Babitska O. The efficiency of engineering protection systems of gravity and forced types against underflooding and ways of their improvement

Thesis on the Candidate of Technical Science academic degree by specialty 06.01.02 - agricultural melioration (technical science). - Institute for Hydraulic Engineering and Land Reclamation of NAASU, Kyiv, 2010. The thesis is devoted to the operation efficiency scientific substantiation of the engineering drainage systems of gravity and forced types used for protection against underflooding and flooding in irrigated area and settlements in the South of Ukraine and development of the ways of their improvement. On the basis of fundamental characteristics it is proposed the efficiency estimation methods for the drainage systems used for protection against underflooding and flooding. It was specified the conditions and the causes of flooding in the research area and made the assessment of the current technical state of long term protracted drainage systems. It was determined the dynamics of flood areas spreading in wet, normal and dry years and the mechanism of groundwater levels regimes and precipitation against the background of horizontal and vertical drainage. It was proved the efficiency and operational reliability of the horizontal gravity drainage systems as well as unsettles operation mode of the forced drainage systems as a result of their discrete work. The ways of improvement and modernization of forced drainage systems used for protection against underflooding and flooding were scientifically proved and the complex of measures based on the gravity drainage was also proposed. An economical evaluation of the proposed measures efficiency was made.