Pumping Test (Aquifer Test)
A Pumping Test, also known as an Aquifer Test, is a critical step in understanding the performance, capacity, and sustainability of a water borehole. At NASSA DRILLING & GENERAL SUPPLY LTD, we offer professional pumping test services to determine the yield of boreholes and the hydraulic properties of aquifers.
These tests help clients, engineers, and regulatory bodies make informed decisions about borehole design, pump sizing, groundwater abstraction rates, and long-term resource management.
Purpose of a Pumping Test
- Determine the safe yield of the borehole (how much water can be sustainably extracted)
- Assess the recovery rate of the aquifer
- Establish the drawdown behavior during pumping
- Provide data for pump selection and borehole sizing
- Comply with regulatory and environmental standards
- Support groundwater modeling and water resource planning
Our Pumping Test Services Include:
- Step Drawdown Test
- Carried out in successive stages with increasing pumping rates
- Determines well efficiency and optimal pumping rate
- Constant Rate Pumping Test
- Conducted at a constant pumping rate (usually for 24–72 hours)
- Measures aquifer transmissivity and storage coefficient
- Evaluates long-term performance of the borehole
- Recovery Test
- Monitors water level recovery after pumping stops
- Confirms aquifer recharge behavior
Test Procedure
- Pre-Test Inspection
- Borehole depth, static water level, and integrity checks
- Test Pump Installation
- Submersible pump installed at recommended test depth
- Data Monitoring
- Use of dip meters, electric water level loggers, and flow meters
- Record water levels, pumping rate, and drawdown intervals
- Recovery Observation
- Measure how quickly water levels return to normal after the pump is shut off
- Data Analysis & Interpretation
- Use analytical models (e.g., Theis, Cooper-Jacob) to calculate aquifer properties
- Technical Reporting
- Detailed report with graphs, tables, and professional recommendations
Deliverables
- Pumping Test Report (PDF & print-ready)
- Drawdown and recovery curves
- Calculated aquifer parameters (transmissivity, storativity, specific yield)
- Safe pumping rate and pump installation recommendations
- Compliance certification (if required by local authority)
Industries Served
- Community Water Supply Projects
- Agricultural Irrigation Developments
- Industrial and Mining Water Use
- Government & NGO Water Programs
- Engineering Consultants and Hydrogeologists
Why Choose NASSA for Aquifer Testing?
✅ Experienced Hydrogeological Team
✅ Accurate Data Collection and Interpretation
✅ Modern Equipment (flow meters, loggers, submersible pumps)
✅ CRB-Certified and Compliant Services
✅ Reliable Reporting for Regulatory Approval