Projects by Type:
Hydrologic/Hydraulic | Infiltration | Monitoring | Natural Resource Management
Hydrologic/Hydraulic
Wilmes Lake Overflow Study. HDR Engineering, Inc. December 2007.
This memorandum is supplemental to the SWWD Storm Water Modeling Report dated July 2006. The conclusion is consistent with that report; Non-structural improvements are recommended to mitigate potential flood damages at Wilmes Lake. The results indicate that for the standard design event, there is minimal to no reduction at Wilmes Lake and there are downstream impacts at Lakeview Park Pond and at Powers Lake if overflow from Wilmes Lake is conveyed to these locations. Additionally, the benefits gained from an improved overflow for events larger than the design event are minimal. There are safety considerations to the overland flow options that need to be carefully evaluated. The Flood Proofing Grant program that the City of Woodbury is planning is a good example of a non-structural change and will provide the optimum solutions for protection from flooding at Wilmes Lake.
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Stormwater Modeling Report. HDR. August, 2006.
The Wilmes Lake Watershed and sub-watersheds comprise the Northern Watershed of the South Washington Watershed District (SWWD). This watershed includes those areas that are tributary to Wilmes Lake, and ultimately, Bailey Lake in the City of Woodbury. During October 4-5, 2005 (October storm), a large storm over this watershed caused high water levels throughout the northern SWWD watershed, including Wilmes Lake. The storm’s intensity and overall volume exceeded the traditional design storm for the existing drainage system. This report analyzes the storm events, calibrates the model, and evaluates structural and non-structural options to provide local relief.
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Stormwater Modeling Report, West Draw Subwatershed. HDR. July, 2005
The SWWD initiated this study to quantify the flood risk and identify potential solutions to minimize flood damage potential. The West Draw Subwatershed is undergoing active suburban development. The purpose of the study is to establish the existing drainage patterns and evaluate the inter-community flow values based upon the as-built condition and currently planned projects. Of particular importance to the communities is inter-community flow between Woodbury and Cottage Grove, required storage volumes to achieve the desired flow, and the downstream drainage concerns at Hamlet Park Pond and Highway 61.
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Flood Damage Reduction Report Wilmes Lake Subdistrict. HDR. October, 2003
The purpose of this study of the Wilmes Lake Subwatershed was to quantify the flood risk and identify potential solutions to minimize flood damage potential. The report includes a GIS based hydrologic and hydraulic model of the Wilmes Lake Subwatershed, identification of subwatersheds that have a significant impact on Wilmes Lake, and identification of locations where flooding poses a hazard to homes and property. The baseline modeling demonstrated that the greatest potential adverse impact on Wilmes Lake is due to the constructed detention basins located throughout the subwatershed releasing runoff volume to Wilmes Lake within the same timeframe.
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Engineer’s Report – Central Draw Project and Flood Storage Area Maps – Final. HDR. June, 2002
The purpose of this report was to present a project to correct existing flooding conditions and identify associated flood storage areas in the communities upstream of Bailey Lake. Hydrologic and hydraulic modeling was used to assess existing conditions of the storm water system. The proposed project provides a principle outlet to the Mississippi River capable of managing the excess runoff associated with a 100-year 24-hour event under existing conditions.
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Infiltration
Guidance on Specific Infiltration Techniques. Emmons & Olivier Resources. April, 2002
Contents: This guidance document supplies the SWWD with a number of tools the District can use for the implementation of its volume control standards. It includes six fact sheets containing the definitions of volume control techniques, general design, construction and maintenance criteria diagrams and examples.
Relevance: These documents provide tools for the District to guide future infiltration projects and development of design criteria.
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2005 Infiltration Monitoring Program Final Report. EOR. Feb. 2006
Contents: The SWWD has been monitoring infiltration as part of the Infiltration Management Study initiated in 1997. These documents contain the methodology and results as well as a summary of infiltration rates and analysis, conclusions and recommendations for the infiltration of groundwater.
Relevance: These documents provide summaries of data for guidance of the infiltration of groundwater. The reports are useful for reference in developing design criteria for the District.
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Past Infiltration Monitoring Reports, by Emmons & Olivier Resources (EOR):
2004 Infiltration Monitoring Report. EOR. Feb. 2005 (6.6mb)
2003 Infiltration Monitoring Report. EOR. Feb. 2004 (3.4mb)
2002 Infiltration Monitoring Report. EOR. Mar. 2003
2001 Infiltration Monitoring Report. EOR. Nov. 2001 (1.0mb)
2000 Infiltration Monitoring Report. EOR. Nov. 2001 (1.0mb)
South Washington Watershed District Infiltration Management Study Phase II Report. Emmons & Olivier Resources. November, 2001
Contents: This document includes the data collection, monitoring, analysis, and modeling for the purpose of evaluating the importance of infiltration as a stormwater management tool. The data used in this report is from 8 monitoring wells at 5 basins that the SWWD installed in 1998. The City of Woodbury also samples 3 wells in the vicinity of CD-P85 for water quality and groundwater level. This report examines the effects of stormwater infiltration on groundwater quality, level, and environmental resources.
