Tiangang Reservoir

Data & Statistics · Engineering · Tiangang Reservoir

Tiangang Reservoir sits immediately downstream of Shimantan Reservoir and failed in turn after Shimantan breached on August 8, 1975. Reconstruction was decided in 1997 and completed in December 2002. The figures below are extracted directly from the original source’s stated specifications. Source: 《舞钢市武功乡志》(Wugang City Wugong Township Gazetteer), pp. 109–111.

Engineering specifications (1958 original vs. 2002 reconstruction)

Parameter	1958 original	2002 reconstruction
Dam type	Homogeneous earth dam	Homogeneous earth dam
Main dam length	330 m	305 m
Auxiliary dam length	450 m	1,435 m
Main dam max height	16.5 m	19.1 m
Dam crest elevation	90.5 m	not stated
Total reservoir capacity	not stated (source separately gives a design-level capacity of 24.2M m³ and a check-level capacity of 6.5M m³; the relationship between the two is unclear from the text alone)	31.76M m³
Flood-control design standard	1-in-100-year design, 1-in-500-year check	1-in-50-year design, 1-in-1000-year check
Spillway max discharge	780 m³/s	4,020 m³/s
Controlled catchment area	75 km²	305 km²
Design irrigation area	112,000 mu	not stated
Total investment	not stated	43M yuan (central government 14M, Henan province 14.5M, Pingdingshan municipality 4M, Wugang city 10.5M)
Key dates	Started Jan 1958, completed April 1958	Reconstruction decided Feb 16, 1997; completed Dec 2002

Figures are taken directly from the source as stated, without independent verification or unit conversion by this project. The large discrepancy in controlled catchment area between the two periods (75 km² vs. 305 km²) may reflect a redefinition of the catchment boundary rather than a physical change, but this hasn’t been confirmed.