DwaterX Business Portal

Project Procedure

Legal Basis : Groundwater Act (Article 9-6), 4th Basic Groundwater Management Plan (2022-2031, Ministry of Climate, Energy and Environment)

1. Investigation

   1. Candidate Site Investigation

   Basic / Feasibility Investigation

   • Basic Status Investigation
   • Target Area Selection
   • B/C Analysis
2. Design

   2. Assessing Development Capacity

   Basic / Detailed Design

   • Hydrology and Water Supply Analysis
   • Location and Type of Cutoff Wall
   • Optimal Development Scale Determination
3. Construction

   3. Construction of Underground Cutoff Wall

   Installation Work

   • Plan Announcement, Land Compensation
   • Facility Installation including Cutoff Wall
   • Permit Approval and Completion Notice
4. Management

   4. Completion of Detention Dam Installation

   Facility Operation & Management

   • Facility Inspection and Water Quality Testing
   • Preparation of Operation and Management Manual
   • Pollution Source Management within the Watershed

Candidate Site Investigation (Location Conditions)

• Gentle valleys or basin topography with a mild slope of riverbeds or watersheds
• Areas with chronic drought due to a decrease in groundwater levels and insufficient valley water
• Areas adjacent to demand sites with easy water supply and connection to existing facilities

Alluvial Fan

Old Riverbed

Target Area

Candidate Site Investigation (Evaluation Criteria)

18 criteria: natural, human, and construction factors

Candidate Site Investigation (Investigation Procedures)

Candidate Site Investigation (Investigation Procedures) : Basic Status Survey, Geophysical Exploration/Logging, Pollution Survey, Drilling and Site Survey

1. Basic Status Survey	2. Geophysical Exploration/Logging	3. Pollution Survey	4. Drilling and Site Survey
Data collection and analysis Evaluation of dam location and related facilities	Identification of geological structures and boundaries Aquifer depth understanding	Water quality survey Contamination source distribution analysis	Collection hydrogeological data Analysis of aquifers, fractures, and geological structures

Candidate Site Investigation (Investigation Procedures) : Groundwater Survey, River Survey, Target Site Selection정, B/C Analysis

5. Groundwater Survey	6. River Survey	7. Target Site Selection	8. B/C Analysis
Groundwater presence and conditions survey Groundwater level and quality data	River flow data collection River water quality survey	Survey of water supply and shortage Feasibility analysis based on geology	Feasibility analysis through benefits and alternative water comparison

Investigation Results (Examples)

Investigation Results (Examples) : Electrical Resistivity Survey, Borehole Investigation, Groundwater Contour Map, EC Distribution

Electrical Resistivity Survey	Borehole Investigation	Groundwater Contour Map	EC Distribution

Groundwater Modeling Procedure

1. 01 Model Area Setup
2. 02 Field Data Collection
3. 03 Collection of hydraulic characteristics and variables
4. 04 Boundary Condition Setup
5. 05 Calibration and Sensitivity Analysis
6. 06 Model Construction and Prediction

Construction of Underground Wall

Types of Methods Select considering feasibility, cost, environment, and safety.

Types of Methods : Category, Continuous Wall, Open Cut, Injection, Mixing, Sheet Pile, C.I.P Wall

Category	Continuous Wall	Open Cut	Injection	Mixing	Sheet Pile	C.I.P Wall
Overview	Excavation, rebar insertion, concrete pouring	Excavate, pour reinforced concrete	Drill and inject cement grout or chemicals	Mix soil and hardener using high-pressure air-jet	Insert sheet piles to function as a wall	Sequential drilling forms jointed wall
Advantages	Perfect water cutoff Prevents ground settlement Strong structural safety	Various water cutoff effects Applicable to all grounds Customizable cross-sections	Works in narrow spaces Simple and convenient No ground disturbance	Excellent water cutoff Eco-friendly materials	Simple method Shortens construction time Low cost	Applicable to all grounds Strong wall rigidity Simple management
Disadvantages	Requires large equipment and space High cost Slurry contamination control needed	Costlier than other methods Requires excavation contamination control	Difficult to check sealing or infiltration Low durability Less economic for shallow depths	Affects nearby structures due to high pressure Difficult for gravel or boulder layers	Difficult for gravel or boulder layers Noise and vibration during driving Less sealing if joints are loose	Needs additional sealing methods Requires concrete curing time
Diagram