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flow and return
Return flow is surface and subsurface water that leaves the field following application of irrigation water. While irrigation return flows are point sources, in the United States they are expressly exempted from discharge permit requirements under the Clean Water Act.Return flows generally return to the irrigation centre after a period of about three to four weeks; due to this, the farmers usually need to pour bleach into the water to clean it of any organisms that have entered the stream. If this is not taken care of, diseases such as typhoid or cholera could enter the irrigation and pose a risk of epidemic disease to surrounding towns and cities.
The return flows in irrigation is nearly 50% of the water supplied in silty clay soil type in tropical countries. The salinity of the return flow water increases with decrease in % of return flow quantity. Rest of the water supplied to irrigation evaporates to atmosphere due to evapotranspiration.
When ground water is extracted for irrigation and other uses, most of the return flows seep back into the ground instead of joining the nearby surface stream. When ground water is used in excess of recharge from rainfall/precipitation, the quality of groundwater deteriorates over a period of time and becomes unfit for irrigation use.
Hello, first post looking fore some help please.
I am having a garage conversion and have had four quotes from very reputable companies. All have said adding one radiator to an exisiting system is never an issue, some have done over 400 jobs and never been a problem. When I have said thought...
HORNETUK
Thread
adding
boiler
flowflowandreturn
house
never
output
radiator
return
Hi Everybody, new to forum with probably a daft question but I simply cannot get my head around this. We are building an extension and currently putting in the flow & return pipes for the central heating. My question is: can the 22mm flow and return pipe upstairs be split with a 'T' to go to...
Hi,
I have noticed that the suprima 30 kw boiler has 22 mm coming out of the top, but the plumber when connected to it increased the pipe size to 28mm pipe?
Im just wondering why didnt the manuracturer just have 28mm coming out in the first place?
Are there any other boilers where this...
Hi I found this forum and wanted to ask a few question in regards to my central heating.
I have recently had central heating fitted in a first floor two bedroom flat. There are 6 radiators with plastic pipe work running through the roof space and coming down in copper with three drops (two...
cjonesguitar
Thread
air
boiler
boilers
combi
combi boiler
copper
fix
flowflowandreturn
head
hot
noise
pipes
piping
radiator
return
system
temperature
thermostatic
thermostatic valves
trv
vaillant
valves
wall
work
ok, looking for new ways to play with.
can anyone describe to me how you use those bungs so you can change a t.r.v without draining down by putting the system into suspension and are they any good 100% of the time?
thanks.
REDSAW
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air
bleed
cold
drain
flowflowandreturn
hose
inside
insurance
jobs
merchant
pipe
plumbers
problem
rad valve
return
seal
system
tank
tools
trv
valve
valves
vent
water
work
I have gone through a lot of vokera valiant raven heat etc… websites and I maybe I have missed it but I just couldn’t find anything regarding flow and return temps for condensing LPG boilers
At the moment I'm sizing radiators up my new house, I just wanted to know the flow and return...
shraheens
Thread
black
boiler
boilers
cheap
condensing
copper
fed
find
flowflowandreturn
keston
lpg
oil
radiators
return
tank
temperatures
thank you
valiant
vokera
wanted
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