This past week we were very excited to install a rainwater collection system at Birney Elementary School in University Heights, San Diego, CA. It included a 300 gallon ferrocement cistern (Model LFC-300) that we hand-made at our shop and then assembled on site. The catchment area is a large multi-classroom roof so they will get lots of rainwater to use for their school garden!

School gardens are extremely effective for experientially teaching kids about natural history and ecology, nutrition, water cycles, carbon cycles, soil ecology, and food cycles -  not to mention what good food should taste like! They also teach kids environmental stewardship, foster a connection with nature and build practical skills. Having a rainwater harvesting tank adds an additional observable element to the garden letting kids actually see what is happening with water on site. It also saves the school money by using less water and reducing demand on stormwater drainage systems.

The rainwater from the tank will be used to water trees and plants in the garden. A garden hose attachment makes is easy to move the water around using only gravity. The tank is light proof so no algae can grow, letting water be stored as long as needed. The tank and all parts of it are potable grade to provide the highest quality water. A first-flush device (#2 in photo below) allows the first few gallons from a rain event to be diverted from the tank and back to the drain ensuring the tank water is extra clean for plants.

The kids are planning to hand paint the tank - something you can only do with cement tanks. Plastic and metal tanks flex too much so the paint would flake off. We look forward to teaching the kids about water and rainwater harvesting in upcoming classes!

Remember, just 1 inch of rain over 1000 square foot of roof equals 600 gallons of water!

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Unfortunately, rainwater harvesting has received some bad press lately convincing a significant amount of Americans that rainwater harvesting is illegal and the government will come after you for engaging in this practice. THIS IS NOT TRUE! Lets take a look at the actual laws.  

First off, the unfortunate story that received national attention and created this problem was about a man in Oregon who built dams on his property, creating three artificial lakes, complete with boat docks and fish. His case was described as one that was far in excess of an individual’s simple collection of rainwater. However, the article titles made it sound like the average person could go to jail for catching a little rainwater. This man never went to jail but repeatedly did not follow orders to drain his lakes.

Rainwater harvesting is legal is every state.

Some states significantly limit the amount of rainwater you can collect. All states have laws to regulate the building of lakes. But every single state lets you collect rainwater from your own roof. Here in San Diego County you don't need a permit for rainwater harvesting tanks - even pretty big ones - as long as you follow some commonsense regulations in how you hook the tank up. The County even has multiple rebates for people who install tanks, up to $450!

David Tarsi's blog documents the rainwater harvesting regulations of every state. His research has found there is currently no state government law in the U.S. that considers rainwater harvesting by individuals (home owners) in a direct manor and bluntly, “against the law” for anyone and everyone.

Please don't let deceptive articles sway you from rainwater harvesting - it's not only legal, but it's easy, can save you money on your water bill and help build a regenerative future!

In part of India the drought is so bad that they actually fine people if they DON'T have rainwater harvesting systems!

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How much does it rain where you live? Do you know? Does it matter?

It is easy to guess how much it rains, maybe you look at a bucket or puddle but to really know you must use some kind of proper gauge, like the one above.

It is important to measure rainfall to calculate your supply when trying grow plants, manage stormwater or prepare for years of flood or drought. After all, if you don't know how much you're getting, how can you prepare for the future?

The easiest way is to buy a gauge. The AcuRite 00850A2 5-Inch Capacity Easy-Read Magnifying Rain Gauge is less than $4 on Amazon (click item for link). Then, take the gauge and place it (often mounted to a wooden post) at a level that is easy to read. Be sure the gauge is not near any buildings or trees because wind can push the rain to fall at an angle and be blocked by an object which might give you a bad reading on your new gauge. I like to put out two gauges in different places and compare them - but I realize that is pretty nerdy!

Once you get some rain and check the gauge it is best to write it down so you don't forget! Then, you can use the data to figure out your annual rainfall. Just add up all the numbers. But wait - what month do you start and end with to find out how much you got for the year???

Professionals that measure rainfall sometimes argue about this. Two years ago, after using the so-called rain year - July to June - for more than 130 years to measure precipitation totals, National Weather Service stations in Southern California started using the "hydrological year" - October to September. Why does it matter?

