PUBLICATIONS of Prof. C.B. Abadjiev Publications in Refereed Journals and Proceedings 1. Testing of Gunit and its Ingradients. Hydrotechnique and Irrigation,Sofia, 1961, 5, pp. 133-137. (Coauthors P.Darvarov and P. Kaishev), (Title translated from Bulgarian). 2. Flood Deviation and Release Structurs of Arch Dams. Hydrotechnique and Irrigation, Sofia,1961, 4, pp. 105-108. (Title translated from Bulgarian). 3. Seepage Investigation under the Spillway of the Belene Dam on the river Danube. Transaction of the Hydraulic Labotatory of Higher Institute of Civil Engineering-Sofia, 1966, 7, pp. 123-150. ( Coauthor L. Kotov), (Title translated from Bulgarian). 4. Seepage Investigation under the Power Station of the Belene Dam on the River Danube. Transaction of the Hydraulic Labotatory of High Institute of Civil EngineeringSofia, 1966, 7, pp. 181-200. ( Coauthor L. Kotov), (Title translated from Bulgarian). 5. On the Solution of the Equation of the Steady Nonuniform Flow in Prismatic Beds. Technicheska Misal, Sofia,1967, 3, pp. 49-57. (Title translated from Bulgarian). 6. Electrointegrator for Solving of Nonlinear Parabolic Partial Differential Equations. Hydrotechnical Construction, Sofia, 1968, 9-10, pp. 34-37. ( Coauthor A. Gitev), (Title translated from Bulgarian). 7. Smal-Sized Modeling Device for Solving of Nonsteady Problems. Proceedings of the Third Allunion Symposium on Applying of Mathematical Methods for Hydrogeological investigations. Moscow, Mai 1968, pp. 3-9. ( Coauthor A. Gitev) (Title translated from Russian). 8. Generalized Method of Slope Stability Investigation Taking in Account the Hydrodynamic Forces. International Dam Symposium, Varna, May 1989, p.16. (Coauthor I. Bachev),(Title translated from Bulgarian). 9. Universal Computer Program for Slope Stability Investigation of Embankment Dams. International Dam Symposium, Varna, May 1989, pp. 12. ( Coautor E. Bogdanov), (Title translated from Bulgarian). 10. Investigation of the Nonsteady Temperature Regime of Concrete Dams during Construction Period by means ot Electrical Analogy. International Dam Symposium, Varna, May 1989, pp. 8. (Coauthors S. Iliev and A. Gitev), (Title translated from Bulgarian). 11. Seepage Investigation under the Ship Lock of the Belene Dam on the River Danube. Transaction of the Hydraulic Labotatory of High Institute of Civil Engineering-Sofia, 1970, 9, pp 103-114. ( Coauthor L. Kotov), (Title translated from Bulgarian). 12. Seepage in Embankment Dams During Drawdawn. Ph.D. Dissertation. Higher Institute of Civil Engineering-Sofia, 1969, p. 256. (Title translated from Bulgarian). 13. Seepage and Slope Stability of the Upstream Slope of Embankment Dams during Drawdown. Sofia, Hydrotechnical Construction, 1968, 3-4, pp. 8-18. (Title translated from Bulgarian). 1 14. About the Criterion on Fast Drawdown at Determining the Stability of Upstream Slope of Embankment Dams. Sofia, Hydrotechnique and Irrigation, 1968, 8, pp. 229-232. (Title translated from Bulgarian). 15. Limit Conditions Determination for Definition of the Stream Lines by Electric Analogy at Drawdown. Transaction of the Hydraulic Labotatory of the Higher Institute of Civil Engineering-Sofia, 1970, 9, pp 153-166. (Title translated from Bulgarian). 16. Electrointegrator of Electrohydrodynamic Tipe with Larger Possibilities. Sofia, Hydrotechnique and Irrigation, 1969, 9, pp. 270-274. (Coauthor A. Gitev),(Title translated from Bulgarian). 17. About Seepage in Earthfill Dams with Core during Drawdown. Technicheska Misal, Sofia, 1970, 2, pp. 47-54. (Title translated from Bulgarian). 18. Filtration in Earth Dams with Clay Core during Drawdown. 