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Rain Water Harvesting
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.
majimaji
#42 Posted : Monday, August 01, 2011 3:39:08 PM
Rank: Veteran


Joined: 4/4/2007
Posts: 1,160

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


Joined: 12/9/2009
Posts: 6,523
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.

Stand for something or you will fall for anything. Today's mighty oak is yesterday's nut that held its ground. Rosa Parks
murchr
#44 Posted : Monday, November 09, 2015 1:54:27 AM
Rank: Elder


Joined: 2/26/2012
Posts: 14,885
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
.
Swenani
#45 Posted : Monday, November 09, 2015 9:39:41 AM
Rank: User


Joined: 8/15/2013
Posts: 13,039
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
Poverty is the root of all evil
Tokyo
#46 Posted : Monday, December 19, 2016 11:56:07 AM
Rank: Veteran


Joined: 10/9/2006
Posts: 1,420
Any advice where to buy PVC gutter system?
work to prosper
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.
Tokyo
#48 Posted : Monday, December 19, 2016 3:29:55 PM
Rank: Veteran


Joined: 10/9/2006
Posts: 1,420
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
Taurrus
#49 Posted : Friday, December 30, 2016 11:48:49 AM
Rank: Member


Joined: 8/25/2015
Posts: 773
Location: Kite
Tokyo wrote:
Any advice where to buy PVC gutter system?

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


Joined: 2/16/2007
Posts: 2,100
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?
duky
#51 Posted : Tuesday, January 03, 2017 8:47:31 AM
Rank: Member


Joined: 2/21/2007
Posts: 72
Gathige wrote:

Anyone out who needs tips on how to harness rain water for your home use? I recently completed two projects and happy that all my water needs are sorted out and no one will ever bill me for water!

Would be happy to share tips with anyone interested on how to do it right and avoid being conned my masons!


@Gathige
Are your concrete tanks still serving you well? Kindly send me the contacts of your fundi on kpaulm@yahoo.co.uk Appreciated
hardwood
#52 Posted : Tuesday, January 03, 2017 12:35:34 PM
Rank: Elder


Joined: 7/28/2015
Posts: 9,471
Location: Rodi Kopany, Homa Bay
Chaka wrote:
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?


Yes. They are called first flush diverters.

http://www.rainharvest.c...first-flush-diverter.asp
sysdevPM
#53 Posted : Friday, February 16, 2018 3:36:20 PM
Rank: New-farer


Joined: 6/14/2011
Posts: 32
Location: nairobi
Barrywhite wrote:
@nostoppingthis,@tom_boy

hello Barry

what model of pedrollo are you using to pump the grey water ? the special trash pumps ama kawaida ones?

I agree. I have done the same. I did totally independent plumbing work for black water, and for grey water. Black water is generally of very little volume and that goes to a small sceptic tank and the waste decomposes naturally without any intervention by me. The grey water - bathrooms, laundry, kitchen and run-off from the compound goes to a soak pit, where l have installed a small pedrollo pump and have run the piping along the perimeter wall and the house perimeter. Twice a week, l switch on the pump for one hour. My lawn is ever green!


sysdevPM
#54 Posted : Friday, February 16, 2018 3:45:18 PM
Rank: New-farer


Joined: 6/14/2011
Posts: 32
Location: nairobi

Barrywhite wrote:
@nostoppingthis,@tom_boy
heI agree. I have done the same. I did totally independent plumbing work for black water, and for grey water. Black water is generally of very little volume and that goes to a small sceptic tank and the waste decomposes naturally without any intervention by me. The grey water - bathrooms, laundry, kitchen and run-off from the compound goes to a soak pit, where l have installed a small pedrollo pump and have run the piping along the perimeter wall and the house perimeter. Twice a week, l switch on the pump for one hour. My lawn is ever green!

Amores
#55 Posted : Tuesday, September 10, 2019 6:15:00 AM
Rank: Veteran


Joined: 11/25/2011
Posts: 2,013
Location: Nrb
Hello all,
I know these are old threads but am looking for fundi to construct an underground water tank. Anyone with contacts ?
I am happy
newfarer
#56 Posted : Tuesday, September 10, 2019 6:50:32 AM
Rank: Elder


Joined: 3/19/2010
Posts: 3,295
Location: Uganda
Amores wrote:
Hello all,
I know these are old threads but am looking for fundi to do construct an underground water tank. Anyone with contacts ?


try

+254 722 894121 very calm and responsible .
punda amecheka
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