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

Context paragraphs:
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.

Nad Ali District: Nad Ali or Nad-e Ali is a district in Helmand Province, Afghanistan.  Marja is an unincorporated agricultural district in Nad Ali.  The area is irrigated by the Helmand and Arghandab Valley Authority.  A small town of the same name lies 11km to the west of the Helmand River, at the coordinates shown at the top of the page.

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.

Sangin District: Sangin is a district in the east of Helmand Province, Afghanistan.  Its population was reported at 58,100 in 2012, all of which belong to Pashtun ethnic group.  The district centre is the town of Sangin.  The area is irrigated by the Helmand and Arghandab Valley Authority.

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.

Panjwayi District: Panjwayi (also spelled Panjwaye, Panjwaii, Panjway, Panjwa'i, or Panjwai) is a district in Kandahar Province, Afghanistan.  It is widely considered the spiritual home of the Taliban and is located about 35 km west of Kandahar.  The district borders Helmand Province to the southwest, Maywand District to the west, Zharay District to the north, Arghandab, Kandahar and Daman districts to the east and Reg District to the south.  The population was around 77,200 in 2006, most of which are peasants and poorly educated due to non-availability of schools.  The district center is Bazar-e Panjwayi, located in the northern part of the district.  The area is irrigated by the Helmand and Arghandab Valley Authority.

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.

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.

Daman District, Afghanistan: Daman district is situated in the central part of the Kandahar Province, Afghanistan.  It borders Panjwai and Kandahar districts to the west, Shah Wali Kot District to the north, Zabul Province to the northeast, Arghistan and Spin Boldak districts to the east and Reg District to the south.  The population is 30,700 (2006).  The center is the village of Daman, located in the central part of the district.  The area is irrigated by the Helmand and Arghandab Valley Authority.

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.

Supporting paragraphs: Helmand and Arghandab Valley Authority Tennessee Valley Authority
Answer: George W. Norris