Thursday, September 20 8:00 am – 5:00 pm
Dam Break Flood Simulation - Doing It Faster and Simpler
This workshop is FULL and has closed.
Sunday, September 16
8:30 am – 5:00 pm
Introduction to ARS-NRCS WinDAM B Earthen Embankment Overtopping Erosion Modeling Software
Only a few spots left.
Objectives: The objectives of this one-day technical seminar covering the use of WinDAM B earthen embankment overtopping software include:
• Understanding how this erosion modeling software applies to different types of earthen embankment dams
• Hydrologic and geotechnical input parameters to estimate overtopping erosion
• Navigating the WinDAM B software user interface
• Reviewing and comprehending WinDAM B erosion estimate output
• Using WinDAM B within existing USDA-NRCS dam safety policy
• Using WinDAM B software to target dam rehabilitation projects
Topics to be covered:
• Erosion Process & Algorithms
• Vegetation & Material Inputs: Definition & Characterization
• NRCS Policy & Use
• WinDAM B Input & Output
Instructors: Karl Visser, P.E., USDA-NRCS; Greg Hanson, P.E., Ph.D., USDA-ARS; and Darrel M. Temple, P.E., D.WRE (retired USDA-ARS);
Level: This is an INTERMEDIATE course. Participants should have a basic understanding of dam safety hydrology and geotechnical erosion parameters. Familiarity with USDA SITES Vegetated Auxiliary Spillway Erosion Prediction for Dams software is helpful.
Target Audience: State and federal dam safety technical designers/reviewers, consulting engineers
8:30 am – 9:00 am Continental Breakfast and Check-In
9:00 am-noon Morning Session
Noon - 1:15 pm Lunch on Own
1:15 pm - 4:45 pm Afternoon Session
Materials: CD/DVD containing backup copy of software, reference materials, and lecture materials will be provided to each participant.
Requirements: Bring a laptop computer with WinDAM B software already installed. Registrants will receive instructions for downloading the software and other details prior to the workshop.
Sunday, September 16
8:00 am – 4:30 pm
Outlet Works Hydraulics for Small Dams
Only a few spots left. Onl
This one day course will focus on the hydraulics of drop inlet/glory hole outlet works systems common in small earthen dams. The morning session will go focus on theory. In the afternoon, the group will work through a design on an actual small dam.
Instructors: Gary Fischer, P.E. Carroll College and Hydrometrics, Inc., and Matt Lindon, P.E. University of Utah Civil and Environmental Engineering
Requirements: Attendees will need to bring a laptop computer loaded with MSExcel or equivalent spreadsheet program in order to participate in the afternoon class problem. A CD with course materials will be provided to each participant.
8:00a – 8:30a Continental breakfast and check-in
8:30am – 12:00 pm Outlet Works Design
Outlet Works Components
• Outlet, inlet, outlet, pipe control, submerged
• Weirs sharp, broad, Cipoletti
• Intake Structures
• Control Mechanisms - Gates or Valves
• Energy Dissipation
• Return Channel routing
Drop Inlet Design
• Circumstances when this design works and does not
• Options for internal weir wet tower design
• Gate options
• Hydrology historical and developed
• Pressure flow
• Non pressure flow
• Gate/valve effect on hydraulics of downstream conduit
• Tailwater effects
Gate and Valve Venting
• Lessons learned
• Design guidelines
Developing Outlet/Spillway Rating Curves
• Conduit capacity vs. weir or open channel capacity
• Model options (conduit flow spreadsheets, routing software)
• HEC-HMS Hydrology, routing
• HEC-RAS for downstream open channel
• Discharge vs. reservoir stage
• Time to Drain Calc
12:00 pm – 1:00pm Lunch on your own
1:00pm – 4:30pm Hands on Design
In the afternoon we will work on an actual dam in need of an outlet replacement. The goal will be to design a passive, low maintenance, principal spillway structure and conduit that maintains 3 feet of freeboard, passes a reasonable storm runoff and provides easy access to an outlet gate.
Design decisions will include:
--Drop inlet or internal weir wet tower
--Conduit material, pressure or non-pressure design
--Gate location (upstream of drop inlet or inside wet tower on embankment)
--Gate actuator location and access
--Storm frequency for principal spillway
--Reservoir evacuation requirements
Sunday, September 16 - 1:00 pm – 4:00 pm
Frank Jaeger Dam and Reuter Hess Reservoir
The Frank Jaeger Dam (Rueter-Hess Reservoir) is a newly constructed earthen embankment located in Parker, Colorado and is the largest non-federal dam constructed in Colorado in the past 25 years. The dam is a zoned-earthfill structure that is 200-feet-tall, 7,500-feet-long, and will impound about 72,000 acre-feet of water.
