How much rainfall/discharge can cause flooding for a given area?
I read a paper today regarding trends in drought using SPI values. That got me thinking if there is or can be an index for flooding as well. The issue is that drought is usually a long term meteorological phenomenon while flooding occurs in and for a much shorter time period than drought. So I am now thinking along the lines of the concept of rainy days where any day with a daily rainfall more than 2.5 mm is considered a rainy day. Can a similar concept be applied for flooding as well with maybe rainfall and AMC being the decisive factors? Are there any already established criteria this?
As pointed out by the answers above it is challenging to have a flood index based purely on rainfall. This is because flooding is dependent on a number of other factors including the antecedent moisture conditions (AMC) and the catchment characteristics (e.g. area, slope, land use, soil type etc).
which discusses the use of the Standard Precipitation Index (SPI) to monitor flooding in Argentina which maty be of use. This paper here: https://core.ac.uk/download/pdf/61008968.pdf looks at using the SPI to highlight wetter than normal conditions in Portugal which may lead to flooding.
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High rainfall variation creates problems of floods and droughts in any region of the world. This study focuses on spatial rainfall variability and drought assessment in Khyber Pakhtunkhwa province of Pakistan using Standardized Precipitation Index (SPI). Various indices like standard deviation, skewness, and kurtosis were calculated from annual rai...
Based on monthly rainfall data from 160 meteorological stations in Northwest China in summer from 1950 through 2000, flood and drought features in five subrogions are studied. Occurrences of drought and flood in Region 1 and Region 2 during summer had higher frequencies as compared with other three regions. Frequencies of summer flood were higher t...
Natural disasters are a major concern in Bangladesh, particularly drought which is one of the most common disaster in Bangladesh. Drought needs to be explained spatially to understand its spatiotemporal variations in different areas. In this paper, the meteorological drought has been shown by using the Standardized Precipitation Index (SPI) method...