11th Science Week, Damas, Syria, October 1970, pp.1-16. 19. Seepage in Earthfill Dams during Drawdown. Transaction of the Hydraulic Labotatory of the High Institute of Civil Engineering-Sofia, 1970, 10, pp. 113-122. (Title translated from Bulgarian). 20. Modeling of Unconfined Nonsteady Vertical-Planed Seepage by Continuous Electropervious Media. Sofia, Technicheska Misal, 1971, 1, pp. 43-56.. (Coauthor L. Luckner),(Title translated from Bulgarian). 21. Reliable Cases for Slope Stability Analysis of Embankment Dams. Sofia, Hydrotechnique and Irrigation, 1970, 9, pp. 14-17. (Title translated from Bulgarian). 22. About the Filters of Rockfill Dams. Transaction of the Hydraulic Labotatory of High Institute of Civil Engineering-Sofia, 1970, 10, pp. 164-177. (Title translated from Bulgarian). 23. About Seepage in Uniform Earthfill Dams during Drawdown. Yearbook of the High Institute of Civil Engineering-Sofia, 1970, 1, pp. 38-48. (Title translated from Bulgarian). 24. Seepage Investigation of the Technical Water Supply of Nuclear Power Station Kozlodui. Yearbook of Energoproekt, Sofia, 1970, 14, Book 1, pp. 39-48. (Coauthors N. Dimitrov and P. Petrov). . (Title translated from Bulgarian). 25. Investigation of the Nonsteady Temperature Field during Construction of Concrete Dams by Electric and Numeric Modeling. Yearbook of Energoproekt, Sofia,1970, 14, pp. 39-48. (Coauthors E. Marinov and K. Damov), (Title translated from Bulgarian). 26. Determination of the Phreatic Surface in Eartfill during Drawdown. Technicheska Misal, 1971, 5, pp 55-59.(Title translated from Bulgarian). 27. Practical Method of Seepage Modeling through Relative Nonpervious Stratum by Electric Analogy of Horizontal 2D Models. Proceedings of the International Symposium on Experimental Seepage Investigations. Varna, Bulgarian Academy of Science, May 1971, pp. 313-322. (Coauthor N. Dimitrov), .(Title translated from Bulgarian). 2 28. Electrointegrator with Direct Measurement of the Potentials by Voltmeters. Proceedings of the International Symposium on Experimental Seepage Investigations. Varna, Bulgarian Academy of Science, May 1971, pp. 393-397. (Coauthors I. Bachev and S. Sivchev), .(Title translated from Bulgarian). 29. Electrical Investigation of the Temperatur Regime of the Steam Generators Insulation. Energetique 1971, 12, pp. 21-25. (Coauthor H. Hristov), (Title translated from Bulgarian). 30. Influence of the Internal Draining Zone on the Steady Seepage in a Nonhomogeneous Medium. Transaction of the Hydraulic Labotatory of the High Institute of Civil EngineeringSofia, 1973, 11, pp. 15-37. (Coauthor D. Toshev), (Title translated from Bulgarian). 31. Analitic Determination of the Nonsteady Temperature Field in the Lining of Hydraulic Tunnels and the Rock Media around, Developed by the Cooling Action of the Flowing Water through Them. Sofia, Technicheska Misal, 1972, 3, pp. 43-50. (Title translated from Bulgarian). 32. Numerical Determination of the Nonsteady Temperature Field around Hydraulic Tunnels, Developed by the Cooling Action of the Flowing Water through Them. Hydrotechnique and Irrigation, 1972, 10, pp. 13-17. (Coauthor E. Bogdanov), (Title translated from Bulgarian). 33. Direct Determination of some Complicated Original of Laplace Operators. Yearbook of the High Technical Institutes-Sofia, Mathematics, 1972, vol. 8, book 1, pp. 159-178. (Coauthor S. Koprinski), (Title translated from Bulgarian). 34. Graphical Method for Slope Stability Analysis of the Outside Parts of Hydraulic Filled Dams and Tailings Dams. Rudodobiv, 1972, 9-10, pp. 32-36. (coauthor A. Karadimov), (Title translated from Bulgarian). 