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  1. #1
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    Rain water Harvesting

    Hi

    I am wondering about rainwater harvesting, our well water is 28 m to small stone bed but smells. I am thinking to improve effeciency mixing rainwater or just using rain water for toilet/ shower and sink would improve skin reactions and health.

    I have yet to put in a working system, now is an optimal time to know what is required.

    I already have a well deep well pump, but this needs to be moved due to its proximity to septic drain area. The idea would be to store enough water to last for 6 months. we have water for well as back up and garden irrigation.

    There are currently 2 adults 1 child but upto 5-6 adults need to be contemplated.

    I am really looking for the mechanics of fitting the tanks pump list of kit, etc together any ideas are most welcome.

    Cheers
    im hot its so hot today.......milk was a bad choice!

  2. #2
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    Hook tanks in series, add isolation valves and pressure activated floats to stop inflow or open flow. Use buried tank for primary source of water with above ground sump pump/lift pump. Put inline filters and isolation valve again. Pipe up to your system. You may wish to utilize existing well water so set up a separate isolation tank and settling pond. You may wish to use this as soiled water source only for toilets and other shitty water use. If you have a viable outside source for potable water use it!

  3. #3
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    If well unused some time have a sample analysed.
    Are you aware of any agricultural or industrial contaminants in your aquifer?
    Obviously worth asking around from neighboring well owners.

    The fact it was potable in granny's da doesn't of course mean its safe now

  4. #4
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    For the well, try a couple of kgs of sansom.Available at many markets and used to clean/sanitise dirty water. some Thais still use this as a deodorant.It is actually Alum crystals in a rock like form.

  5. #5
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    yeah, my filter system includes Alum

    for rainwater, the easiest way is to dig a nice big underground cistern, as they do in the Mediterranean and Arab countries

    make it like a swimming pool, lots of cement and iron, and put a lid on it with access trap for 10 year cleaning
    I have reported your post

  6. #6
    Dan
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    Enough water for 6 people for 6 months is a fair sized storage tank. Not sure how much you use, but I guess (could be wildly wrong though) something like 100 liters day/person. That's 100 cubic meters you need to store.

  7. #7
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    You can't muck about with water supply. Your existing well needs to be tested for any problems and sorted or backfilled. Your "rain harvesting" system needs to be checked to ensure no hazards are introduced - polluted roofing material, polluted piping, polluted storage tanks. The water, once stored needs to be tested on a regular basis to ensure no nasties are growing.

    You say you have a deep well already, has this source been tested? Have you recently introduced the septic tank or has that been there for some time?

    As you seem to be experiencing skin problems already, time is of the essence.

    There is plenty of advice at the WHO site.
    A tray full of GOLD is not worth a moment in time.

  8. #8
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    Quote Originally Posted by david44 View Post
    If well unused some time have a sample analysed.
    Are you aware of any agricultural or industrial contaminants in your aquifer?
    Obviously worth asking around from neighboring well owners.

    The fact it was potable in granny's da doesn't of course mean its safe now
    Yes, a matter of course that meeds to be followed up in our modern times.
    The romantic ideals of simple self-sufficiency and taking for granted that natural water supply will remain pure is a passing fancy.

    Even the simple act of caste-stored water [aside from the complicated rain storage wells] needs to have a caveat attached today.

  9. #9
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    Quote Originally Posted by Dan
    Enough water for 6 people for 6 months is a fair sized storage tank.
    I don't think he mentioned being totally reliant on the tank, merely wanting to harvest the rain. Although if he only used the water from the tank for specific purposes, it may last

  10. #10
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    Quote Originally Posted by OhOh
    Your "rain harvesting" system needs to be checked to ensure no hazards are introduced - polluted roofing material, polluted piping, polluted storage tanks
    if it is all new built there shouldn't be a problem

    when the first rains come, those should not be collected, just let them wash the cachment area clean of dirt

    and water stored in a dark underground tank usually stays sweet

  11. #11
    FarangRed
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    I did exactly this over 2 years ago and the house virtually runs on rain water but we are getting low at the moment we have hardly had any rain.

    What I did was install two 7.5 cm tanks I have the space so they are above ground round the back of the house so we collect rain water from about half the house, if it had been a new build I would have built a huge underground tank.

    The half of the house roof has partly a flat roof as well a pitched roof, the flat part I put a cement scread directing the water towards the tanks, the pitched roof which overhangs the back of the house where the tanks are I put guttering up and it goes straight into the tanks, once we get some rain it dont take long to fill up.

    Then obviously we have a pump and i have a filter which I clean regular.

    Also I put an overflow pipe on the tanks and that water is directed into the well.

    I haven't bought any water for over 1 year I think I will have to soon if we dont get any rain.

  12. #12
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    Quote Originally Posted by FarangRed
    What I did was install two 7.5 cm tanks I have the space so they are above ground
    what size again??

    If they are above ground, then the water may get affected by heat etc...you don't have any problem?

