The current approach is to improve the instrumentation on service networks and identify where the flows are greater than theoretical predictions, indicating leakage as well as improved response to reported surface leaks but repair of one leak on an aged system often results in the water finding the next weak spot.
Water is an undervalued resource and fantastically good value at under £1 per cu metre. How much would a similar amount of the bottled variety cost?
Results 31 to 40 of 186
13-04-12, 17:30 #31
13-04-12, 17:36 #32Registered User
Location : Manchester, UK
- Join Date
- Dec 2006
13-04-12, 17:44 #33
Whatever is or was a gas-pig?!
Ghostlymoron, as a professional, your view must be of considerable significance here...
...is it likely to be a worthwhile benefit, if homeowners use the contents of rain-waterbutts (or seawater if available), to flush loos?
If dedicated cistern-tanks sat in attics, and were filled by rain (or pumped full from the sea), mightn't we reduce drinking water wastage?
13-04-12, 17:53 #34
13-04-12, 18:18 #35
Mega joules? Okay. I said at the start, I was out of my depth.
Does your calculation imply that 340 watts would be sufficient power to elevate 100 tonnes through 5 meters, during the 6 hours of a rising tide? I'd have imagined more would be needed, and that conversely, more could be extracted, by that weight descending.
If a platform raised 100 tonnes of water every twelve hours, and then, that water then poured back through a fairly traditional water-mill-wheel, turning a dynamo, would it only generate a third of a kw?
Presumably the benefit would be that it needn't be limited to 100 tonnes, and wouldn't rely on any energy input, and wouldn't vary in its output, because (aside from differing neaps and springs) lunar activity isn't inconsistent in the way wind and solar are.
13-04-12, 18:34 #36
Coincidently I have a 335Watt pump which quotes 140L/min at 5Mtr head
To pump 10 tonnes would take 11 hours or approx 50% efficency which is very good .
These things have to be scaled v large to make ecconomic sense.
There was talk of daming the severn estuary and generating power doing exactly what you are suggesting
13-04-12, 18:42 #37
I hope your Severn idea wasn't a joke? I reckon it's excellent good sense!
I suppose my earlier idea (and you've confirmed the slow thoughts I had, since) is equivalent to a 10m x 5m x 2m swimming pool being filled from a point 5 meters below...
...that would only require a Rule 3600gph bilge pump, running at maximum capacity for 6.5 hours. Sounds entirely possible, and as you say, not a huge amount of power is required or recoverable, for lifting/dropping that quantity.
But presumably it would be possible, using what in effect would be a 'tidal-pump', to fill a reservoir ashore, (ideally well above ground level, for greater pressure)...
...not pretty, but an asset, if at a moment's notice, you can let thousands of tonnes of brine pour back to the sea, driving very big dynamos as it goes? Just like a hydro-electric dam, but without waiting for rain to fill the lake.
13-04-12, 18:46 #38
13-04-12, 18:57 #39
There's a windfarm-theme on the forum at the moment, about the IoW/Dorset coast site. I'd thought only of the disagreeable view, and the possible inconvenience to mariners...but right here and now, I hope it will go ahead.
13-04-12, 20:57 #40
Pigging (they can't touch for it) is difficult in street water mains where the majority of leaks occur due to the number of service connections. I don't know whether this technique is used by water companies.