West Terre Haute, IN

Stormwater Master Plan

HWC completed a stormwater master plan for West Terre Haute, Indiana, a town with a long history of drainage and flooding problems. Several levee systems were constructed in the 1960s and 1970s to protect the town from high river stage events.

While the levee system was effective, the town’s internal (minor) drainage systems were inadequate. No comprehensive solution existed to provide positive drainage within the town when the river stage was up and the flood gates for the gravity drainage outlet pipes through the levee were closed. During Wabash River flood events, temporary pumping facilities were set up to discharge excess water.

Worthington, IN

Stormwater Improvements Study

HWC completed an IOCRA approved planning grant funded study evaluating the Town’s wastewater and stormwater infrastructure and recommending improvements to the system components for the Town of Worthington, Indiana, located in Greene County.

Regarding the stormwater analysis, first, a Neighborhood Drainage Survey was prepared, distributed, collected, compiled, and analyzed by HWC. The responses to this survey helped identify six key areas within the Town where stormwater drainage was a problem. From these results, HWC further reviewed and analyzed existing systems and developed recommended stormwater system improvements, including the installation of new storm sewers/inlets, rehabilitation of existing sewers/ditches, re-grading existing ditches, installation of new pipes under the existing railroad, construction of new outlet ditches, new drywell structures, and an overflow detention basin. HWC prioritized the improvements into phases to maximize the benefit to the Town based on the funding source. The overall recommendations of all phases had an estimated cost of approximately $2.8M. However, given the availability of Disaster Relief (DR II) funds through IOCRA in the amount of $1M, the phase recommended, based on the location and priority, was estimated at $965,000, thus allowing use of the use of the DR II $1M grant funds.

Farmersburg, IN

Stormwater Drainage Improvements

This project entailed improving stormwater drainage in the Town of Farmersbug, located along US 41 in Sullivan County, in West Central Indiana. HWC updated a previously completed stormwater drainage master plan for the community, which included over $2.5 million in stormwater handling improvements. The study phase services also included modeling of the drainage basins to verify the scoping assumptions in the study report. At the conclusion of the report, given the available DR funding available through IOCRA, HWC assisted the Town with applying for and securing a $1 million grant to construct the first phase of the stormwater improvements. During the study phase, the Town implemented a stormwater utility, which was used to fund the remainder of the recommendations included in the plan.

Terre Haute, IN

Stormwater Separation: Edgewood Grove and Oakland Subdivisions

HWC worked with the City of Terre Haute, Indiana to complete the Edgewood Grove and Oakland Stormwater Separation project. The stormwater drainage problems in the subdivisions had progressively worsened, causing the pavement, curbs, and gutters to deteriorate.

The initiation of the Brown Boulevard Extension project necessitated stormwater handling facilities to serve the new boulevard. Given their proximity to the project, the Edgewood Grove and Oakland subdivisions were combined with the improvements needed for the new boulevard project, including stormwater drainage structures throughout both neighborhoods. In addition to improving stormwater drainage, the storm sewer system also eliminated a large amount of flow from entering the City’s combined sewer system, which decreased the impact of rain events and helped mitigate the impact of combined sewer overflows.

The drainage design within the Oakland subdivision included collector storm sewers that now convey flow from the neighborhood to a new 45 CFS lift station. A 36” force main transfers flows from the station to the Thompson Ditch outlet. The storm sewer improvements within Edgewood Grove included 24”-66” sewers to collect stormwater from the neighborhood and outlets from surrounding neighborhoods. The storm sewer system discharges to Thompson Ditch via an existing 84” storm sewer that was rehabilitated as part of this project.

Because the area was disturbed with the installation of the stormwater handling facilities, additional reconstruction was completed at the public transportation areas within the subdivisions. Reconstruction included new streets, sidewalks and curbs, and a new median. The streets were also widened for improved traffic flow as part of the overall $12 million project.