Cistern parts are critical components that work together to store and manage water, ensuring a reliable water supply and proper system operation. Understanding each part’s function helps with maintenance and troubleshooting, making your water system more efficient and durable.
Have you ever wondered what makes a water cistern system tick? Many homeowners are curious about the various parts involved in storing water, especially if they rely on a well or rainwater harvesting. It can seem a bit technical at first, but understanding the key components is easier than you think! This guide will break down each cistern part and explain exactly what it does. We’ll make it simple, so you can feel confident. Ready to discover the essential construction functions of your cistern system? Let’s dive in!
What is a Cistern and Why is it Important?
A cistern is essentially a watertight tank used to store water. This water can come from various sources, such as rainwater collected from rooftops, spring water, or water from a well. The primary purpose of a cistern is to provide a reserve of water for household use, especially in areas where a consistent municipal water supply might be unreliable or unavailable. They play a crucial role in:
- Water Security: Ensuring you have water during droughts, power outages, or periods when your primary water source is compromised.
- Rainwater Harvesting: A sustainable way to utilize natural rainfall for non-potable uses like irrigation, toilet flushing, and laundry, reducing reliance on treated water.
- Pressure Stabilization: In some systems, cisterns can help maintain consistent water pressure.
- Water Quality Management: When properly designed and maintained, cisterns can help filter and settle impurities before water is used.
For DIY enthusiasts and homeowners, understanding these systems is a valuable skill. It empowers you to perform basic maintenance, identify potential issues early, and ensure your water supply remains safe and functional. Let’s explore the individual parts that make this vital system work.
Key Cistern Parts and Their Construction Functions
A cistern system is composed of several interconnected parts, each with a specific role. Here’s a breakdown of the most common and essential cistern parts:
1. The Cistern Tank
This is the heart of the system – the storage container itself. Cistern tanks can be made from various materials, each with its own pros and cons:
- Concrete: Durable and long-lasting, often buried underground. They can be pre-cast or poured on-site. Their mass provides excellent thermal stability.Learn more about concrete cisterns and their construction.
- Fiberglass: Lightweight, corrosion-resistant, and easy to install. They are often used for above-ground installations or when underground installation is complex.
- Plastic (Polyethylene): Affordable, lightweight, and available in various sizes. They are a popular choice for DIY installations due to ease of handling and lower cost. Ensure they are rated for potable water if that’s the intended use.
- Steel: Strong and durable, often used for larger industrial or agricultural applications. They require corrosion protection.
Construction Function: The primary function of the cistern tank is to safely and securely hold a significant volume of water. Its design and material must be robust enough to withstand external pressures (if buried), internal water pressure, and environmental conditions. It must be watertight to prevent leaks and contamination.
2. Inlet Pipe and Screen
The inlet pipe is where the water enters the cistern from its source (rain gutters, well pump, etc.). Often, a screen or filter is attached to the inlet to prevent large debris, leaves, twigs, and other unwanted materials from entering the tank.
Construction Function: To channel water into the cistern. The screen’s function is crucial for protecting the cistern’s contents and subsequent parts of the water system from clogging and contamination by coarse sediment and organic matter. It’s the first line of defense for water quality.
3. Overflow Pipe and Screen
When the cistern is full and no more water can be stored, the excess water needs a way to exit. This is the role of the overflow pipe. Like the inlet, it’s usually fitted with a screen to prevent pests or debris from entering the tank through this opening.
Construction Function: To safely discharge excess water from the cistern when it reaches capacity, preventing the tank from overflowing in an uncontrolled manner, which could cause erosion or water damage around the tank site. It also acts as an emergency vent.
4. Outlet Pipe and Strainer
This pipe draws water out of the cistern for use. It’s typically positioned a few inches above the bottom of the tank to avoid drawing sediment that may have settled there. A strainer (a finer mesh than the inlet/overflow screens) is often attached to prevent smaller debris from entering the system and potentially damaging pumps or fixtures.
