Welcome to the Ujiyari Bihar Current Affairs notes for 12 September 2026, prepared for the BPSC Combined Competitive Examination and other Bihar government examinations. The Ganga, Kosi and Gandak flood emergency in Bihar escalated on Friday: over 47.33 lakh people across 15 districts are now affected, and the Ganga at Gandhi Ghat in Patna has crossed its 2016 recorded maximum at multiple gauge stations. Deputy Chief Minister and Water Resources Minister Vijay Kumar Choudhary attributed the fresh rise principally to unexpectedly high discharge from the Son and Ghaghra, and said improvement was expected within 24 hours. The state’s response has scaled up to 1,221 community kitchens, 15 relief camps housing 12,260 people, 1,876 boats, 27 SDRF teams and 10 NDRF teams, with 3.13 lakh polythene sheets, 48,400 dry-ration packets and 10,823 quintals of animal fodder distributed. Four embankment breaches have been reported in Bhagalpur district, of which repair work is underway on the remaining structures. Bihar’s cumulative September rainfall is at 104.1 mm, about 27 per cent above the seasonal normal. Each item carries a Prelims fact set and a Mains angle, followed by five practice MCQs.

1. Ganga at Gandhi Ghat Crosses 2016 Record: 47.33 Lakh Affected Across 15 Districts

Why in News: As of 12 September 2026, more than 47.33 lakh people across 15 Bihar districts are affected by floods on the Ganga, Kosi, Gandak, Burhi Gandak, Punpun, Bagmati and Ghaghra, with all these rivers flowing above their danger marks at multiple gauge stations. The Ganga at Gandhi Ghat in Patna has now exceeded the maximum level recorded during the 2016 flood, marking the highest level at that gauge in a decade. Worst-affected districts include Bhagalpur, Patna, Saran, Vaishali, Begusarai, Katihar, Purnea and Buxar.

Why the fresh rise. Deputy Chief Minister and Water Resources Minister Vijay Kumar Choudhary on 12 September attributed the fresh surge principally to unexpectedly high discharge in the Son and Ghaghra rivers, which meet the Ganga upstream of Patna and Chhapra respectively, and said the situation was expected to improve within 24 hours as peak flows moved downstream. Continuous rainfall in Nepal and Jharkhand catchments through early September had already lifted the Kosi and Gandak inflows, and Bihar’s own September rainfall stands at 104.1 mm, about 27 per cent above the seasonal normal.

Structural context. Bihar accounts for approximately 17.2 per cent of India’s flood-prone area and about 22 per cent of the flood-affected population, with 28 of 38 districts classified as flood-prone. It lies downstream of Nepal-origin rivers (Kosi, Gandak, Bagmati, Kamla, Mahananda) whose catchments are almost entirely in Nepal. The Ganga below Patna is fed by the Son and Ghaghra upstream and by the Gandak at Sonpur (Hajipur) and Kosi at Kursela (Katihar) downstream.

Bihar Relevance:

  • Prelims: As of 12 September 2026, floods affect over 47.33 lakh people across 15 Bihar districts; Ganga, Kosi, Gandak, Burhi Gandak, Punpun, Bagmati and Ghaghra are all above danger marks.
  • Prelims: The Ganga at Gandhi Ghat, Patna has crossed its 2016 recorded maximum; the fresh surge is attributed to unexpectedly high discharge in the Son and Ghaghra.
  • Prelims: Deputy CM Vijay Kumar Choudhary holds the Water Resources portfolio; he expected improvement within 24 hours as peak flows moved downstream.
  • Prelims: Bihar’s cumulative September rainfall is 104.1 mm, about 27 per cent above the seasonal normal.
  • Prelims: Bihar accounts for about 17.2 per cent of India’s flood-prone area and 22 per cent of the flood-affected population; 28 of 38 districts are flood-prone.
  • Mains: The cross-basin hydraulics of the Ganga in Bihar, where Son and Ghaghra inflows can compound Kosi-Gandak peaks; the limits of embankment-only flood management; India-Nepal cooperation on transboundary river flows (GS3 disaster management, GS2 IR).

2. Relief Architecture Scaled Up: 1,221 Kitchens, 1,876 Boats, 37 Rescue Teams

Why in News: The Bihar Disaster Management Department confirmed on 12 September 2026 that the relief architecture has scaled up substantially: 1,221 community kitchens are operating across affected districts (up from 951 on 11 September and 38 on 5 September), 15 relief camps are housing 12,260 flood victims, and 1,876 boats are deployed for evacuation and daily supply runs. 27 State Disaster Response Force (SDRF) teams and 10 National Disaster Response Force (NDRF) teams are on the ground.