35. About the Nonsteady Unconfined Seepage on Inclined Impervious Base. Yearbook of the High Institute of Civil Engineering-Sofia, Hydrotechnique, 1973, vol. 24, 3, pp. 161181.. (Title translated from Bulgarian). 36. Analytical Determination of Slope Stability of Embankment Dams. Yearbook of the High Institute of Civil Engineering-Sofia, Hydrotechnique, 1973, vol. 24, book 3, pp. 5-17. (Coautor S. Koprinski), (Title translated from Bulgarian). 37. Analitical Solution of the Linear Equation of the Nonsteady Unconfined Seepage trough Uniform Aquifer on Sloped Impervious Ground. Transaction of the Hydraulic Labotatory of the High Institute of Civil Engineering-Sofia, 1973, 11, pp. 119-144. (Title translated from Bulgarian). 38. Seepage through Homogeneous Earth Dams with Stripped Drainage on Impervious Ground. Annual of High Institute for Civil Engineering, Sofia, Vol. 25, Book 1, pp. 193 212, 1972-1974. (Coauthor A. Muleshkov), (Title translated from Bulgarian.) 39. Seepage through Embankments with Segmented Concrete Linings. Sofia, Technitcheska Misal, 1973., 1, pp. 73 - 80, (Coauthor A. Muleshkov), (Title translated from Bulgarian). 40. Seepage Investigation of Large Cannals in Earthfill and Complicated Geological Conditions. Yearbook of Energoproekt, 1973, 15, pp. 205-214. (Coauthor N. Dimitrov), (Title translated from Bulgarian). 3 41. Seepage through Earthfill Dam with Clay Core on Pervious Stratum. Sofia, Hydrotechnique and Irrigation, 1973, 1, pp. 12-15. (Coauthor S. Kinarev), (Title translated from Bulgarian). 42. Analitical Slope Stability Analysis of the Outside Parts of Hydraulic Filled Dams and Tailings Dams. Rudodobiv, 1973, 5, pp. 18-23. (Title translated from Bulgarian). 43. Fluctuation of Groundwater Level in the River Bank. Sofia, Technicheska Misal, 1972, 6, pp. 46-57. (Title translated from Bulgarian). 44. Influence of the River Water Level Fluctuation on the Groundwater Level in the Bank. Sofia, Technicheska Misal, 1973, 3, pp. 49-58. (Title translated from Bulgarian). 45. Influence of the Surface Infiltration on the Ground Water Level in the Bank. Sofia, Technicheska Misal, 1974, 4, pp. 55-63. (Title translated from Bulgarian). 46. Influence of the Alimentation Flow from the Mountain on the Groundwater Level in the River Bank. Bulgarian Academy of Science, Hydrology and Meteorology, 1973, 5, pp. 4755. (Title translated from Bulgarian). 47. Investigation of Slope Stability of Embankment Dams. Hydrotechnique and Irrigation, 1973, 6, pp 1-4 and 7, pp. 1-5. (Coauthor I. Bachev), (Title translated from Bulgarian). 48. Determination of Seepage in Tailings Dams by the Finite Element Method. Rudodobiv, 1973, 10, pp. 22-28. (Coauthor E. Marinov), (Title translated from Bulgarian). 49. Seepage Through Homogeneous Earth Dam with Discontinuous Drainage on Impervious Ground. Annual of High Institute for Civil Engineering-Sofia, 1973., Vol. 24, Book 3, pp. 215 - 227, (Coauthor A. Muleshkov), (Title translated from Bulgarian). 50. Seepage Investigation of the Ash Dam of Maritza East 3 Thermal Power Station. Yearbook of Energoproekt, Sofia, 1974, 16, pp. 579-584. (Coauthor I. Iordanov), (Title translated from Bulgarian). 51.a. About the Groundwater Fluctuations in Inclined Aquifer Bound between two Reservoirs. 51.b. About the influence and the Surface Alimentation on the Groundwater Fluctuations in Inclined Aquifer Bound between two Reservoirs. Annual of High Institute for Civil Engineering-Sofia, 1972-1974, Vol. 25, Book 1, pp. 105-164. (Title translated from Bulgarian). 