Electric Shower Low Water Pressure.

Its a nice idea, but if it is anything like seaside places I have stayed at, I suspect there is no appetite to either spend much money or limit the "customer experience. " The real solution would have involved putting in fat enough pipes to deal with a bit of load creep from the outset. It is far too late ;-) 

Swapping the stop cock for a full-flow ball valve may increase the flow a bit relative to a 'tap' type of thing, but it is  not a big effect, the problem will be 10s of metres of 15m pipe, that should have been 50mm or larger.

when we do things like the taps at the jamboree camps we borrow techniques from the simplified designs recommended in 3rd world countries.  leads to a bit of a mis-sized design, but is quick and adequate.

example

And lots of normal design rules are irrelevant as it will all be rolled up and taken away after a few weeks. It just needs to be safe from an environmental health perspective.
Note that pipe resistance is not very like ohms law, it is non-linear, or the resistance is current dependent if you like.

The Hazen Williams approximation is commonly used for simple clean water pipe runs.

The coefficient C is perhaps 100-120 for a rough concrete pipe and 150 for a smooth bore plastic one.
The two killer facts are that the pressure drop rises almost as the square of the flow rate, so to double the flow in the same pipe almost quadruples the pressure drop;  and is divided by almost the 5th power of pipe diameter, so doubling pipe diameter gives you ~ something like 26 times the volume per minute for a given pressure drop.

The counterpart for wastewater would be
simplified sewage  less use on a camp but still OK for inspiration for initial estimates of pipe sizes to portacabin toilet blocks etc.
(think of a scout Jamboree with 20 thousand scouts...)

Mike

Its a nice idea, but if it is anything like seaside places I have stayed at, I suspect there is no appetite to either spend much money or limit the "customer experience. " The real solution would have involved putting in fat enough pipes to deal with a bit of load creep from the outset. It is far too late ;-) 

Swapping the stop cock for a full-flow ball valve may increase the flow a bit relative to a 'tap' type of thing, but it is  not a big effect, the problem will be 10s of metres of 15m pipe, that should have been 50mm or larger.

when we do things like the taps at the jamboree camps we borrow techniques from the simplified designs recommended in 3rd world countries.  leads to a bit of a mis-sized design, but is quick and adequate.

example

And lots of normal design rules are irrelevant as it will all be rolled up and taken away after a few weeks. It just needs to be safe from an environmental health perspective.
Note that pipe resistance is not very like ohms law, it is non-linear, or the resistance is current dependent if you like.

The Hazen Williams approximation is commonly used for simple clean water pipe runs.

The coefficient C is perhaps 100-120 for a rough concrete pipe and 150 for a smooth bore plastic one.
The two killer facts are that the pressure drop rises almost as the square of the flow rate, so to double the flow in the same pipe almost quadruples the pressure drop;  and is divided by almost the 5th power of pipe diameter, so doubling pipe diameter gives you ~ something like 26 times the volume per minute for a given pressure drop.

The counterpart for wastewater would be
simplified sewage  less use on a camp but still OK for inspiration for initial estimates of pipe sizes to portacabin toilet blocks etc.
(think of a scout Jamboree with 20 thousand scouts...)

Mike