Question: Who was the Senator behind the corporation that served as the model for the Helmand and Arghandab Valley Authority?

full_context: Document 1: Kajaki Dam: The Kajakai Dam is one of the two major hydroelectric power dams of Helmand province in southern Afghanistan. The dam is located on the Helmand River 100 miles (161 km) north-west of Kandahar and is operated by the Helmand and Arghandab Valley Authority. It has a dual function, to provide electricity and to irrigate some 650,000 acres (1800 km²) of an otherwise arid land. Water discharging from the dam traverses some 300 miles (500 km) of downstream irrigation canals feeding farmland. It currently produces 33 megawatts of electricity.
Document 2: Helmand and Arghandab Valley Authority: The Helmand and Arghandab Valley Authority (HAVA) based in Lashkar Gah, Afghanistan, originally named the Helmand Valley Authority (HVA) until its expansion in 1965, was established on December 4, 1952 as an agency of the Afghan Government. The agency was modelled on the Tennessee Valley Authority in the United States, with a remit covering lands in Farah Province, Ghazni Province, Helmand Province, Herat Province, and Kandahar Province.
Document 3: Arghandab River: Arghandab is a river in Afghanistan, about 400 km in length. It rises in the Hazarajat country north-west of Ghazni, and flows south-west falls into the Helmand 30 km below Girishk. In its lower course it is much used for irrigation, under the control of the Helmand and Arghandab Valley Authority, and the valley is cultivated and populous; yet the water is said to be somewhat brackish. It is doubtful whether the ancient Arachotus is to be identified with the Arghandab or with its chief confluent the Tarnak, which joins it on the left 50 km southwest of Kandahar. The Tarnak, which flows south of Kandahar, is much shorter (length about 320 km or 200 miles) and less copious.
Document 4: Kentucky Dam: Kentucky Dam is a hydroelectric dam on the Tennessee River on the county line between Livingston and Marshall counties in the U.S. state of Kentucky. The dam is the lowermost of nine dams on the river owned and operated by the Tennessee Valley Authority, which built the dam in the late 1930s and early 1940s to improve navigation on the lower part of the river and reduce flooding on the lower Ohio and Mississippi rivers. It was a major project initiated during the New Deal of President Franklin D. Roosevelt's administration, to invest in infrastructure to benefit the country. The dam impounds the Kentucky Lake of 160000 acre , which is the largest of TVA's reservoirs and the largest artificial lake by area in the Eastern United States.
Document 5: Share Our Wealth: Share The Wealth was a movement begun in February 1934, during the Great Depression, by Huey Long, a governor and later United States Senator from Louisiana. Huey Long first proposed the plan in a national radio address, which is now referred to as the "Share Our Wealth Speech".
Document 6: Arachosia: Arachosia is the Hellenized name of an ancient satrapy in the eastern part of the Achaemenid, Seleucid, Parthian, Greco-Bactrian, and Indo-Scythian empires. Arachosia was centred on the Arghandab valley in modern-day southern Afghanistan, although its influence extended east to as far as the Indus River in modern-day Pakistan. The main river of Arachosia was called "Arachōtós", now known as the Arghandab River, a tributary of the Helmand River. The Greek term "Arachosia" corresponds to the Aryan land of "Harauti" which was around modern-day Helmand. The Arachosian capital or metropolis was called Alexandria Arachosia or Alexandropolis and lay in what is today Kandahar in Afghanistan. Arachosia was a part of the region of ancient Ariana.
Document 7: Norris Dam: Norris Dam is a hydroelectric and flood control structure located on the Clinch River in Anderson County and Campbell County, Tennessee, United States. Its construction in the mid-1930s was the first major project for the Tennessee Valley Authority, which had been created in 1933 to bring economic development to the region and control the rampant flooding that had long plagued the Tennessee Valley. The dam was named in honor of Nebraska Senator George Norris (1861–1944), a longtime supporter of government-owned power in general, and supporter of TVA in particular. The project infrastructure was listed on the National Register of Historic Places in 2016.
