facility in the district until 2013, when it consolidated operations in its new corporate campus in Spring. The Energy Corridor experienced extensive inland flooding from Hurricane Harvey in August and September 2017 after historic rainfall exceeded the retention capacity of the Addicks and Barker reservoirs. The United States Army Corps of Engineers was forced to maximize discharge out of the reservoirs into Buffalo Bayou to protect the structural integrity of the dams, causing extensive downstream flooding of residential and commercial areas throughout the district, particularly along the Eldridge Parkway corridor. Economy Historically, the Energy Corridor has been one of Houston's strongest office markets. The district is the second-largest employment center in the region with more than 94,000 employees and over 300 companies. The Energy Corridor is home to the national or international headquarters of the following companies: Becks Prime BP America at Westlake Park ConocoPhillips Citgo Equinor Foster Wheeler Gulf States Toyota McDermott International PCL Construction SBM Offshore USA Sysco Technip USA Wood Group WorleyParsons Kiewit Corporation Shell Oil Company, the fifth-largest employer in the Energy Corridor, operates a large campus in the district. Dow Chemical Company and Sonangol USA have offices in the area. Transportation The Metropolitan Transit Authority of Harris County, Texas (METRO) provides public transportation to the area. Line 75, originally known as the Energy Corridor Connector, operates during weekdays. Commuters from Downtown Houston and Midtown Houston can connect to the 75 connector via 228 Addicks and 229 Kingsland/Addicks through the Addicks Park and Ride. The 75 connector also connects with routes along Westheimer Road and Memorial Drive. In January 2011, the name of the route was changed to 75 Eldridge Crosstown, and the southern terminus of the line was extended to Mission Bend Park and Ride, enabling more convenient connections with the Westchase district and the New Chinatown area. Two general aviation airports serve the Energy Corridor: West Houston Airport, near Addicks Reservoir, and Houston Executive Airport in unincorporated Waller County. The latter was built to serve employees of firms in the Energy Corridor. Two-thirds of the district's employees live within a "commute zone" spread across northern Fort Bend County, western Harris County, and southern Waller County. Education Public schools The southern, western and eastern areas of the Energy Corridor are served by Houston Independent School District, Katy Independent School District, and Spring Branch Independent School District, respectively. Houston ISD residents are zoned to Ray K.