Construction Function: To supply water from the cistern to the household or irrigation system. The placement and strainer ensure cleaner water is drawn, protecting downstream equipment.
5. Access Hatch or Manhole
This is an opening on the top of the cistern, sealed with a lid, that allows for inspection, cleaning, and maintenance of the tank’s interior. It’s essential for servicing the cistern.
Construction Function: To provide safe and convenient access to the interior of the cistern for cleaning, repairs, and inspections. It is typically designed to be secure and watertight when closed.
6. Vent
A vent allows air to enter or exit the cistern as water levels change. Without a vent, a vacuum could form as water is drawn out, or pressure could build up as water enters, potentially damaging the tank or affecting water flow. Vents are often positioned at the highest point of the system.
Construction Function: To equalize pressure within the cistern, allowing for smooth water flow in and out and preventing structural damage to the tank due to pressure differentials. It also prevents the creation of a vacuum that could stop pumps.
7. Sump or Sediment Trap
Some cistern designs incorporate a sump, a lower section or a specific area designed to collect the sediment that settles out of the stored water over time. This keeps the main body of the cistern cleaner.
Construction Function: To concentrate sediment in a specific, easily accessible area for more efficient cleaning and to keep the bulk of the stored water free from accumulated solids.
8. Water Level Indicator
While not always a physical “part” in the traditional sense, a mechanism to indicate the water level inside the cistern is very helpful. This can range from a simple dipstick to more advanced electronic sensors that display the water level on a gauge inside the home.
Construction Function: To inform the user about the amount of water available in the cistern, aiding in water management and preventing the system from running dry unexpectedly.
9. Pump (if applicable)
If the cistern is storing water below the level of use (e.g., underground cistern supplying an above-ground house), a pump is essential to move the water. This could be a submersible pump placed inside the cistern or a jet pump located outside.
Construction Function: To provide the necessary pressure to move water from the cistern to the point of use in the building or irrigation system.
10. Pressure Tank and Pressure Switch (typically used with a well pump system)
While not strictly part of the cistern itself, these are often integrated into a cistern water system if a pump is used. The pressure tank stores water under pressure and the pressure switch tells the pump when to turn on and off to maintain a set pressure range.
Construction Function: The pressure tank cushions the system, preventing the pump from short-cycling (turning on and off too frequently). The pressure switch automates the pump’s operation, maintaining consistent water pressure and saving energy.
Table: Cistern Part Function Summary
To help you quickly reference the purpose of each component, here’s a summary table:
| Cistern Part | Primary Construction Function |
|---|---|
| Cistern Tank | Securely stores water without leaks. |
| Inlet Pipe & Screen | Channels water in, screens out large debris. |
| Overflow Pipe & Screen | Safely discharges excess water, screens out pests/debris. |
| Outlet Pipe & Strainer | Supplies water out, strains out smaller debris. |
| Access Hatch/Manhole | Provides access for maintenance and cleaning. |
| Vent | Equalizes air pressure for consistent water flow. |
| Sump/Sediment Trap | Collects settled sediment for easier cleaning. |
| Water Level Indicator | Monitors available water volume. |
| Pump (if used) | Moves water from cistern to point of use. |
| Pressure Tank & Switch (if used) | Maintains water pressure and automates pump operation. |
Installation Considerations
The proper installation of these parts is as crucial as their function. For underground cisterns, proper excavation, base preparation, and backfilling are essential to prevent collapse or damage. For rainwater harvesting systems, the pitch of the roof and the downspouts leading to the inlet are important for efficient collection. Ensuring all connections are watertight and all screens are securely fastened is paramount for a reliable and healthy water system.
Consider the following during installation:
- Location: Choose a stable, accessible location. For buried tanks, consider drainage and structural integrity of the soil.
- Material Compatibility: Ensure materials used are safe for potable water if that’s the intended use.
