Norwest: Surface and Groundwater Hydrology


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Surface and Groundwater Hydrology Overview Surface and Groundwater Hydrology Water Control and Management Water Permitting and Complicance Environmental Assessment	Home > Our Services > Water Resources > Surface and Groundwater Hydrology Meeting Surface And Groundwater Challenges Surface and groundwater supply and quality issues can be complex and are surrounded by a variety of compliance regulations. Using our experience and technology, Norwest’s hydrology experts assess your situation and create a cost-effective, efficient strategic plan to address these challenges. Norwest uses analytical and numerical modeling to evaluate surface and groundwater flow and quality. Using these techniques, Norwest professionals are able to analyze existing hydrogeologic conditions, and predict impacts of engineered interventions such as dewatering yield and drawdown. Modeling can be used for urban and rural stormwater runoff and water quality sampling. Norwest's services include: Hydrology Site Characterization Surface Water Resources Evaluation Baseline Monitoring Plans and Data Collection Due Diligence Evaluations Stream Bank Stabilization Floodplain Evaluations Stormwater Management Plans Permitting Support for Point Source Discharge Water Quality Attenuation Planning Regional Water Quality Modeling Stormwater Modeling Sediment Transport Modeling Erosion and Sediment ControlPlanning and Engineering Landowner Dispute Evaluation Compliance Monitoring Engineering Site Investigations Slope Stability Hydrology Reservoir Design, Certification, and Construction Oversight Road, Ditch, Culvert Design and Construction Oversight Weir & Flume Design Reclamation Plans and Certification SPCC Certification Water Treatment Design/Implementation/Monitoring Mining Field Evaluations and Pilot Testing Dewatering Projections and Designs Probable Hydrologic Consequences Evaluations Alluvial Valley Floor Investigations Design of Diversions &Post Mining Topography Reclamation Water Rights Water Rights Tabulations Stream Depletion Modeling Augmentation Plans Reservoir Storage Applications to State Agencies and MSHA Enlargement Petitions Hydrogeology Water Supply Well Design and Drilling Oversight Aquifer Testing, including Pumping Tests, Interference Tests, and Slug Tests Permeability Testing (Injection Falloff Testing – IFOT) Aquifer Classification Evaluations Injection Well Design and Permitting	Case Study: Water Mgmt. Mine Water Management & Stability Control Situation: Norwest consulted with a mining company that had been experiencing two separate instances of localized instability within a mining area. The first area was characterized as a creep type dump failure caused by placing waste material on what proved to be a weak foundation layer. The second area was characterized as a block type wall failure, which occurred along a weak “aqua putty” layer within the coal seam. Norwest quickly engineered a creative modification to the mine plan to allow for continued mining within the pit. Solution: Norwest developed long-term remediation plans to mitigate the pit wall instability, which included detailed mining and water management plans and permit application submittals. The wall failure remediation plan required mining through two large sediment ponds located in series near the edge of the mine pit backfill, allowing for the pit wall angle to meet the stability requirements. After removing the weak aqua putty layer, a buttress of overburden material was placed to allow the replacement ponds to be reconstructed on a stable backfill surface. An interim water management plan allowed the ponds to be temporarily removed from service during the seasonal dry period. Result: Norwest developed the detailed permitting and construction plans within a compressed schedule. Approvals were quickly obtained from State and Federal agencies so that implementation of the plan began on time with the exception of the mining and buttress construction which took a little longer than expected. Nevertheless, the interim water management functioned effectively to keep operations going smoothly despite near record rainfalls. Norwest’s efforts were pivotal in maintaining safe mining conditions and meeting coal extraction schedules.
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