Relevance: This report discusses the benefits and impacts of stormwater infiltration on groundwater quality and level. This report is useful for reference in developing design criteria for the District.
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Monitoring
Watershed Monitoring Reports. Washington Conservation District (WCD)
Contents: These documents contain a summary of methods and results for various surface water monitoring efforts by the Washington Conservation District (WCD). Generally, data is presented with respect to 8 lake levels, groundwater levels at 7 stations; stream flow discharge rate, volume and quality, runoff discharge rate and volume, precipitation; and, lake water quality for Armstrong and Powers Lakes. Discussion and interpretation of the results was outside the scope of the documents.
Relevance: These documents provide data for future analysis (at the discretion of the SWWD).
2006 South Washington Watershed District Monitoring. WCD. May. 2007.
2005 South Washington Watershed District Monitoring. WCD. Apr. 2006.
2004 South Washington Watershed District Monitoring. WCD. Feb. 2005.
2003 South Washington Watershed District Monitoring. WCD. Apr. 2004.
2002 South Washington Watershed District Monitoring. WCD. Mar. 2003.
2001 South Washington Watershed District Monitoring. WCD. Feb. 2002.
2000 South Washington Watershed District Monitoring. WCD. May 2001.
2003-2004 Frost/Snow Monitoring Report. Washington Conservation District. Aug. 2003.
Contents: At the request of the South Washington Watershed District (SWWD), the Washington Conservation District (WCD) conducted frost/snow monitoring at fifteen existing frost monitoring sites (Cottage Grove Ravine Park, Bailey Lift Station, CDP-85 locations, CDP-86 locations, and two new frost/snow monitoring sites at the center of CDP-85 (north and south halves). This report summarizes the methods and results for monitoring conducted from November 24, 2004 to March 26, 2004.
Relevance: This report provides data for future analysis (at the discretion of the SWWD).
Natural Resource Management
Comprehensive Lake Management Plan for Ravine Lake, Washington County, Minnesota. Steve McComas, Blue Water Science. January 2003.
This lake management plan was prepared based on the results from a comprehensive study conducted from 2000 – 2002. The study found that while the lake is nutrient-enriched, there are healthy vegetative communities (both aquatic and shoreline) which show minimal signs of disturbance. Watershed and lake response modeling indicated that it will be difficult to attain low in-lake nutrient levels even under minimally impacted reference conditions. The findings suggest the lake is desirable for wildlife, habitat, and passive recreation. Seven management options were recommended by the study.
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SWWD CD-P86 Natural Resources Management Plan. Emmons & Olivier Resources. July 19, 2002.
The goal of this Natural Resources Management Plan is to develop an ecologically-based management approach that improves, protects and maintains the ecological functions of CDP-86. This natural depression is a link in the Greenway Corridor. The CDP-86 area provides the critical connection between the City of Woodbury’s trunk stormwater system and a natural drainageway through Cottage Grove that discharges into the Mississippi River. The plan establishes a framework for future restoration efforts on portions of the site including areas both inside and outside of the conservation easement.
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Draft Comprehensive Wetland Management Plan. Emmons & Olivier Resources, 2002.
The draft comprehensive wetland management plan provides an inventory, functional assessment, and management classifications for all know wetlands within the watershed. There are also specific management standards such as stormwater susceptibility and stormwater protection standards for protecting these wetlands. This wetland management plan assists the administration of the Wetland Conservation Act and designates wetland restoration/enhancements opportunities.
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SWWD Greenway Corridor Plan. Emmons & Olivier Resources. July, 2000.
Summary Coming…
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Powers Lake Management Plan, Washington County, Minnesota. Bonestroo, Rosene, Anderlik and Associates. March 2000.
This lake management plan involved a broad characterization of the existing conditions of the Powers Lake. The plan focused on illustrating the water quality of Powers Lake, and discussed impacts from future development. Ultimate conditions for the lake include a significantly increased drainage area and urbanized land use. A recommended list of projects was developed which included construction site management actions, lake projects, and public information.
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Projects by Type:
Hydrologic/Hydraulic | Infiltration | Monitoring | Natural Resource Management