Water levels in the tracts are regulated seasonally. In March and April, the water levels are drawn down for the summer to expose seasonal benches and mudflats. This creates foraging habitat for shorebirds. Also, by keeping water off the benches, mosquitoes are discouraged. In the fall and winter months, increased stormwater flows are directed to the wetlands. The higher levels inundate the benches, creating shallow habitat for waterfowl and wading birds. The vast areas of open water provide plenty of habitat for wintering waterfowl to raft and avoid terrestrial predators.
The Davis Wastewater Treatment Plant treats water at the secondary level that is completely compatible with the Wetlands environment. The biological processes started at the Plant continue in the Wetlands, where suspended solids and organics settle out of the water or are absorbed by plants and micro-organisms. Stormwater is conveyed directly to the Wetlands from Davis urban areas. The biological processes that first take place in Davis' drainage ponds continue in the Wetlands to help enhance the quality.
The Wetlands environment is monitored continuously to ensure its quality. Water, soil and bird eggs are frequently tested for potentially harmful constituents such as Selenium. You can help keep the Davis Wetlands healthy by making sure only clean rainwater goes into storm drains. More information about the city's Stormwater Management Plan can be found by clicking here.