In January 1916, Chula Vista was impacted by the Hatfield Flood, which was named after Charles Hatfield, when the Lower Otay Dam collapsed flooding the valley surrounding the Otay River; up to fifty people died in the flood. Later in 1916, the Hercules Powder Company opened a 30-acre bayfront site, now known as Gunpowder point, which produced substances used to make cordite, a gun propellant used extensively by the British Armed Forces during World War I. In 1920, the San Diego Country Club opened in Chula Vista, with its clubhouse designed by Richard Requa who had previously worked on the California Pacific International Exposition.</ref> In 1925, aviation began in Chula Vista, with the Tyce School of Aviation, operating the Chula Vista Airport.</ref> In 1926, the salt works purchased Rancho Janal and grew barley and lima beans.