BOREHOLE WATER STORAGE TANK INSTALLATION AND PUMP AUTOMATION

A borehole water supply system needs more than a properly selected pump. Water storage, tank positioning, pipe sizing, automatic controls, and overflow protection all contribute to reliable water distribution. A well-designed system can supply homes, apartments, farms, schools, institutions, and commercial properties while reducing unnecessary pump operation.

Pro-Logic Technologies Limited provides technical support for borehole water storage system planning, pump automation, tank-level controls, pipework assessment, electrical control integration, and system testing.

1. Why Install a Water Storage Tank for a Borehole?

A storage tank holds water pumped from the borehole until it is needed. Instead of requiring the borehole pump to respond directly to every tap opening, a storage arrangement can allow the pump to refill the tank according to a planned operating cycle.

The benefits may include:

Maintaining a reserve of water for periods of high demand.
Separating borehole pumping from immediate household consumption.
Supporting more predictable pump operating schedules.
Reducing frequent pump starts when the system is correctly designed.
Providing storage for irrigation and commercial water use.
Making it easier to monitor water consumption and supply interruptions.

Storage does not increase the borehole's sustainable yield. The tank must be filled at a rate compatible with the water available from the borehole.

2. Choosing the Correct Water Tank Capacity

Tank capacity should be based on actual water demand, the borehole's sustainable yield, pumping hours, available space, and the consequences of a supply interruption.

A small household may have different storage requirements from a block of apartments, a school, or an irrigation project. The design should consider daily consumption and peak demand rather than choosing a tank size simply because it is commonly available.

For an initial estimate, calculate the expected daily demand and decide how much reserve is required. Then assess whether the borehole can replenish that volume within the available pumping period.

For example, if a property uses 2,000 litres per day, a tank with a nominal capacity of 2,000 litres does not automatically provide a full day's usable reserve. The actual usable volume may be lower because of the outlet position, operating levels, reserve requirements, and the need to prevent the pump from running under unsuitable conditions.

Where water demand is high or variable, consider whether multiple tanks or a larger storage arrangement would be more appropriate.

3. Selecting a Suitable Tank Location

Tank positioning affects water pressure, pipe length, structural requirements, maintenance access, and the operation of the pump.

A tank installed at ground level may require a separate pressure pump to distribute water effectively. An elevated tank can provide gravity-fed pressure, although the available pressure depends on the vertical height of the water above the outlet and the losses in the pipework.

Before installation, assess:

The strength and stability of the supporting surface or tower.
The weight of the tank when completely full.
Access for filling, inspection, and cleaning.
The distance between the borehole, tank, and distribution points.
The routing and protection of water pipes.
Drainage and overflow arrangements.
The safety of ladders, platforms, and elevated structures.

A full tank can impose a substantial load on its foundation. Tank towers and elevated platforms should be designed for the intended load and site conditions, not assembled on an unverified support.

4. Borehole Pump and Storage Tank Integration

The borehole pump must be compatible with the tank's filling requirements and the borehole's available water supply.

The design should account for the pump's flow rate, total dynamic head, delivery pipe size, electrical supply, and expected operating period.

If the pump delivers water too quickly for the borehole to sustain, the pumping water level may fall and activate dry-run protection. If the pump is too small for the required filling schedule, the tank may not recover quickly enough to meet demand.

The correct solution may involve adjusting the pumping schedule, improving storage capacity, selecting a suitable pump, or investigating the borehole's yield.

Pump selection should be based on the actual hydraulic duty rather than horsepower or borehole depth alone.

5. Automatic Tank-Level Control

Automatic tank-level control allows the pump to respond to the amount of water stored in the tank.

Depending on the system design, control may use float switches, level electrodes, electronic level sensors, or a dedicated controller. The control circuit can stop the borehole pump when the tank reaches its upper operating level and request pumping when the water falls to a lower level.

A properly configured system should include suitable switching logic and protection against inappropriate operation. The exact arrangement depends on the pump, tank, borehole conditions, and electrical control panel.

The upper and lower control levels should be set with sufficient separation to prevent rapid start-stop cycling. Where applicable, minimum run times, restart delays, and motor protection may also be required.

Automatic controls should be tested to confirm that the pump starts and stops at the intended levels.

6. Preventing Tank Overflow

Overflow can waste water, damage property, erode soil, or create unsafe conditions around a tank foundation.

A tank-level control should be designed to stop filling at the appropriate level. An overflow outlet should also be provided where required by the tank design, with adequate capacity and safe discharge routing.

Do not rely on a single sensor without considering the consequences of its failure. Depending on the installation, an independent high-level alarm or additional protective control may be appropriate.

During commissioning, test the level-control sequence and confirm that overflow water, if any, is directed away from buildings, electrical equipment, foundations, and walkways.

7. Protecting the Borehole Against Dry Running

Dry running occurs when a pump operates without sufficient water available for safe operation. It can damage the pump and reduce equipment service life.

A low-water protection system may monitor water level directly or use an appropriate electrical or electronic detection method. Some installations also use timed shutdown and recovery delays, depending on the equipment design.

When dry-run protection activates, investigate the reason before restarting the pump. Potential causes include:

Falling pumping water level.
Inadequate borehole yield.
A faulty level sensor or control circuit.
Incorrect protection settings.
A damaged cable or sensor connection.
Changes in groundwater availability.

Protection settings must be compatible with the pump and borehole conditions. Do not bypass the protective function simply to keep water flowing.

8. Pipework Between the Borehole and Storage Tank

The delivery pipe must withstand the expected pressure and operating conditions. Its diameter influences friction losses and the flow delivered to the tank.

An undersized pipe can increase friction losses and reduce the system's effective performance. A damaged or leaking pipe can waste water and prevent the tank from filling as expected.

