Posts by henryfork • Home Renovation & Building Forum

henryfork

Joined 23 March 2017

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Rainwater catchment in tropics (New build)

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henryfork

13 May 2017

Re: Rainwater catchment in tropics (New build)Eco Living

May 13, 2017 12:00 am

Thanks again for your comprehensive reply SaveH20. I've had a bit of time to think about it and found a bit of inspiration from an Ohio Dept. of Health document regarding rainwater cisterns. This is what I've come up with at the moment. The silt trap isn't very big but hopefully it'll prove useful i...

Thanks again for your comprehensive reply SaveH20. I've had a bit of time to think about it and found a bit of inspirati...

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henryfork

1 May 2017

Re: Rainwater catchment in tropics (New build)Eco Living

May 01, 2017 1:30 am

I've looked around for a suitable way to minimise sediment for my system (dry piping with sunken cistern) but recommendations of first flush systems would be a bit impractical as I've got 24 downspouts in total. Like you mentioned, if I was going to do a silt trap it would need to be quite big. My o...

I've looked around for a suitable way to minimise sediment for my system (dry piping with sunken cistern) but recommenda...

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henryfork

27 April 2017

Re: Rainwater catchment in tropics (New build)Eco Living

Apr 27, 2017 12:25 am

So for the bellmouth you've shown, I continue that horizontal pipe out of the tank below grade all the way (at slope of 0% or slightly downward slope)? What I don't understand is that if the tank is below grade, than the overflow is also below grade until I can bring it to a point that is at a lower...

So for the bellmouth you've shown, I continue that horizontal pipe out of the tank below grade all the way (at slope of ...

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henryfork

26 April 2017

Re: Rainwater catchment in tropics (New build)Eco Living

Apr 26, 2017 11:29 pm

After I posted I realised that the sediment trap might not be the best idea, there wouldn't be the pressure of the sitting water to flush through the smaller sediment pipes. If I did it would definitely need the inspection orifice as I would need to flush water into it to have the sediment pass thro...

After I posted I realised that the sediment trap might not be the best idea, there wouldn't be the pressure of the sitti...

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henryfork

26 April 2017

Re: Rainwater catchment in tropics (New build)Eco Living

Apr 26, 2017 10:16 pm

We measured the drop from the house ground level to where we roughly planned the tank location, only a drop of about 0.8m. The builder would prefer to build an underground cistern, similar to a swimming pool with a cement roof. He's not so happy about doing a wet system and I suppose an underground ...

We measured the drop from the house ground level to where we roughly planned the tank location, only a drop of about 0.8...

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henryfork

23 April 2017

Re: Rainwater catchment in tropics (New build)Eco Living

Apr 23, 2017 4:42 pm

Thanks for the fast response - I'm a bit lost on your last line about not wanting to create even a short duration syphonic effect. I thought you'd want to encourage a syphonic effect to get faster flow?? Is this because it'll alternate between syphonic drainage and then normal gravity drainage and t...

Thanks for the fast response - I'm a bit lost on your last line about not wanting to create even a short duration syphon...

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henryfork

23 April 2017

Re: Rainwater catchment in tropics (New build)Eco Living

Apr 23, 2017 12:28 pm

Sorry with all these gradual questions but trying to finish this design with two young kids underfoot and not much sleep... So I've been looking at my tank overflow and now I've understand the reason for your bellmouth and the overflow being vertical. This is all based on the "Rate of Overflow&...

Sorry with all these gradual questions but trying to finish this design with two young kids underfoot and not much sleep...

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henryfork

22 April 2017

Re: Rainwater catchment in tropics (New build)Eco Living

Apr 22, 2017 6:27 pm

Thanks SaveH2O Unfortunately the builder already has the 90mm DWV downpipes on site, but I might see if I can get him to change just a few to 100mm (the ones that will get the highest flow rate) as well as increasing the size of the "pop". "reinforces that you have a good understandin...

Thanks SaveH2O Unfortunately the builder already has the 90mm DWV downpipes on site, but I might see if I can get him to...

