Drainage outflow in different pipe-drainage variants on gleyic podzoluvisol in the Sava River Valley

Five‐year investigations (1995–99) were carried out on the experimental drainage field “Jelenscak”, Kutina, in Croatia. The field is situated in the Sava River valley, on gleyic podzoluvisol. The trial involved eight pipe‐drainage variants, differing in drainpipe spacing and backfilling. Drainpipe spacings of 15, 20, 25 and 30 m with gravel backfill and spacings of 10, 15, 20 and 25 m without gravel backfill were tested. The shortest duration of drainage outflow was recorded in the variant with a drainpipe spacing of 15 m with gravel backfill and in the variant with a drainpipe spacing of 10 m without gravel backfill. These values are significantly different (P