Where do salinity, flood and cyclone exposure meet the Delta Plan hotspots, and which ministries carry the climate-relevant budget?

Climate, water and soils. Part of what the twin can answer. Every figure below is the value the route serves, with its source; the raw response is at /api/twin/brain/climate.

Descriptive, sourced: no model

Basis: sourced records (URL, sha256 or locator per row), no model.

Stored values only, plus named arithmetic on them (a sum, a difference, a rank). Hazard exposure is read from the hazard brain, not recomputed. A district is 'high' when it ranks in the top 16 of the 64 on that hazard measure (ties share a rank, so more than 16 can qualify).

As of: Climate budget: 2026-27; Salinity survey years: 1973, 2000, 2009; Irrigation years: 2018-19, 2019-20, 2020-21, 2021-22; Hazard, exposure built: 2026-09-24 (lane D1); Hazard, damage period: 2015 to 2020 (BDRS 2021); Hazard, cyclone tracks to: IBTrACS file last modified 2026-09-22; Hazard, money window: FY2023-24 to FY2025-26 (e-GP award notices, lane B2).

Climate-relevant budget, FY2026-27: Tk 51,746.16 crore; p. 49
Total budget printed in the same report: Tk 469,091.47 crore; p. 47
Total budget the 25 ministry rows do not itemise: Tk 14,591.75 crore
Salt-affected land, change 1973 to 2009: 26.7%

Ministries by climate-relevant budget, FY2026-27

The climate-relevant column of the 25 rows sums to the report's printed climate total. The total budget of the 25 rows falls short of the report's printed total budget by the amount shown; the report does not itemise the difference, so no ministry share is rescaled.

Rank	Ministry or division	Climate-relevant	Share of its budget	Page
1	Ministry or division: Local Government Division	Climate-relevant: Tk 11,219.43 crore

Delta Plan hotspots

Hotspot	Districts	Area	Population	Page
Haor and Flash Flood Areas	Districts: 7	Area: 16,574 km²	Population: 15 million	Page: 65

Salinity, irrigation and rivers

thousand hectares (kha) of salt-affected soil by salinity class, dS/m

Salt-affected soil by class (thousand hectares)

Year	S1, 2-4 dS/m	S2, 4-8	S3, 8-16	S4, above 16	Total	Page
1973	S1, 2-4 dS/m: 287.37	S2, 4-8:

Hotspots against the hazard brain

the six Delta Plan hotspots (the RLHP area is shown above but not counted here)

Hotspot districts in the top 16 of 64 on each hazard

Hotspot	Districts	Storm surge, 1-in-100	Cyclones per decade	River flood, 1-in-10	River flood, 1-in-100
Haor and Flash Flood Areas	Districts: 7

Not held

District or upazila: no primary-sourced district or upazila salinity table is held (see `withheld`)
Coverage ratio: the source does not define 'total irrigated area' (see `withheld`)
Salinity by district or upazila (SRDI): No primary-sourced district or upazila salinity table is held. The SRDI figures that are sourced are the national class totals for 1973, 2000 and 2009 in `national.salinity`; the water-soils district tables in the lake are quarantined as authored data and are not read.
Irrigation coverage (irrigated area as a share of cropped area): The yearbooks print 'total irrigated area' without defining it (net or gross cropped area, and whether multiple-irrigated land is counted once), so the ratio would be a guess. The three areas are shown as printed in `national.irrigated_area`.
Irrigation schemes by district: The instrument counts are national. No district or scheme table with a primary source is held (the BADC and BWDB scheme tables in the lake are quarantined).
River basins by district (WARPO): Only facts for the Ganges, Brahmaputra and Meghna are held, and no mapping from basin to district.
Area of the River Systems and Estuaries hotspot: The Delta Plan table prints '3,5204', which is not a valid number; the other six areas are served.
Climate budget below the ministry, and by district: The report tags budget lines by ministry or division only.

Sources

Bangladesh Delta Plan 2100 (GED, Planning Commission). General Economics Division, Planning Commission. sha256 a1c4d2620ae8The source prints the River Systems and Estuaries area as '3,5204', not a valid number, so that one area is withheld. The RLHP area is listed beside the six hotspots but is not one of the Delta Plan's six.

Share of its budget:

Irrigated against cropped area (thousand hectares)

Year	Irrigated	Net cropped	Gross cropped	Page
2018-19	Irrigated: 7,777	Net cropped: 8,083	Gross cropped: 15,927	Page: 20
2019-20	Irrigated: 7,879	Net cropped: 8,126	Gross cropped: 16,057	Page: 20
2020-21	Irrigated: 7,944	Net cropped: 8,083	Gross cropped: 15,983	Page: 20
2019-20	Irrigated: 7,879	Net cropped: 8,126	Gross cropped: 16,057	Page: 21
2020-21	Irrigated: 7,944	Net cropped: 8,082	Gross cropped: 15,982	Page: 21
2021-22	Irrigated: not available	Net cropped: 8,043	Gross cropped: 15,928	Page: 21