Material distributed. As of 12 September the state has distributed approximately 3.13 lakh polythene sheets, 48,400 dry-ration packets and 10,823 quintals of animal fodder in the affected districts, alongside medical camps, mobile veterinary units and drinking-water tankers. Ministers-in-Charge and Secretaries-in-Charge have been camping in the 13 Ganga-riverine districts from Buxar to Katihar, per the directive issued on 5 September 2026, following Chief Minister Samrat Choudhary’s aerial survey of the flood-hit districts on 4 September 2026.

Institutional framework. Bihar’s flood response operates under the Disaster Management Act, 2005, through the State Disaster Management Authority (SDMA) chaired by the Chief Minister, the Water Resources Department for embankment control, and the Disaster Management Department for relief. NDRF was raised under the DM Act, 2005; the SDRF is its state-level counterpart.

Bihar Relevance:

  • Prelims: As of 12 September 2026: 1,221 community kitchens, 15 relief camps housing 12,260 people, 1,876 boats, 27 SDRF and 10 NDRF teams deployed.
  • Prelims: Material distribution: 3.13 lakh polythene sheets, 48,400 dry-ration packets, 10,823 quintals of animal fodder.
  • Prelims: Ministers-in-Charge and Secretaries-in-Charge camp in the 13 Ganga-riverine districts from Buxar to Katihar; CM Samrat Choudhary conducted an aerial survey on 4 September 2026, and the camping directive followed on 5 September 2026.
  • Prelims: The directive covers the 13 Ganga-riverine districts from Buxar to Katihar, among them Buxar, Bhojpur, Patna, Saran, Vaishali, Begusarai, Samastipur, Lakhisarai, Khagaria, Munger, Bhagalpur and Katihar.
  • Prelims: Institutional framework: Disaster Management Act, 2005; NDRF is central and SDRF state; State Disaster Management Authority is chaired by the Chief Minister.
  • Mains: The state’s command architecture in a multi-district emergency; the community-kitchen model as a compact instrument of disaster relief in India; balance between political oversight and administrative execution during a rolling disaster response (GS3 disaster management, GS2 governance).

3. Bhagalpur Embankments Under Stress: Brahmottar, Dhobania, Kalbalia, Budhiya

Why in News: The Water Resources Department on 12 September 2026 reported four embankment ruptures across Bhagalpur district, with repair and reinforcement work underway. Two are confirmed breaches: the Brahmottar embankment at Saidpur in Gopalpur block, cut by 15 to 20 feet in the early hours and since controlled, and the Dhobania Zamindari embankment at Rangra, about 20 feet. The Dhobania embankment on the Kalbalia and the Budhiya (Sadopur) ring embankment have reported cracks and seepage, with protective work in progress. These are tatbandh, that is, flood embankments, not dams.

Why embankments matter, and their limits. Bihar’s flood-defence infrastructure runs along more than 3,700 km of embankments across the state’s principal rivers, built in phases from the 1950s onwards. The classic argument for embankments is that they contain the river within a bounded channel; the classic critique is that they raise the bed level between the embankments over time (through sediment deposition), reduce the natural floodplain buffer, and concentrate risk into single-point failures at any breach. The 2008 Kosi breach at Kusaha (in Nepal) is the textbook illustration.

What repair involves. Emergency embankment repair uses sand-bag stacking, geo-textile placement and boulder pitching under the supervision of the Water Resources Department’s Flood Fighting Wing, working with district administrations. Once flood peaks recede, longer-term restoration involves core-material replacement and top-slope re-grading, which typically extends into November-December.

