Water draw
N/A
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
💡 Operational Notes & FAQ
石岡壩
Run-of-river control weir: regulates daily intake directly from upstream Dajia River cascade releases.
Facility Operation
40.15 m³/sCurrent Inflow Rate
Effective capacity: 120.2 10k m³ (Desilting & flood regulation) · Run-of-river facility · Primarily raises river level for diversion/water supply without storage ratio monitoring
Real-time Hydraulic Briefing
Synthesized water storage and flow dynamicsCurrent water storage for 石岡壩 is at 58.5% with a water level elevation of 273.53 m. Storage is up 0.3% compared to yesterday at the same time (rising 0.3% in the past hour). Primary water supply covers Greater Taichung Metropolitan Area via Fengyuan Water Treatment Plant.
石岡壩 (ID: 20202) is an official Run-of-river Weir situated in the Dajia River System, operated and managed by Central Region Water Resources Branch, WRA. In operation since 1977, 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 70.3 (10k m³), with a storage ratio of 58.5% and a real-time water level elevation of 273.53 meters.
Primary functional purposes include Taichung Metropolitan Water & Irrigation Intake, with key regional supply coverage extending across Greater Taichung Metropolitan Area via Fengyuan Water Treatment Plant.
Primary Supply Area:Greater Taichung Metropolitan Area via Fengyuan Water Treatment Plant
Taichung Metropolitan Water & Irrigation Intake
Water level
273.53 m
▲ +0.01 m (vs Yesterday)Inflow
40.15 m³/s
▲ +1.74 m³/s (1 hr)Total outflow
N/A
Catchment rainfall
0 mm
Net Flow Balance
石岡壩 · Real-time hydrological balance and storage dispatch analysis
Inflow (Qin)
40.15 m³/sUpstream catchment runoff inflow rateTotal outflow (Qout)
N/AGate 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
Hydrological Flow & Water Level History
Historical telemetry trends for inflow, outflow discharge, and live water level elevation.
Reservoir Specifications · Geographic Location
石岡壩 · Engineering profile and geospatial information
Managing AgencyCentral Region Water Resources Branch, WRA
Facility TypeRun-of-river Weir
River SystemDajia River System
Effective capacity120.2 10k m³
Year Completed1977
Geographic Location
24.2794°N, 120.7769°E台中市 · 石岡區
Related Reservoirs in Region
Check real-time conditions and historical trends for other facilities in the same region.
Frequently Asked Questions
石岡壩 · Key insights into reservoir metrics, release mechanisms, and facility operations
FAQ
Run-of-river control weir: regulates daily intake directly from upstream Dajia River cascade releases.