Posts Tagged ‘Des Moines River’April 25, 2013
Here’s an exciting opportunity for river enthusiasts! Plan to participate in Iowa Rivers Revival’s “Master River Steward Program” in the Des Moines/Raccoon River Watershed. This will be Iowa Rivers Revival’s second year offering this program. The eight week course, beginning May 14, will focus on riverine systems, including skills to paddle and navigate rivers, restore aquatic habitat, improve water quality, and understand policies related to floodplains, river protection and restoration.
The “Master River Steward Program” will build on a network of river experts in various partner agencies and organizations. It will help adult learners collaborate to protect and improve Iowa’s rivers, so that current and future generations can enjoy these resources. Visit Iowa Rivers Revival’s website to view an outline of last year’s program: http://iowarivers.org/education/river-stewards/.
Registration Cost: Participants will pay a fee of $50 which will include program materials. Participants will be expected to attend each session and there will be “homework” assignments following each class – materials will be provided. Please register by April 30, 2013.
Feedback from 2012 Pilot Participants:
- “Great class, thoroughly enjoyed each and every session.”
- “Great leadership. Great resources/readings. Great speakers. Great group.”
- “Really enjoyed class. Had zero expectations coming in. Was surprised by the amount of river experience/Project AWARE tie in. Really enjoyed meeting such passionate people. Each week gave me something to think about and discuss with co-workers.”
- “This was a fantastic program. I came in with no expectations, but left every night excited to share what I learned with others… Thanks so much for putting this together. I will become active in the stewardship of rivers at a far greater level due to this program.”
For more information and to register, contact:
Rosalyn Lehman, Executive Director
Iowa Rivers Revival
PO Box 72, Des Moines, IA 50301
Iowa Rivers Revival (IRR) is Iowa’s only statewide river education and advocacy organization committed to protecting one of our most precious natural resources – our rivers and streams. Since 2007, IRR has been working to engage individuals, organizations, communities and our government leaders in river awareness, responsibility and enjoyment in an effort to improve and enhance the condition of Iowa’s waterways – ensuring a quality, safe and lasting resource for future generations.
Water from our rivers is “hard,” meaning it has a high mineral content, especially calcium and magnesium. This is because 100 million years ago, what is now Iowa, was under the surface of the ocean, and large limestone deposits are the result. As rain water and snow melt trickles through the limestone, toward shallow groundwater and eventually into our streams, it dissolves mineral deposits. Hardness is reduced in DMWW’s treatment plants using a process called lime softening.
The river water has a high nutrient content, especially nitrate-nitrogen and phosphorous. Some of the fertilizer used for crops is washed away or enters the streams through agricultural drainage tiles. Our super-rich soils also contain a lot of natural nitrogen and phosphorous, which is liberated from the soil during cultivation. The Raccoon and Des Moines Rivers have the highest and second-highest nitrate concentrations of the 42 largest Mississippi River tributaries. DMWW operates the world’s largest nitrate removal facility at its Fleur Drive Plant.
Our rivers have a relatively high level of sediment. Erosion is a natural process that has been greatly increased by both rural and urban land uses. It’s likely that most Iowa streams ran much clearer prior to settlement than in the present day. Loss of native perennial vegetation and increased streamflows because of human modification of natural hydrology, along with changes in land use and climate, are the primary culprits for increased erosion. In addition, levees have divorced streams from their floodplains, increasing river energy during high flows. This helps the stream scour sediment from the stream bed and banks. DMWW removes about 20,000 pounds of sediment (1,400 pounds per million gallons) from the treated river water every day, so the water will be clear and safe to drink.
Although DMWW’s source waters are considered impaired, DMWW is continuously adapting its treatment processes to deliver Water You Can Trust for Life.
Watershed, catchment, and drainage basin are all the same thing: an area of land that drains to a common point. Small watersheds drain into larger watersheds in a hierarchical pattern. For example, the Mississippi River Watershed is comprised of hundreds of other smaller sub-watersheds.
The City of Des Moines is located at the bottom of two large catchments: the Raccoon and the Upper Des Moines River watersheds. These are two of the 42 largest sub-watersheds in the Mississippi River basin. Water draining from more than 5 million acres, from as far away as Jackson, MN, flows through the city. Des Moines Water Works treats water from both rivers to provide Des Moines Area residents with drinking water.
Knowledge of Iowa’s geological history and current land uses are necessary to understand each river and its water quality. Both the Raccoon and Des Moines Rivers flow through and drain the Des Moines Lobe Landform. It was here that a glacier covered the landscape only 12,000 years ago. The weather warmed and the disintegrating ice sheet formed the prairie pothole region that was once home to uncounted millions of waterfowl. After the glacier melted, the landscape was colonized by tallgrass prairie and wetland plants that helped form the region’s tremendously rich soil. The rivers ran clear and cold as rain water was naturally filtered through the perennial vegetation.
The early European settlers found the region nearly uninhabitable due to the swampy landscape and swarms of mosquitoes. A few decades after arrival, they realized that the soils formed under such conditions were ideal for the cultivation of corn. But first, large scale drainage was necessary. Networks of porous drainage pipes (now known as tile) were buried to lower the water table and dry out the soil. These were connected to constructed drainage ditches, essentially forming hundreds of new streams where none previously existed. This enormous project was mostly complete by 1920, although farmers continue to connect into and improve the system in the present day.
Constructed drainage and replacement of perennial vegetation with annual crops turned Iowa into the world’s richest agricultural region. But altering the natural hydrological system also had an impact on water quality in Iowa’s streams, this is will be discussed in the next piece in this series.