OpenViz

蘭潭水庫

ID: 30302SouthOff-stream Reservoir

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 ratioOverflowing
100.4%
— 0.0% (vs Yesterday)▲ +0.1% (1 hr)

Effective storage: 922.9 10k m³ · Effective capacity: 919.7 10k m³

蘭潭水庫 real-time hydraulic engineering cross-section蘭潭水庫 storage ratio is at 100.3%, exceeding 100% full capacity and naturally overflowing.

Real-time Hydraulic Briefing

Synthesized water storage and flow dynamics

Current water storage for 蘭潭水庫 is at 100.4% with a water level elevation of 75.42 m.; inflow (1.6 m³/s) exceeds outflow (0 m³/s), resulting in net storage gain. Primary water supply covers Chiayi City Public Water.

蘭潭水庫 (ID: 30302) is an official Off-stream Reservoir situated in the Luliao Creek, Bazhang River System, operated and managed by Taiwan Water Corporation 5th District Management Office. In operation since 1944, 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 922.9 (10k m³), with a storage ratio of 100.4% and a real-time water level elevation of 75.42 meters. Hydraulic flow metrics record an inflow of 1.6 m³/s against an outflow of 0 m³/s (net flow: +1.58 m³/s), indicating active reservoir refilling.

Primary functional purposes include Chiayi City Water Buffer & Tourism, with key regional supply coverage extending across Chiayi City Public Water.

Primary Supply Area:Chiayi City Public Water
Chiayi City Water Buffer & Tourism

Effective storage

922.9 10k m³

— 0.0 10k m³ (vs Yesterday)

Water level

75.42 m

— 0.0 m (vs Yesterday)

Inflow

1.58 m³/s

▲ +0.25 m³/s (1 hr)

Total outflow

0 m³/s

— 0.0 m³/s (1 hr)

Effective capacity

919.7 10k m³

Net Flow Balance

蘭潭水庫 · Real-time hydrological balance and storage dispatch analysis

Net Inflow (Filling)
Inflow (Qin)
1.58 m³/sUpstream catchment runoff inflow rate
Total outflow (Qout)
0 m³/sGate release and flood desilting rate
Net Flow Balance (ΔQ)
+1.58 m³/sInflow exceeds outflow; storage volume is increasing

24 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.

All discharge gates closed (No flood release)
Spillway outflowMain spillway gate release or crest free overflow
N/A
24h 待命常閉
N/A
Power outletHydroelectric turbine power generation discharge
N/A
24h 待命常閉
N/A
Desilting tunnelBottom desilting and sediment bypass tunnel
N/A
24h 待命常閉
N/A
Drainage tunnelDedicated flood diversion tunnel release
N/A
24h 待命常閉
N/A
Water drawMunicipal water, industrial, or irrigation draw
N/A
24h 待命常閉
N/A
Other outflowEcological baseflow or auxiliary facility release
N/A
24h 待命常閉
N/A

Historical Storage Trends

View historical storage percentage and water volume trends over time.

Reservoir Specifications · Geographic Location

蘭潭水庫 · Engineering profile and geospatial information

Managing AgencyTaiwan Water Corporation 5th District Management Office
Responsible for facility operation and flood dispatch
Facility TypeOff-stream Reservoir
Dam structure and engineering classification
River SystemLuliao Creek, Bazhang River System
Primary catchment river basin and hydrological system
Effective capacity919.7 10k m³
Maximum designed water storage capacity of the dam
Year Completed194482 yrs in operation
Long-term water supply security and flood resilience
Geographic Location
23.4717°N, 120.4856°E嘉義市 · 東區
Open in Google Maps

Check real-time conditions and historical trends for other facilities in the same region.

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98.8%
Effective storage2,429.6 10k m³

內埔子水庫

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88.8%
Effective storage61.3 10k m³

南化水庫

30503
99.1%
Effective storage8,106.8 10k m³

德元埤水庫

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69.9%
Effective storage160.6 10k m³

曾文水庫

30502
104.2%
Effective storage48,748 10k m³

澄清湖水庫

30801
0%
Effective storage— 10k m³

Frequently Asked Questions

蘭潭水庫 · 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.