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Rainwater collection

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Jubilacion
cerebrozo
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Rainwater collection Empty Rainwater collection

Post by cerebrozo Sun May 21, 2023 6:22 am

The government has a program underway to install an additional 4,000+ "nidos" to collect and purify rainwater from rooftops in Guadalajara and several other municipalities in Jalisco state.

Nidos de lluvia
Sistema e captación de agua
https://nidosdelluvia.jalisco.gob.mx
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Post by Jubilacion Sun May 21, 2023 7:31 am

I visited the website and see they are also in Jocotepec and east of us in Mezcala and San Pedro and over the hill in Ixtlahuacán de los Membrillos...

Very interesting idea and short term solutions during the wet months.

Beer

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Post by mudgirl Sun May 21, 2023 3:25 pm

Why do you think it's a short term solution during wet months? Collected water can be stored and used during dry seasons.

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Post by RickS Sun May 21, 2023 4:19 pm

mudgirl wrote:Why do you think it's a short term solution during wet months? Collected water can be stored and used during dry seasons.

Collecting is one thing.... collecting and storing PURIFIED water for the long term takes some infrastructure that may not be available. Just a guess.
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Post by mudgirl Sun May 21, 2023 5:39 pm

Well, it isn't necessary for rainwater to be purified for most uses. You don't need purified water to flush the toilet or water the garden, or wash your floors or the laundry, or even shower unless you are going to get the water in your mouth. Rainwater doesn't need to be purified to wash your dishes- it's not like well water that can be contaminated by nearby septic systems or agricultural chemicals.

If the rainwater catchment, pipes and storage are kept clean, rainwater is pretty safe stuff anyway. For years, in the summer, I have put my empty garafons under the rainspout that drains off my roof and balcony and drunk that water, with zero ill effects. I wait until it's been pounding rain for an hour, so any dirt on the roof and balcony are well washed away.

I started doing it years ago one summer when we had a big flood that washed out our road and broke the water mains. Not only was there no water coming through the pipes, the road was completely impassable for 3 weeks- you couldn't drive in and out from our area, so I couldn't get garafons. I caught water in pails for everything else.

I would only be concerned about rainwater if I lived in a heavily industrial area, acid rain and such.

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Post by RickS Sun May 21, 2023 6:49 pm

All good points. The OP however was sharing with us a program that is purifying rooftop rainwater at a per-household level for personal consumption. At that level it is a short-term solution....only available during the rainy season it would appear.
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Post by mudgirl Sun May 21, 2023 7:27 pm

Yes, I realize that, but it doesn't make much sense to me. Rainy season is when ground water levels rise and wells fill up- it's not the time of year when there are water shortages.

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Post by RickS Sun May 21, 2023 8:02 pm

It's a government program.... maybe that explains it.
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Post by rafterbr Sun May 21, 2023 8:52 pm

Great idea to store the rain water. Stupid idea to purify it and use during rainy season. Water should be stored and used during dry season when it can be easily and cheaply be purified with a charcoal system. I have been thinking of installing a cistern type rain water system to my casa in Riberas next time I do any construction. With all the water problems Lakeside, I think this would be a good safety measure and could be done cheaply. Only need rain gutters around casa, an aljibe to store the water and a cheap charcoal filter to run the water through when I use it.

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Post by mudgirl Sun May 21, 2023 10:28 pm

I've been thinking of doing much the same. Where I live here in Sayulita, the town has been super low on water since the beginning of April. They are only sending dribbles to my area and I've had to buy 2 pipas of water and be super conservative. The water trucks are going back and forth all day all over town.
If I dug up the area just inside my gate, under where I park, and buried a 10,000 litre tank that got filled in the rainy season, I could get through the times of no water in the late spring, early summer.

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Post by ferret Sun May 21, 2023 11:47 pm

It sounds wonderful and it was our intention to do this when we built our house in San Pancho, Nayarit. The very real problem is that the rainfall here (and there) all falls in a very short time frame and requires a HUGE storage facility. A storage facility that is most likely far greater in size than your house itself.
1)
A one-inch rain will collect 600 gallons from a 1,000 square foot roof
https://waterwise.arizona.edu/ways-save-water/harvest-rain#:~:text=Think%20there%20isn't%20enough,lot%20will%20receive%202%2C800%20gallons!
2)
Volume 1 US liquid gallon = 3.78541 liter
3)1 Cubic Meter = 1000 Liters This means that there are 1000 liters in one cubic meter. To determine the number of liters in a cubic meter, we multiply the value in cubic meter by the conversion factor. How many liters in a cubic …
calculatorology.com
4) The last two years here, there has been an average of 40 inches of rain in the season. https://www.ajijicweather.com/wxrainhistory.php

Assume you only have 1,000 square feet of roof surface that can be harvested. On that surface will fall 600 gallons x 40 inches = 24,000 gallons of rain or 24,000 x 3.78 liters= 90,720 liters of rain. 1,000 liters of water in a cubic meter means that you have to build a storage facility of 10 meters width by 10 meters length by 9 meters deep. No matter what size of storage you actually provide for rainwater, make sure you have an overflow that can divert the water away from your house because you will overflow the space you have provided.
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Post by mudgirl Mon May 22, 2023 12:40 am

That presumes that you would want to capture and store all of the rainwater that falls on your roof.
The average water usage per day for the average American is 250 litres. (and I'm not nearly as wasteful with water as the average American) That means 90,720 liters would last for 363 days, an entire year.

I don't need to store enough water for a year. I'd just need storage for when the city wells run dry or their pump breaks or some idiot construction project breaks a municipal water pipe. Once whatever size rainwater tank I used was full, I would disconnect the pipes. 10,000 litres of water would last me for 2 months, at least.

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Post by ferret Mon May 22, 2023 7:01 am

I hear ya. I never draw from my cistern unless there's a problem...municipal or other. The street water comes in with enough pressure to take it up to the tinaco on the roof of my one storey house. There have been a few times where the tinaco became empty and I have had to draw from the 6,000 liter cistern and that is achieved with a simple 1/2 HP by-pass pump. Flip a lever, turn the pump on and up she goes to a 750 liter tinaco.
Sometimes, the filter that I have on the street water becomes clogged earlier than normal and that will also prevent it from getting to the tinaco. That involves changing the filter before drawing from the cistern. Either way, it's a good and simple system.
I also use very little water.
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