The sanctuary was gazetted 'in order to facilitate the restoration to "ecological health" of a major north Indian river system and provide full protection for the gravely endangered gharial ("Gavialis gangeticus"). Administrative approval of the Government of India for the establishment of the National Chambal Sanctuary was conveyed in Order No. 17-74/77-FRY (WL) dated 30 September 1978. The Sanctuary has sanctuary status declared under Section 18(1) of the Wildlife Protection Act, 1972. Since such a declaration is carried out by individual states for territory falling within their jurisdiction, there are three separate notifications covering the National Chambal Sanctuary - the Madhya Pradesh portion was gazetted in the Government of Madhya Pradesh Notice No. F.15/5/77-10(2) dated 20 December 1978, the Uttar Pradesh portion was gazetted in the Government of Uttar Pradesh Notice No. 7835/XIV-3-103-78 dated 29 January 1979 and the Rajasthan portion was gazetted in the Government of Rajasthan Notice No.F.11(12)Rev.8/78 dated 7 December 1979. In a stretch of 96 km, from km 344 to km 440 from its source, the Chambal flows through a deep gorge, while lower down, there are wide plains. The Gandhisagar Dam is located near the center of this reach. As there is a deep gorge immediately upstream of the dam, the reservoir has a large storage capacity despite its comparatively low height. For the next 48 km, the river flows through the Kundal Plateau, and the Rana Pratap Sagar Dam is constructed at the lower end of this. The topography permits fairly good storage upstream of the dam. Further down, the Jawahar Sagar Dam is located in the middle of the Kota gorge. The Kota Barrage is located near Kota town, where the river emerges from the gorge section into the plateau. The total area draining the Kota Barrage is 27,319 km2. The Chambal River is used for hydropower generation at Gandhi Sagar dam, Rana Pratap Sagar dam and Jawahar Sagar Dam and for annual irrigation of 5668.01 square kilometres in the commands of the right main canal and the left main canal of the Kota Barrage. The Gandhi Sagar dam is the first of the four dams built on the Chambal River, located on the Rajasthan-Madhya Pradesh border.