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henryfork

21 April 2017

Re: Rainwater catchment in tropics (New build)Eco Living

Apr 21, 2017 7:14 am

Just be careful when you do your head calculations because a lot of plumbers here take the figure from the gutter's sole and then scratch their heads wondering why the system doesn't cope during heavy rain. Water that isn't a solid mass does not add to the head. I've seen mentioned a few times that...

I've seen mentioned a few times that the tank inlet should be at least 300mm below the bottom of the leaf eater/ rainhe...

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henryfork

20 April 2017

Re: Rainwater catchment in tropics (New build)Eco Living

Apr 20, 2017 5:48 pm

FRP is Fibre Reinforced Plastic I believe, about halfway down this page they list "Composition: "Fundamental composition of FRP modeling sheet: mixtures such as unsaturated polyester resin, thickener (MgO), initiator (curing agent), cross linking agent, low shrinkage additive, packing (cal...

FRP is Fibre Reinforced Plastic I believe, about halfway Link they list Composition: Fundamental composition of FRP mode...

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henryfork

20 April 2017

Re: Rainwater catchment in tropics (New build)Eco Living

Apr 20, 2017 10:00 am

Hi SaveH2O Thanks again for your replies, you're giving me much more confidence about this system. Noted about being careful about the head levels; the measurements I take should be from the bottom of the leaf catcher/rain head. There is a huge tank industry, they're everywhere here. The main's supp...

Hi SaveH2O Thanks again for your replies, you're giving me much more confidence about this system. Noted about being car...

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henryfork

19 April 2017

Re: Rainwater catchment in tropics (New build)Eco Living

Apr 19, 2017 8:24 pm

Tanks of 100kL size are very expensive here. First quote I got was about AUD $35k. My builder has suggested (he'd like his guys to remain in work so eager to do some more jobs for me) that they build it using concrete hollow block and add a non-toxic coating to prevent leaking. It'd be a square shap...

Tanks of 100kL size are very expensive here. First quote I got was about AUD $35k. My builder has suggested (he'd like h...

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henryfork

18 April 2017

Re: Rainwater catchment in tropics (New build)Eco Living

Apr 18, 2017 12:59 am

Thanks again SaveH2O. I’ve been working through my calculations and this is what I’ve come up with. Can you let me know if I’m on the right track? If I use the roof slope multiplier (I understand your comment about the wind driven rain not collecting more total rain, but will still use the multiplie...

Thanks again SaveH2O. I’ve been working through my calculations and this is what I’ve come up with. Can you let me know ...

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henryfork

15 April 2017

Re: Rainwater catchment in tropics (New build)Eco Living

Apr 15, 2017 3:34 pm

Thank you SaveH2O for your valued response. I’ve learnt pretty much everything from your replies here and on the ATA website. The Texas AgriLife Extension also has some good info but your ideas about the sediment systems/first flush make more sense. Might take me a little time to digest and apply so...

Thank you SaveH2O for your valued response. I’ve learnt pretty much everything from your replies here and on the ATA web...

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henryfork

11 April 2017

Re: Rainwater catchment in tropics (New build)Eco Living

Apr 11, 2017 4:46 pm

Hi SaveH20! Thanks for chiming in, thought I wasn't going to get any replies for a while! Yep the ground moved for us, though at the moment we are up in Manila and even there the tremors could be felt. Hopefully it's not a precursor to something bigger... I've built our house with steel frame rather...

Hi SaveH20! Thanks for chiming in, thought I wasn't going to get any replies for a while! Yep the ground moved for us, t...

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henryfork

8 April 2017

Rainwater catchment in tropics (New build)Eco Living

Apr 08, 2017 10:46 am

Hello Please excuse the length of this post! Hoping to get some advice/checking of my calculations for my house build here in the Philippines. I know these are Australian forums but I’m originally from the West Australian wheatbelt and hoping to have a functioning rainwater collection system for gar...

Hello Please excuse the length of this post! Hoping to get some advice/checking of my calculations for my house build he...

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