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Flood Warning Plans

 
Seven basin flood warning plans are supported by the District.  Each plan is updated and exercised annually.  All are similar to the Ralston Creek plan illustrated here.  This web version of the plan is provided for public information purposes and does not necessarily reflect the most current update.

RALSTON CREEK FLOOD WARNING PLAN

TABLE OF CONTENTS

Section
 Title Page
I INTRODUCTION I-1
II THE RALSTON CREEK DRAINAGE BASIN II-1
Drainage Basin Description II-1
Leyden Reservoir II-1
III DECISION AIDS III-1
General III-1
The Decision Making Process III-1.4
IV REQUIRED ELEMENTS OF THE WARNING PLAN IV-1
Detection and Evaluation of the Flood Threat IV-2
Dissemination of Warnings, Watches and Advisories to the Public IV-4
Response of the Public to the Warning IV-7
V COMMUNICATIONS DATA V-1
Telephone Numbers and Radio Frequencies V-2
VI METEOROLOGICAL SUPPORT VI-1
F2P2 Message Forms VI-3
VII FLOOD THREAT RECOGNITION AND WARNING PROCESS VII-1
Detection and Evaluation of the Flood Threat VII-1
Dissemination of the Warning VII-2
Step by Step Procedure VII-3
VIII PROCEDURES AND GENERAL RESPONSIBILITIES VIII-1
National Weather Service and Henz Meteorological Services VIII-2
Jefferson County Sheriff's Department VIII-5
Jefferson County Department of Emergency Management VIII-6
Jefferson County Division of Land Planning and Infrastructure VIII-6
Jefferson County Department of Health and Environment VIII-7
Jefferson County Division of Human Services VIII-7
Jefferson County R1 School District VIII-7
Arvada and Fairmount Fire Protection Districts VIII-7
Individual Weather Spotters VIII-8
General Administration and Logistics VIII-8
City of Arvada VIII-9
IX PUBLIC DISSEMINATION IX-1
Citizen Alert Messages IX-2
Emergency Vehicle and Public Address Message IX-5
X MEDIA CONTACTS X-1
XI ANNUAL REVISIONS AND PRACTICES XI-1

LIST OF FIGURES

Table Title Page
III-1 Urban Flash Flood Guidance III-7
III-2 2-Hour Convective Storm Characteristics III-7

LIST OF TABLES

Figure Title Page
III-1 Ralston Creek Flood Plain Information Map III-2
III-2 Ralston Creek/Leyden Creek Flood Plain Information Map III-3
III-3 Van Bibber Creek Flood Plain Information Map III-4
III-4 Ralston Creek Drainage Basin III-5
III-5 Ralston Creek Flood Detection Network III-6
III-6 Mountain Stream Flash Flood Guidance III-8
III-7 Hydrologic Forecast Point (HFP) Guidance III-9
III-8 Stage Sensor Computer Graphics Displays III-10
V-1 Internal Communications Flow Chart V-3