During installation, assess the pipe material, pressure rating, joint compatibility, route, supports, and exposure to physical damage. Use appropriate fittings and valves for the application.

Where pipes run underground, consider protection against external damage and provide suitable access for inspection or repair where practical.

After installation, check the system for leaks and confirm that the delivered flow is consistent with the intended operating conditions.

9. Pressure Pumps and Distribution Systems

A storage tank does not always provide enough pressure for every property. Buildings with multiple floors, long pipe runs, showers, irrigation equipment, or commercial fixtures may require a separate pressure-boosting system.

A pressure pump should be selected according to the required flow, total head, fixture demand, and distribution arrangement.

Possible control methods include pressure switches, pressure transducers, pressure vessels, and variable-frequency drives. The appropriate combination depends on the system design.

Where a pressure vessel is used, its size and pre-charge should match the pump control arrangement and manufacturer's instructions. Incorrect settings can contribute to frequent cycling or unstable pressure.

The borehole pump and the distribution booster perform different functions in many installations. They should be designed as a coordinated system without assuming that one pump can meet every requirement.

10. Electrical Controls and Pump Automation

Automatic operation depends on reliable electrical controls. The control panel may include a motor starter, contactor, overload relay, circuit protection, level-control inputs, and status indicators.

Depending on the installation, additional protection may be needed against phase failure, abnormal voltage, overload, short circuits, and dry running.

The control panel should be suitable for the environment and protected against moisture, dust, and unauthorised access as required by the installation.

Electrical installation, testing, and repair should be performed by a suitably qualified person. Before opening the panel, isolate the supply and verify that the equipment is de-energised.

The system should be tested to ensure that automatic controls cannot repeatedly start the pump under unsafe conditions.

11. Testing the Complete Storage and Automation System

After installation, test the entire water supply system rather than checking only the pump.

Commissioning may include:

Inspecting the tank support and installation.
Checking the delivery pipework and valves.
Verifying electrical connections and protective devices.
Testing the tank's low-level and high-level control sequence.
Confirming that the pump stops at the intended upper level.
Verifying that the pump restarts at the intended lower level.
Checking for leaks and unexpected pressure losses.
Confirming that overflow arrangements discharge safely.
Measuring flow and pressure where appropriate.
Observing pump operation and recording relevant readings.

The borehole's pumping water level should also be monitored where practical, particularly if the system has experienced low-water trips or changes in output.

If the pump fails to deliver water, runs continuously, or repeatedly trips, stop and investigate the cause rather than allowing the system to continue operating abnormally.

12. Maintenance of Storage Tanks and Automatic Controls

Preventive maintenance helps keep the system operating reliably.

Tank inspections should follow the tank manufacturer's recommendations and the site's water-quality requirements. Where water is used for domestic purposes, cleaning and hygiene practices should be appropriate for potable-water storage.

Maintenance may include checking the tank cover, inlet and outlet fittings, overflow, drain, level sensors, control wiring, valves, and accessible pipework.

Test automatic controls periodically and investigate unexplained changes in pump run time. A tank that takes much longer to fill may indicate a falling borehole water level, a pump problem, a leaking pipe, or a control fault.

Maintain records of pump operating hours, tank filling times, water demand, faults, and repairs. These records help identify performance changes before a major interruption occurs.

13. Water Storage Solutions for Different Properties

Homes: Storage capacity should reflect household demand, available space, and the desired reserve during supply interruptions.

Apartment buildings: The design should consider the number of occupants, peak consumption, distribution pressure, tank capacity, and access for maintenance.

Schools and institutions: Tank capacity and control arrangements should reflect operating hours, daily water use, and the need to replenish supplies during periods of demand.

Farms: Storage can help coordinate borehole pumping with irrigation schedules, provided the borehole's sustainable yield is respected.

Commercial facilities: The system may require larger storage volumes, monitoring, alarms, and controls suited to operating schedules and water demand.

Every installation should be assessed individually because tank capacity, pump size, pressure requirements, and automation settings depend on the site's conditions.

Frequently Asked Questions

How do I choose a water tank for my borehole?

Estimate daily water demand, desired reserve, available pumping hours, borehole yield, and available installation space. Confirm the structural support and tank's usable capacity before selecting a model.

Can a float switch control a borehole pump automatically?

Yes, where the float switch is suitable for the tank and control circuit. It must be correctly installed and integrated with the pump's electrical protection and control logic.

Why does my borehole pump keep filling the tank slowly?

Possible causes include a reduced pumping water level, pump wear, pipe restrictions, leakage, an unsuitable pump, or a control problem. Flow and water-level measurements can help identify the cause.

Can I use a separate pump to increase water pressure?

Yes, a suitable pressure booster may be installed where the storage arrangement does not provide sufficient pressure. The booster should be selected according to the required flow, head, and distribution design.

How can I prevent a water tank from overflowing?

Use correctly configured level controls and provide a suitable overflow arrangement. Depending on the consequences of failure, an independent high-level alarm or additional protection may also be appropriate.

Does a large storage tank solve low borehole yield?

A larger tank can provide more storage over time, but it does not increase groundwater availability. The pumping schedule and storage capacity must remain compatible with the borehole's sustainable yield.

Contact Pro-Logic Technologies Limited

For borehole water storage planning, tank-level automation, pump control troubleshooting, pipework assessment, and system testing, contact Pro-Logic Technologies Limited.

Phone: 0723763173
Website: https://prologictecnologies.co.ke

When requesting an assessment, provide the borehole depth, available pumping water-level information, pump rating, tank capacity, estimated water demand, and details of any existing automation.

A reliable water storage system combines suitable tank capacity, correctly selected pumps, safe electrical controls, and tested automatic operation.