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Table 1 Input and output fuzzy sets

From: Early warning of impending flash flood based on AIoT

Prefix

Description

Input

Rainfall intensity (mm/d)

Small

Refers to the intensity of rainfall measured by the rain gauge sensor

Moderate

Heavy

Storm

Large storm

Water speed (m/s)

Slow

Refers to the speed of the floodwaters measured by the water flow sensor

Average

Fast

Water level (cm)

Low

Refers to the level of the floodwaters above ground level measured by the water flow sensor

Average

High

Steeper slopes/relief

Low

Refers to the slope of the land that affects waterflow speed

Average

High

Output

Warning system

Normal (N)

Cautious (C)

Dangerous (D)