It can be asking a lot but depending on what your trying to control, but it can be done. If your talking about weeds, a good spraying can control them depending on the spot. Timing of draw down really helps me out and will suppress some species and weeds. I manage for smartweed in most of my spots with wild millet mixed in some of these areas along with a few other desirable species scattered through out some of these spots. So, i do an early slow draw down, this early slow draw down helps with this type of management and species control. Some spots i have wild rice which is an entirely different management practice. So, timing and speed of draw down combined with some spraying (if needed) on focused areas instead of spraying the entire area works for me. I like supplemental planting of Jap millet as well in areas where nothing is really growing like on mud flats where weeds or less desirable species may pop up. Jap millet it's self "can" be a weed control. I use it to keep less desirable species off these mud flats by planting Jap millet a more desirable species. It can get pretty detailed and varies depending on the area and species your managing for, but this is what works for me and has worked for many years. There's a lot of different management practices but knowing what you have, your area and growing season, and what your managing for will dictate which practices to use. Basically having a management plan figured out before jumping in will save a lot of time and money.