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  1. #1
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    Drainage question.

    Here is my situation.

    We have a large storm drain that runs exactly parallel to the front wall of our house and we have 2 drainage pipes that lead from our garden straight into the storm drain. Both the pipes are about 10cm diameter. They lead from our garden at about a 20 degree angle into the main drain.

    Now, when it rains really hard or if the the main storm drain can't handle all the water, our garden and house flood because all the water comes out of the storm drain, through the 2 pipes and into our place.

    Does anyone know of any kind of valve system I could fit to the drains to stop this happening?

    I can't just block them up because we need them most of the time for drainage.

    Any ideas?

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    you can block them temporarily with some sort of removable cap; that should work as the water backing up into your garden is prob not at too high a pressure

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    I've thought about doing that. The last time it flooded though we were at work so I'd have to leave them blocked most of the time. Suppose it wouldn't hurt.

  4. #4
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    Don't understand. The only way water could come the other way is if the water level was higher outside than your gaff. More info needed. I've had serious drainage probs, had to concreate half a rai.

  5. #5
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    Its when the storm drains are full and they've got a heavy flow of water going through them the pipes that lead from my garden to the drain are just an easy exit for the water.

    My driveway is lower than the main street by about 20cm so when the drain is completely full the water in the drain is probably higher than my driveway.

    Then my house is another foot lower than my drive. Its not a good design. I've got some pics of the first time it flooded in another thread. I'll have a look for them.

    Also when the drain is full you can see the water coming out of the drain covers on the street.

  6. #6
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    Sorry the pic quality is not that great.



    The first drain pipe is just behind the tree on the left and the second one is on the right next to the gate door.

    You cant really tell from the pic but the street outside the gate isn't flooded so the water is not coming from there.



    Then the house is set another foot down from the driveway and garden so this fills up with water really easily. The water is about a foot deep there.

  7. #7
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    A dutch sluice that is basically a rvolving paddle might work Imagine a small canoe paddle on a spit when the water rises it flips to block most Yu wont get a tight fit on apassive design but may stop flotsam and debris from drains entering PM if you wan more info Also on a DIY build you will probably need to clean off when re-entering Complex pumps are expensive and need triggering tho doable A study of the drains design angles blocjkages etc may allow you to pass the problem along or ameiliorate the deluge Good luck

  8. #8
    lom
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    A one-way valve may be a solution.

  9. #9
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    Water is a bastard. I can't see a way out, perhaps flood pumps, but how many?
    If your property is below the level of the storm water drainage then, I don't know.
    Maybe think about building the land up around your property, but draining the land on your property will still be a problem. Dunno, big problem.

  10. #10
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    Quote Originally Posted by MangoPeeler
    A dutch sluice that is basically a rvolving paddle might work Imagine a small canoe paddle on a spit
    This is the kind of thing I had in mind, but I wasn't sure there was such a thing. Is it possible to have this so that it can only revolve in one direction so that water could leave but not come my direction?

    Also how about if it had a rubber seal around it to get a tighter fit?

  11. #11
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    Quote Originally Posted by the dogcatcher
    perhaps flood pumps, but how many?
    I've got one decent sized water pump but the problem last time was that the water I was pumping out had nowhere to go because the drain outside was still full.

  12. #12
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    2 bags of sand, 90baht, problem solved.

  13. #13
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    The only way out is to concreate all around your house to 18 inches if you can. It will keep the water away. The water is not coming in though the pipes, it's coming in everywhere.
    Where your house meets the ground must be higher than the water level, if not you're screwed.

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    Something like this needed? but all the neighbors need one too

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    I suppose if you can fit a flap on the outside of your 2 pipes, they might help. The flaps would be shut by gravity normally

    when the water level in the drain outside rises, the flaps would be forced shut

    if water later needs to drain out of your land, and the water in the drain has gone down, then the flaps would be opened automatically
    I have reported your post

  16. #16
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    Quote Originally Posted by oldgit
    Something like this needed? but all the neighbors need one too
    That's perfect. Has anyone ever seen one of those in Thailand?





    Quote Originally Posted by DrAndy
    I suppose if you can fit a flap on the outside of your 2 pipes, they might help. The flaps would be shut by gravity normally when the water level in the drain outside rises, the flaps would be forced shut if water later needs to drain out of your land, and the water in the drain has gone down, then the flaps would be opened automatically
    Good idea also. Cheers.