  13. #13
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    My well (MIL's well) that was dug many moons ago is 30 plus meters to the water so I gave up that idea years ago. Our water table is that low too here in our area. Near Korat. I have fish ponds that I use to water the garden. I top them up from the Moo Baan at present. In the future I plan to save rainwater for this topping up. At present all of the water from my house roof drains into the "to be pond hole". In the future I will add a cistern between the house and the pond. For internal use, drinking, cooking, etc I use bottled water. Too much dirt in the air to use rainwater except as gray water.

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    Quote Originally Posted by Ceburat1
    Too much dirt in the air to use rainwater except as gray water.
    certainly for the first rains, but after that usually the air is a lot cleaner (unless you live in a city)

  15. #15
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    Quote Originally Posted by FarangRed View Post
    I did exactly this over 2 years ago and the house virtually runs on rain water but we are getting low at the moment we have hardly had any rain.

    What I did was install two 7.5 cm tanks I have the space so they are above ground round the back of the house so we collect rain water from about half the house, if it had been a new build I would have built a huge underground tank.

    The half of the house roof has partly a flat roof as well a pitched roof, the flat part I put a cement scread directing the water towards the tanks, the pitched roof which overhangs the back of the house where the tanks are I put guttering up and it goes straight into the tanks, once we get some rain it dont take long to fill up.

    Then obviously we have a pump and i have a filter which I clean regular.

    Also I put an overflow pipe on the tanks and that water is directed into the well.

    I haven't bought any water for over 1 year I think I will have to soon if we dont get any rain.
    Good for you, Red!

  16. #16
    FarangRed
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    Quote Originally Posted by DrAndy View Post
    Quote Originally Posted by FarangRed
    What I did was install two 7.5 cm tanks I have the space so they are above ground
    what size again??

    If they are above ground, then the water may get affected by heat etc...you don't have any problem?
    Never had a problem and most of the day they are in the shade

  17. #17
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    First of all, i have read a lot of information about rain harvesting, there is no romantic fantasy, just a situation that calls for alternative methods. There is no issue with the water it just has a slight smell from the well, and id prefer to use water from the rain source to mix with it or use primarily.
    There are many accounts of thai people using rain water and storing succesfully, and having a lower risk of disease and infection from contamination then other sources. Water needs to be controlled to stop legionaires but it only applies above ( ithink) 20Deg with growth prominent at about 34 deg.
    There are however no serious and dangerous risks, and the implementation can be calculated simply to need. The fact that this is used widely as and where it is needed from poor 3rd world to 1st world means it is a viable source and contribution.
    I really want to have people who have it to give me there understanding of implemntation and setup, not to rant of the ridicule of ignorance brigade.
    First flush happens to relieve the build up dirt and comtamination from reaching your tank, but i want to know what people use for an automated system?
    Tanks, concrete, ceramic, fibreglass?
    Information woukd be great rather then opinion, and the nay sayers.

    I have concrete tiles and 210 m2 roof space, there are no tree's near the roof, is there anything i can put on the roof to keep it cleaner less reactive?

    Any information and real world help would be most appreciated!

  18. #18
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    As I said above, I have a large cement cistern in Portugal

    after the first rains wash away the dust etc, I just channel the water into the tank until it is full; the tank then has a run-off to the garden

    no automation, no problems

    the water stays sweet, tastes great and is healthy

    The tank is mostly in the ground, the water is always cool

  19. #19
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    Sailingman

    The key thing here is to ensure all organic matter (leaves etc) are removed from any well or storage tank. Organics will taint the water and quite possibly produce an odour and yellowish water (like a weak cup of tea)
    Any good rainwater system should comprise of a first flush device followed by dual filtration (20 @ 5 micron). If the end user is not used to captured rain water then I would advise some form of disenfection such as uv. The metabolisim of people used to city water is totally different to those in rural areas and it is common that they suffer from tummy bugs when consuming water from wells or tanks. e.coli is the main concern and without proper filtration or disinfection one is always at risk of falling sick. Of sourse it all comes down to the individual budgets and to do it correctly and safely is not always cheap.

  20. #20
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    I have never had any problems from my water from the cistern, always sweet

    no hi-tech, no disinfecting, just rain water stored in the tank

  21. #21
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    Quote Originally Posted by DrAndy View Post
    I have never had any problems from my water from the cistern, always sweet

    no hi-tech, no disinfecting, just rain water stored in the tank
    As they say in Thailand..."Up tp you"

  22. #22
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    Quote Originally Posted by sailingman View Post
    Quote Originally Posted by DrAndy View Post
    I have never had any problems from my water from the cistern, always sweet

    no hi-tech, no disinfecting, just rain water stored in the tank
    As they say in Thailand..."Up tp you"

    they say the same in Portugal too

  23. #23
    Thailand Expat gusG's Avatar
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    One stage of a small water tank we have here. I can't find the pics of the base of this, but you will get the idea when I post pics of the larger one.



    Just checking photo sizes.

  24. #24
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    looks a good size - what will that hold when full? 20,000l?

  25. #25
    Thailand Expat gusG's Avatar
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    This is only the baby one. I think it was 6 or 8 meters by 4 X 2mtrs deep. It was a long time ago.















    Then there were the pre-stressed 4 mtr long concrete planks on top of this, with a 70mm topping of steel mesh and concrete.
    Last edited by gusG; 18-02-2012 at 12:59 PM.

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