posted 10 years ago
I would be cautious about removing debris from the bottom of your creek or deliberately making it deeper/wider. Debris slows water, catches organic material, and may help prevent/correct incision of your creek if that is an issue. A relatively "shallow" profile for a creek is actually quite desirable in my experience--if you can slow the water and spread it, get organic matter & sediment deposition, etc. this is usually a good thing.
Also, it sounds like you are maybe focusing on diverting water and "saving" it for later in the dry season, which may work (and slowing and lengthening its transport through the property is definitely a good idea), but I think the main benefit you will see from swales, ponds, etc. is a rehydration of the landscape itself. In some areas this will lead to a higher water table, seeps and springs developing, etc. which can be a major factor in getting year-round flow; I'm not sure about your area/climate--do you know if the creek ever ran year round, how big its catchment is, how long it runs before it enters your property? Not all creeks are meant to be year-round no matter what you do, but if it used to run all year and has become seasonal, it's a safe bet it can be restored. One factor, though, is that often the most effective rehydration work can be done upstream/upslope--if you find your efforts stalling out, you may need to look at what's happening upstream of your property and try to address it if that's possible at all--if not, you may be a bit stuck, but I would do what you can with what you have to work with. Rehydrating your landscape will be a huge bonus whether or not you get a year-round creek out of the deal.
I would also be somewhat cautious about introducing a lot of non-native pioneers etc. right around the creek--it's up to you, but (this is purely anecdotal, so take it with a grain of salt) I have observed what I believe to be negative alterations in water flow/retention in riparian areas due to a prevalence of introduced species, that seemed to improve with the predominance and nurturing of native species and thinning of introduced species. Like I said, this may not be accurate, it is only my supposition based on observation, but especially if you know that the creek used to run year-round, I would personally stick with (re)planting the stuff that was there when it flowed all year, since you know that can work. Shade and vegetation should 100% be a priority, though.
I also would really recommend to you a book called "Let the Water Do the Work" for more information re: dams and other alterations to your creek, lots of good info and a minimal-intervention approach that I think is well-suited to permaculture and would make good use of the materials you have available.
Good luck!