- Protection from Contaminants: Design the inlet and overflow to prevent entry of pests, debris, and surface runoff.
- Access for Maintenance: Make sure the access hatch is easily reachable for routine checks and cleaning.
- Freeze Protection: In colder climates, ensure components are protected from freezing. This might involve burying the tank below the frost line or insulating exposed parts.
When in doubt, consult local building codes and consider professional installation, especially for underground tanks or complex systems. Resources like the EPA’s guide to rainwater harvesting can provide valuable insights.
Maintenance of Cistern Parts
Regular maintenance is key to ensuring your cistern system functions reliably for years to come. Here’s what you should typically check:
Regular Inspections (Monthly/Quarterly)
- Check Inlet and Overflow Screens: Ensure they are clear of debris and pests. Clean or replace as needed.
- Inspect Visible Pipework: Look for any signs of leaks, damage, or corrosion.
- Test Water Level Indicator: Make sure it’s providing an accurate reading.
- Listen for Unusual Noises: Gurgling or sucking sounds might indicate pressure issues or a partially blocked vent.
Periodic Servicing (Annually/Bi-Annually)
- Assess Water Clarity: Noticeable cloudiness or odor can indicate a need for cleaning or deeper inspection.
- Inspect Tank Interior (via Access Hatch): Look for sediment build-up, cracks, or leaks.
- Check Pump Operation (if applicable): Listen to the pump and check for smooth operation.
- Flush the System: Some systems benefit from periodic flushing to remove stagnant water.
Deep Cleaning (Every 3-5 Years, or as needed)
This is where the sump or sediment trap plays its role. Depending on the build-up:
- Empty the Cistern: This can be done using a pump or by opening the drain (if equipped).
- Remove Sediment: Clean out the accumulated sludge from the bottom and any sump area.
- Inspect Tank Walls: Look for any structural issues or significant leaks.
- Clean Inlet, Outlet, and Overflow Pipes: Ensure no blockages remain.
- Disinfect (if necessary): If water quality is a concern, a mild disinfectant solution can be used, followed by thorough rinsing. Consult water quality guidelines from your local health department.
- Refill the Cistern.
Safety Note: When entering a cistern, always ensure it is properly ventilated and never enter alone. Confined spaces can be dangerous due to potential oxygen depletion or hazardous gases. If you are unsure, hire a professional.
Troubleshooting Common Cistern Issues
Even with good maintenance, problems can arise. Here’s how to tackle a few common issues:
- Low Water Pressure:
- Check if the cistern is low on water.
- Ensure the outlet strainer is not clogged.
- Verify the pump is operating correctly (if used).
- Check for leaks in the plumbing lines after the cistern.
- Water Odor or Taste Issues:
- Clean the inlet screen and the tank itself.
- Ensure the overflow and vent screens are intact to prevent pests or debris from entering.
- Check for any potential contamination sources near the cistern.
- Consider your water source – is it contributing to the issue?
- Pump Not Running:
- Check the power supply and circuit breaker.
- Ensure the water level is sufficient for the pump to operate.
- Inspect for blockages in the pump intake.
- The pressure switch might need adjustment or replacement.
- Cistern Not Filling:
- Check the inlet pipe for blockages.
- Ensure the water source is active.
- If it’s a rainwater system, check for roof or gutter obstructions.
For more complex issues, consulting a plumbing professional or a water systems specialist is always recommended.
Conclusion
Understanding the diverse parts of a cistern system and their essential construction functions is a rewarding journey for any homeowner or DIY enthusiast. From the robust tank that holds your precious water reserve to the vigilant screens that keep debris out and the essential vent that maintains balance, each component plays a vital role. By familiarizing yourself with these parts, you gain the confidence to perform routine maintenance, troubleshoot minor issues, and ensure your water system remains a reliable and efficient asset to your home. Remember, proper installation and regular care are the cornerstones of a long-lasting and dependable cistern sy
