A stock-water system has to do more than hold water. It has to keep enough water available for the animals on the property, refill at a useful rate, and keep doing that when conditions are hot or the supply is interrupted.

There is no single tank, trough or pump size that suits every property. A useful starting point is to work through four questions in order: how much water the stock may need, how much storage buffer you want, whether the trough can keep up with demand, and what role the pump and pipe system need to perform.

How much water do cattle need each day?

Water intake changes significantly with animal size, class, lactation, feed moisture, water quality and weather. Queensland FutureBeef material shows why a single litres-per-head figure should only ever be treated as a planning guide. A dry cow that may drink around 40 litres at about 25°C may move toward 70 litres at around 32°C, and lactating cows can require roughly 30% more than dry cows.

The practical point is simple: plan from a guide that fits the class of stock and then allow for the conditions your property actually experiences. Do not size a system around a mild-weather average if the real risk is a hot summer day.

A simple storage calculation

Once you have selected a sensible daily planning figure, the arithmetic is straightforward:

head count × litres per head per day × chosen buffer period = nominal storage requirement

For example, if 50 head are planned using an illustrative figure of 80 litres per head per day, the mob represents about 4,000 litres of daily demand. If the property owner chooses to plan around a three-day interruption to the normal refill supply, that example would represent about 12,000 litres of nominal buffer storage.

The 80 litres per head per day and the three-day buffer in that example are illustrative planning inputs, not TGRM recommendations. Select a daily guide figure that matches your stock class and conditions from current government or industry guidance. The right buffer depends on the reliability of your refill source, how quickly a breakdown can be repaired, seasonal risk, how remote the watering point is, and how much risk you are prepared to carry. Some properties may want more reserve; others with highly reliable supply may choose less.

Tank size is only one part of the system

A larger tank can provide more reserve, but storage does not fix a poor refill system. If the incoming water source cannot replace what the stock are using, the tank is still being drawn down.

TGRM carries stock-water products across tanks and troughs, fittings, valves, pumps and poly pipe. The useful question is not simply "what size tank should I buy?" but "what job does the storage need to do in this system?"

For example, a tank may be used as:

• a buffer between a bore, dam, rainwater source or pumped supply and the trough network;
• reserve capacity if a pump, pipe or supply source stops temporarily;
• a way to separate slow source replenishment from short periods of heavy stock demand.

Current TGRM examples include dedicated livestock troughs and integrated tank-and-trough systems, but the right product still depends on the demand and refill conditions at the property.

How big should the trough be?

Trough capacity matters, but refill rate matters just as much. A large trough with a very slow inlet can still run low when a mob arrives together. A smaller trough with strong replenishment may recover quickly enough for the way that particular mob drinks.

When assessing a watering point, consider:

• mob size and class of stock;
• likely peak demand in hot weather;
• how many animals may arrive at the trough together;
• how quickly the trough refills after a drinking event;
• the capacity of the supply line, float valve and upstream storage;
• whether there are multiple watering points or only one;
• the distance and elevation between the source, storage and trough.

There are useful numeric rules for some specialised systems such as containment areas, but they should not be copied across to every open-paddock trough. For a normal property system, the safer approach is to check the whole supply path rather than rely on a generic litres-per-head trough rule.

What sort of pump do I need?

Start with the job the pump has to perform rather than the horsepower number on the box.

A transfer pump moves water from one place to another — for example from a source to a tank or trough. A submersible pump operates down in the water source or sump. A pressure pump is used where a reticulated system needs adequate pressure across pipework and outlets. General-purpose or firefighting pumps can move substantial water, but that does not automatically make them the correct choice for a stock-water network.

Exact pump sizing needs more information than cattle numbers. Static head, elevation change, pipe size and length, friction loss, required flow and the pump's own performance curve all matter. For that reason, TGRM can help identify the type of pump and the products in the range, but a specific system should be sized from the actual property details rather than from a generic "X head = Y pump" rule.

Do not forget the pipe system

Once storage, trough and pump roles are understood, the pipe system has to carry the required water between them. Pipe family, diameter, pressure requirement, run length and fittings all affect the result.

TGRM's separate guide on Green Stripe Rural Poly versus Blue Line metric poly explains the product-family choice. Check that guide for pipe-system selection.

Keeping the trough working reliably

The watering point itself deserves attention as well as the tank, pump and pipe. A failed or restricted float valve can reduce refill performance even when the rest of the system is capable of supplying enough water.

TGRM carries Cocky Valve trough float valves. Cocky Valve states that its stainless-steel valves are designed for high flow and backs its products with a limited lifetime warranty against defects and breakage, subject to its warranty conditions and correct selection, installation and operation. For a stock-water system where refill reliability matters, a quality float valve is not a minor component — it is part of the water-delivery system.

Keeping trough water clean is another practical consideration. TGRM stocks copper-based trough blocks designed to control algae and slime in stock troughs. These products must be used according to their own directions and restraints: copper is being added to the stock water, and copper toxicity is a well-documented, product-specific risk for sheep in particular — some copper trough blocks are not recommended for sheep at all, while others specify a sheep-safe dose rate, so this varies by product and must not be assumed. Copper trough blocks can also have trough-material restraints, including bare-metal or steel troughs on some products. Check the exact product label for species suitability, dose rate, trough material and any existing copper exposure before use.

Are you using the trough for Beachport Liquid Minerals?

The trough can also be used as the delivery point for some livestock supplements. TGRM carries Beachport Liquid Minerals, and the Beachport Dispenser is specifically designed to meter Beachport products through a water trough over approximately 48–72 hours.

If Beachport is being used, follow Beachport's product-selection and dose directions rather than using the stock-water calculations in this guide as supplement-dosing instructions. Beachport also states that its products must not be mixed with other products in the water supply. Importantly, if a copper trough block is being used for algae control, Beachport directs users to remove the copper block before dosing Beachport and return it 4–5 days after the Beachport drum has been removed.

As TGRM expands its Beachport range, ask the team which Beachport product and dispenser setup suits the livestock and the purpose of supplementation, then follow the manufacturer's current dosing and application guidance.

A practical planning sequence

For a new or upgraded stock-water system, work through the job in this order:

1. Count the stock and choose a realistic daily water-demand guide for the animal class and conditions.
2. Decide how much interruption or supply risk you personally want the storage to cover.
3. Check that trough capacity and refill performance work together for the mob using that watering point.
4. Identify the pump role — transfer, submersible, pressure or another application — before trying to choose a model.
5. Check the pipe system can move the required water over the actual distance and elevation.
6. If the system involves significant head, long pipe runs, uncertain bore/dam yield, drought-security planning or complex hydraulics, get the relevant specialist involved before buying components.

Where TGRM fits

TGRM carries a broad rural water-supply range including tanks, troughs, pumps, fittings, valves and poly pipe. Bring in the number and class of stock, the water source, approximate distances and elevation changes, existing pipe sizes and what you are trying to improve. That gives the team enough information to help narrow the product choices and identify where more detailed hydraulic or pump sizing is needed.

This guide is intended to help with planning and product selection. It is not a hydraulic design, dam/catchment calculation or drought-security guarantee. Livestock water requirements vary with conditions, so use current government/industry guidance and the real conditions on your property when making final decisions.