POGG1 2015-129 SOW

• Applicant: Double Conservation District
• Grant Type: Non-Reimbursable
• Fiscal Year ‎(i.e. 2008)‎: 2015
• Project Name: Inundation Mapping for Double Conservation District
• Contract/PO #: POGG1 2015-129
• Grants - Doc Type: Scope of Work

August 4, 2014
Project: Inundation Mapping for the Double El Conservation District
Vendor: Double El Conservation District
Ms. Cheryl Churchwell, District Manager
504 Washington Avenue
P.O. Box 215
Simla, CO 80835
Phone: [phone]

Consultant: W.W. Wheeler & Associates, Inc.
Ms. Danielle Tripp, P.E.
3700 S. Inca Street
Englewood, CO 80110-3405
Phone: [phone]

CWCB funding source: Severance Tax Operational Account

SCOPE OF WORK
W.W. Wheeler, Inc. (Consultant), at the direction of the Double El Conservation District (Vendor), will
perform a dam breach modeling study and flood inundation mapping for Ramah Dam located in El Paso
County in the Arkansas River Basin. The Ramah Dam is a part of the Ramah Detention Recreational
Reservoir on the Big Sandy Creek, and is owned and operated by the Vendor.

Consultant or Vendor will submit the final report and mapping to the Colorado Division of Water
Resources, Dam Safety Branch, for approval. Grant funds will not be disbursed until the project has been
approved by the Dam Safety Branch.

PROPOSED METHODOLOGY
The Consultant shall perform a clear day dam breach analyses in accordance with the State of Colorado
Rules and Regulations for Dam Safety and Dam Construction (1/1/2007), and the Dam Safety Guidelines
for Dam Breach Analysis (2/10/2010). Correspondence shall be with Mark Perry, P.E., of the Colorado
Division of Water Resources, Dam Safety Branch, to present preliminary dam breach parameters, water
surface profile modeling, and inundation mapping and to determine if field measurements are necessary
for critical bridges.

Inundation mapping for High Hazard dams shall show the calculated extents of the dam breach flood
wave. Include cross sections at critical locations showing lateral and vertical flood extents, flood wave
velocity, and flood wave arrival time. Inundation mapping shall be extended downstream to a location
where no potential for loss of life and/or no significant property damage exist.

Inundation mapping for Significant Hazard dams shall show the route of the dam breach flood wave, the
estimated time of arrival of the flood wave at critical sections and the estimated lateral extent of
inundation. The inundation mapping shall be extended downstream to a location where no significant
property damage exists. The inundation mapping requirements for Significant Hazard dams may be
modified for good cause, with the approval of the State Engineer.