52. Determining of the Groundwater Fluctuations in Long Uniform Aquifer under the Influence of Lateral Underground Flow. Annual of High Institute for Civil EngineeringSofia, 1972-1974, Vol. 25, Book 1, pp. 105-164. (Title translated from Bulgarian). 53. Seepage in Clay Cores and Uniform Earthfill Dams during Rapid Drawdowns. Yearbook of Energoproekt, Sofia, 1974, 16, pp. 585-598. (Coauthor S.Tassev), (Title translated from Bulgarian). 54. Consideration of the Imperfection of Reservoirs in Determination of Unsteady Seepage. Annual of High Institute for Civil Engineering-Sofia, 1975-1976, 26, Book 2, pp. 19 - 30,. (Coauthor A. Muleshkov), (Title translated from Bulgarian). 4 55. Seepage through Homogeneous Aquifer Bounded between Two Reservoirs, the One of Which Imperfect. Annual of High Institute for Civil Engineering, Sofia, Bulgaria, 26, Book 2, pp. 31 - 50, 1975-1976. (Coauthor A. Muleshkov), (Title translated from Bulgarian). 56. Seepage Investigation of Earthfill Dam over Permeable Foundation. Annual of High Institute for Civil Engineering, Sofia, Bulgaria, 26, Book 2, pp. 101-112, 1975-1976. (Coauthor D. Toshev), (Title translated from Bulgarian). 57. Seepage in Earthfill Dams Considering Their Nohomogeneity in Vertical Direction. Proceedings of the Third International Symposium “Seepage through Porous Media,”Kiev, Octcber 1976, Vol. 3, pp 50-58. (Title translated from Russian). 58. Seepage Investigation of the Nikopol - Turnu Magurele Projekt on Danube River. Sofia, Hydrotechnical Construction, 1978, 1, pp. 2-4. (Coauthors N. Dimitrov and D. Toshev), (Title translated from Bulgarian). 59. Seepage Problems during Construction of the Nikopol - Turnu Magurele Projekt on Danube River. Hydrotechnical Construction, 1978, 3, pp. 7-10. (Coauthors D. Vassilev and D. Toshev), (Title translated from Bulgarian). 60. Theoretical Determination of Water Permeability of Screens from Polymer Folio over Clay Layer, Technitcheska Misal, 1978, 6, pp. 35 - 42. (Coauthor A. Muleshkov), (Title translated from Bulgarian). 61. Analytical Determination of Seepage in Uniform Earthfill Dams Considering the StrainStress State. Reports of Bulgarian Academy of Science, 1979, vol.32, book 9, pp. 12151218. (Title translated from Russian). 62. Some Investigations and Considerations for Construction of Tailings Dams by Hydrocycloning. Sofia, Rudodobiv,1980, 11, pp. 25-27. (Coauthors A. Karadimov and P. Korenev), (Title translated from Bulgarian). 63. Determining of Water Permeability of Screen with Two Layers of Polymer Folio and Clay Core Between Them. Sofia, Technitcheska Misal, 1980, 2, pp. 59 - 66,. (Coauthor A. Muleshkov), (Title translated from Bulgarian). 64. Determining of Water Permeability of Screen with Three Layers of Polymer Folio and Clay Layers between Them. Sofia, Technitcheska Misal, 1981, 1, pp. 57-62,. (Coauthor A. Muleshkov), (Title translated from Bulgarian). 65. Determining of Water Permeability of Screen with Two Layers of Polymer Folio and two Clay Layers. Sofia, Technitcheska Misal, 1981, 3, pp. 53-58,. (Coauthor A. Muleshkov), (Title translated from Bulgarian). 66. Application Conditions for Upstream Spigotted Tailings Dams. Sofia, Rudodobiv, 1980, 1, pp. 22-25. (Coauthor A. Karadimov), (Title translated from Bulgarian). 67. About the Starter Dam Structure and Height of Upstream Spigotted Tailings Dams. Sofia, Rudodobiv, 1980, 3, pp. 11-15. (Coauthor A. Karadimov), (Title translated from Bulgarian). 68. Seepage through Tailings Dams. Dr.of Science Dissertation. 1976. p. 294. High Institute for Civil Engineering - Sofia. (Title translated from Bulgarian). 