The three river basins

River	Length	Catchment	Mean discharge	Sediment	Page
Ganges	Length: 2,510 km	Catchment: 1,087,300 km²	Mean discharge: 11,000 m³/s	Sediment: 550 million t a year	Page: 263
Brahmaputra	Length: 2,900 km	Catchment: 552,000 km²	Mean discharge: 20,000 m³/s	Sediment: 590 million t a year	Page: 263
Meghna	Length: 912 km	Catchment: 82,000 km²	Mean discharge: 4,600 m³/s	Sediment: 13 million t a year	Page: 263

Storm surge, 1-in-100:

How each hazard measure relates to recorded damage

Measure	Unit	Against recorded damage	Rank correlation
People in the 1-in-100-year storm-surge extent	Unit: % of residents	Against recorded damage: tracks recorded damage (BBS BDRS 2021, district, 2015–2020)	Rank correlation: 0.548
Cyclones within 100 km per decade, 1981–2020	Unit: storms at 34 kt or more per 10 years	Against recorded damage: tracks recorded damage (BBS BDRS 2021, district, 2015–2020)	Rank correlation: 0.58
People in the 1-in-10-year river flood extent	Unit: % of residents	Against recorded damage: tracks recorded damage weakly or not at all; JRC maps do not model embankments	Rank correlation: 0.302
People in the 1-in-100-year river flood extent	Unit: % of residents	Against recorded damage: tracks recorded damage weakly or not at all; JRC maps do not model embankments	Rank correlation: 0.123

Bangladesh Delta Plan 2100 (GED, Planning Commission). General Economics Division, Planning Commission. sha256 a1c4d2620ae8District names are matched to admin_units by exact title or by a listed alias (spelling_rule); a district can sit in more than one hotspot, so the 89 memberships are not 89 districts.

Climate Budget Report 2026-27 (Finance Division, MoF). Finance Division, Ministry of Finance. sha256 bab986d6d0ceFY2026-27 budget; the report's 'climate relevant' share is the report's own tagging, not a measured climate effect. See `budget.reconciliation` for the total the 25 rows do not reach.

Yearbook of Agricultural Statistics 2021 (BBS, MoA). Bangladesh Bureau of Statistics (Ministry of Agriculture for the 2021 edition). sha256 5239e149b2d6Each `universe` is a different printed table (BADC only, or government and private, whole country; the 2023 edition does not state its scope), so counts from different universes are not added or compared.

Yearbook of Agricultural Statistics 2023 (BBS). Bangladesh Bureau of Statistics (Ministry of Agriculture for the 2021 edition). sha256 d86104111596Each `universe` is a different printed table (BADC only, or government and private, whole country; the 2023 edition does not state its scope), so counts from different universes are not added or compared.

Yearbook of Agricultural Statistics 2021 (BBS, MoA). Bangladesh Bureau of Statistics. sha256 5239e149b2d6The two editions overlap in 2019-20 and 2020-21 and agree to within 1 thousand hectares on net and gross cropped area; the 2023 edition has no irrigated area for 2021-22. The source does not define 'total irrigated area', so no coverage ratio is formed.

Yearbook of Agricultural Statistics 2023 (BBS). Bangladesh Bureau of Statistics. sha256 d86104111596The two editions overlap in 2019-20 and 2020-21 and agree to within 1 thousand hectares on net and gross cropped area; the 2023 edition has no irrigated area for 2021-22. The source does not define 'total irrigated area', so no coverage ratio is formed.

BDP 2100 Baseline Studies, Baseline Study 04: Groundwater (BWDB). Soil Resource Development Institute (SRDI), as quoted in the BDP 2100 Baseline Study 04, Groundwater (BWDB). sha256 17fa65ed631bTable 5 on pdf page 106; its Table 6 (titled 'in Bangladesh') cites SRDI and the SRMAF Project, Ministry of Agriculture, 2010. The page prints survey years only, no method. Table 6 prints 1,020.75 thousand ha for 2000 against 1,020.68 in Table 5; the rows served here are Table 5's, and 1973 and 2009 agree in both.

BDP 2100 Baseline Studies Vol. 6: Governance and Institutional Development. General Economics Division, Planning Commission (BDP 2100 Baseline Studies Vol. 6). sha256 37fa5e4b035cThree rivers only; the figures are the Baseline Study's (pdf page 263, Table 1), not a WARPO basin register.

BDP 2100 Baseline Studies Vol. 1: Water Resources Management. General Economics Division, Planning Commission (BDP 2100 Baseline Studies). sha256 582eb539320aStatic water resources are printed for seven of the eight regions; the River Systems and Estuaries row has none. The gross area in column 2 and the extended area in column 3 are as printed.

GET /api/twin/brain/hazard?level=district. BDPolicyLab hazard brain (lane D1 exposure tables)Exposure ranks are read from the hazard brain unchanged. The river-flood measures track recorded damage weakly or not at all (`overlap.measures[].hazard_status`); the cyclone and surge measures track it better. Treat an overlap as exposure, not as risk.