In 2006, Caldwell Companies sought to create Towne Lake as a community where residents and services could be connected by water. Their vision included boat docks and marinas augmenting traditional walking trails to navigate a vibrant residential community. EHRA was the perfect partner to take Caldwell Companies’ vision and create this livable suburban oasis.
EHRA designed an expansion that implemented the installation of a new triplex lift station operating in conjunction with the existing duplex lift station.
EHRA worked with the District to create a comprehensive Parks Master Plan, which included recommendations for the development of over two miles of hike/bike trails adjacent to local streets, and within flood control and utility pipeline easements. The District began implementation of the Plan by prioritizing the beautification of West Road, a major arterial street that runs through the District.
EHRA planners, hydrologists and landscape architects worked together to propose an alternative use for the space, re-developing the basin into an amenity pond. EHRA carefully selected native plant materials for both their ability to survive in the harsh conditions of the basin as well as providing filtration for improved storm water quality.
Facilities requiring expansion were also common wall construction, and the EHRA team converted the facilities into aerobic digesters and sludge thickeners.
EHRA was contracted by Harris County to perform planning and design for the drainage improvements for the Tower Oaks Plaza Subdivision, located in northwest Harris County. This investigation identified drainage solutions intended to reduce the risk of structural flooding and improve resiliency in the subdivision.
Cypress Creek is the major source of flooding for the subdivision. EHRA utilized a two-dimensional analysis to determine the threshold of service that could be provided locally before Cypress Creek inundated the subdivision. The analysis revealed that the 10% annual exceedance probability event was the maximum achievable level of service for the internal drainage system. The internal drainage analysis concluded that the roadside ditch conveyance system was adequate for a two-year level of service in most locations, but the outfalls were not. EHRA then analyzed both the internal drainage system and the Tributary to Cypress Creek (K161-00-00) to determine what improvements needed to be made to achieve a ten-year level of service.
EHRA recommended the following drainage improvements:
Due to the location of the detention pond within a park and buyout area, there was extensive coordination with Precinct 3, Harris County and Harris County Flood Control to optimize detention storage while allowing for existing and proposed infrastructure within the park. During its design, EHRA put careful thought and consideration into maximizing the size and configuration of the detention pond, while minimizing the impact to the park. EHRA provided an estimate of how many trees would be impacted and went back and forth with the Precinct in collaboration to find a solution which would benefit the neighborhood with respect to drainage detention while maintaining tree coverage. In addition to these drainage improvements, EHRA recommended additional voluntary buyouts be pursued for structures within the effective 100-year floodplain for Cypress Creek.
EHRA also paid mindful attention to both schedule and cost throughout the duration of this project. When data showed two 36” Kinder Morgan pipelines crossing the project, EHRA designed a siphon for the storm sewer to take it under the gas lines and maintain 3’ of clearance. This resulted in a $3 Million cost saving and allowed the project to remain on schedule.
In 2023, EHRA completed the final construction plans for the Tower Oaks Plaza subdivision and has moved into the construction phase of this project. The construction is scheduled to start in June 2023 and be completed within 12 months.