Effective storage
54.6 10k m³
▲ +0.4 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
56.5%
▲ +0.4% (vs Yesterday)▲ +0.4% (1 hr)
Effective storage: 54.6 10k m³ · Effective capacity: 96.6 10k m³
Real-time Hydraulic Briefing
Synthesized water storage and flow dynamicsCurrent water storage for 鏡面水庫 is at 56.5% with a water level elevation of 138.9 m. Storage is up 0.4% compared to yesterday at the same time (rising 0.4% in the past hour); inflow and outflow are balanced (inflow 0 m³/s, outflow 0 m³/s) with steady water level. Primary water supply covers Nanhua, Zuojhen, and parts of Yujing in Tainan.
鏡面水庫 (ID: 30504) is an official On-stream Reservoir situated in the Cailiao Creek, Zengwen River System, operated and managed by Taiwan Water Corporation 6th District Management Office. In operation since 1980, 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 54.6 (10k m³), with a storage ratio of 56.5% and a real-time water level elevation of 138.9 meters. Inflow (0 m³/s) and outflow (0 m³/s) remain balanced, maintaining stable water storage.
Primary functional purposes include Municipal Water for Nanhua & Zuojhen, Irrigation Backup, with key regional supply coverage extending across Nanhua, Zuojhen, and parts of Yujing in Tainan.
Primary Supply Area:Nanhua, Zuojhen, and parts of Yujing in Tainan
Municipal Water for Nanhua & ZuojhenIrrigation Backup
Water level
138.9 m
▲ +0.04 m (vs Yesterday)Inflow
0.02 m³/s
— 0.0 m³/s (1 hr)Total outflow
0 m³/s
— 0.0 m³/s (1 hr)Effective capacity
96.6 10k m³
Net Flow Balance
鏡面水庫 · Real-time hydrological balance and storage dispatch analysis
Inflow (Qin)
0.02 m³/sUpstream catchment runoff inflow rateTotal outflow (Qout)
0 m³/sGate release and flood desilting rateNet Flow Balance (ΔQ)
0 m³/sInflow and outflow are balanced; storage remains steady24 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
N/A
Water drawMunicipal water, industrial, or irrigation draw
0.02 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
鏡面水庫 · Engineering profile and geospatial information
Managing AgencyTaiwan Water Corporation 6th District Management Office
Facility TypeOn-stream Reservoir
River SystemCailiao Creek, Zengwen River System
Effective capacity96.6 10k m³
Year Completed1980
Geographic Location
23.0406°N, 120.4739°E台南市 · 南化區
Related Reservoirs in Region
Check real-time conditions and historical trends for other facilities in the same region.
Frequently Asked Questions
鏡面水庫 · 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.