5 69. About Seepage at Tailings Dams. Sofia, Rudodobiv, 1973, 3, pp. 19-25. (Title translated from Bulgarian). 70. Analytical Determination of Seepage in Tailings Dams Considering their Smoothly Variable Nonhomogeneity. Reports of Bulgarian Academy of Science, 1979, vol. 28, book 1, pp. 113-116. (Title translated from Russian). 71. Seepage Pecularities of Spigotted Tailings Dams. Sofia, Hydrotechnical Construction, 1974, 3, pp. 5-8. (Title translated from Bulgarian). 72. Seepage through Mill Tailings Dams, 12th International Congress on Large Dams, Mexico, 1976, Question 44, R. 18, pp. 381-393. 73. About Seepage Through Spigotted Tailings Dams. Sofia, Rudodobiv, 1975, 5, pp. 1115. (Title translated from Bulgarian). 74. Seepage in the Smoothly Variable Nonuniform Media of the Tailings Dams. Sofia, Technitcheska Misal, 1976, 3, pp. 45-50. (Title translated from Bulgarian). 75. Analytic Determination of Seepage through Tailings Dams Considerting the Horizontal Nonhomogeneity and the Ground Inclination. Bulgarian Academy of Science, Engineering Geology and Hydrogeology, 1977, 6, pp.3-12. (Title translated from Bulgarian). 76. Analytic Determination of Seepage through Tailings Dams Considerting the Horizontal and Vertical Nonhomogeneity and the Base Inclination. Sofia, Technitcheska Misal, 1977, 4, pp. 53-59. (Title translated from Bulgarian). 77. Influence of the Infiltration through the Beech on the Seepage through Spigotted Tailings Dams. Sofia, Hydrotechnical Construction, 1977, 1, pp. 17-21. (Title translated from Bulgarian). 78. Earth Dams with Screen of Polymeric Films and Rubber-Bitumen Composition Layers. 14th International Congress of Large Dams, Rio de Janeiro, 1982, Question 55, R. 34, pp. 581-587. ( Coauthor A. Batkov ). 79. Risseverhindernde Tonkernkonstruktion in Erd- und Steindammen. Beitrage zur Funften Fachtagung Talsperrenbau, Weimar, 1984. Wissenschaftliche Zeitschrift der Hochschule fur Architektur und Bauwesen, Weimar, 1984, Heft 1-2, S. 10-12. (Mitautoren G. Stefanott und G. Markov) (In German). 80. Prognostic of the Gradation of the Hydraulic Dposited Tailings along the Beach and Their Characteristics. Fift Seminar on Hydrotransport and Sedimentation. 3-7 September, Wroclav, Poland, D 1, pp. 1-42. (Title translated from Russian). 81. Automated Spillway Structure on the Decant Tower. In “Sovershenstvovanie Techniki i Technologii Skladirovania Othodov v Usloviach Kompleksnogo Ispolzovania Nedr”. Mehanobr, Leningrad, 1984, pp. 145-148. ( Coauthor I Kalchev ) . (Title translated from Russian). 82. Slope Stability Determination ot Embankment Dams Considering their Strain-Stress State. Sofia, Hydrotechnical Construction, 1984, 9, pp. 21-24. . ( Coauthors G. Muleshkov and B. Benshila) (Title translated from Bulgarian). 6 83. Estimation of the Physical Characteristics of Deposited Tailings Dams of Nonferrous Metallurgy. Proceedings of the 11th International Conference on Soil Mechanics and Foundation Engineering, San Francisco, 12-16 August 1985, 3/C/1, pp. 1231-1234. 84, Improved Upstreem Construction of Tailings Dam. Proceedings of the 11th International Conference on Soil Mechanics and Foundation Engineering, San Francisco, 12-16 August 1985, 3/C/1, pp. 1235-1236. 85. Determination of Tailings Consolidation for a High Spigotted Upstream Tailings Dam. Proceedings of the 9th European Conference on Soil Mechanics and Foundation Engineering, Dublin, 1987, pp. 355-357. ( Coauthors T. Germanov and G. Markov) 86. Determination of the Strain-Stress State of the Embankment Dam wit Asphaltic Concrete Cores “Borovitza”. Proceedings of the Second National Conference on Soil Mechanics and Foundation Engineering, Russe, October 1987, pp. 89-99. ( Coauthors G. Muleshkov, A. Dimitrov and G. Hankov). (Title translated from Bulgarian). 