DEVELOPMENT SCHEMES OF THE DRAINAGE NETWORK IN GREENHOUSES
|De enhouse area (ha)||Length (m)||Width (m)
The predominant greenhouse type is that with the area of 1.00 ha up to 2.00 ha. The minimum area of one greenhouse is of 0.5 ha and frequently that of 1.00 ha; the maximum area is of 6.00 ha.
The shape of the green houses (on drawings) is rectangular.
The greenhouses are made of steel or alluminium bars (frames) where glass walls are installed in. The greenhouses walls are supported by a continuous concrete foundation which is burried at a depth of 0.6 m up to 0.9 m.
The roof is also made of frames and is supported by inner piles. This has two slopes at each pile bent, the level difference being of 0.8 m from the supporting pile head level up to the roof ridge. The rainfall waters discharge into canals which are parellel to the greenhouse walls.
The roof supporting piles are metal piles, spaced at 3.2 m one another (within the greenhouse longitudinal crosssection) and 3.0 m within the transversal cross-section.
Within the longitudinal cross-section the piles are linked by metal bars at the height of 2.0 m from the foundation level, and in the transversal cross-house