Cane River Lake

Spillway Rehabilitation

2013 Louisiana Transportation Conference

Section 68 – Public Works

Randy Denmon, P.E., Denmon Engineering

Bradley Sticker, P.E., DOTD

Topics

Background & Purpose

Spillway Data

Spillway History

Spillway Rehabilitation

Gate Rehabilitation

Concrete Rehabilitation

Cane River Lake Information

Located in Natchitoches Parish

A relic Red River Channel

Classified Significant Hazard

16,000 Acre-Feet Storage

1,350 Acre Surface Area

• Approximately 34 miles long

Cane River Lake Information

Two embankments

• North embankment near Natchitoches (part of Red

River Levee)

• South embankment near Derry under LA 484

One spillway structure

• LA 484 passes over spillway structure

North

Embankment South

Embankment

Spillway Purpose

Lake and Spillway have multiple roles

Irrigation water supply

• Several thousand acres irrigated

Recreation

Drainage

Spillway Data

LA 484 passes over spillway structure

Three sided weir inlet @ elev. 98.0’

(96’ total weir length)

Two 10’ wide by 5’ deep drawdown gates in

weir

Four 6’x6’ RCB conduits

56’ long with inlet invert

at elev. 90.0’

(conduit slope 27%)

Four 6’x6’ sluice gates

on RCB outlets

Spillway Inlet

Spillway Outlet

Spillway History

Spillway designed by DPW in 1947

Cane River Levee and Drainage District

Awarded spillway contract July 20, 1948

Award amount $70,366.97

Completed July 8, 1949

Spillway History

Embankment slides in early 1980s

Repaired 1983 with H piles and bulkhead

No record of replacement of drawdown

gates

Minimal maintenance over structure life

DOTD Involvement

RS 38:306 D.

DOTD provides engineering work for Levee

Boards

Responsibilities:

NLDD responsible for earthen embankments

NLDD operates outfall gates on spillway

RS 34:3262 CRWC responsible for

establishment, operation and maintenance of

navigable waterway

DOTD responsible for LA 484 over spillway

Why Was Rehab Needed?

Why Was Rehab Needed?

Loss of the management gates:

Impact local farmers

Close lake to recreation

Impact riparian property value

Impact City of Natchitoches Festival of Lights

DOTD Involvement

Provided historical documents

Provided review and consultation of

proposals

SPILLWAY

REHABILITATION

MAP

SOIL TYPE - CLAY

LIQUID LIMIT: 71

P.I.: 24

OLD PLANS

EPOXY GROUTING

PROBLEMS

350 LINEAR FEET CRACKS

2200 SQUARE FEET EXPOSED

CONCRETE

NEEDED TO GROUT AND SEAL

CRACKS

ALSO, COAT THE SPILLWAY WITH A

CORRISION INHIBATOR

SPECIFICATIONS

STRUCTURAL REPAIR OF CONCRETE

CRACKS BY INJECTION OF EPOXY

RESIN ADHESIVE – LTRC, 1989

EVALUATION AND REPAIR OF

CONCRETE STRUCTURES, USACE, EM

1110-2-2002, 1995

STRUCTUAL CRACK REPAIR BY

EPOXY INJECTION, ACI, 2003

PRODUCTS

SPECIFICATON - ACI

Up close injection

EPOXY GROUTING

COST: $85/FOOT (CRACK REPAIR)

$3.35/SQ. FT. (COATING)

TOTAL COST: $39,120

VERY QUICK AND ECONOMICAL

REPAIR

MANY LAKES IN LOUISIANA ARE 50 TO

80 YEARS OLD WITH LITTLE OR NO

MAINTENANCE