Posted by harry on March 1, 2009, 2:27 pm
On Mar 1, 3:35 am, david.willi...@bayman.org (David Williams) wrote:
> -> Had I not been an idiot when I had the pond dug i would have had a big
> -> pipe plumbed through the base of the pond with a large perferated riser
> -> that reached above the level of the pond. Then you put a float inside
> -> the riser so if the water is used up to where the pond is nearly dry the
> -> float would seal over the pipe and stop you from draining it completely
> -> ... and preserve the siphon.
> -> But like an idiot I didn't think of that when I had the pond dug, so now
> -> i'm too paranoid to dig one in with the thing full of water. It holds
> -> water so well now I figure if I break the pond down to put in the pipe
> -> i'll risk never having it hold water again :) I mean now it holds water
> -> all summer .. it kicks ass. If it ain't broke don't fix it kind of
> -> situation
> -> So it goes
> -> but the floating barrel idea .. now that one I might put into action,
> -> just don't want to dig into things too much
> -> cheers
> -> -zachary
> Well, you could just drape a flexible hose over the top of the dam and
> fill it with water so it acts as a syphon. The end in the pond could be
> attached to a float.
> dow
The trouble with the standpipe in the bottom is that the pond silts up
& the stand pipe is buried eventually. All dams eventually become
useless due to silting. There are several hydro/irrigation schemes on
the Mississippi River silted up in less than ten years & now useless.
Posted by Tim Jackson on March 1, 2009, 3:55 pm
harry wrote:
> On Mar 1, 3:35 am, david.willi...@bayman.org (David Williams) wrote:
> The trouble with the standpipe in the bottom is that the pond silts up
> & the stand pipe is buried eventually. All dams eventually become
> useless due to silting. There are several hydro/irrigation schemes on
> the Mississippi River silted up in less than ten years & now useless.
It's called dredging. You have to do it eventually, however you take
off the water. With the stand pipe, if it is on a flexible hose you can
haul it up every few months and let it drop back onto the mud.
Tim
Posted by harry on March 5, 2009, 3:18 pm
> harry wrote:
> > On Mar 1, 3:35 am, david.willi...@bayman.org (David Williams) wrote:
> > The trouble with the standpipe in the bottom is that the pond silts up
> > & the stand pipe is buried eventually. All dams eventually become
> > useless due to silting. There are several hydro/irrigation schemes on
> > the Mississippi River silted up in less than ten years & now useless.
> It's called dredging. You have to do it eventually, however you take
> off the water. With the stand pipe, if it is on a flexible hose you can
> haul it up every few months and let it drop back onto the mud.
> Tim
Not practical on the huge scales of the Mississippi dams. & where
would you dump all the dredged material?
Posted by news on March 5, 2009, 4:26 pm
On Thu, 5 Mar 2009 12:18:31 -0800 (PST), harry
>> harry wrote:
>> > On Mar 1, 3:35 am, david.willi...@bayman.org (David Williams) wrote:
>>
>> > The trouble with the standpipe in the bottom is that the pond silts up
>> > & the stand pipe is buried eventually. All dams eventually become
>> > useless due to silting. There are several hydro/irrigation schemes on
>> > the Mississippi River silted up in less than ten years & now useless.
>>
>> It's called dredging. You have to do it eventually, however you take
>> off the water. With the stand pipe, if it is on a flexible hose you can
>> haul it up every few months and let it drop back onto the mud.
>>
>> Tim
>Not practical on the huge scales of the Mississippi dams. & where
>would you dump all the dredged material?
They pump it out and build up land along the shore. Ever watched a
pump dredge with an "exhaust" pipe that's hundreds of feet long?
John
Posted by harry on March 6, 2009, 3:08 pm
On Mar 5, 9:26 pm, n...@picaxe.us wrote:
> On Thu, 5 Mar 2009 12:18:31 -0800 (PST), harry
> >> harry wrote:
> >> > On Mar 1, 3:35 am, david.willi...@bayman.org (David Williams) wrote:
> >> > The trouble with the standpipe in the bottom is that the pond silts up
> >> > & the stand pipe is buried eventually. All dams eventually become
> >> > useless due to silting. There are several hydro/irrigation schemes on
> >> > the Mississippi River silted up in less than ten years & now useless.
> >> It's called dredging. You have to do it eventually, however you take
> >> off the water. With the stand pipe, if it is on a flexible hose you can
> >> haul it up every few months and let it drop back onto the mud.
> >> Tim
> >Not practical on the huge scales of the Mississippi dams. & where
> >would you dump all the dredged material?
> They pump it out and build up land along the shore. Ever watched a
> pump dredge with an "exhaust" pipe that's hundreds of feet long?
> John
The High Aswan Dam is one of the worlds biggest far, larger than
anything in the USA, The soviets built it back in the 60s. As it
filled, minor earthquakes were recorded. It contains 165 cubic
kilometers of water (or did), [A km cu of water weighs 1,000,000,000
tons] So the problem is moving billions of tons of sediment. As the
lake is 300 miles long and up to ten miles wide, dredging it is an
impossibility. If it's impractical to dredge the Mississippi dams the
High Aswan dam a hundred times less practical!
I visited it 20 years ago, a veritable mountain as it's constructed of
rock and earth.
You have to understand that the USA has fallen behind in almost every
aspect of engineering.
XML site map
> -> pipe plumbed through the base of the pond with a large perferated riser
> -> that reached above the level of the pond. Then you put a float inside
> -> the riser so if the water is used up to where the pond is nearly dry the
> -> float would seal over the pipe and stop you from draining it completely
> -> ... and preserve the siphon.
> -> But like an idiot I didn't think of that when I had the pond dug, so now
> -> i'm too paranoid to dig one in with the thing full of water. It holds
> -> water so well now I figure if I break the pond down to put in the pipe
> -> i'll risk never having it hold water again :) I mean now it holds water
> -> all summer .. it kicks ass. If it ain't broke don't fix it kind of
> -> situation
> -> So it goes
> -> but the floating barrel idea .. now that one I might put into action,
> -> just don't want to dig into things too much
> -> cheers
> -> -zachary
> Well, you could just drape a flexible hose over the top of the dam and
> fill it with water so it acts as a syphon. The end in the pond could be
> attached to a float.
> dow