In the past I have heard that the Corp of Civil Engineers at one time assisted with farmers who desired to build ponds on their property.

I do not know what services pretaining to such things they offer to the general public today.

Found listed under the Government Offices-US headings their media relations and public affairs phone number as listed in this Tulsa area phone directory is 669-7366. Engeneering & Construction number is 669-7008, and their Planning and Environmental number is listed as 669-7182.

If they no longer offer such needed services, they might know of some other reliable government agency or private contractors who can help you.

Also since you referenced desiring to design and install some wetlands, some local nature conservationalist might also be a helpful and maybe even necessary resource with which to connect.