Bihar Relevance:

  • Prelims: Four embankment ruptures reported in Bhagalpur district by 12 September 2026. Confirmed breaches: Brahmottar embankment (Saidpur, Gopalpur) and Dhobania Zamindari embankment (Rangra). Cracks and seepage: Dhobania embankment on the Kalbalia and Budhiya (Sadopur) ring embankment.
  • Prelims: The Dhobania Zamindari embankment at Rangra had about 20 feet eroded; the Brahmottar embankment at Saidpur was cut by 15 to 20 feet.
  • Prelims: Bihar’s embankment network runs to over 3,700 km along its principal rivers; the 2008 Kosi breach at Kusaha (Nepal) is the reference-case embankment failure.
  • Prelims: The Kosi Barrage at Bhimnagar on the India-Nepal border is the principal Kosi control structure, built under the Indo-Nepal Kosi Agreement, 1954.
  • Prelims: The Flood Fighting Wing of the state Water Resources Department manages emergency embankment repair.
  • Mains: The limitations of embankment-only flood control in a sediment-loaded plains river system; sediment accumulation, floodplain constriction and rising risk of breach; the case for a mix of catchment-side interventions (upstream storage) and floodplain-side interventions (zoning, land-use restrictions) (GS3 disaster management).

4. Bhagalpur, Patna, Saran, Vaishali, Buxar Among Worst Hit: The Riverine Geography

Why in News: The State Disaster Management Department’s situation report on 12 September 2026 listed Bhagalpur, Patna, Saran, Vaishali, Begusarai, Katihar, Purnea and Buxar as the worst-affected districts, out of 15 flood-affected districts overall. The concentration reflects the state’s riverine geography along the Ganga axis and the Kosi-Gandak confluence zones.

The geography behind the pattern. Patna, on the south bank of the Ganga near the Gandak confluence, is closest to the peak-discharge stretch; Vaishali and Saran sit on the north bank flanking the Gandak-Ganga confluence at Sonpur (Hajipur); Buxar and Bhojpur lie upstream at the point where the Son joins the Ganga; Bhagalpur sits downstream where the Ganga widens ahead of the Kosi mouth at Kursela (Katihar); and Purnea lies in the Kosi fan north of the Ganga. Begusarai and Samastipur flank the Burhi Gandak.

What this concentration implies. Because all these districts have some of the highest population densities in the state and are also its principal agricultural belt, the 47-lakh headline understates the second-order economic loss (standing paddy, urad, moong; livestock feed; damage to rural roads and drinking-water infrastructure). Emergency relief is priced in weeks; rehabilitation costs typically extend over the entire kharif-to-rabi transition.

Bihar Relevance:

  • Prelims: Worst-affected districts as of 12 September 2026: Bhagalpur, Patna, Saran, Vaishali, Begusarai, Katihar, Purnea, Buxar, in a set of 15 flood-affected districts.
  • Prelims: The Gandak joins the Ganga at Sonpur (Hajipur); the Son joins the Ganga near Maner (Patna district) upstream of Patna; the Kosi joins the Ganga at Kursela (Katihar).
  • Prelims: Begusarai and Samastipur flank the Burhi Gandak; the Ghaghra joins the Ganga upstream at Chhapra (Saran).
  • Prelims: Bihar’s flood zone classification places about 73 per cent of the state area as flood-prone (28 of 38 districts).
  • Prelims: The Ganga enters Bihar near Buxar and leaves near Manihari (Katihar), running roughly west-to-east.
  • Mains: The Ganga axis as a flood corridor: population density, agricultural intensity and drainage geometry compounding the impact; disaster impact economics beyond the headline “affected” count (GS3 disaster management, GS1 geography).

5. Rainfall 27 Per Cent Above Normal: What the Monsoon Numbers Say

Why in News: The Bihar Meteorological Service Centre on 12 September 2026 confirmed that the state has recorded approximately 104.1 mm of rainfall in September so far, about 27 per cent above the seasonal normal for the same window. Continuous heavy rain across Bihar and neighbouring Nepal catchments has been the primary driver of the current rise in river levels.

How Bihar’s rainfall geography sits. Bihar’s average annual rainfall is around 1,200 mm, with about 85 per cent of the total received during the Southwest Monsoon (June to September). The North Bihar plain (north of the Ganga) is the wetter zone; the South Bihar plateau margin (south of the Ganga, transitioning into the Chota Nagpur plateau) is drier. Districts like Kishanganj receive over 1,800 mm, while parts of Gaya-Aurangabad-Sasaram receive under 900 mm.

Why the “above-normal” tag matters. A late-September surplus, coming on top of already-saturated soils and above-full-storage reservoirs, is the classic precursor to embankment stress and downstream flooding. It is also the reason the IMD’s late-season nowcasts increasingly emphasise short-duration high-intensity events as a distinct risk class from the seasonal average.

