - sometimes the best rainfall calculator is the one that is easy to use and doesn't require us to even know what the rainfall formula is in the first place! A decreasing trend of rainfall has been observed in West Africa, where rainfall erosivity is also considered to be high. Adv. landslides, flooding and dry conditions are common. Measures (Descriptors) of Variability: The mean indicates general order of magnitude of a set of data. This research aimed at providing a platform for insights on variability of historical rainfall and flow in the River Nile basin. Related Readings. The same problem is evident as with the high and low extremes used as a way of characterizing the temporal variability of rainfall. Notice the difference in the monthly values, while the annual rainfall, on which the data are ranked are around 860 mm, give or take a few millimetres. Climate change vulnerability and risk - key concepts - Coordinatedby Project financedwith the contributionof LIFE Programme2014-2020 Francesca Giordano Istituto Superiore per la Protezione e la Ricerca Ambientale. An interception model that links the temporal variability of rainfall with the storm-based description of the interception process is derived. CV is defined as the Standard deviation divided by the mean value of rainfall. The climate is a forced, dissipative, nonlinear, complex, and heterogeneous system that is out of thermodynamic equilibrium. Unlike eigenvector techniques, the patterns produced by the Lund method are not orthogonal; hence, these six anomaly types really describe only four basic configurations of anomalies. Then the average deviation would still be 5.16" per year. Most of the rainfall variability over the continent is described by the six "anomaly types" illustrated in Figure 2. 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