Ludi, how often does that rain event happen where you get flooding at 39million gallons per hour? Despite being a drought, it looks to me like you have an excess of
water.
Is rain and the well your complete sources of water? Have you ever had to bring water in? How often and how much?
Have you done a rain water harvesting calculation for your buildings and tanks that take into account rainfall and times between rain events? We could work through that now. It
should tell you how much excess capacity you have.
I think to get more help with the overall plan, it would be useful to gather the information in once place. It's quite hard having to read through the
thread again and try and keep all the information in one's head. Do you have a system at home where you have all the information easily readable?
Maybe people who do formal design can offer some suggestions here. I'm thinking a document that shows all inputs in one place for instance. I'm also seeing some really good suggestions from people, and it would be good to keep them in some kind of order and see how they interrelate. Part of design is how to contain and use information. Something like googledocs might work. You want a system that keeps the information easily accessible, and in bullet points or similar without all the discussion around it.
I liked the idea of using an overlay, and wonder if there is a way to do that
online so we can all take part? Does anyone know?
In terms of overall design, we're talking about a plan over time right? So that when you go to implement a specific
project eg the food forest by the water tank, you can easily see how this will fit into all the other things going on, rather than doing it in isolation. The point being to increase efficiency and reduce the inputs that cost you (esp in terms of time and labour).
I agree with whoever said focussing on water. It seems so crucial to everything else you are trying to do, and if you could sort that I think things would become much easier for you.
The other thing I would look at doing is encouraging weeds wherever possible, esp ones that can produce mulch and/or
shelter for you. By weeds I mean any plants that will grow on their own. I live in a dry climate, not as dry as yours, but nevertheless water and how to hold it in the
land, and increasing plant material as much as possible is what I see working.
In the short term, re your asparagus and other bed you will leave dormant for now, I would suggest getting whatever mulch and brush you can and covering those gardens. Let nature look after them for a while, but give it a hand. Keep as much moisture and life as possible going by giving shelter. I don't know what is available in your area, but this is one of the things I would do in terms of design: make a list of resources.
The hugelkulture and other experiments you are doing look very good (and I think you should be giving yourself way more credit than you are for what you have achieved so far), but they seem like second tier strategies to me, that would come once the water harvesting is set up.
In that sense, it might be worth considering paying for a consultant to come in and do the
swale etc design for you. If you are spending $1000/$2000 a year on land improvement projects, could you suspend things for a year and use some of that money to get the design right?