  17. #17
    lom
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    Quote Originally Posted by DrAndy
    I suppose if you can fit a flap on the outside of your 2 pipes, they might help. The flaps would be shut by gravity normally when the water level in the drain outside rises, the flaps would be forced shut if water later needs to drain out of your land, and the water in the drain has gone down, then the flaps would be opened automatically
    That is the long description of a one-way valve

  18. #18
    disturbance in the Turnip baldrick's Avatar
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    Quote Originally Posted by dirtydog
    2 bags of sand, 90baht, problem solved.
    yes - 2 sand bags

    I have about 6 across the driveway front of my gate for when it floods - the water only comes in when somchai fcukwit drives his car at mach 10 down the soi

  19. #19
    Days Work Done! Norton's Avatar
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    Place a grate in your drain pipe several cms below the end. Put a ball a few cms smaller than the drainpipe in the drainpipe above the grate. Cap the drainpipe with a hole in the cap a bit smaller than the ball.

    When water attempts to come out your drainpipe the ball floats up and closes the hole in the cap. When water goes into your drainpipe, the ball sits on the grate and allows water to flow out of your yard.
    Whenever you find yourself on the side of the majority, it is time to pause and reflect.

  20. #20
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    Quote Originally Posted by Norton View Post
    Place a grate in your drain pipe several cms below the end. Put a ball a few cms smaller than the drainpipe in the drainpipe above the grate. Cap the drainpipe with a hole in the cap a bit smaller than the ball.

    When water attempts to come out your drainpipe the ball floats up and closes the hole in the cap. When water goes into your drainpipe, the ball sits on the grate and allows water to flow out of your yard.
    What's he gonna do about the water coming through the gates? Sod the pipes.

  21. #21
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    Quote Originally Posted by lom View Post
    Quote Originally Posted by DrAndy
    I suppose if you can fit a flap on the outside of your 2 pipes, they might help. The flaps would be shut by gravity normally when the water level in the drain outside rises, the flaps would be forced shut if water later needs to drain out of your land, and the water in the drain has gone down, then the flaps would be opened automatically
    That is the long description of a one-way valve
    yeah, but he can make it himself from the instructions

    I don't even have a patent for it

  22. #22
    Days Work Done! Norton's Avatar
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    Quote Originally Posted by the dogcatcher
    What's he gonna do about the water coming through the gates? Sod the pipes.
    Sodding the pipes won't help. My area of expertise lies in one way ball valves. Will have to refer him to a pratunam expert.

  23. #23
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    These flap thingys are called NON-RETURN valves, they are available in a technically edged hardware stores up to about 4 inches in brass, then above that size they become sluice valves and come in cast iron.
    Although in your situation I would go with DD's Thai solution of sand bagging or fill the place up above the water level or dig sumps or or move to Switzerland, cause this is the Venice of the East.

    all the best
    ~Glennerd~

  24. #24
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    ^Those are more commonly refered to as check valves but won't work in this instance as there is not enough water back pressure to close it when it comes back up and it comes up too slowly it will not seal well if it seals at all, if it's spring loaded then water won't flow in it either as gravity alone won't open it...

    Norton's idea has the best possibility for success with a bit of refining and engineering if FP has the ability and patience to invest.

    Another idea for those heavy rain times is just to have an extension of pipe that can be inserted to bring it up above projected level. Though that will render the drain useless on those occasions it seems it is pretty much counter productive in it's design in the first place.. It seems some kind of curbing or sill around your house is also needed along with sand bags available to block the door openings...Though it may be a trip hazard you'd have to get to used to you could also so that in front of your doors, what choice do you have at this point?

    Another thought just occurred for your entire yard, you might consider eliminating these drains altogether as the drains for your property in their current configuration as open drainage and have a sump pit (catch basin of some size maybe even a pre-formed septic tank would be good) dug under ground attached to various drains set around your yard at high flow areas.. Install a sump pump (or maybe 2 if necessary) with an auto float switch to pump out through one or both of the drains to force the water into the street drain.

    The pumps power will overcome any gravity fed back pressure and as well you should have check valves installed which would prevent back flow from the street drain on those occasions when it is only a moderate rain.

    If you wanted to get really creative you could even make it so you could use this water for other outdoor uses for example like watering your garden or washing your car? whatever.... A bit more expensive but it addresses your entire drainage problem..

  25. #25
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    Quote Originally Posted by the dogcatcher
    What's he gonna do about the water coming through the gates? Sod the pipes.
    Very little comes through the gates, I'd say not enough to flood the place.

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