·e WATER CONTROL MANUAL CORALVILLE LAKE Iowa River Basin Coralville, Iowa U.S. Army Corps of Engineers Rock Island District Rock Island, Illinois 1959 Revised January 2001 ii • NOTICE TO USERS OF THIS MANUAL lations speci that s Water Control Manual be published in a hard copy b r with loosel form, and y those sections, or s thereof, requiri changes will be sed print Therefore, this should be preserved in condition so that serts can be to the manual current. Changes to individual pages must the of revis , whi is the Divis 's approval REGULATION ASSISTANCE PROCEDURES In the event conditions arise during nonduty hours, communicat can ach by contacting, in the order listed, one of following personnel. NAME Tele12hone Number Work Number Jim Stiman (309) 788-4816 ( 30 9) 794-5849 Dave Mart ( 30 9) 786-7847 ( 30 9) 794-5361 Brian Astif an (309) 736-0897 ( 30 9) 7 94 5790 Rich Engstrom ( 30 9) 523-2854 ( 30 9) 794-5408 Tom k ( 30 9) 797-3787 ( 30 9) 794-5577 Rowland Fraser ( 319) 391-7890 ( 309) 794-5350 S.K. Nanda ( 319) 355-6872 ( 30 9) 794-5310 iii Upper Mississ i River Basin Iowa , Iowa Master Reservoir Regulation Manual ralvil ke TABLE OF CONTENTS TITLE PAGE i PHOTOGRAPH ii NOTICE TO USERS OF THE MANUAL iii REGULATION ASSISTANCE PROCEDURES iii TABLE OF CONTENTS iv PERTINENT DATA x TEXT OF MANUAL 1 1 Paragra2h Title I - INTRODUCTION 1 01 Authorization 1-1 1-02 Purpose and Scope 1-1 1-03 lated Manuals and Reports 1-1 1-04 Project Owner 1-1 1-05 Ope rat Agency 1-2 1-06 Regulating Agency 1-2 II DESCRI OF PROJECT 2-01 Lo cat 2-1 2 02 Purpose 2-1 2-03 Physical Components 2-1 a. Embankment 2-1 b. Spillway 2-2 c. outlet Works 2-2 2-04 Re Control Faci es 2-2 a. Lake McBride 2-2 b. Amana Colony 2 3 iv PAGE c. Downstream from the Res rvoir to Iowa City 2-3 d. Downstream of Iowa City 2-3 2-05 Real Estate 2-4 2-06 2-6 a. General 2-6 b. Areas 2-7 c. Recreation lities 2-8 d. Services 2-9 e. Additional Recreation 2-9 III - HISTORY OF PROJECT 3-01 Authorization 3-1 3-02 Planning and Design 3-1 3-03 Construction 3-2 3-04 Related Projects 3-3 3-05 Modification to Regulation 3-3 3-06 Principal Problems 3-8 IV - STICS 4-01 General sties 4-1 4-02 Topography 4-1 4-03 Geology and S ls 4-2 4-04 Sediment 4-2 4-05 Climate 4-2 4-06 Storms and 4-4 4-07 Runoff sties 4-6 4-08 Water Quality 4-7 4-09 Channel and Characteristics 4-9 4-10 Upstream Structures 4-10 4-11 Downstream Structures 4-10 4-12 Economic Data 4-10 a. Population 4-10 b. Agriculture 4-11 c. Industrial, Conunercial, Publ 4-12 d. Flood 4-12 V - DATA COLLECTION AND COMMUNICATION 5-01 Hydrometeoro ical Stations 5-1 a. Facilit s 5-1 b. Reporting 5-2 c. Maintenance 5-2 v Paragraph T le 5-02 Water Quality Stations 5-2 5-03 Sediment Stations 5-3 5-04 Reco Hydrologic Data 5-3 5 05 Communication Networks 5-4 5-06 Cornmunicat with ject 5 4 a. Regulating o ce wi Project office 5-4 b. Between Project office and rs 5-5 5-07 Project Report Instructions 5-5 5-08 Warnings 5-5 VI HYDROLOGIC FORECASTS 6-01 General 6-1 a. e of ineers 6-1 b. le of r es 6-1 6 02 Flo Condition Forecasts 1 6 03 Conservation Purpose Forecasts 6-2 6-04 Long Range forecasts 6-3 6-05 Drought Forecasts 6-3 VII WATER CONTROL PLAN 7-01 General ectives 7-1 7-02 Constra 7-1 7-03 Overall r Water Control 7-2 7-04 Standing Instructions to Project Personnel 7-2 7-05 Cont 7-3 7-06 Recreation 7-5 7-07 Water lity 7-6 7-08 Fish Wildli 7-6 7-09 Drought Contingency 7-6 7-10 Flood Emergency Act Plan 7-7 7-11 Other 7-7 7-12 Deviat from Normal lation 7-8 a. Emergenc s 7-8 b. Unplanned Minor ations 7-8 c. Planned Deviations 7-9 7-13 Rate of Release 7-9 VIII EFFECT OF WATER CONTROL 8-01 General 8-1 8-02 Flood Control 8-1 a. Spillway Design Flood 8-1 vi b. Standard Project Flood 8-1 c. r 8 2 8-03 Recreation 8-2 8-04 Water Qual 8-2 8 05 and Wildlife 8-2 8-06 Drought Contingency Plan 8-3 8-07 Flood Emergency Action Plan 8 3 8-08 Frequencies 8-3 a. Peak low Probabil y 8-3 b. Pool Elevat Durat and Frequency 8-3 c. Key Control Points 8-3 8-09 Other Studies 8 4 IX - WATER CONTROL MANAGEMENT 9-01 Respons lities and iz 1 a. s of Engineers 1 b. State County Agencies 9-2 9 02 Interagency Coordination 9-2 a. Local Press Corps Bulletins 9-2 