The dam's owner, Parker Water & Sanitation District (PWSD), began planning the development of the water storage project in 1985. Three alternative sites were evaluated and PWSD selected the Newlin Gulch Site based on land availability and permitting constraints. Newlin Gulch is an ephemeral tributary to Cherry Creek and the dam and reservoir Site is located about 5 miles southwest of downtown Parker. The Site's geology consists of alluvium in the valley bottom and bedrock near the surface on the abutments.
The dam was planned to be designed and constructed in two phases. Phase I would result in a 135 foot high dam that would impound about 16,000 ac-ft of storage. Phase II would consist of a downstream raise of the dam to 200 feet, which would impound a reservoir of 72,000 ac-ft. During Phase I construction, additional needs for water storage were identified. PWSD decided to begin permitting and design of Phase II during the construction of Phase I. This phased development resulted in unique internal zoning of the central core and an inverted chimney filter zone. Other interesting aspects of this project include: an extensive foundation grouting program, estimating the settlement of bedrock, a 200 foot high, multi-chambered intake structure designed to pass the 100 year flood event, both stepped and plated upstream soil cement facing, and a 5-cycle labyrinth weir auxiliary spillway channel.
The field trip will include a tour of the embankment, the outlet tower, the spillway structure, the outfall from the Cherry Creek Diversion Pipeline, and the terminal (outlet works) facilities.
Thursday, September 20 - 8:30 am – 4:00 pm
Colorado State University Hydraulics Laboratory and the Bureau of Reclamation Hydraulics Laboratory. This trip is FULL and has closed. Please contact ASDSO if you'd like to be put on the waiting list in case of cancellations.
Thursday, September 20 - 8:30 am – 4:30 pm
The Homestake Water Project is jointly owned and operated by Colorado Springs Utilities and the City of Aurora. The system includes Homestake Reservoir, impounding about 43,000 acre-feet, a collection system, tunnels, Otero Pump Station and over 60-miles of pipelines that convey water to these agencies. The reservoir located in the spectacular Holy Cross Wilderness about 2.5 hours from Denver Colorado. The dam is located 10,000 feet above MSL and was originally constructed between 1965 and 1967. It is a 220-foot asphalt-faced rockfill dam, and when completed was one of the highest dams of this type in the world.
Rehabilitation efforts began in the fall of 2011. The primary work involves rehabilitating the upstream asphalt facing, with additional work to include rehabilitation of the dam crest, outlet works and diversion tunnel inlet gate maintenance. The facing work will involve milling to remove the aged asphalt and overlaying the face with new dense hydraulic asphalt. All this work is being performed on the dam’s 1.6H:1.V upstream face using specialized equipment winched from the dam crest. The rehabilitation of the facing will occur during the 2012 and 2013 construction seasons.
Friday, September 21, 8:00 am – 5:30 pm
Rocky Mountain National Park and the Lawn Lake Dam Failure
In 1982, the privately owned Lawn Lake Dam failed in the early morning hours. The resulting flood cut a 5 mile long erosion scar down a mountain, deposited a 42 acre boulder field, failed another dam downstream and sent a muddy four-foot-deep flood down the main street of Estes Park, Colorado. Tragically three people lost their lives in the dam failure flood event.
Highlights of the field trip include stops at:
Rainbow Curve along Trail Ridge Road within Rocky Mountain National Park.
This overlook is an ideal location for giving an overview of areas that were flooded when the dam failed, including: the channel scar along the Roaring River, the alluvial fan near the mouth of the Roaring River, the location of the emergency telephone where the trash collector made his call to NPS dispatch, and Horseshoe Park where the flood appeared benign to those observing the event.
The Alluvial Fan - This is a major attraction in the park, and is an interesting place to observe the geomorphic changes brought about by the flood. It also shows how plant and animal life has adapted to the changes. Participants can walk from here to the Lawn Lake Trailhead where the emergency telephone is still located.
Site of Cascade Dam – Participants can observe how small the dam was and how the flood plain changed downstream from the dam.
Also included: Aspenglen Campground; the National Park Service Visitor’s Center; the village of Estes Park, and Lake Estes.