In order calculate an accurate and comparable average, the beginning and end of the "year" that is used should be outside of the rainy season or after a normal break in a rain season. For example, the calendar year begins and ends right in winter, when a lot of places get a significant portion of their precipitation - this makes it often a bad time to start record keeping.

It can be tough because different places in the country have breaks in the rain at different times so it's hard to have just one type of "rain" year to easily be comparable. Luckily this problem is pretty easy to fix - every weather service station nationwide produces two rainfall totals: one based on the calendar year and a second based on local preferences. The big question is when should your local area make it's rain "year"?

Looking at the above graph in Ramona, CA (eastern San Diego County) where we have our permaculture education and demonstration site, you can see the rainy season comes to an end in June. That means either the rain year - July to June or the "hydrological" year - September to October - would be appropriate to use, the former being the most accurate.

So far, this "year" in Ramona we have received higher than average rainfall, like much of California has. A nice change from some recent lower than average years. As we go from extreme years of drought to extreme years in flooding, knowing how much rain we get allows us to properly prepare our rainwater harvesting systems, whether they be active or passive systems, for the future. This reduces the chance of problems or system failures allowing maintenance to be minimal and us to sit back and relax whether the weather is bone dry or soaking wet. Remember to design with the future in mind!

Resources:
U.S. Climate Data - http://www.usclimatedata.com/ - rainfall totals and graphs by city.

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Here in a dryland environment (San Diego County), rainwater harvesting is critical in weaning ourselves off of foreign water and creating a sustainable and local water supply. What a lot of people don't realize is even in a place that doesn't get a lot of rain, like coastal San Diego County - approximate average of 10 inches of rain per year - you can still catch a HUGE amount of water! For example, the average home in San Diego County has a 2000 square foot roof. With JUST one inch of rain this size roof would catch 1200 gallons of water - this is active rainwater harvesting. This pales in comparison to the amount of rainwater that can be caught in healthy soil - passive rainwater harvesting. Lets explore these two types of systems, active and passive.

Passive rainwater harvesting freely works without the need of a person, switch or valve. The more passive a system, the less energy it needs.  Earthworks, simple structures and strategies that change the topography and surface of the soil, are a great example of this system. They can speed the infiltration of water, augment soil moisture and nutrient availability and provide large quantities of high quality rainwater to gardens and landscapes. Water can be collected in huge amounts from roofs, streets, vegetation, bare dirt or greywater drains. This water is only available for limited periods after rainfall depending on soil type, mulch, climate and plant uptake but it can recharge groundwater.

Something as simple as applying a layer of mulch around your plants can reduce water usage by 25%, creating a passive system.

Active rainwater harvesting requires a person, switch or valve to actively turn it on/open or off/closed. The more active a system, the more energy it requires. The best example of this are storage tanks or cisterns that collect rainwater from roofs. This allows you to store the water for when you need it, like summer, to be used to water plants or anything else. The downside is these systems tend to cost more than earthworks and limit your storage capacity to the size of the tank.

So which is better? Lets look to nature for the answer since natural systems are the most efficient as they don't need external inputs. For this reason passive rainwater harvesting systems are the best! You only need to build them once, and if done properly, you will never need to maintain them or add anything to them - like healthy soil in your yard. However, active rainwater harvesting systems are still a critical tool for creating water independence. For example, here is San Diego County we can use rainwater harvesting tanks, an active system, to significantly reduce our need to import water from distant places (Click for our past blog on where San Diego's water comes from).

The best is to use both active and passive systems. What's important is to build and install them properly to ensure they work efficiently, creating a sustainable and even regenerative future for us all!

Resources
Brad Lancaster's rainwater harvesting website - full of useful information. His books on rainwater harvesting are the best out there!
https://www.harvestingrainwater.com/

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Have you ever tasted rainwater? Maybe stuck your tongue out trying to catch some drops, but probably not a whole glass?

Drinking rainwater is not only safe, but actually safer than the water you get out of your tap. Tap water normally contains chlorine or other chemicals while rainwater is clean (assuming you don't have air quality problems) and even can have a little bit of good minerals in it.

Collecting rainwater for drinking is still illegal in California as it is in many states. However, in Texas it is legal to bring rainwater into your home for potable use.

Rainwater normally has a relatively low Ph, around 5.6, so slightly acidic, but totally safe. Amazingly, storing rainwater in a cement cistern or tank, like ours, brings the Ph up a little bit, to about 7-9, creating the ideal Ph for drinking water!

