his study aimed to develop temporal rainfall distribution patterns of 1-day, 3-, 5-, and 7-consecutive
rain days for three meteorological stations in Tra Vinh province (Cang Long, Tieu Can, and Tra Cu), using daily
rainfall data from 1978 to 2017. The study follows the Vietnamese National Standards (TCVN 10406:2015:
Irrigation Works – Calculation of Design Drainage Coefficients) to determine the frequency of events of various
rainfall distribution drainage patterns. Thereafter, the probability method was conducted to identify rainfall pattern
design according to a 10-year return period. Only Cang Long meteorological station exhibited enough single events
of rainfall patterns (>10) for 3 consecutive days to determine a rainfall distribution drainage pattern, fitting in
pattern type 1 and distribution types 2 and 3. However, for all distribution types of rainfall patterns, the one with
the highest last-day rainfall is the most adverse pattern. Therefore, this study recommends building a 3-consecutive
day design rainfall for Cang Long station of pattern type 1 and distribution type 3 for precautionary purposes.