Technical Efficiency of the Subsurface Drainage on Agricultural Lands in the Moldova River Meadow

Abstract

This study aims to investigate the technical efficiency of different subsurface drainage variants, in terms of the depth of the tile drains, spacing between the drain lines, type and thickness of the drain + filter complex, and the improvement procedures. Within the four variants, the discharge rate of the soil moisture excess was studied. In variants A and D, the spacing between drains is 20 m, and in the variants B and E, the spacing is 15 m. The depth of the tile drains is 0.8 m in variants D and E and 1.0 m in variants A and B. In variant A, tile drainage was combined with land shaping in the bedding system with top of ridges and furrows. Soil moisture was determined on checkpoints placed on drain cross section, at 2 m from drain lines, and of the middle of the drain spacing. In the version with land shaping, the drain lines located under the furrows favor the excess moisture removal. A similar technical efficiency was recorded in unimproved variant but with spacing between drains of 15 m. Best efficiency at removing excess water was registered in variant of the filtering material from ballast associated with flax strains.

Effects of combined drip irrigation and sub-surface pipe drainage on water and salt transport of saline-alkali soil in Xinjiang, China

“…Our study also showed that a shallow and dense sub-surface pipe laying pattern is more suitable for the improvement of saline-alkali soil in Xinjiang. Radu et al (2017) studied sub-surface drainage efficiency under a combination of sub-surface pipe drainage and drip irrigation in the Moldova River Meadow, and pointed out that the best laying pattern for sub-surface pipes is 20.0 m spacing and 1.0 m depth. In another study, Zhang et al (2014) investigated the salt desalination rate of coastal saline soil achieved by flood irrigation and sub-surface pipe drainage, and the results indicated that soil salt content decreased from 14 to 6 g/kg after 3 cycles of irrigation and drainage experiments, with an irrigation amount of 300-400 mm.…”

Water Quality and Anthropogenic Pressures in a Changing Environment: The Arges River Basin, Romania

“…These hydromorphological changes such as dams, reservoirs, canals, diversions with changes in the profile of the surface water body, can in turn cause changes such as interruptions of sediment transport, changes in hydraulic and hydrological characteristics (reduced water flow), loss of areas flooding or drying of wetlands, Water Quality and Anthropogenic Pressures in a Changing Environment: The Arges River Basin… DOI: http://dx.doi.org/10.5772/intechopen.101790 as well as the direct damage to the biota and disruption of biological continuity. The impact of these changes and the subsequent effects lead to the disappearance of aquatic communities [22].…”