Gandaki River
Why in News: A 15-year-old bridge spanning the Gandaki River in Bihar’s Saran district recently collapsed, marking the third bridge collapse incident in the district within a span of 24 hours.
About Gandaki River:
The Gandaki River, also known as the Narayani and Gandak, is one of the major rivers in Nepal and a left-bank tributary of the Ganges in India.
Course:
- Formation: It is formed by the union of the Kali and Trisuli rivers, which rise in the Great Himalaya Range in Nepal.
- Flow Path: From this junction to the Indian border, the river is called the Narayani.
- It flows southwest into India, then turns southeast along the Uttar Pradesh–Bihar state border and across the Indo-Gangetic Plain.
- It enters the Ganges (Ganga) River opposite Patna, Bihar, after a winding course of 475 miles (765 km).
Catchment Area:
- Total Area: The river has a total catchment area of 46,300 sq. km, out of which 7,620 sq. km is located in India.
- Boundaries: It is bounded on the north by the Himalayas, south by the River Ganga, east by the Burhi Gandak Basin, and west by the Ghagra Basin.
- Glaciers and Lakes: There are about 1,710 glaciers and over 300 lakes in the upper catchment of Gandaki.
- Major Tributaries: Daraudi, Seti, Madi, Marsyandi, and Budhi Gandaki.
Notable Features:
- Deep Gorge: The river is known for possessing a deep gorge from the Himalayan region, reaching a depth of approximately 3,000 meters (9,800 feet), making it one of the deepest river gorges in the world.
- Historical Reference: The Gandaki River is mentioned in the ancient Sanskrit epic Mahabharata.
Navigation with Indian Constellation (NavIC)
Why in News: The Defence Research and Development Organisation (DRDO) has tasked a Bengaluru-based company to locally develop a receiver chip. This chip will acquire and distribute Indian time using the Navigation with Indian Constellation (NavIC) system developed by ISRO.
About Navigation with Indian Constellation (NavIC):
- Development and Origin: NavIC, originally known as the Indian Regional Navigation Satellite System (IRNSS), is an indigenous satellite-based navigation system created by the Indian Space Research Organization (ISRO).
- Satellite Configuration: NavIC comprises seven satellites: IRNSS-1B, IRNSS-1C, IRNSS-1D, IRNSS-1E, IRNSS-1F, IRNSS-1G, and IRNSS-1I. These satellites orbit Earth to provide precise positioning and timing information.
- Orbit Distribution: The constellation includes three satellites in geostationary orbit and four in inclined geosynchronous orbit, ensuring comprehensive coverage.
- Ground Network: Supporting infrastructure includes a control centre, precise timing facility, range and integrity monitoring stations, and two-way ranging stations.
- Functional Capabilities: NavIC enables users to accurately determine their geographic location and track movements within India and up to 1,500 km beyond its borders.
- Service Offerings: Services include the Standard Positioning Service (SPS) for civilian use, Restricted Service (RS) for authorized users like defence forces, and a Search and Rescue service.
- Accuracy: Provides positioning accuracy better than 10 metres across India and better than 20 metres in the region extending 1,500 km beyond India.
- Device Compatibility: Not all smartphones and navigational devices are compatible with NavIC; compatibility requires a NavIC-compatible chipset integrated into the device.
- Interoperability: NavIC SPS signals are interoperable with signals from other global navigation satellite systems (GNSS) such as GPS (US), Glonass (Russia), Galileo (European Union), and BeiDou (China).
Cholera
Why in News: Cholera cases have been identified in two Indian states following the beginning of the monsoon season.
About Cholera:
Causes and Transmission:
- Cholera is an acute diarrhoeal infection caused by consuming contaminated food or water containing Vibrio cholerae bacteria.
- It results in severe diarrhea and dehydration.
Severity and Impact:
- If untreated, cholera can be fatal within hours, particularly affecting even healthy individuals.
- Outbreaks are more prevalent in regions with poor sanitation, overcrowding, and adverse conditions like conflict or famine.
Prevention and Control:
- Cholera outbreaks are more common in warm climates and can often be predicted and prevented.
- Effective prevention involves ensuring access to clean water, proper sanitation, and promoting good hygiene practices.
Symptoms:
- Symptoms typically appear within a few hours to five days after infection.
- While some cases are mild, severe symptoms include intense watery diarrhea and vomiting, leading rapidly to dehydration.
- Untreated severe cases can result in death.
Treatment:
- Vaccination: There are three WHO pre-qualified oral cholera vaccines (OCV) — Dukoral, Shanchol, and Euvichol-Plus, administered in two doses for full protection.
- Medical Care: Treatment includes rehydration therapy, antibiotics, and zinc supplementation, particularly beneficial for children.
Patriot Air Defence System
Why in News: The United States and its allies are set to provide Ukraine with five more air defense systems, which will include Patriot missile batteries and Patriot components.
About Patriot Air Defence System:
- Name: Patriot (MIM-104)
- Full Form: Phased Array Tracking Radar for Intercept on Target
- Type: All-altitude, all-weather surface-to-air missile defense system
- Purpose: Counters tactical ballistic missiles, cruise missiles, and advanced aircraft
- Operator: U.S. Army’s most advanced air defense system
Global Use:
- Countries: Operated by the US and allies including Germany, Greece, Israel, Japan, Kuwait, the Netherlands, Saudi Arabia, South Korea, Poland, Sweden, Qatar, UAE, Romania, Spain, and Taiwan
- Combat History: First used during the 1991 Gulf War to protect Saudi Arabia, Kuwait, and Israel; later used in the 2003 U.S. invasion of Iraq
Features:
- Mobility: Mobile system comprising powerful radar, control station, power generator, launch stations, and support vehicles
- Guidance System: Equipped with a track-via-missile (TVM) guidance system; midcourse correction commands from the mobile engagement control center
Range and Altitude:
- Interceptor Altitude: Can reach more than 24 kilometers
- Target Range: Up to 160 kilometers
- Radar Range: Over 150 kilometers (93 miles)
- Flight Time: Minimum of less than nine seconds, maximum of three and a half minutes