Effective storage
42,215 10k m³
▼ -104 10k m³ (vs Yesterday)Real-time conditions and historical storage trends
Observed at: 11/02/2026 06:00Daily operation date: 11/01/2026 00:00
Source: Water Resources Agency Reservoir Conditions and Daily Reservoir Operations datasets
💡 Operational Notes & FAQ
曾文水庫
Huge retention capacity. Releases generate power before feeding into downstream Wushantou Reservoir. Equipped with major sediment bypass tunnels.
Storage ratioNormal Storage
86.8%
▼ -0.2% (vs Yesterday)— 0.0% (1 hr)
Effective storage: 42,215 10k m³ · Effective capacity: 48,654 10k m³
Real-time Hydraulic Briefing
Synthesized water storage and flow dynamicsCurrent water storage for 曾文水庫 is at 86.8% with a water level elevation of 226.42 m. Storage is down 0.2% compared to yesterday at the same time; inflow (47.2 m³/s) exceeds outflow (46 m³/s), resulting in net storage gain. Primary water supply covers Chiayi and Tainan regions, interconnected with Wushantou and Nanhua reservoirs.
曾文水庫 (ID: 30502) is an official On-stream Reservoir situated in the Zengwen River System, operated and managed by Southern Region Water Resources Branch, WRA. In operation since 1973, this facility serves as a vital strategic pillar in Taiwan's regional water grid and flood mitigation network.
According to the latest observation, its effective water storage is approximately 42,215 (10k m³), with a storage ratio of 86.8% and a real-time water level elevation of 226.42 meters. Hydraulic flow metrics record an inflow of 47.2 m³/s against an outflow of 46 m³/s (net flow: +1.24 m³/s), indicating active reservoir refilling.
Primary functional purposes include Chianan Plain Agricultural Irrigation, Southern Taiwan Municipal & Industrial Water, Hydroelectric Power, Flood Retention, with key regional supply coverage extending across Chiayi and Tainan regions, interconnected with Wushantou and Nanhua reservoirs.
Primary Supply Area:Chiayi and Tainan regions, interconnected with Wushantou and Nanhua reservoirs
Chianan Plain Agricultural IrrigationSouthern Taiwan Municipal & Industrial WaterHydroelectric PowerFlood Retention
Water level
226.42 m
▼ -0.06 m (vs Yesterday)Inflow
47.22 m³/s
▲ +39.35 m³/s (1 hr)Total outflow
45.98 m³/s
▼ -0.22 m³/s (1 hr)Effective capacity
48,654 10k m³
Net Flow Balance
曾文水庫 · Real-time hydrological balance and storage dispatch analysis
Inflow (Qin)
47.22 m³/sUpstream catchment runoff inflow rateTotal outflow (Qout)
45.98 m³/sGate release and flood desilting rateNet Flow Balance (ΔQ)
+1.24 m³/sInflow exceeds outflow; storage volume is increasing24 小時水文吞吐平衡走勢
雙向對稱流量觀測（上方為上游入流，下方為大壩放流，穿梭折線為淨出入差額）Discharge Gates & Facilities
Real-time telemetry for spillways, drainage tunnels, desilting tunnels, and power outlets.
Spillway outflowMain spillway gate release or crest free overflow
24h 待命常閉
Power outletHydroelectric turbine power generation discharge
45.97 m³/s
Desilting tunnelBottom desilting and sediment bypass tunnel
24h 待命常閉
Drainage tunnelDedicated flood diversion tunnel release
24h 待命常閉
Water drawMunicipal water, industrial, or irrigation draw
24h 待命常閉
Other outflowEcological baseflow or auxiliary facility release
0.01 m³/s
Historical Storage Trends
View historical storage percentage and water volume trends over time.
Reservoir Specifications · Geographic Location
曾文水庫 · Engineering profile and geospatial information
Managing AgencySouthern Region Water Resources Branch, WRA
Facility TypeOn-stream Reservoir
River SystemZengwen River System
Effective capacity48,654 10k m³
Year Completed1973
Geographic Location
23.2508°N, 120.5369°E嘉義縣 · 大埔鄉
Related Reservoirs in Region
Check real-time conditions and historical trends for other facilities in the same region.
Frequently Asked Questions
曾文水庫 · Key insights into reservoir metrics, release mechanisms, and facility operations
FAQ
Huge retention capacity. Releases generate power before feeding into downstream Wushantou Reservoir. Equipped with major sediment bypass tunnels.