Document 8: Public Works Administration: Public Works Administration (PWA), part of the New Deal of 1933 was a large-scale public works construction agency in the United States headed by Secretary of the Interior Harold L. Ickes. It was created by the National Industrial Recovery Act in June 1933 in response to the Great Depression. It built large-scale public works such as dams, bridges, hospitals, and schools. Its goals were to spend $3.3 billion in the first year, and $6 billion in all, to provide employment, stabilize purchasing power, and help revive the economy. Most of the spending came in two waves in 1933-35, and again in 1938. Originally called the Federal Emergency Administration of Public Works, it was renamed the Public Works Administration in 1935 and shut down in 1944.
Document 9: Boghra Irrigation Canal: The Boghra Irrigation Canal is a canal some 155 kilometres long in central Afghanistan in Helmand Province, serving to divert water from the Helmand River and the Arghandab for farmland. It was built in the 1950s and is controlled by the Helmand and Arghandab Valley Authority.
Document 10: Civilian Conservation Corps: The Civilian Conservation Corps (CCC) was a public work relief program that operated from 1933 to 1942 in the United States for unemployed, unmarried men from relief families as part of the New Deal. Originally for young men ages 18–25, it was eventually expanded to young men ages 17–28. Robert Fechner was the first director of the agency, succeeded by James McEntee following Fechner's death. The CCC was a major part of President Franklin D. Roosevelt's New Deal that provided unskilled manual labor jobs related to the conservation and development of natural resources in rural lands owned by federal, state and local governments. The CCC was designed to provide jobs for young men, and to relieve families who had difficulty finding jobs during the Great Depression in the United States. At the same time, it implemented a general natural resource conservation program in every state and territory. Maximum enrollment at any one time was 300,000. Over the course of its nine years in operation, 3 million young men participated in the CCC, which provided them with shelter, clothing, and food, together with a small wage of $30 (about $547 in 2015) a month ($25 of which had to be sent home to their families).
Document 11: Helmand Province: Helmand ( ; Pashto/Dari: هلمند), also known as Hillmand, and, in ancient times, as Hermand and Hethumand is one of the 34 provinces of Afghanistan, in the south of the country. It is the largest province by area, covering 58,584 km2 area. The province contains 13 districts, encompassing over 1,000 villages, and roughly 879,500 settled people. Lashkar Gah serves as the provincial capital.
Document 12: Norris Lake (Tennessee): Norris Lake is a reservoir that is located in Anderson, Campbell, Claiborne, Grainger, and Union counties in Tennessee. The lake was created by the Norris Dam at the Cove Creek Site on the Clinch River in 1936 by the TVA for flood control. The dam was the first major project taken on by the TVA. The lake, dam and the town of Norris, Tennessee are named after George W Norris, who was a United States senator from Nebraska and wrote the legislation that created the TVA.
Document 13: Fannie Mae: The Federal National Mortgage Association (FNMA), commonly known as Fannie Mae, is a United States government-sponsored enterprise (GSE) and, since 1968, a publicly traded company. Founded in 1938 during the Great Depression as part of the New Deal, the corporation's purpose is to expand the secondary mortgage market by securitizing mortgages in the form of mortgage-backed securities (MBS), allowing lenders to reinvest their assets into more lending and in effect increasing the number of lenders in the mortgage market by reducing the reliance on locally based savings and loan associations (or "thrifts"). Its brother organization is the Federal Home Loan Mortgage Corporation (FHLMC), better known as Freddie Mac.
Document 14: Tennessee Valley Authority: The Tennessee Valley Authority (TVA) is a federally owned corporation in the United States created by congressional charter on May 18, 1933 to provide navigation, flood control, electricity generation, fertilizer manufacturing, and economic development to the Tennessee Valley, a region particularly affected by the Great Depression. The enterprise was a result of the efforts of Senator George W. Norris of Nebraska. TVA was envisioned not only as a provider, but also as a regional economic development agency that would use federal experts and electricity to rapidly modernize the region's economy and society.
Document 15: Ahandara: Ahandara is a valley and settlement in Takhar Province on the Kunduz River. The valley is crossed by the road from Kunduz to Faizabad, and located about 22 miles west of Teshkhan. There is also a village by the same name in Badakhshan Province, located on the road from Taloqan to Faizabad, about 15 miles west of the Lataband Pass.
ground_truth: George W. Norris