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Rain Water Harvesting
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Nicky thompson
#41 Posted : Monday, August 01, 2011 2:26:55 PM
Rank: New-farer

Joined: 1/26/2011
Posts: 18
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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majimaji
#42 Posted : Monday, August 01, 2011 3:39:08 PM
Rank: Veteran

Joined: 4/4/2007
Posts: 1,162

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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2012
#43 Posted : Monday, August 01, 2011 3:50:38 PM
Rank: Elder

Joined: 12/9/2009
Posts: 6,592
Location: Nairobi
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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murchr
#44 Posted : Monday, November 09, 2015 1:54:27 AM
Rank: Elder

Joined: 2/26/2012
Posts: 15,980
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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Swenani
#45 Posted : Monday, November 09, 2015 9:39:41 AM
Rank: User

Joined: 8/15/2013
Posts: 13,237
Location: Vacuum
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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Tokyo
#46 Posted : Monday, December 19, 2016 11:56:07 AM
Rank: Veteran

Joined: 10/9/2006
Posts: 1,502
Any advice where to buy PVC gutter system?
work to prosper
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Njung'e
#47 Posted : Monday, December 19, 2016 12:30:07 PM
Rank: Elder

Joined: 2/7/2007
Posts: 11,935
Location: Nairobi
@Tokyo,

Yasin Technology, hapo Mlololngo. It's a Chinese Company but they have very well and aesthetic and beatiful PVC gutters, downcomers and their accessories. Call them on 0776007293.
Nothing great was ever achieved without enthusiasm.
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Tokyo
#48 Posted : Monday, December 19, 2016 3:29:55 PM
Rank: Veteran

Joined: 10/9/2006
Posts: 1,502
Njung'e wrote:
@Tokyo,

Yasin Technology, hapo Mlololngo. It's a Chinese Company but they have very well and aesthetic and beatiful PVC gutters, downcomers and their accessories. Call them on 0776007293.

Asante sana. Will call them.
work to prosper
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Taurrus
#49 Posted : Friday, December 30, 2016 11:48:49 AM
Rank: Member

Joined: 8/25/2015
Posts: 839
Location: Kite
Tokyo wrote:
Any advice where to buy PVC gutter system?

Japan ama?smile
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Chaka
#50 Posted : Friday, December 30, 2016 12:43:21 PM
Rank: Elder

Joined: 2/16/2007
Posts: 2,114
Are there special filters used to keep out twigs,dust etc.. from entering the water tank i,e if the water is for domestic use?
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  | | Edit by user: Friday, December 30, 2016 12:49 PM | Reason: Not specified
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