The widespread flooding overnight on Wednesday and into Thursday damaged or destroyed numerous diversion structures along the streams, allowing uncontrolled inflows into irrigation ditches and causing reservoir levels to rise uncontrolled.
You can unsubscribe at any time and we'll never share your details to third parties. Democratic Republic of the Congo | Français, State of Vatican City (Holy See) | Italiano. Snow-packed side roads and slushy highways met Denver drivers Monday as a winter storm continues to drop snow across the metro area. Near the surface, winds flowing upslope behind a cold front and also tapping Gulf moisture from the southeast converged on the Front Range. Bart noticed the women as they waved red scarves from the deck of a home. The volunteer group consisted of 113 volunteer engineers from 27 engineering consulting firms, four federal agencies, and one state agency went to work. A junkyard on East 37th Street and First Avenue in Evans sits in rising floodwater from the South Platte River. Winds aloft were spreading apart, enhancing lift in the atmosphere for rain and thunderstorms. The tool calculated an estimated precipitation index (EPI) for the rainfall that occurred and the inspection criteria was developed. GET BREAKING NEWS IN YOUR BROWSER. The concerns regarding first fill and pool of record conditions and rainfall beyond design standards were the primary drivers that prompted emergency dam inspections. Dave Sutherland, an OSMP interpretive naturalist who has led many post-flood interpretive hikes, likens the experience to the phases of grieving: He tries to enhance the visitors’ emotional recovery by shifting the group from initial feelings of denial, anger and loss to an acceptance phase “where they can see the change as a potentially positive thing from an ecological and geological point of view.”. The Alpine Rescue Team uses a high line and a sling stretched across Four Mile Canyon to rescue Darian Shaw from her Salina home. The owners of the high and significant hazard dams reported overall the dams were functioning well.
The previous wettest single month in Boulder was 9.60 inches in May 1995. Kody Payne, 7, and his sister Kaelyn, 10, walk along a dirt path next to what used to be U.S. 36 near Pinewood Springs on Sept. 24, 2013. The DSB’s presence at the EOC’s allowed for direct communication with emergency managers at both the county and state levels and provided both a technical resource for interpreting general and specific dam safety risks and knowledge of dam structures and operations for verification of information being disseminated to the EOC’s, media and general public.
Temperatures will reach a high of 17 with wind chill values as low as minus-4, according to the National Weather Service. “We saw several colonies along the creeks that had water flowing right over them.” Prairie dogs can swim, but Swanson doesn’t know whether the affected individuals moved to higher ground or drowned; all she can say is that these colonies are no longer active. This reservoir is located on North St. Vrain Creek that serves as a water source for the City of Longmont, CO. During the peak of the storm, approximately 10,000 cfs flowed through the emergency spillway and into the Town of Lyons, CO, causing devastating damage. Although this mouse is a riparian species adapted to flooding, Swanson says that due to the unusual timing of the floods, which coincided with the beginning of the hibernation season, typical hibernation sites may have been lost. Severe Flooding on the Colorado Front Range: September 2013 Report A Preliminary Assessment from the CIRES Western Water Assessment at the University of Colorado, NOAA ESRL Physical Science Division, and the CSU Colorado Climate Center . They represent some of the most severely-flooded mountain stream reaches. Estimates of peak flood discharge for 21 sites in the Front Range in Colorado in response to extreme rainfall in September 2013. Colorado Division of Water Resources. By continuing to use the site, you accept our Privacy Policy and Cookie Policy. Dams, irrigation ditches and stream channelization (straightening and widening of the channel) have all had significant impacts. Post was not sent - check your email addresses! “Because bats only have one [offspring] per year and most of these do not survive their first year, it takes decades for populations to bounce back from a dramatic decline,” he says. Develop ways to interface more with emergency managers, e.g. Impacts of flood damage on airborne bacteria and fungi in homes after the 2013 Colorado Front Range flood. … Read More, Did you miss it? Sage Ebert and Nick Lutz embrace following a memorial service for their friends Wesley Quinlan and Wiyanna Nelson at the National Center for Atmospheric Research in Boulder, Colo. Sept. 21, 2013. On Friday, September 13th (Day 2), the full effect of the flood hit the front range with the rainfall reaching 100-year and greater return intervals over multiple areas. Recently searched locations will be displayed if there is no search query. Farther downstream, as the streams meander across the Great Plains, the ecological effects, and the recovery from such disturbances, differ. Thank you for taking your time to send in your valued opinion to Science X editors.
The nine dams that failed during the event were considered small or non-jurisdictional structures with low hazard ratings. Based on review of the geology and spillway design drawings and visual examination of the concrete spillway structure and downstream rock channel from the air, it was determined the channel was well armored by bedrock and performing as designed.
Evans was under a no-flush order with 260 homes totaled or damaged by the Colorado floods. Anecdotal reports of dozens of dead snakes found on a local highway add credence to Swanson’s suspicions. An unanticipated concern that arose was uncontrolled inflow into many of the off-stream reservoirs in the impacted area. This resulted in unanticipated flooding of developed areas downstream of the ditches. Recovery of algae populations in plains streams can happen much faster.
The helicopters were filled with residents rescued from areas west of the city. Furthermore, the previous wettest September day was only 3.05 inches on Sep. 4, 1909. This situation has also highlighted another potential failure mode that should be considered when evaluating dam designs: intense, sustained rainfall leading to increased pore water pressure in the downstream shell, resulting in slope instability. Three vehicles lie in a creek after raging floodwater undercut Dillon Road near U.S. 287 in Broomfield on Sept. 12, 2013. The rapid filling combined with embankment saturation from the rain itself caused instabilities on the downstream slope of the Northwest Dam where a 40-foot long, 1-foot deep slump at the downstream shoulder occurred. Though it will take months to years to grasp the long-term effects, preliminary observations of the immediate impacts on the local flora and fauna will help resource managers figure out what they need to assess, how best to apply their limited funding, and how to direct recovery projects staffed by volunteers. Report of the September 2013 Little Thompson River Flooding and Big Elk Meadows Dam Failures. Fake Christmas Trees: Which is Better for the Environment? The river water is typically warmer because more sunlight reaches the wider channels. The 2013 flooding event was the 7th historic flood in Colorado since 1902, suggesting a frequency of about once every 16 years. Massive flooding in Colorado in September 2013, and the concomitant landslides and debris flows, caused widespread damage across the Front Range. Patrick joined the Post in 2012, starting as a digital photo editor building photo galleries, producing a photo blog and starting The Denver Post Instagram account before he moved into the sports picture editor role for the 2015-16 Broncos season and Super Bowl run. Where ditches remained intact, the receiving reservoirs filled and began to spill. Although the rainfall and resulting flooding that occurred September 8 - 18, 2013 along the front range of northern Colorado is considered extreme, it was below what would be termed a Probable Maximum Precipitation (PMP) event. Cars ended up in the creek and much of the ground was washed from under the front of the home of Matt Smart in Four Mile Canyon on September 26, 2013. “One species that is easy to observe is prairie dogs,” Swanson says. Photo 1 shows the extent and magnitude of the rainfall event. We don’t have those younger age classes coming up,” Swanson says.
On Monday September 16th, representatives from FEMA, the City of Longmont, and the Colorado Dam Safety Branch were flown to the site to assess the condition.
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In mountain streams, even during the summer months, it may take several months for the attached algae populations to recover because of cooler water temperatures and lack of sun reaching the stream channel, McCutchan says. Street flooding was particularly severe Tuesday in the east Denver metro, including Aurora.
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