87. Investigation of Geotextile for Filters in Tailings Dams. Proceedings of the Second National Conference on Soil Mechanics and Foundation Engineering, Russe, October 1987, pp. 425-429. 88. About the Seepage in Some Embankment Dams during Drawdown. Sofia, Technical Progress in the Water Ressources, 1987, 6, pp. 3-6. ( Coauthor K. Belbashir). 89. Improved Spigotted Tailings Dam Structure. In “Sovershenstvovanie Techniki i Technologii Skladirovania Othodov Mineralnogo Siria”. Mehanobr, Leningrad, 1988, pp. 145-148. (Title translated from Russian). 90. For Under Presssure Colectors at Tailings Dams. Sofia, Minno Delo,1988, 2. 35-38. (Coauthor I. Kalchev). (Title translated from Bulgarian). 91. Soil-Geotextile Interaction in Filter Systems. Proceedings of the 12th International Conference on Soil Mechanics and Foundation Engineering, Rio de Janeiro, 13-18 August 1989, 23/1, pp. 1645-1646. (Coauthor I. Kalchev). 92. Tailings Dam of the Copper Mining Plant Elatzite after Eight Years of Operation. The Embankment Dam, Proceedings of the Sixth Conference of the British Dam Society, Nottingham, 12-15 September 1990, pp. 59-62. (Coauthor A. Karadimov). 93. Improvement of a Tailings Dam Stability after Nine Years of Operation. ICOLD, International Symposium on Safety and Rehabilitation of Tailings Dams, Sydney, May 1990, pp. 146-155. 94. Investigation of Geotextiles as Filters in Hydraulic Fill Tailings Dams. Proceedings of Fourth International Conference on Geotextiles, Geomembranes and Related Prducts, The Hague, 28 May-1 June 1990, pp.307-710. (Coauthor I. Kalchev). 95. Stability of a Dike on a Low Permeable Stratum Underlaid by a Highly Permeable Layer with Direct Contact to a High-Water River. 17th International Congress on Large Dams, Vienne, 1991, Question 66, R. 1, pp. 1-10. ( Coauthors G. Muleshkov and V. Fillipov ). 96. Beech Inclination and Grading of the Spigotted Tailings of Ustream Tailings Dam ‘Assarel”. “Hydromehanisation 7”, 7th International Kolloquium for Hydromehanization, 7 Varna, 4-6 September 1991. p.6. (Coauther S. Troshanov). (Title translated from Bulgarian). 97. Consolidation of Hydraulic Filled Tailings Dams. “Hydromehanisation 7”, 7th International Kolloquium for Hydromehanization, Varna, 4-6 September 1991. p.7. (Title translated from Bulgarian). 98. Instrumentation and Monitoring of Spigotted Tailings Dams. “Hydromehanisation 7”, 7th International Kolloquium for Hydromehanization, Varna, 4-6 September 1991. p. 7. (Coauther R. Petrov). (Title translated from Bulgarian). 99. Impact of Extreme Floods on Dyke Stability by Means of Pore Pressure Increase in the Bottom Pervious Layer. ICOLD, International Symposium on Dams and Extreme Floods, Grenada, September 1992. pp. 168-177. (Coauthor S. Modev). 100. Reassessment of Bearing Capacity of Kardjaly Arch Dam and its Banks Stability. ICOLD, International Workshop on Dam Safety Evaluation, Grindelwald, Switzerland, 2628 April 1993. Vol. 1, pp. 211-222. (Coauther N. Dimitrov). 101. Experience and Problems of the Mill Tailings Hydrotransport in Bulgaria. “Hydromehanisation 8”, 8th International Kolloquium for Hydromehanization, Magdeburg, Germany, 21-23 September 1993. 102. Safety Assessment and Stability Improvement of the Upstream Slope of Earth Dams. 18th International Congress on Large Dams, Durban, 1994, Question 68, R. 20, pp. 261273. 103. Tailings Dams Design of Drainage. International Commission on Large Dams, Bulletin 97, 1994, p. 119. 