Effective storage
20,578.2 10k m³
— 0.0 10k m³ (vs Yesterday)Real-time conditions and historical storage trends
Observed at: 09/18/2026 12:00Daily operation date: 09/17/2026 00:00
Source: Water Resources Agency Reservoir Conditions and Daily Reservoir Operations datasets
💡 Operational Notes & FAQ
石門水庫
During typhoons, regulated flood releases and hydraulic desilting are conducted to preserve dam safety and downstream safety.
Storage ratioOverflowing
100.3%
— 0.0% (vs Yesterday)— 0.0% (1 hr)
Effective storage: 20,578.2 10k m³ · Effective capacity: 20,526 10k m³
Real-time Hydraulic Briefing
Synthesized water storage and flow dynamicsCurrent water storage for 石門水庫 is at 100.3% with a water level elevation of 245.06 m.; inflow (33.4 m³/s) exceeds outflow (24.3 m³/s), resulting in net storage gain. Primary water supply covers Taoyuan City, Western New Taipei City, and Northern Hsinchu County.
石門水庫 (ID: 10201) is an official On-stream Reservoir situated in the Dahan River, Tamsui River System, operated and managed by Northern Region Water Resources Branch, WRA. In operation since 1964, 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 20,578.2 (10k m³), with a storage ratio of 100.3% and a real-time water level elevation of 245.06 meters. Hydraulic flow metrics record an inflow of 33.4 m³/s against an outflow of 24.3 m³/s (net flow: +9.16 m³/s), indicating active reservoir refilling.
Primary functional purposes include Public Water Supply, Agricultural Irrigation, Hydroelectric Power, Flood Control & Tourism, with key regional supply coverage extending across Taoyuan City, Western New Taipei City, and Northern Hsinchu County.
Primary Supply Area:Taoyuan City, Western New Taipei City, and Northern Hsinchu County
Public Water SupplyAgricultural IrrigationHydroelectric PowerFlood Control & Tourism
Water level
245.06 m
— 0.0 m (vs Yesterday)Inflow
33.44 m³/s
▼ -1 m³/s (1 hr)Total outflow
24.28 m³/s
— 0.0 m³/s (1 hr)Effective capacity
20,526 10k m³
Net Flow Balance
石門水庫 · Real-time hydrological balance and storage dispatch analysis
Inflow (Qin)
33.44 m³/sUpstream catchment runoff inflow rateTotal outflow (Qout)
24.28 m³/sGate release and flood desilting rateNet Flow Balance (ΔQ)
+9.16 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
24.28 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
9.16 m³/s
Other outflowEcological baseflow or auxiliary facility release
24h 待命常閉
Historical Storage Trends
View historical storage percentage and water volume trends over time.
Reservoir Specifications · Geographic Location
石門水庫 · Engineering profile and geospatial information
Managing AgencyNorthern Region Water Resources Branch, WRA
Facility TypeOn-stream Reservoir
River SystemDahan River, Tamsui River System
Effective capacity20,526 10k m³
Year Completed1964
Geographic Location
24.8142°N, 121.2464°E桃園市 · 大溪區
Related Reservoirs in Region
Check real-time conditions and historical trends for other facilities in the same region.
Frequently Asked Questions
石門水庫 · Key insights into reservoir metrics, release mechanisms, and facility operations
FAQ
During typhoons, regulated flood releases and hydraulic desilting are conducted to preserve dam safety and downstream safety.