Client:
Osceola County Rural Water

Sutherland, IA

Key Features:

  • Located 2 new well sites in the original search area
  • Identified a 70’ deep vein of gravel on State owned ground

Key Experience:

  • Used Surface Resistivity Testing to Explore 320 acres in 4 days
  • Access public access state land

Search for High Capacity Wells

As the Little Sioux River winds through the O’Brien County, it passes through a narrow valley with a shallow alluviale aquifer where Osceola County Rural Water has drawn water for years.  The depths and quality of sands and gravels is highly variable throughout this valley.  OCRWS rapid growth in water demands had pushed their existing wells to the limit, and it was now time to start looking for additional water supply.

The river valley in this area is very narrow, but potential well sites were limited by the size of the floodway and land owners in the valley who were less than cooperative.  OCRWS was eventually able to secure an option to purchase on nearly 2 quarter sections of ground, but with so much land to cover, traditional exploration methods using a drilling rig would be expensive and possibly miss highly productive areas.

DGR Engineering partnered with WSP to perform 4 days of surface resistivity testing to give multiple cross section “snap shots” of the aquifer thicknesses in the area.  With field results available in the field instantaneously, we were able to quickly dismiss large sections of the exploration areas and focus on areas of high potential.  We were even able to access public access state land at the last minute to expand our search.  We were able to do this without any permits, due to the non-evasive nature of the testing.

In the end, our team located 2 new well sites in the original search area.  We were also able to identify a 70’ deep vein of gravel on State owned ground, nearly double what we found anywhere else in the search.  Physical drilling in these locations confirmed the results, and now we are in the final stages of the necessary state permits to drill two new wells on State ground, which will be the most productive wells OCRWS has in the valley.

Featured Projects

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Site Development

DGR Engineering (DGR) worked with the City and the project architect for all aspects of the project including topographic survey, site design, construction survey, construction observation and administration.

Site Development
Sioux City, Iowa

Sanitary Sewer Rehabilitation

The project was bid and came in under budget. Manhole lids were raised to provide better access in some areas, and rehabilitation of the sewer system was completed to give another 50 years of life to the City’s much-needed infrastructure.

Sanitary Sewer Rehabilitation
Rembrandt, IA

Wastewater Treatment Facility

MBBR technology was chosen based on cost, operational flexibility and most importantly, limited land availability.

Wastewater Treatment Facility
Sanborn, IA

Floodplain Analysis

DGR employed a Geographic Information System (GIS) in conjunction with the U.S. Army Corps of Engineers to first determine the 100-year flood elevations and delineate the floodway boundaries.

Floodplain Analysis
Sutherland, IA

Distribution Conversion

Due to concerns with the age and condition of the structures, along with safety clearances to energized equipment and conductors, a project was undertaken to replace the old infrastructure with new underground lines and associated padmount equipment.

Distribution Conversion
Redwood Falls, MN

Street & Utility Improvements

Morningside Avenue was reconstructed totaling approximately 1,300 linear feet. The project included new sanitary sewer, water main, storm sewer, fiber conduits, decorative street lighting, and 9-inch concrete paving with colored concrete sidewalks.

Street & Utility Improvements
Sioux City, IA