Bihar Relevance:

  • Prelims: Bihar has recorded approximately 104.1 mm of September rainfall by 12 September 2026, about 27 per cent above the seasonal normal.
  • Prelims: Bihar’s average annual rainfall is about 1,200 mm; 85 per cent falls during the Southwest Monsoon (June-September).
  • Prelims: Kishanganj is Bihar’s wettest district (over 1,800 mm); Gaya-Aurangabad-Sasaram are among the driest (under 900 mm).
  • Prelims: Continuous rainfall in Nepal and Jharkhand catchments has been a key driver of the current Ganga-Kosi-Gandak surge.
  • Prelims: The India-Nepal Kosi Agreement, 1954 and the Gandak Agreement, 1959 govern trans-boundary Kosi and Gandak river management.
  • Mains: Above-normal rainfall as a compounding factor on saturated soils; short-duration high-intensity events as a distinct risk class; India-Nepal river-basin cooperation as a strategic and hydrological necessity (GS3 environment, GS2 IR).

Practice MCQs

1. As of 12 September 2026, the Bihar Ganga-Kosi-Gandak flood situation is correctly summarised by which of the following?

a) Over 47.33 lakh people affected across 15 districts, with the Ganga at Gandhi Ghat in Patna crossing its 2016 recorded maximum; 1,221 community kitchens, 1,876 boats, 27 SDRF and 10 NDRF teams deployed b) Around 5 lakh people affected in 3 districts, with all rivers below their danger marks c) A drought emergency declared for the 13 Ganga-riverine districts on 12 September d) The Ganga at Patna is below the 2016 level and no rescue teams have been deployed

Answer: a

Explanation: As of 12 September 2026, more than 47.33 lakh people across 15 Bihar districts had been affected by floods on the Ganga, Kosi, Gandak, Burhi Gandak, Punpun, Bagmati and Ghaghra, with all these rivers flowing above their danger marks. The Ganga at Gandhi Ghat in Patna has now exceeded the maximum level recorded during the 2016 flood. Worst-affected districts include Bhagalpur, Patna, Saran, Vaishali, Begusarai, Katihar, Purnea and Buxar. The state has scaled up its relief architecture to 1,221 community kitchens, 15 relief camps housing 12,260 people, 1,876 boats, 27 SDRF teams and 10 NDRF teams, with 3.13 lakh polythene sheets, 48,400 dry-ration packets and 10,823 quintals of animal fodder distributed. Deputy Chief Minister and Water Resources Minister Vijay Kumar Choudhary attributed the fresh surge to unexpectedly high discharge from the Son and Ghaghra, expecting improvement within 24 hours. Bihar’s September rainfall stands at about 104.1 mm, about 27 per cent above the seasonal normal.

2. Four embankment breaches have been reported in which Bihar district by 12 September 2026, and what is the classic critique of embankment-only flood management?

a) Katihar district; the classic critique is that embankments increase groundwater recharge and slow river flows b) Bhagalpur district; the classic critique is that sediment deposition raises the bed level between embankments over time, reduces floodplain buffer and concentrates risk at single-point failures c) Gaya district; the classic critique is that embankments create excessive downstream water for irrigation d) Rohtas district; the classic critique is that embankments make rivers more navigable

Answer: b

Explanation: By 12 September 2026 four embankment ruptures had been reported across Bhagalpur district. Two were confirmed breaches, the Brahmottar embankment at Saidpur in Gopalpur block, cut by 15 to 20 feet, and the Dhobania Zamindari embankment at Rangra, about 20 feet; the Dhobania embankment on the Kalbalia and the Budhiya (Sadopur) ring embankment reported cracks and seepage. These are flood embankments (tatbandh), not dams. Bihar’s embankment network runs to over 3,700 km along its principal rivers. The classic critique of embankment-only flood management is that sediment deposition raises the bed level between the embankments over time, reduces the natural floodplain buffer, and concentrates risk into single-point failures at any breach. The 2008 Kosi breach at Kusaha in Nepal is the textbook illustration. Emergency repair is handled by the Flood Fighting Wing of the state Water Resources Department, using sand-bag stacking, geo-textile placement and boulder pitching.