104. Improving the Operation of the Dams, Tailings Dams and Ash Dams. National Conference “Safety and Operation Problems of Dams and Tailings Dams. Sofia, 23 March 1994, pp. 27-33. (Title translated from Bulgarian). 105. Safety Control of Embankment Dams. National Conference “Safety and Operation Problems of Dams and Tailings Dams. Sofia, 23 March 1994, pp. 42-47. (Title translated from Bulgarian). 106. Monitoring of Tailings Dams. International Commission on Large Dams, Bulletin 104, 1996, p. 84. 107. A Practical Method for Estimating the Grading of Hydraulically Deposited Tailings Across the Beach. Second International Conference on Mining and Industrial Waste Management Conference, Johannesburg, 2-4 June 1997. p. 7. 108. Horizontal or Vertical Drains in Tailings Dams? . Second International Conference on Mining and Industrial Waste Management Conference, Johannesburg, 2-4 June 1997. p. 7. 109. Taking Warnings by the Failure of “Maritza Istok 1” Ash Tailings Dam. 19th International Congress on Large Dams, Florence, 1997, Question 75, R.1, pp. 1-10. (Coauthor N. Dimitrov). 8 110. Safety Inspection and Assessment of Rockfill Dams with Clay Cores. ICOLD, International Symposium on Rehabilitation of Dams, New Delhi, November 1998. pp.7-15. (Coauthor N. Dimitrov). 111. Experience with Dam “Borovitza”, the First Dam with Asphaltic Concrete Core in Bulgaria. Proceedings of the Sixth Bulgarian National Congress on Large Dams, Semkovo, May 1999, pp. 2-15. (Coauthors G. Hankov and E. Shilegov). (Title translated from Bulgarian). 112. Design, Construction and Monitoring of “Assenovetz“ Dam. Proceedings of the Sixth Bulgarian National Congress on Large Dams, Semkovo, May 1999, pp. 16-29. (Coauthors K.Nestorov, D. Rainov and P. Sarnev). (Title translated from Bulgarian). 113. Experience Gained from the Design, Construction and Monitoring of “Srechenska Bara“ Dam. Proceedings of the Sixth Bulgarian National Congress on Large Dams, Semkovo, May 1999, pp. 30-40. (Coauthors K.Nestorov and S. Georgiev). (Title translated from Bulgarian). 114. Optimisation of Dam Monitoring System of Earth-Rockfill Dams. Proceedings of the Sixth Bulgarian National Congress on Large Dams, Semkovo, May 1999, pp. 78-94. (Title translated from Bulgarian). 115. Security Criteria for the Asphaltic Concrete Core Fill Dams. Proceedings of the Sixth Bulgarian National Congress on Large Dams, Semkovo, May 1999, pp. 95-102. (Title translated from Bulgarian). 116. Benefits of the Iron Gate 1 and 2 Projects on the Danube River and Their Adverse Downstream Impact. ICOLD, Workshop on Benefits of and Concerns about Dams. Case Studies. Antalya, Turkiye, September, 1999. (Coauthors S. Rainov, E. Marinov and B. Vatov). 117. Optimization of Rockfill and Earthfill Dams Monitoring Systems. 19th International Congress on Large Dams, Beijing, September, 2000, Question 78, R.16, pp. 233-248. 118. Investigation for Hydraulic Fracturing in a Clay Core Rockfill Dam. ICOLD Symposium “Operation, Rehabilitation and Upgrading of Dams.Sofia, 2-6 June 2008. 119, Experience with “Borovitza” Dam, the First Dam with Asphalt concrete Core in Bulgaria. ICOLD Symposium “Operation, Rehabilitation and Upgrading of Dams.Sofia, 2-6 June 2008. 120. Examples to Upgrading the Seepage Control of Dams. 20th International Congress on Large Dams, Brasilia, Mai, 2009, Question 90, R.33. Books: Study book on hydraulic structures, Ed. Technika, 351 p. Editions 1975, 1978 and 1991. Tailings Dams Design of Drainage, ICOLD Bulletin No 97, 1994, 119 p. Monitoring of Tailings Dams, ICOLD Bulletin No 104, 1996, 84 p. Sofia, June 2009 9