FLOOD05367

• County: Statewide
• Basin: Statewide
• Title: Design and Construction of Levees
• Date: 3/8/1999
• Prepared For: CWCB
• Prepared By: US Army Corps of Engineers
• Floodplain - Doc Type: Floodplain Report/Masterplan

Colorado Water Conservation Board
Department of Natural Resources
1313 Sherman Street
Denver, Colorado 80203
Phone, (JO)) 866,3441
FAX, (303) 866,4474

STATE OF COLORADO
.

Bill Owens
Governor

MEMORANDUM

Greg E. Walcher
Executive Din:'ctor, DNR

Peter H. Evans
Director, CWCB

To: Randy Seaholm

From: Tom Browning

Date: March 8, 1999 Draft

Re: Recommended Guidelines for Ring Levees

BACKGROUND

Per our conversation on March 4, 1999 I am providing you with engineering information
for the design and construetion of ring levees around ponds, The purpose of the ring levees is to
prevent non-native fish species from being transported from stock ponds into the mainstem of the
Colorado River (and other streams) during high water or flooding events,

The guidelines and eriteria provided below are generally consistent with the V,S, Army
Corps of Engineers publication entitled "Design and Construction of Levees" (EM 1110-2-1913),

TECHNICAL GUIDELINES

General Considerations: The term levee is defined as an embankment whose primary
purpose is to furnish flood protection from intermittent or seasonal high water, A levee may only
be subjeet to water loading for a few hours, days, or weeks out of the year, A ring levee is one
that completely eneircles the area or feature that is subject to inundation from all directions, The
principal causes of levee failure are overtopping, surface erosion, internal erosion (piping), and
slides within the levee embankment or the foundation soils.

General Design Procedure: The general procedure for levee design is outlined in Table
I, The tasks should be performed by a registered professional engineer with expertise in the
speeifie discipline related to the design task,