b. National weather ce 9-2 c. U.S. Geological service 9-3 d. Contractors 9-3 9-03 Reports 9-3 TABLES Tables 2-1 Coralville Lake Sur ce Area T-1 2 Coralville Lake Storage Volume T-4 4-1 Minimum Temperatures 4 4-2 Maximum Temperatures 4-3 4-3 Precipitation: Ave , Maximum, Minimum 4 3 4-4 Snow: Ave , Maximum, Minimum 4-4 4 5 Eva po on 4-4 4-6 Monthly flow Frequency 4-6 4-7 Average Monthly Runoff at Coralville Res. 4 7 4-8 Marengo Flow Duration 4 7 4-9 Lone Tree Flow Durat 4-8 4 10 llo Flow Durat 4-8 4 11 Iowa Upstream Rating Curves T-7 4-12 Iowa r Tributaries: Upstream Rat Curves T-8 vii Tables Ti le 4 13 Downstream Rating s: Coralvil Reservoir to Lone Tree T-9 4-14 Downstream Rating Curves: Be Lone Tree T-10 4-15 ion and Employment 4-11 4-16 County Agri 1 Des ion 4-12 4-17 Stage/ and Stage Relationships 4-13 4-18 Average Annual Damage and Bene s 4 13 5-1 Co lle Gage Stations 5-1 EXHIBITS Exhibit T le A Supplement Pertinent Data A-1 B Coralvil Lake Project and Design Memoranda B-1 c Standing Instructions to Reservoir Personnel C-1 PLATES ate • Gene Arrangement, Location & Vicinity 2-1 Area-Capacity Curve 2-2 orage Chart; Elevation vs. % of S 2-3 Spillway Monolith 7L; , Elevat 2-4 Spillway Rating Curve 2-5 Out t Works; Plan ions 2-6 Out t works; Arra of Equipment 2-7 Outlet Works; Assembly - 2-8 Outlet Rating Curve 2-9 Outlet ing Nomogram; Gate Opening from 0.1 to 10 Feet 2-10 Outlet Rating Nomogram; Gate Opening from 5.0 to 60 Feet 2-11 La Macbride; al Wor 2-12 Amana, Iowa; 1 Wor 2-13 Sediment s 2~14 Recreat Areas; General Location an 2-15 Water Surface Profile, Iowa River; Mouth to C lle Dam 4-1 Water Surface Profile, Iowa ; Mouth to Coralville Dam 4-2 Iowa River Profile Upstream of Coralvil Dam 4-3 Iowa I Cedar Basin Topography 4-4 Coralville Lake Inflow frequency 4-5 e viii ate Iowa at Iowa C y Mean Monthly Flow 1903-1930 4-6 Iowa r at Iowa City Mean Monthly Flow 1931-1958 4-7 Iowa River at Iowa ty Mean Monthly Flow 1959-1987 4-8 Iowa River at Iowa City Mean y Flow 1988-1996 4-9 Average Time of Water Travel in Days 4-10 Cora lle Lake Gage Location 5-1 Water Quality Sampl Stations 5-2 zat for Reservoir gulat 7-1 Emergency Drawdown Curves for Various Inf low tions 7-2 lle Spillway Des Fl 8 1 Standard Project Flood Through a Half- 11 Pool 8-2 Effect of Reservoir gulat at llo Lone Tree 8-3 of 1947 Ef of Reservoir Regulation at Wapello and Lone Tree 8-4 Flood of 1993 Coralville Lake Inflow Frequency, Vo Duration 8-5 Coralville La Elevation Frequency 8-6 Co lle La Non-Exceedance Elevation Frequency 8-7 Coralvil Lake Elevation Duration 8-8 Coralvil servoir Levels 1904-1915 8-9 Coralville La Reservo Levels 1916-1927 8-10 Cor lle La Rese 1928-1939 8-11 Cor lle Lake Reservoir Levels 1940-1951 8-12 Coralville ke Res r Levels 1952-1958 8-13 Coralville Lake Reservoir Levels 1959-1970 8 14 Coralville Lake Reservoir Levels 1971-1982 8-15 Cora lle La Reservoir Levels 1983-1994 8-16 Cora lle La Reservoir Levels 1995-1999 8-17 Maximum 1 Re ed Frequency Curve, Coralvil Lake 8-18 Maximum 1 Regulated Frequency Curve, Iowa City 8-19 Maximum 1 Day ated Frequency Curve, Lone 8-20 Maximum 1 Day Frequency Curve, Wapel 8 1 ix PERTINENT DATA Location County - Johnson State - Iowa River - Iowa River at river mile 83.2 above mouth Drainage area above dam 3,115 square miles 1 inch of runoff= 166,000 acre-feet Uncontroled Drainage area Above Iowa City 156 square miles Above Lone Tree 1,178 square miles Above Wapello 9,384 square miles Type of Dam Rolled earthf ill Length of Dam 1,400 feet Heigth of Dam 100 feet Crest Elevation of Dam 743 feet, NGVD • Top Width of Dam 22 feet Spillway Type Chute spillway with uncontrolied concrete weir Crest Elevation 712 feet, NGVD Length 500 feet Outlet Works Type 1 circular concrete conduit Size 23 foot diameter Service Gates (3) Electric drum hoist operated slide gates Real estate guide taking line Fee 702 feet, NGVD (Authorized 1977) Flowage easment 702-717 feet, NGVD x e Pertinent Reservoir Elevations and Information Elevation Area Incremental (feet, (acres) storage NGVD) (acre-feet:) (cfs) 679 2,380 15,700 15,700 10,500 0 4,050 12,400 28,100 11, 8 00 0 5,370 14,500 42,600 13,000 0 Cons.