Fun question Alicia! There are many ways to skin this cat, and I will echo what many of the commenters already stated. Basically there is no clean, cookie cutter way to do this. Marcelle has already compiled a lot of good case studies that could be good inspiration. I will just share some of my general thoughts and touchstones out there in the world (mostly Minnesota experience)...
Re: Developing strategies
These are a few questions I think people should ask themselves while shaping their strategies (probably nothing new to you):
-What are my resource concerns (i.e. erosion, nutrients, water quantity, habitat, feedlots, etc.)
-Where are we trying to manage runoff and pollutants (in-field, edge-of-field)
-Are there funding program(s) that has specific BMPs and design specs that you want to prioritize?
-Is there some existing landowner interest, or areas where you know you aren't going to get anything done in the near future?
-Are there other modeling tools available to help narrow down which opportunities sited potentially have the most bang for their buck? (i.e. RUSLEII, EVAAL, WEPP, water storage calculators, cost estimators) (ex. Using RUSLE2 from one of your Metro neighbors to the south: http://www.dakotaswcd.org/pdfs/Trout%20Brook%20SWA.pdf
-Am I taking this on in bite-size pieces? What are some existing initiatives or meetings that you could tag on to? It is kind of overwhelming to see all the outputs and figure out how to prioritize. I would say doing this in bite size pieces and focusing in on practices you are familiar with for your landscape is a good start.
I have seen staff use these outputs, intersect the field boundaries with the stream layer and send out a mailer to landowners within a buffered distance of the stream asking to talk to them about riparian management issues and water quantity. They didn't get a ton of call backs, but a few people reached out and they were able to improve some buffers and interest in sediment basins. This was a good communication strategy.
Another neat case study is to tag on to existing drainage management meetings. They coordinated with the drainage authority when a ditch system was up for improvement, repairs, cleaning, etc., and presented the results of the ACPF to the landowners as alternatives to traditional ways of improving the drainage system. They got someone seriously interested in a large wetland creation along the drainage system.
RE: Nutrient runoff reductions
The Iowa Soybean Association has some good watershed plan examples, and provides some information on quick ways to quantify nutrient load reductions. I always gravitate towards the Lime Creek Watershed Plan (https://www.iasoybeans.com/PDFLibraryUploads/450a12c9-1658-4ee6-979c-75cfe2a26f84.pdf
). One thing to note is that they have conducted baseline watershed monitoring in their HUC12's so the calculations have that included in their plans. I don't know what level of detail your team has for this, but just wanted to throw a touchstone I like to refer to when I am thinking about how this could look. There are projects out there to try and make developing effective watershed plans more straightforward and comprehensive using these various tools, but for right now this is the best of what I have to share.
Hope this is helpful :) Thank you for asking this question! It is a good one and gets the blood flowing to the brain!