I agree with Renesis and Aleph. You need to check out your zoning and the rules for sure. This will not be an inexpensive project and all you need is a guest or neighbor or jealous friend to squeal on you.
There are strict strict laws and BUFFERS on all rivers and creeks, even intermittent creeks. A buffer is a distance from the bank of the river or stream and outwards where one is NOT allowed to use any fertilizer, pesticide or any construction.
Even when the creek is on your property you do not have ANY say at all about that creek or the buffer zone. I am not saying you have theses rules. This is just what I am used to in the Pacific Northwest. Salmon runs. I've caught salmon in my hands as they worked their tails off getting up a 2' wide 2" deep intermittent swale. I put him back right away. The only dudes allowed to mess with rivers and creeks are beavers and even they are being managed, now.
Have talked with others that have creeks and streams on their properties about landscaping and most had brutal restrictions. Which is a good thing, really. There are a lot of filthy uneducated people in this country that will easily dump pesticide waste into rivers, trash.
Call your Cooperative Extension Service first. Don't give them any information about you just ask questions. They should know the rules in your area. Then call your County Buildings and Code unless you live within City limits. If you live in an HOA (Home Owner Association), check out their rules as well. Don't tell anyone your address if you can get away with it. They might need to look your property up but they should be able to get by with the AREA, the NAME of the creek. To be forearmed is to be forewarned.
Ponds are an awful lot of work. Be nice if you could use that creek's water but I think that is a huge no - no. Tap water is very toxic to fish (and humans). If your other source of water is water from your municipality, that water should be used for bathing and washing clothes, not for drinking, cooking or aquariums. Hydrofluorosilicic acid plus mercury, plus arsenic, plus lead. I am not kidding. This is also called fluoride and there is not one study that shows this stuff is good for teeth and it is even worse for our brains and bones.
I am thinking you want fish? Koi? The evaporation formula for a body of water is ENORMOUS. My company constructed this humongous waterfall and pool system for some well-off people. TWO layers of pond fabric, never just one. This water fall was beautiful, not many are! We make sure there is no leak no way for water to bounce off a rock and past the fabric underneath cobble, boulders and sand. Concrete was used to secure the entire waterway.
After a couple of months the clients called us to tell us that their water bill was in the thousands!! My boss and cohorts went to find a place to go sleep. They thought as I did that there was a leak and the ONLY way to fix a water feature leak is to completely tear it out and start over. yay.
I looked up the formula for evaporation. I redid the figures over and over and had my boss and others go through the process. I've never seen big men cry all at once. The formula produced the SAME results as the extra water the client's were paying for. A BIG WHEW. (We are talking a 50 foot water fall run and 2 huge pools) with REAL 4 and 5 men boulders!
When clients have a well then I will consider ponds or a short water fall. Now mosquitoes are a big big deal carrying all kinds of NEW diseases. My favorite water feature is fairly maintenance free, gives all the SOUND of water, and when turned off there is no evaporation whatsoever. I call them Artesian Wells.
A big hole is dug in the ground with the amount of reservoir necessary. Pond liner X2, cobble, drain cobble, a 5 gallon plastic bucket for the pump, sensors for the water amount, landscape fabric on top with cobble on top of that plus Mexican River rock...When you turn on the pump the water squirts out of the cobble and splashes down on the cobble. LOOKS like water, sounds like water and is almost no maintenance. I've done these Artesian Fountains in STEREO. No fish, but unless you've raised fish in ponds you have no idea the work and worry! Raccoons, Blue Heron, Eagles, Osprey (grins), Raccoons are the absolute worst and they will find your pond and your fish no matter if you are deep in a city!
Our water from our taps is so toxic I am unbelieving people don't care. Chlorine now is different. It isn't the normal chlorine, it is chloromine in our water.
chlorine versus chloromine
Penman Evaporation Formula