The most common limiting factor when considering drinking rainwater is the type of roof you have. Asphalt shingle roofs are the most popular type of roof and are the least safe, requiring a significant amount of filtering. Metal, cement and tile roofs are the most safe types and require minimal filtering before drinking. We will talk more about filtering in a future blog post.

Quick slideshow of installing a ferrocement rainwater harvesting tank in Poway, CA (San Diego County). We make these tanks in pre-cast, modular sections. This means we can easily roll the sections into your yard for installation and don't need to do any messy concrete work on-site. This tank is 300 gallons.

Link to more information about our tanks:
Water Tanks

We know the popular idiom "it's raining cats and dogs," but here at Permasystems we like to say it's raining tanks and cisterns! In San Diego County we have been enjoying a wet winter, a nice change from the past few dry years.

Although we have already hit the average total amount of rainfall for the year we are only about half-way through our wet season of December to March! At our ecological design education and demonstration site in Ramona, CA (San Diego County) we have received about 16 inches so far this year. Our average is about 16 inches a year so we are looking great! Northern California has especially received a lot of rain and snow, snow being the most important for us here in Southern California as we receive about 20% of our water from that.

There are currently a plethora of articles in the media talking about if the drought is over. People want to know if water restrictions going to be lifted? Is the drought over? Drought this, drought that.

Here at Permasystems, we don't think the question of whether we are in a drought or not should be the central issue or talking point. The point is the AVERAGE rainfall we are seeing is going down and the AVERAGE temperatures are going up. We certainly need to plan for "drought" years but we absolutely cannot go back to the amount of water we were using pre-drought, (most recent) once the "drought" is over. We NEED to plan for the new normal.

There are many things we can do to adapt to these new conditions. For one, we need to ramp up rainwater harvesting on a massive scale for homes, business, schools, government builds, streets, parks, etc. Not only are we seeing less rain but more intense rain events in short periods of time that cause serious flooding.

Properly planning for rainwater harvesting not only stores water for us to use later, like in tanks, but, for example, by creating what are called infiltration basins (see photo below) we allow water to slow down and sink into the landscape. This reduces the amount of flooding while also getting more water to plants.

Secondly, we need to use water efficient devices. Toilets, shower heads, dishwashers, clothes washers, etc., all can add up to saving a lot of water with the right products. An often-cited 2011 study of California single-family water consumption estimated that the average California household indoor use accounted for more than 170 gallons per household per day. Not surprisingly, the most in-home water consumption was in toilet flushes. A more shocking finding, however, was the whopping 18 percent lost to leaks inside homes, the study found.

Third, we need to embrace greywater. Greywater is the reuse of water from showers, washing machines, etc. This gently used water would have just gone into the drain, but with greywater you can get another entire use out of the water, like giving it food bearing plants. This system allows you to double the use of the water!

Fourth, utilize plants that are adapted to the environment they are growing in. Slowly San Diego County is learning that a climate-adapted plants (something that is drought-tolerant) can save a significant amount of water. Water thirsty plants and trees are becoming too expensive to care for and due to decreased rainfall can begin to die or increase the plants' susceptibility to disease. When this happens, crews need to come into remove the trees before they become a hazard - all of which could have been avoided if a drought-tolerant plant had been chosen.

Fifth and last, use less. Once we get used to using less water, it's easy. Shorter showers, less toilet flushing, less car washing, no lawns, fixing leaks, etc. - all adds up to a lot!

SoCal Water$mart is currently offering a $250 dollar rebate on our water tanks!

Funding for the SoCal Water$mart program is through a partnership between the Metropolitan Water District of Southern California and its 26 member agencies throughout Southern California. Their commitment to developing an affordable balance between supply and demand has made “finding” water a mission.

The Metropolitan Water District of Southern California is a state chartered cooperative of 26 member agencies—cities and public water agencies—that serve about 18 million people in six counties. Metropolitan imports water from the Colorado River and Northern California to supplement local supplies, and help its members to develop increased water conservation, recycling, storage and other resource-management programs. Metropolitan draws supplies through the Colorado River Aqueduct, which it owns and operates.

The rebate process is simple and fast, we are happy to help you through the process.

Contact us for a free at-home consultation to see if our rainwater harvesting systems are right for you!