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Rain Water Harvesting
Rank: Elder Joined: 11/7/2007 Posts: 2,182
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dunkang wrote:RAIN WATER HARVESTING Suppose u have a house that measures 12m by 12m (i.e 40X40ft), this means that the amount of water u can collect in a year is 12X12X1.2=172.8cc or 172,800liters. (Here, we take the annual rainfall is 1200mm). According to demand, for a middle class household, the daily demand is 150liters per day per person, which is to say 54,750liters annually. For a house with a dad, mom and 2 kids, the figure is 219,000liters. This means, if you can be able to collect all rain water, this is 78.9% of your demand. Size of the tank will be derived from a mass curve (cumulative demand vs cumulative rainfall curve). To cut my long story short, am strongly advocating for RAINWATER HARVESTING from roofs, rocks, streams etc. For any details, don't hesitate to consult a water engineer. Here at Kenya, someone needs to come up with a policy that all buildings MUST be fitted with a rainwater collection mechanism and the government gives incentives (tax laxes on construction equipments and fuel) to individuals and corporates that harvest's rain. that is a lot of water for 1 person 7 jerricans!! eish!! LOVE WHAT YOU DO, DO WHAT YOU LOVE.
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Rank: Elder Joined: 11/7/2007 Posts: 2,182
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how much is a 1000 liter plastic water tank, the cylindrical ones? LOVE WHAT YOU DO, DO WHAT YOU LOVE.
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Rank: Member Joined: 11/21/2006 Posts: 608 Location: Ruiru
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Between 8 and 10k depending on where you are kyt wrote:how much is a 1000 liter plastic water tank, the cylindrical ones? "..I am because we are. "― Ubuntu, Umtu,
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Rank: Elder Joined: 2/7/2007 Posts: 11,935 Location: Nairobi
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Flush toilets are a total waste....Or are there economical ones which uses less than 5 litres per session? Nothing great was ever achieved without enthusiasm.
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Rank: Elder Joined: 8/4/2008 Posts: 2,849 Location: Rupi
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Njung'e wrote:Flush toilets are a total waste....Or are there economical ones which uses less than 5 litres per session? Yeah there are. I think they use 2litres per flash. A number of institutions are using this nowadays. Lord, thank you!
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Rank: Member Joined: 12/2/2009 Posts: 286 Location: Nairobi
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@tom-boy Sprinkler irrigation is so wasteful of water. I use drip irrigation and have done the garden in such a way it has a natural gradient, thus the water spreads down the gradient naturally. The laudable is more often than not rendered laughable by overclaim
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Rank: Elder Joined: 11/7/2007 Posts: 2,182
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GGK wrote:Between 8 and 10k depending on where you are kyt wrote:how much is a 1000 liter plastic water tank, the cylindrical ones? @ggk which brand is the best? And where can i get one? LOVE WHAT YOU DO, DO WHAT YOU LOVE.
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Rank: New-farer Joined: 10/14/2010 Posts: 53 Location: Nairobi
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Gathige wrote:@nostoppingthis,
I will inbox u my email.
For me i just used the normal coloured profile mabatis. I just hope they do not release Zinc ( in case they have any). You get bigger volumes with Concrete that u can get with Plastic. My 50,000 litres i assume there is no plastic of that Size ( and if any, could be too big for a small compound). With a well done concere there would be no seepage as both the interior and exterior walls are well finished
On effluent, i have no input. Try a new posts and there could be a green Wazua with ideas.
which company did you purchase the mabatis from?
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Rank: New-farer Joined: 10/14/2010 Posts: 53 Location: Nairobi
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Euge wrote:Njung'e wrote:Flush toilets are a total waste....Or are there economical ones which uses less than 5 litres per session? Yeah there are. I think they use 2litres per flash. A number of institutions are using this nowadays. any idea on company selling this?
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Rank: Member Joined: 12/2/2009 Posts: 286 Location: Nairobi
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Tile & carpet, mombasa rd The laudable is more often than not rendered laughable by overclaim
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Rank: New-farer Joined: 1/26/2011 Posts: 18
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nyce! lets send these Nairobi water and sewerage company employees on early retirement. They have been doing alot of nothing its about time they did that at home.
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Rank: Veteran Joined: 4/4/2007 Posts: 1,162
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In ASAL areas where it may rain once, all roof catchment may be collected and stored.
Tank size thus = Annual rainfall x roof area x run-off co-efficient
eg. Take Kamulu Area:
Annual rainfall (90% probability) - 500mm/year
Roof area - let's say 10m x 20m = 200m sq
Run-off coeff for mabati roof - 0.9 (it means you get 90% on the rain falling on the roof)
Tank size = 500/1000 x 200 x 0.9 = 90 m cubic
The most critical parameter in ASAL areas is to have storage that will span the drought period. Further, 90% probability rainfall for the area (not average rainfall)should be used. For the most economical design, always consult a water(civil) engineer esp if your only water source is rain.
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Rank: Elder Joined: 12/9/2009 Posts: 6,592 Location: Nairobi
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Very good ideas. When I build I'll borrow the rain harvesting concept from you. For now we have a farm we run (green house) using drip method and what we've done is we've dug a well and installed an electric pump which fills 1,000l tanks. When I learnt this I was over the moon because we were stuck and we could never have afforded a borehole.
BBI will solve it :)
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Rank: Elder Joined: 2/26/2012 Posts: 15,980
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Trying to figure out how best to use rain water that flows to the shamba after rains. My thinking is that I could use it when it dries up, but how best do I store it? Anyone? "There are only two emotions in the market, hope & fear. The problem is you hope when you should fear & fear when you should hope: - Jesse Livermore
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Rank: User Joined: 8/15/2013 Posts: 13,237 Location: Vacuum
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murchr wrote:Trying to figure out how best to use rain water that flows to the shamba after rains. My thinking is that I could use it when it dries up, but how best do I store it? Anyone? underground Water pans If Obiero did it, Who Am I?
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