3. Regarding the concentration of Bihar’s 2026 flood in the Ganga-axis districts, which of the following correctly identifies the associated confluences?

a) The Gandak joins the Ganga at Sonpur (Hajipur); the Kosi joins the Ganga at Kursela (Katihar); the Ghaghra joins the Ganga upstream at Chhapra (Saran); the Son joins the Ganga near Maner in Patna district b) The Kosi joins the Yamuna at Prayagraj; the Gandak joins the Brahmaputra at Guwahati c) The Ganga enters Bihar near Manihari and leaves near Buxar d) The Son originates in the Aravalli range and joins the Kosi at Katihar

Answer: a

Explanation: The Gandak (Narayani in Nepal), originating in the Central Himalayas, joins the Ganga at Sonpur, adjacent to Hajipur, opposite Patna. The Kosi, rising in Tibet with most of its catchment in Nepal, joins the Ganga near Kursela in Katihar district. The Ghaghra joins the Ganga upstream at Chhapra (Saran). The Son originates from the Amarkantak plateau in Madhya Pradesh, flows through Chhattisgarh, Jharkhand and Bihar, and joins the Ganga near Maner in Patna district. The Ganga enters Bihar near Buxar and leaves near Manihari in Katihar (west to east). This confluence geometry is why the Ganga-axis districts (Patna, Vaishali, Saran, Buxar, Bhojpur, Bhagalpur, Katihar) are the most flood-vulnerable during compound Son-Ghaghra-Kosi-Gandak peaks. The Deputy CM’s 12 September statement attributed the fresh surge to unexpectedly high Son and Ghaghra discharge.

4. Deputy Chief Minister Vijay Kumar Choudhary’s statement on 12 September 2026 attributed the fresh surge in the Ganga primarily to which factor, and he expected improvement within what time frame?

a) Excess release from the Farakka Barrage in West Bengal; improvement in 72 hours b) Unexpectedly high discharge in the Son and Ghaghra rivers upstream of Patna and Chhapra; improvement in about 24 hours c) Cyclonic storm activity in the Bay of Bengal; improvement in 96 hours d) Melting glaciers in Uttarakhand; improvement in 7 days

Answer: b

Explanation: Deputy Chief Minister and Water Resources Minister Vijay Kumar Choudhary on 12 September 2026 attributed the fresh surge in the Ganga primarily to unexpectedly high discharge in the Son and Ghaghra rivers, which join the Ganga upstream of Patna (Son near Maner) and Chhapra (Ghaghra), and said the situation was expected to improve within about 24 hours as peak flows moved downstream. Bihar’s September rainfall stands at about 104.1 mm, roughly 27 per cent above the seasonal normal, and continuous rainfall in Nepal and Jharkhand catchments through early September had already lifted the Kosi and Gandak inflows. The Farakka Barrage in West Bengal is downstream, on the Ganga near the India-Bangladesh boundary, and does not directly influence Ganga levels at Patna. Bay of Bengal cyclonic activity was not implicated in the 12 September Ganga surge in Bihar.

5. Bihar’s rainfall and flood geography are correctly described by which of the following?

a) Bihar’s average annual rainfall is 300 mm, entirely from the North-East Monsoon b) Kishanganj is Bihar’s driest district and Gaya is its wettest c) Bihar’s average annual rainfall is about 1,200 mm, of which around 85 per cent falls during the Southwest Monsoon (June-September); Kishanganj is the wettest district (over 1,800 mm) and Gaya-Aurangabad-Sasaram are among the driest (under 900 mm); the state has 28 of 38 districts classified as flood-prone d) Bihar has no perennial river, and all its rainfall is orographic from the Vindhya range

Answer: c

Explanation: Bihar’s average annual rainfall is around 1,200 mm, of which about 85 per cent falls during the Southwest Monsoon (June to September). The North Bihar plain, north of the Ganga, is the wetter zone (Kishanganj receives over 1,800 mm annually), while the South Bihar plateau margin transitioning into the Chota Nagpur plateau is drier (Gaya-Aurangabad-Sasaram receive under 900 mm). The state has 28 of 38 districts classified as flood-prone, accounting for about 17.2 per cent of India’s flood-prone area and about 22 per cent of the flood-affected population. Continuous rainfall in Nepal and Jharkhand catchments has been the primary driver of the current Ganga-Kosi-Gandak surge. Bihar has multiple perennial rivers (Ganga, Kosi, Gandak) fed by Himalayan snow and monsoon flows, and its rainfall is largely monsoon-driven, not orographic from the Vindhyas. The India-Nepal Kosi Agreement (1954) and the Gandak Agreement (1959) govern trans-boundary river management.