WISKIOpen Water and Ice

Bernard Trevor, M.Eng. P.Eng.River Forecast SectionEnvironment and Sustainable Resource Development

WISKI

ESRD Users Conference

10 March 2015

Outline

• Open water season• Data• Daily Scans• Forecasting Tools

• Ice season• Freeze-up• Breakup• Gauge height versus discharge relationship• Effects on gauge operation

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WISKI – Time Series Data

Generally we are looking at the following time series

O. = original data (direct form Collect or logger input, not editable)

V. = validated data (where WISKI validators / correctors are applied)

P. = production data (where data can be manually edited)

C. = computed data (e.g., corrected water levels; flows; etc.)

A. = aggregated data (i.e., hourly, daily, weekly, monthly, yearly)

S. = statistics (e.g., percentiles, historical means, percent normal, etc.)

F. = model flow results AND flows converted to water level (flows are written into database by the model, database computes water levels)

X. = water level thresholds

Techs

Forecaster General

Forecaster Events

Forecasting Daily DutiesDaily Scan – Reports

WISKI Reports

Forecasting Daily DutiesDaily Scan – Dashboard

Forecasting Models

• Forecast 146 locations in the province

• Pull 15 min data from WISKI• Run on an hourly time step• Route inflow through

reservoirs• Write flow back into WISKI to

back compute field water levels (removes gauge corrections)

Forecasting Water Supply Tools

Snow Survey and Ranking Reports

Snow/Precip Summary for Water Supply Regression Models

Flood Notification Update

Flood Frequency Work and Advanced Graphing

• Using advanced graphing to pull Annual Max Daily Q daily from A. DayMean-NRT as WSC data set on datamart not complete

• Using Flood Frequency analysis of extreme events to generate freq analysis for ops room use only

WISKI Flood Notification Update

SKED and Rating Curves• Updating FNM rating curve

tables

• Assessing the changing capacity of the rivers over time (ie Oldman at Lethbridge is gradually losing capacity)

Ice Season

•Alberta is a cold climate•Edmonton

•Average <0°C Nov. to Mar.•Daily Minimum <0°C Oct. to Apr.•Recorded Minimum <0°C All months

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Ice Season

•Varies by•North to south•Mountains to prairies•Higher to lower elevations•Smaller stream to larger streams

•Ice affects gauge height•Ice affects equipment•Causes flooding

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Ice Season

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Ice season

Ice Season

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Freeze-up Break up

Ice Cover Progression

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Alarms

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Alarms

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Daily Status Email for 172 ice, open water and rainfall intensity alarms

Alarms goto duty phones via duty emails

Remote Camera

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Gauge Height vs. Discharge Relationship

•Ice affects gauge height•Discharge relationship not valid with ice•Ice changes•Hydraulic smoothing•Ice production takes water out (into storage)•Ice melting releases water (out of storage)

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Gauge Height vs. Discharge Relationship

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Gauge Operation

•Ice affects equipment•Orifice blockages•Orifice movements

•Leaks

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Gauge Operation - Blockage

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Gauge Operation – Orifice movement

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Gauge Operation – Temperature effects, Leaks

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