[미국] 로스앤젤레스의 유역 프로젝트, ISI상 수상

지속가능한 사회기반 시설 협회(ISI)는 로스앤젤레스의 선밸리 유역 다이익 프로젝트(WMBP)가 Envision™ 기반시설 등급제의 플래티넘 상을 수상했다고 밝혔다. 로스앤젤레스는 Envision™ 기반시설 등급제에서 지속가능한 다이익 기반시설로부터 지역사회의 삶의 질을 성공적으로 향상하도록 하는 노력을 인정받아 Envision system의 최고 높은 등급을 받았다.

로스앤젤레스의 공공사업부는 관리 기관으로써 선밸리 유역의 우수관리를 위한 첫 시험 프로젝트인 WMBP의 개발을 위해 협력과 지도력을 제공했다. 이 프로젝트는 홍수 보호를 제공하고 유역건강을 향상시킨다. 또한, 공공용지와 여과 기회를 증가시키고 야생 서식지를 증가시키고 개선한다.

The Institute for Sustainable Infrastructure (ISI) has announced that the Sun Valley Watershed Multi-Benefit Project (WMBP) in Los Angeles County, Calif., has earned the Envision™ infrastructure rating system's Platinum award -- the highest level attainable in the Envision system -- for its efforts in successfully improving community quality of life by providing sustainable multi-benefit infrastructure.

The County of Los Angeles Department of Public Works, as the managing agency, provided leadership and coordination in the development of the WMBP, which is a first-of-its-kind venture geared to managing stormwater for the Sun Valley Watershed. The project provides flood protection, improved watershed health, increased open space and recreational opportunities, and increased wildlife habitat. The project also received 67 percent of the Department's applicable Envision credits -- the most any project has received to date from the Envision infrastructure rating system.

The project consists of several completed components, including Tuxford Green, Sun Valley Park Drain and Infiltration System, Elmer Avenue Neighborhood Retrofit, and the Elmer Avenue Paseo. Other components include the Rory M. Shaw Wetlands Park and the Sun Valley Watershed Upper Storm Drain System and Recycled Water Line, which are in the final design stage. The Valley Steam Plant and the Whitnall Powerline Easement components are in the conceptual design stage.

"The Sun Valley project received the ISI Envision Platinum award because of its high levels of restorative qualities applied in a previously underdeveloped area," said ISI President and CEO, William Bertera. "Sun Valley's high rating also reflects remarkable innovation -- not only does the project mitigate flooding in an area that has historically had issues with severe floods, but it also retains stormwater in a manner that fulfills local water needs and reduces stormwater pollution all at the same time."

The Envision system measures sustainability in infrastructure projects through the measurement of five categories: Quality of Life (QL), Leadership (LD), Natural World (NW), Resource Allocation (RA), and Climate and Risk (CR) that contribute to overall credits for the positive social, economic and environmental impacts in a community in the planning, design and construction of infrastructure projects. The highest-rated project categories that Sun Valley scored using the Envision rating system included:

Quality of Life: The proposed project rated highly in the QL category. In relation to the stormwater and flood protection, the project included the transformation of an inert landfill to a flood control detention basin, wetland and park that greatly benefits the local community at many levels. The project eliminates local street flooding during moderate storm events, which enhances public safety and health. The project also includes stormwater quality improvement measures, such as wetlands and trash exclusion devices, and will provide the community with access to much-needed public space for social interaction and recreation.

Leadership: Los Angeles County provided leadership and coordination in developing the WMBP. The implementation of the plan is dependent on strong partnerships and collaborations between various agencies, environmental groups, political offices, and the community. The project components were developed and designed based on key stakeholder involvement. In some instances, the community had direct input in the project design, such as choosing the recreational amenities in the public park. Los Angeles County performed extensive outreach, purchasing a landfill site, incorporating sustainable design and improving community living. A long-term monitoring and maintenance plan was also implemented effectively to maintain the viability and function of the project.

Natural World: The project scored highly in the NW category primarily due to the main scope of the work: restoration of floodplain functions and the management of stormwater. The construction of detention basins and wetlands will store and treat stormwater respectively from the affected watershed prior to ground infiltration for recharge of local aquifers. The project also restores native habitat to the project site with native landscaping and incorporates wetlands, infiltration trenches and basins, bioswales, and treatment trains to reduce pollutant load concentrations prior to ground infiltration. Best management practices (BMPs) are stipulated and implemented during construction to prevent surface runoff from the site. A detailed hazardous material removal plan was developed to contain, handle and remove contaminated material safely from the project site.

Resource Allocation: The project promotes water conservation by capturing, treating and infiltrating stormwater to local aquifers to protect freshwater availability for the region. Native plants are used throughout the project to minimize irrigation usage. A recycled water line is proposed to help irrigate the Rory M. Shaw Wetlands Park component of the project.

Climate and Risk: A statewide climate impact assessment study, the California Adaptation Planning Guide by the California Natural Resource Agency, states adaptation considerations for the South Coast Region that include: "sea level rise, increased wildfire risk, public health, socioeconomic and equality impact, and water supply." The WMBP prepares for long-term adaptability for climate variations, such as drought and floods, by adjusting the operational levels of the detention and infiltration basins. The transformation of a landfill to the functional wetlands and park will substantially improve community livability. Dust and pollutants that are created from the unloading of waste material will cease to exist. Haul traffic of diesel trucks used to service the landfill site will be eliminated, and the air quality will improve as a result.

[출처 = Water World / 2014년 8월 28일]