OpenViz

永和山水庫

ID: 10501NorthOff-stream Reservoir

Real-time conditions and historical storage trends

Observed at: 11/02/2026 06:00Daily operation date: 11/01/2026 00:00

Source: Water Resources Agency Reservoir Conditions and Daily Reservoir Operations datasets

Storage ratioNormal Storage
98.3%
▲ +0.1% (vs Yesterday)— 0.0% (1 hr)

Effective storage: 2,941 10k m³ · Effective capacity: 2,993.4 10k m³

永和山水庫 real-time hydraulic engineering cross-section永和山水庫 real-time storage ratio is 98.3%, total outflow is 1.82 cms.

Real-time Hydraulic Briefing

Synthesized water storage and flow dynamics

Current water storage for 永和山水庫 is at 98.3% with a water level elevation of 84.67 m. Storage is up 0.1% compared to yesterday at the same time; inflow (3.4 m³/s) exceeds outflow (1.8 m³/s), resulting in net storage gain. Primary water supply covers Northern Miaoli County and Xiangshan District in Hsinchu.

永和山水庫 (ID: 10501) is an official Off-stream Reservoir situated in the Beikenggou, Zhonggang River System, operated and managed by Taiwan Water Corporation 3rd District Management Office. In operation since 1984, 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 2,941 (10k m³), with a storage ratio of 98.3% and a real-time water level elevation of 84.67 meters. Hydraulic flow metrics record an inflow of 3.4 m³/s against an outflow of 1.8 m³/s (net flow: +1.62 m³/s), indicating active reservoir refilling.

Primary functional purposes include Miaoli Municipal Water, Zhunan & Toufen Industrial Water, with key regional supply coverage extending across Northern Miaoli County and Xiangshan District in Hsinchu.

Primary Supply Area:Northern Miaoli County and Xiangshan District in Hsinchu
Miaoli Municipal WaterZhunan & Toufen Industrial Water

Effective storage

2,941 10k m³

▲ +1.8 10k m³ (vs Yesterday)

Water level

84.67 m

▲ +0.01 m (vs Yesterday)

Inflow

3.44 m³/s

▼ -0.42 m³/s (1 hr)

Total outflow

1.82 m³/s

▼ -0.1 m³/s (1 hr)

Effective capacity

2,993.4 10k m³

Net Flow Balance

永和山水庫 · Real-time hydrological balance and storage dispatch analysis

Net Inflow (Filling)
Inflow (Qin)
3.44 m³/sUpstream catchment runoff inflow rate
Total outflow (Qout)
1.82 m³/sGate release and flood desilting rate
Net Flow Balance (ΔQ)
+1.62 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.

Active 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
Open
1.82 m³/s

Historical Storage Trends

View historical storage percentage and water volume trends over time.

Reservoir Specifications · Geographic Location

永和山水庫 · Engineering profile and geospatial information

Managing AgencyTaiwan Water Corporation 3rd District Management Office
Responsible for facility operation and flood dispatch
Facility TypeOff-stream Reservoir
Dam structure and engineering classification
River SystemBeikenggou, Zhonggang River System
Primary catchment river basin and hydrological system
Effective capacity2,993.4 10k m³
Maximum designed water storage capacity of the dam
Year Completed198442 yrs in operation
Long-term water supply security and flood resilience
Geographic Location
24.6547°N, 120.9322°E苗栗縣 · 三灣鄉
Open in Google Maps

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

大埔水庫

10503
84.9%
Effective storage462.1 10k m³

寶山水庫

10401
90.8%
Effective storage454.7 10k m³

寶山第二水庫

10405
100.6%
Effective storage3,402.6 10k m³

新山水庫

10204
83.4%
Effective storage830.8 10k m³

明德水庫

10601
97.1%
Effective storage1,186.6 10k m³

榮華壩

10206
—
Effective storage— 10k m³

Frequently Asked Questions

永和山水庫 · 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.