Effective storage
35.8 10k m³
▼ -1.1 10k m³ (vs Yesterday)Real-time conditions and historical storage trends
Observed at: 09/18/2026 07:00Daily operation date: 09/17/2026 00:00
Source: Water Resources Agency Reservoir Conditions and Daily Reservoir Operations datasets
Storage ratioNormal Storage
90.5%
▼ -2.7% (vs Yesterday)▼ -2.7% (1 hr)
Effective storage: 35.8 10k m³ · Effective capacity: 39.6 10k m³
Real-time Hydraulic Briefing
Synthesized water storage and flow dynamicsCurrent water storage for 西勢水庫 is at 90.5% with a water level elevation of 71.85 m. Storage is down 2.7% compared to yesterday at the same time (falling 2.7% in the past hour). Primary water supply covers Nuannuan, Qidu, and parts of Keelung City.
西勢水庫 (ID: 10203) is an official On-stream Reservoir situated in the Xishi Creek, Keelung River System, operated and managed by Taiwan Water Corporation 1st District Management Office. In operation since 1926, 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 35.8 (10k m³), with a storage ratio of 90.5% and a real-time water level elevation of 71.85 meters.
Primary functional purposes include Keelung Municipal Water Supply, Water Catchment Conservation, with key regional supply coverage extending across Nuannuan, Qidu, and parts of Keelung City.
Primary Supply Area:Nuannuan, Qidu, and parts of Keelung City
Keelung Municipal Water SupplyWater Catchment Conservation
Water level
71.85 m
▼ -0.13 m (vs Yesterday)Inflow
N/A
Total outflow
0 m³/s
— 0.0 m³/s (1 hr)Effective capacity
39.6 10k m³
Net Flow Balance
西勢水庫 · Real-time hydrological balance and storage dispatch analysis
Inflow (Qin)
N/AUpstream catchment runoff inflow rateTotal outflow (Qout)
0 m³/sGate release and flood desilting rateNet Flow Balance (ΔQ)
N/AOfficial real-time inflow/outflow telemetry unavailable24 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
24h 待命常閉
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
24h 待命常閉
Historical Storage Trends
View historical storage percentage and water volume trends over time.
Reservoir Specifications · Geographic Location
西勢水庫 · Engineering profile and geospatial information
Managing AgencyTaiwan Water Corporation 1st District Management Office
Facility TypeOn-stream Reservoir
River SystemXishi Creek, Keelung River System
Effective capacity39.6 10k m³
Year Completed1926
Geographic Location
25.0883°N, 121.7397°E基隆市 · 暖暖區
Related Reservoirs in Region
Check real-time conditions and historical trends for other facilities in the same region.
Frequently Asked Questions
西勢水庫 · Key insights into reservoir metrics, release mechanisms, and facility operations
FAQ
Total capacity is the total physical volume of the reservoir basin.
In contrast, effective storage refers to the usable volume available for public, agricultural, or power supply above dead storage and sediment levels.