The Friends of the Sangamon Valley’s surface water quality study at Nipper Wildlife Sanctuary is underway. The Friends are collecting surface water chemistry data and information on water levels and flow into and out of the wetlands to quantify the nutrient load moving through the wetlands and what this might mean for replicating wetland restoration on other properties.
Besides providing great habitat, wetlands are thought to be beneficial for trapping and controlling nutrients and agri- cultural-related compounds such as ammonia, nitrogen, and phosphorus. Wetland sediments and wetland vegetation can trap these nutrients and keep them from entering streams, rivers, and lakes at excessive or harmful concentrations.
The five wetlands at Nipper Wildlife Sanctuary treat runoff and discharge from adjacent agricultural field drainage tiles and from a 70-acre drainage area. In 2016, the City of Springfield and the Sangamon County Soil and Water Conservation District studied nitrate in surface water throughout the watershed. The Nipper wetlands were included in the study, with surface water samples taken in the first wetland (i.e., southernmost, the pond at the nature center) and at the downstream outlet of the fifth wetland (i.e., northernmost, near Lick Creek). The results indicated a significant reduction of nitrates, apparently due to biofiltration and plant uptake.
To build on this, the Friends of the Sangamon Valley initiated a two-year study of the wetlands’ water quality. Funded by the Nipper Foundation and the Brandt Foundation, the Friends contracted with Northwater Consulting of Springfield to develop the study, conduct the ongoing monitoring and provide a report interpreting the results.
Water quality samples are being collected and analyzed in a joint effort with Northwater and Friends volunteers. Many of the samples will be analyzed at Nipper where an on-site analytical lab has been set up. Samples will periodically be sent to Prairie Analytical in Springfield as a quality control check. Samples are being analyzed for ammonia, nitrogen, nitrate, nitrite, and total and dissolved phosphorus. Water levels are also being tracked with staff gauges. Groundwater wells have been installed and will provide data to track groundwater elevations, flow direction and flow velocity.
Samples will be collected at least monthly. And to best determine the inputs coming into the wetlands, samples need to be collected during storm events when runoff is occurring into the wetlands. It’s tough to mobilize a sampling team on short notice, but this will sort itself out as we get more proficient.
Thanks to the Nipper and Brandt Foundations, the Friends has been able to purchase lab equipment and supplies. Having our own resources to conduct such studies will help build our capacity to con- duct similar studies with other streams and wetlands in our watershed.
The study is just starting and the Friends are still learning the ropes. Northwater’s Jeff Boeckler and Sarah Lindholm will continue to be involved in data collection and consulting. This year is shaping up to be a dry run, so to speak, and we will be able to train some people up once we smooth out the routine. We’ll provide future updates as the project progresses.
Get a tour of Nipper Wildlife Sanctuary Friday 5 October 2018. A sunset tour of Nipper starts at 5:30 p.m., the opening act for a benefit concert by Ben Bedford at Sheedy Shores Winery, south of Loami. Join in the evening celebration of our volunteers and donors, details on our Facebook event page.