Stormwater Pond Maintenance, and Wetland Management for Phosphorus Retention

(c) 1036202Reduction in phosphorus is critical because phosphate, a dissolved form of phosphorus, sustains algal and cyanobacteria growth and causes a wide range of water-quality impairments in the ponds and downstream waters including algal blooms, excess floating plants, taste, and odor problems. Many stormwater ponds and wetlands that treat stormwater appear to be less effective than expected or originally intended in phosphorus retention, a key function of these ponds in urban environments. There is evidence that many old ponds are releasing phosphorus from bottom sediments at high rates and likely exporting phosphorus to downstream surface water bodies. A major outcome of this project is a pond Assessment Tool to assess the risk of high phosphorus concentrations in ponds and sediment release of phosphorus. The tool is based on 20 ponds with detailed water quality and phosphorus release measurements and a meta-analysis of 230 ponds in the Twin Cities metro area. Other outcomes included a working definition of a constructed stormwater pond and a wetland treating stormwater in the framework of water-body regulations, the development of recommendations for stormwater pond maintenance and wetland management, and an update to the sections on the constructed stormwater ponds section of the 2009 Stormwater Maintenance BMP Guide

The Slickee Boys concert flier - 7th St. Entry, Minneapolis, Minnesota, February 3, 1986

Flier advertising a concert by the Slickee Boys, a new wave/garage rock band from Washington, D.C. The concert occurred at 7th St. Entry in Minneapolis, Minnesota on February 3, 1986

Map of Wisconsin / especially prepared for Minneapolis, St. Paul & Sault Ste. Marie Railway

On verso: Map of Soils of WisconsinColor1:1,000,00

Map of Wisconsin / especially prepared for Minneapolis, St. Paul & Sault Ste. Marie Railway.

On verso: Map of Soils of Wisconsin.Color1:1,000,00