The average drainage coefficient

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.

7p kethamoi 01-10-2019 10 1   Download