Avaliação do desempenho de envoltórios de sistemas drenantes do perímetro irrigado de bebedouro - Petrolina -PE.

Abstract

It was evaluated, in four lots of the Bebedouro irrigation district, the yield of flexible PVC subsurface drains wraped with two types of envelopes, OP-20 bidim and rolling flint-stone, used in the agricultural land drainage. The drain systems showed a good yield, since the head loss fraction (he/htot) was inferior to 0.2, where the higher value (0.17) occurred to the tube with rolling flint-stone envelope, while the lower one (0.10) was met for the tube with OP-20 bidim sinthetic envelope.