subject: Rainwater Could Save Equestrian Centres Money [print this page] There are a lot of equestrian centre and livery yard owners who are shocked by the size of their water bills. This article explains how these can be decreased.
Maybe you run a yard or a riding stable. Maybe you are lucky enough to have horses at home. Either way, you know how much water horses use. Yet from your stable roofs, or barn roof, or house roof, you could be storing litres and litres of rainwater to use instead of expensive mains water.
The horse has a pulled tendon or ligament. The vet says to hose the injured leg for 20 mins to half an hour every day. That is the same as 3 baths or a minimum of 300 litres. Or a 20 minute shower. Then theres the drinking water: a horse drinks 40 to 60 litres a day. And washing the feed buckets, hosing down the yard, cleaning off muddy legs not to mention shampooing and rinsing the whole horse, soaking the hay. And theres the yard WC being used all day long by clients and staff (eg 30 flushes a day = @ 180 litres). They may even be a washing machine for dirty numnahs and bandages. Theres the arena to water: perhaps the sprinkler is on for an hour or two: thats another 1000 to 2000 litres. There are a multitude of jobs that all use water. For a yard with 10 horses, you could be using around 2000 litres a day.
All those uses listed above could be supplied with rainwater. As stables, barns and indoor schools have a large roof area, enough rainwater can be collected and stored for everything that does not need mains water (drinking quality water).
The initial choice is between above or below ground storage tanks. Above ground tanks are cheaper to install as there is not the cost of digging a hole as there is for underground tanks. However, underground tanks are to be recommended as the stored water stays fresh and cool if not above ground (bacteria do not form in temperatures under 12 C) so horses will drink it more readily. It makes sense to put the tank underground, since sometimes space is very limited.
The location of the tank should be in the best position to collect the rainwater from the downpipes. The rainwater is cleaned, either by a filter in the downpipe, or more normally, by a filter in the tank itself. These filters require very little maintenance and remove enough debris to make the water quite suitable for all those uses that don't need human drinking--quality water.
A pump inside the storage tank takes the rainwater to where ever it is needed. The type of pump normally used can deliver up to 5 bar (household pressure is around 2.5-3.0 bar) or over 3000 litres an hour. It can pump water up to a 45 metre head, so is certainly strong enough, for example, to water an arena. If connected to a hose or tap, the pump will automatically start to pump water when the tap or hose is turned on.
Another essential feature needed is a reliable mains back up that will switch automatically to mains water if the storage tank runs out.
Your rainwater system supplier does a tank size calculation for you, depending on the average rainfall in your part of the country, the roof area, and what the rainwater will be used for. The cost will be less in the context of a new construction when a digger and plumber may well be on site already, typically 2000 to 3000. In a retrofit, there will be additional installation costs. Specialist installers are not required. Competent builders and plumbers should be able to do the installation quite easily. The one important current building reg to meet is to ensure there is an air gap be the rainwater and mains water pipework so there can be no cross contamination.
Normally, planning permission is not necessary. However, planners now often favour building applications that include rainwater harvesting. Official pressure is on to reduce mains water consumption on the one hand and also to alleviate flood threats. Rainwater harvesting helps with both these issues. Using some of the rainwater for constructive use means less potential flood water pouring down the drains or onto land.
If you are considering using rainwater in the yard, you may also think about using it in the house. Thirty to 40% of our domestic water literally goes down the toilet or is used by the washing machine. So nearly half of our 150 litres a day of mains water could be replaced by mains water. In the house, it is energy-efficient to use a gravity-feed system with a smart header tank (such as the Rain Director). In such a system, the rainwater is pumped to a special rainwater holding header tank, and so the energy-greedy pump in the main storage tank is activated only when the header tank is empy rather than everytime, for example, a WC is flushed. This saves 8 to 10 times on electricity use. A gravity-feed system like this would not be suitable on the yard, as there would not be enough pressure for hosing down and watering.
A quote done recently for an equestrian centre wanting to use rainwater for watering 2 arenas specified either a 13000 litre capacity for just over 4000, or to be able to rely on rainwater in a drought, 26000 litre capacity for 8400 with vat and delivery.
If you are a business, you can benefit from the Enhanced Capital Allowance scheme whereby 100% of material and installation costs of rainwater harvesting systems registered on Water Technology List can be offset against tax liability.
Rainwater harvesting is clearly an option to consider in an equestrian environment. With such high water usage, the payback on the investment will make it worthwhile in 5 or 6 years.
by: Marcus Bicknell
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