Does anyone here harvest rainwater?
Up until very recently, I've never lived anywhere where I had the space to set up an outdoor garden. I've been fortunate to finally own a property where I can, and I'm really enjoying it. So far I've set up an 8 x 25 garden plot, planted 4 fruit trees, and have a thriving wildflower garden in front of the house. I have a lot to learn, but I'm certainly enjoying the process.
One of my recent projects has been to install gutters on my workshop; it's a 25x50ft building. That got me thinking; why not collect the water from the gutters? I live an area that gets near-constant rain in the fall, winter, and spring, but it turns into a desert here during the summer. We haven't had more than a light mist in about a month or more. I have a roughly 60x20ft section of property hidden behind the shop, and it would be a perfect place to set up some IBC totes to collect the water.
For those of you who collect rain water for your garden, how much do you find you need/use? Based on my water bill, it looks like my usage went up by about 75 gallons per month since I've started gardening. I figure round that to 100G just to be safe; for 4 months with little rainfall, that would mean I need about 400G stored. I tend to over-engineer everything I build, so lets double that to 800G.
I'd enjoy hearing from anyone who harvests rainwater for their garden. How much water storage do you have? Do you find it's too much, not enough, or exactly what you need?
That is a lot of water. I live in a semi-rural area myself; we have access to municipal water and electric, but not sewer or broadband (just twisted-pair copper).
When you say that most houses stored 20K liters, was that solely for gardening / agriculture, or also for household use? I'm not very experienced when it comes to such things, but that sounds like something you would need for an entire household or for industrial farming.
What's kind of ironic is that I live in one of the rainiest parts of the USA (Pacific Northwest), and for a large portion of the year, the rain is just constant. I have lived in the desert before, and the summers here are just as dry as they were back then.
My initial idea was to pick up 5 330G (1250L) IBC totes and link them in series for a total of 1650G (6246L). Part of the reason I made this post was that I had a feeling that amount of water was just excessive for what really amounts to a 4-month period of use. Sounds like I might be doing myself a favor by erring on the side of caution.
At least where I live, both metal an UV plastic tanks are extremely expensive compared to IBCs. I was hoping that painting the IBCs black or covering them with a tarp would help to mitigate the algae growth from sunlight. Wishful thinking?
I have three 50 gallon rain water collection barrels and have never fully used them for irrigating my garden, as much as I'd love to. Gravity pressure alone is not enough to use any sort of automated drip system or anything and we've been left having to use watering cans when using the collected rain water. The barrels do fill up quickly after one or two good rains.
I guess my point is to make sure you have a sufficient pump design in mind to use the collected rain water. Best of luck.
So 150G total, then? It sounds like I may be significantly over-estimating the amount of water I need, although I have been wanting to plant grass in a few areas, so it might come in useful for this. How often do you usually get rain during the dry months?
A pump has always been part of the plan. The irrigation system will be right next to my shop, so I can easily run 240V from the breaker panel to a large pump outside. I bet you could find a pump for fairly cheap that would work for your irrigation system. I've seen 120V pumps on Amazon for $100-$150, and since you already have gravity working in your favor, you wouldn't need to get an expensive pump with a high head pressure.
Yeah 150 gallon total but it's definitely not enough to get me though even a couple weeks of watering if I were to rely on it. I probably use close to 60g to water all my garden once and that gets me 2-3 days before I need to water again. And we get pretty much no rain during the summer months, maybe a sprinkle but not enough to fill the barrels.
I've been looking at how to get pumps setup, the problem is it's 3 independent barrels so I'd need 3 pumps and then power. Also unsure if I want to retrofit a submersible pump or use inline on the existing spout.
I don't know how your barrels are set up, but you should only need one pump. Assuming you have a place to make all 3 barrels level with each other, you can install an output at the base of each barrel and connect all three together. When you collect water in one barrel, it increases the downward pressure of the water in that barrel, and it will equalize across the other two; filling one barrel actually fills all 3. Then just install a tap on connection between the 3 barrels and route it to a pump (I'd recommend a particulate filter first so you don't jam up the pump). When you pump water out, the inverse happens; all 3 barrels will drain equally. Even if your barrels are far apart, as long as you can keep them level with each other, this should still work as long as you're willing to run plumbing between them.
Personally, I'd prefer an inline pump rather than submersible. Not only is maintenance on the pump easier, but you also don't have to worry about running electricity into one of the barrels; I'm sure submersible pumps are safe, but you'd still have to cut an opening in the barrel for your power cables, which is a pain in the ass.
As far as power goes, as long as you can position the pump close to a structure with power, you just need to make sure you use liquid-tight conduit between the outer wall of the structure and the pump. If you want an outdoor switch for the pump, this would need to be an a liquid-tight enclosure. While it's almost certainly not to code, you could probably just install a 1-15P plug on the cable inside the structure and plug it into an outlet and have no issues. FYI: I'm not an electrician, just someone who's done a lot of electrical work.
Edit: I just realized that my comments about electrical are very US-centric; if you're not in the USA, it's probably a good idea to disregard everything I just said.
I only use water catchement for the chickens water....since the other choice is to lug water across the property. Water is heavy. It only works for ~8 months of the year too. It's a 50gal barrel, that is full all fall/winter/spring and dry durring the summer.
Where I live, apparently its illegal? Not rly sure why.
Theoretically it's to help aquifer recharging, but it feels a bit misguided when directed to homeowner gardens, which are far more environmentally beneficial than the amount of roof runoff they would be temporarily diverting.
I wonder what they would do if they caught you doing it.
I wonder if they'd ever even find out or if they did, if they'd even care.
Depends on what your cost of water is. Setting up rain water reservoirs, plumbing it to your garden, and cleaning/maintenance adds up quick. If you’re only watering a small garden, might just want to stick with the hose.
I’ve got about 800gal capacity, and I use it all. My garden is large, and all the excess gets dumped into the pond.
Your garden will get bigger. If it’s legal (where I’m at in the PNW, it’s not exactly legal to do) I’d harvest as much as you can. You’ll find uses for it.
I also live in the PNW; what kind of legal restrictions do you have on rainwater collection? Here in Oregon, it's legal as long as it's being collected from an artifical surface (like a roof). The only information I could find on limits are less than 5000G without a permit.
I’m in Oregon as well!
I just looked, and you are correct. It seems I was misled, or didn’t fully understand, but when I was building my greenhouse I was told by someone that it was not legal in certain counties. But I can’t find any source to back that claim. So I guess I’m not as rebellious as I thought.
My understanding is that not being allowed to catch rainwater is more of a urban legend. People took not being allowed to divert streams and other bodies of water and over time the telephone game turned it into not being allowed to gather rain off your roof.
I believe you are correct. It seems I must have fallen for it. Well I guess I’m not as big of a rebel as I once thought. TIL
It's been a while since I made this post, but I've finished my rainwater harvesting / irrigation system, and the advice I received here was definitely helpful. I learned some things, too.
All-in-all, though, it was a really fun project to work on. I went with a Rachio 3 sprinkler controller, Orbit valves, and ran buried pipe to all the areas that needed water. Everything just waters itself now, and I know exactly how much water each area is getting. Not only does nature provide the water for free, but I'm also not wasting potable municipal water either (at least not as much; I've still had to fill the tanks from the hose a few times). It was well worth the work and the expense; thank you again to everyone who posted here to help me out.