flood detection and warning chemung river basin michael a. sprague, director steuben county office...
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Flood Detection and Warning Chemung River Basin
Michael A. Sprague, Director
Steuben County Office of Emergency Services&President, Environmental Emergency Services
Environmental Emergency Services, Inc.Environmental Emergency Services, Inc.
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The Need For Real-Time Flood Information
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Where Are We ? One of the Sister Watersheds !
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Geographic features: The Chemung River is formed by the confluence of the Tioga River, flowing northward from Pennsylvania, and the Cohocton River, flowing southeast in New York. The Chemung joins the Susquehanna River at Sayre, Pennsylvania.
Drainage area: 2,604 square milesMajor tributaries: Chemung, Tioga, Cohocton, Cowanesque, CanisteoPopulation: 250,323 (6% of the total basin population)Major population centers: Elmira, Corning, Hornell (all in NY)
Water Use: 59.8% Power Generation22.4% Municipal 9.7% Industrial 4.2% Agricultural 3.9% Domestic
The Chemung Basin
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What Do We Have ?
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The Great Flood ??The Great Flood ?? 1784 -- The Ice Flood1784 -- The Ice Flood 1786 -- The Pumpkin Flood1786 -- The Pumpkin Flood
1794 -- flood 15-19 feet above normal1794 -- flood 15-19 feet above normal
1817 -- The Pumpkin Flood1817 -- The Pumpkin Flood May 1833 -- “The Great Inundation”May 1833 -- “The Great Inundation”
November 1857 -- The “Big Flood”November 1857 -- The “Big Flood”
September 1861 -- The “TremendousSeptember 1861 -- The “TremendousFlood”Flood”
May 1864 -- first floor floodingMay 1864 -- first floor flooding
March 1865 -- sets newMarch 1865 -- sets new highwater highwater marks marks
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January 1886 -- flooding “hill to hill”January 1886 -- flooding “hill to hill” June 1889 -- “The Big Flood of 1889”June 1889 -- “The Big Flood of 1889”
November 1889November 1889
May 1894May 1894 November 1900November 1900
July 1902July 1902
August 1903August 1903 March 1918March 1918
August 1920August 1920
July 1935 -- The “Finger Lakes Flood”July 1935 -- The “Finger Lakes Flood” May 1946 -- “all time high” 8” below dikesMay 1946 -- “all time high” 8” below dikes
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June 1972 -- Hurricane Agnes, flood of record, tops dikes, village of Painted Post covered by 30 feet of water
September 1975 -- Hurricane Eloise June 1976 -- “Fathers Day Flood” June 1984 August 1984 August 1994 January 1996 -- 41 county flood November 1996 -- severe flash flooding June & September 2004 – 3 FF Events
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The “Great Flood” - 1972The “Great Flood” - 1972
Tropical storm Agnes, June 23, 1972Tropical storm Agnes, June 23, 1972 Affected all of the Susquehanna River BasinAffected all of the Susquehanna River Basin
25 fatalities in Steuben County25 fatalities in Steuben County
Considered flood of record for Tioga,Considered flood of record for Tioga,Canisteo, Cohocton and Chemung riversCanisteo, Cohocton and Chemung rivers
$750 million in damages$750 million in damages
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Environmental Emergency Services
E.E.S. – A 3 county not-for-profit incorporation (501-c 3) Chemung Schuyler and Steuben Counties, Formerly the Chemung River Basin Flood Warning Support Corporation
To Advise and Inform the Populace of Chemung and Steuben Counties of Severe Flooding, Drought and Hazardous materials Incidents which Contribute to Environmental Emergencies
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A Self-Help Group
Consensus for a self-help program – 1979 – “How Can We Help Ourselves !”
Steering committee formed Memorandum of Understanding
developed Formed as Chemung River Basin
Support Corporation ---- 1981 Automated data collection equipment
installed ----- 1984
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Why a “LOCAL” System
Interest - Repeated Flooding
Demand to “FIX” Need for Education Ability to Foster
Better Community Response
Take Advantage of Local Resources
Need - Repeated Flooding
Loss of Outside Info Tailored Information Greater Lead Time Create A Focus Group Coordinate,
Coordinate, Coordinate!
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Our Make-up
Local Industry Counties Cities Towns Villages
•County EMO’s – 3 counties•NYS DEC Flood Personnel•Southern Tier Regional Planning •City of Corning•City of Elmira•City of Hornell•Flood Operations Volunteers•Motor Components, LCC•Corning Inc.•Town of Erwin•SWCD – 3 Counties•NWS•USGS
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Elements of A Successful Local Flood Warning System Interest/need for a “LOCAL” system
Cooperation/community involvement
Local Funding and Support Grants Be Creative We Know “IT” Will Happen Again !
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Budget – How We Make It Work
Annual Budget: $31,750 Counties $18,400 Municipalities $13,350 Cities-$2,000Towns-$2,000-$250Villages-$500-$250
Annual Report to All Municipalities
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Evolution of the Current System• Emergency Operation Center - Staffed by Volunteers
• Consolidated Information Center
• Originally Based on “Long Term Flood Events”
• Simplified Flood Forecasting Computer Model - NWS Assistance
• ‘90’s Forced an Evolution to “Short Term-Flash Flood Events”
• EOC became a “Clearing House” for Basin-wide information
• Allows Emergency Management Offices, NWS and Corps “Hands-Free” information exchange
• Became a Pilot Site for “IP” based IFLOWS deployment
• Challenge to evolve as NWS technology advances
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Hydrologic Development and Verification
• Many Events - Lots of Data
• Local Involvement Provides Verification and Feedback
• Able to Identify Basin Issues - Particularly Troublesome Tributaries
Changes to the Basin
• Sitting of Additional Gauges - NWS Hydrologist Input
• Development of “Standard Ratings” for new gauges
• Cost Effective Approach
Help the Weather Service Help Us
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www.highwater.org
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