The demand for newly constructing of drainage pumping station in Red river delta has
increased recently. Total drainage volume for the whole region in 2006 was 2406.8m3/s, and it was
predicted to increase to 5181.3m3/s in 2020 [1]. The average drainage coefficient for the year from
2010 to 2020 will be 7.0 l/s per hectar, three and a haft time higher than the average drainage
coefficient for the period from 1954 to 1973; 1.8 times higher than 1973 to 1976 and 1.3 times
higher than 1976 to 2000. This article aims to provide the primary analysis of objective (drainage
requirement) and subjective factors (socio-economic condition, psychology, information, etc)
influencing on the demand of drainage. The out come shows that the draingae demand seems to be
impacted by subjective factors rather than objective ones.
