Effective storage
5,049.3 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
Storage ratioOverflowing
100.2%
— 0.0% (vs Yesterday)▼ -0.1% (1 hr)
Effective storage: 5,049.3 10k m³ · Effective capacity: 5,041 10k m³
Real-time Hydraulic Briefing
Synthesized water storage and flow dynamicsCurrent water storage for 湖山水庫 is at 100.2% with a water level elevation of 211.54 m.; inflow (4.3 m³/s) exceeds outflow (1.5 m³/s), resulting in net storage gain. Primary water supply covers Yunlin County, Southern Changhua, and parts of Chiayi.
湖山水庫 (ID: 20509) is an official Off-stream Reservoir situated in the Meilin Creek, Beigang River System, operated and managed by Central Region Water Resources Branch, WRA. In operation since 2016, 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 5,049.3 (10k m³), with a storage ratio of 100.2% and a real-time water level elevation of 211.54 meters. Hydraulic flow metrics record an inflow of 4.3 m³/s against an outflow of 1.5 m³/s (net flow: +2.79 m³/s), indicating active reservoir refilling. Operational flood-control status is currently designated as "Free overflow".
Primary functional purposes include Yunlin Municipal Water Supply, Groundwater Overdraft Mitigation, with key regional supply coverage extending across Yunlin County, Southern Changhua, and parts of Chiayi.
Primary Supply Area:Yunlin County, Southern Changhua, and parts of Chiayi
Yunlin Municipal Water SupplyGroundwater Overdraft Mitigation
Water level
211.54 m
— 0.0 m (vs Yesterday)Inflow
4.31 m³/s
▼ -0.98 m³/s (1 hr)Total outflow
1.52 m³/s
▼ -0.4 m³/s (1 hr)Effective capacity
5,041 10k m³
Net Flow Balance
湖山水庫 · Real-time hydrological balance and storage dispatch analysis
Inflow (Qin)
4.31 m³/sUpstream catchment runoff inflow rateTotal outflow (Qout)
1.52 m³/sGate release and flood desilting rateNet Flow Balance (ΔQ)
+2.79 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
1.52 m³/s
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
2.31 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
湖山水庫 · Engineering profile and geospatial information
Managing AgencyCentral Region Water Resources Branch, WRA
Facility TypeOff-stream Reservoir
River SystemMeilin Creek, Beigang River System
Effective capacity5,041 10k m³
Year Completed2016
Geographic Location
23.7042°N, 120.6278°E雲林縣 · 斗六市
Related Reservoirs in Region
Check real-time conditions and historical trends for other facilities in the same region.
Frequently Asked Questions
湖山水庫 · 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.