Shlomo Orr, PhD, P.Eng

Orr & Associates are consulting experts in different disciplines of science and engineering with focus on Subsurface Fluid Dynamics, Hydrogeologic Modeling, Soil Sciences, Water Resources, Oil & Gas Simulations, Geostatistics, and Advanced Analytics. In addition to traditional, physically-based modeling tools, Orr & Associates uses AI and intelligent systems tools (hierarchical machine learning and optimization) for different industrial applications, including water resources, oil, mining, financial planning, and project management.

Consulting Services:

• Hydrogeology — from complex site characterization to modeling/simulations of flow and transport in heterogeneous, porous and fractured formations, including multiphase and non-isothermal flow and transport
• Groundwater and oil reservoir management and optimal control – from water supply to subsurface fluid storage, extraction, productions, and treatment
• Groundwater remediation, including characterization (including discovery of contaminant sources), modeling, optimal remediation design, and optimal restoration
• Mining Water Management – from explorations to environmental assessment, optimal production (of leaching operations), water treatment, mine closure, and restoration.
• Mine dewatering (open pit and underground workings).
• Tailings seepage mitigation, subsurface modeling, and closure.
• Heap leaching, and in-situ leaching – design, modeling, monitoring, enhancing, rinsing, closure, and restoration
• Environmental impact assessment (EIA)
• Monitoring systems – advanced investigations and network optimization
• Mining permit applications
• Wellhead protection and capture zone design, modeling and optimization
• Risk Assessment (related to subsurface transport and seepage)
• Decision Making under uncertainty
• Soil water, contaminated soils, vadose zone hydrology, and soil vapor intrusion
• Oil & Gas: Optimal management and control of water and gas during fracking, including prevention of gas intrusion into overlying freshwater aquifers. Tailing Ponds management and mitigation
• Geotechnical-related seepage modeling and optimal mitigation.

President and CEO of Orr & Associates, Shlomo Orr, PhD, PEng, has over 34 years of extensive consulting, research, and project management experience in the fields of Hydrology and Water Resources, Hydrogeologic flow and transport modeling, Soil and Water Sciences, Multiphase, non-isothermal flow in porous and fractured formations, and Intelligent Control Systems. He earned a PhD in Hydrology and Water Resources with a minor in Soil and Water Sciences, and BSc and MSC in Civil Engineering. He taught undergraduate and graduate course in Civil Engineering, and advised MS and PhD students.

Dr. Orr's background includes modeling, planning, and controlling complex subsurface flow and transport phenomena. He has a broad background in conceptual and computational-numerical modeling of fluid flow and solute transport in saturated and unsaturated porous and fractured formations, including stochastic models that to account for uncertainties and provide a basis for risk assessment.

Dr. Orr has taught undergraduate and graduate courses in Groundwater Hydrology, Hydraulic Engineering, and Geostatistics. He completed advanced work and written major publications on modeling and optimization of uncertain systems. His toolbox spans from simple models to most detailed, complex, numerical, stochastic 3D models, including statistical and machine learning models. Dr. Orr has been a reviewer of major books and top journals in hydrology and water resources and is a member of a special committee on Advanced Analytics within the Society of Petroleum Engineers (SPE).

Expert categories:

• Civil Engineering (General)
• Environment (General)
• Hydrology
• Hydrogeology / Geohydrology
• Groundwater (flow and transport)
• Wellhead protection
• Groundwater Contamination
• Soils (water, vapor)
• Hydraulics
• Environmental Assessment – Impact, Monitoring, Modeling
• Environmental Pollution (subsurface)
• Environmental Remediation (Groundwater remediation)
• Dewatering and Drainage
• Petroleum / Oil & Gas / Fracking
• Water / Wastewater Systems
• Multiphase Flow in the subsurface
• CO2 Sequestration
• Waste Injection
• Geothermal systems