“LA GOTERA” DAM REMOVAL BERNESGA RIVER

you you the lakota dam was built in 1922 on the Bernays gay river to serve as an electricity factory as the small hydroelectric installations these days known as micro hydro systems used to be called the stretch of river where it was built is now in a protected area included in the world network of biosphere reserves in addition to unique wooded areas the river itself contains interesting species of environmental value for various social groups among which fish are of particular importance the structure of the dam consists of a wall presenting an impassable barrier for fish species and an area of disused gates that lead to a bypass channel at present besides several evident signs of deterioration the basin of the dam is partially silted up even in the immediate vicinity of the wall in September 2011 once the concession period and the rights under which it had been applied had terminated the water board of the de Guero hydrographic Confederation proceeded to remove the dam and the part of the channel located in the public hydraulic domain in compliance with current legislation the work was carried out under the auspices of the duero hydrographic Confederations program for the conservation and maintenance of river basins which forms part of the Spanish national strategy for the restoration of rivers instigated by the Spanish ministry for the environment and rural and marine affairs a physical exit a elección the Daniel was min twist succeeded if one when approached I'm focused on a photographer Lu so on the general lassitude process or Feliz año ellos tienen que sirve Emily yes eliminar Fiona's a banana fiance Leyva Cabo who Nova semente por motivos recuperación Delta Y fue tiene que este tipo de la passione z-- Samui demand Ava's poor colectivos diremos que en okay rhaggy ray de la cerveza tennis públicas UN intervention esto sentido suspect Evo sentiment a coach on photo people usuarios diferentes espero days lupus ecologist a--'s conservation vistas Yuriko general gassin Silvio's media Kapono fimo se da cuenta que los tenemos en muchos casos a faster tubas que no see rosalita's no compass a steno class podemos our own David Nelson Cisco a senior Oh si si si me for destino Syria Suleiman a co o salimos soon efectivo de lo habla en todo lo que sería la nación Publica del agua es la recuperación en cali drawl akkad having conducted the pertinent studies demolition of the lego terror dam began the main technical difficulty presented by the project was the difference in elevation between the old trunk road and the Riverside area consequently one of the first actions was the construction of a ramp the provide construction machinery with access to the structure as it could not be possible to remove part of the ramp once the work had concluded materials from other restoration activities carried out on the river itself were used an old river pool provided the sediments which formed the base of the ramp and concrete debris was removed and transported to lago Terra to be used temporarily for the ramp moreover during the construction of the access ramp the existing Riverside vegetation was respected thus contributing to stabilizing the ramp materials whilst at the same time minimizing impact on the area when the ramp was almost ready dismantling of the gate area began from which it would be necessary to remove all mechanical components prior to demolition and renovate the mechanisms for opening the gates at the same time members of the Fish Department of the Castilla and Leon regional government transported electro fishing equipment to the site in order to rescue the aquatic fauna in the area as expected there was an abundance of fish and successive trolls of the pool were required in order to capture the majority of the specimens these once captured were released back into the same river in a safe area away from the intervention it is precisely the obstacle that dams present to the migration of fish that is one of the arguments put forward by various social groups not only people who fish for sport as a reason for this kind of intervention tambien and black English in Mississippi where Brady's birthday I saw that feel a project in a component a particular film to become importante yo tambien polishes media buen estado Tina okay local television Ian wanted ambien positive acid Emma's super tiffy patio muchas veces es muy importante para el éxito de proyectos that work obviously eyes $40 is included ha having constructed the round the deconstruction machinery was able to enter the area once the way had been cleared to lift the gates an opening was made in the rear section of the bypass channel to enable an initial lowering of the water level in a controlled manner when the gates were opened the water level dropped by less than one meter but the process of mobilizing the sediment in the area closest to the wall had begun as expected the layer of sludge was very thin and the predominant type of sediment soon rose to the surface gravel and decimeter sized blocks with some sandy areas on the inner side of the meander through this controlled opening of the gates the impact on the stretches of river located below the demolition area was minimized and water quality levels were maintained within tolerable limits for aquatic species after a couple of hours the water level stabilized again and it was possible to begin the main demolition phase the channel area was reinforced to provide machinery with access to the wall by stacking chunks of concrete on one side and giving sufficient width to the area this concrete would be removed during the last phase of the work but was now used to facilitate the passage of the machinery to the gates the gates were the most heavily reinforced part of the structure and so it was necessary to dismantle them gradually with the machinery trying to separate the metal structure from the concrete this was a laborious process as the aim was to conduct a meticulous selection of the reinforced concrete debris in order to remove it separately after this painstaking work the way was clear providing the machinery with access to the wall itself this excess would enable a further controlled lowering of the water level to this end a 1 litre deep opening was made in the center of the dam a few minutes later the water level had dropped significantly and the sediments deposited by the river and accumulated over 90 years in the dammed area began to be exposed the retreat of the water was most pronounced furthest away from the wall in addition to leaving sediments exposed the effect of the current became apparent with the formation of the first Rapids however the depth of the water in the area close to the wall was still considerable and it would be necessary to use the debris created by the demolition to ensure the passage of the machinery while working at this point the rate of demolition accelerated thanks to the fact that the wall was composed of blocks of rock held together by a layer of unreinforced concrete with care the blocks were removed and placed on the upper section of the dam in order to move forwards a further advantage of this procedure was that it minimized the amount of material falling into the pool which would have to be retrieved later as progress was made on the wall the level of the water gradually lowered causing the river to flow faster lifting and transporting the sediments which helped to fill the deepest part of the pool the drop in the water level and the increased speed of the current became so pronounced that the fish still occupying the area migrated upstream in search of new areas to shelter it was envisaged that shortly after removal of the dam the entire area would regain its natural state and aquatic fauna would recolonize the new rapids which emerged as a result of removing the wall son controvert EDA's son obras que que bueno pues endoscope I see most of seo seo haciendo poco tiempo y la gente a Mucha gente que no entiendes como se puede hasta be narrow and destroy en eliminar hora esto tiene tiene que bueno por supuesto todo una serie despot a Sione's no Gambini Dondo porque los tenemos que la costume brando ese tipo de da cojones a female arias a spork a dolly no Salida a que cuando una de obras estas pls utilidad tenemos que eliminar de la segunda porque es una buena media del Estero a she owned a rio del estado en tu via s mucho más interesante una medida struck she owned a demolition de una to desta sophistica que muchos proyectos de pasa bestowed a she owned a de Rio C Rivera's que esta haciendo aquí el único que hace Nez cocina de más que Charro's a lo Rios ocupado January noon day she owned y por no intimacy de estructura C cuestiones que hay no VN a casa que no tiene la yo broke apart a tenemos que dar los Puente de que nosotros empezar Mohsen dear international llamo sparked a donor Lopez Depot Astro Sione's aqui pues yo van poco a poco centavos la primera en algún Kaldur ah fin cosas en en algunos pisces Nostradamus immediate OC given a fin dos de Poitiers been a 70 años y los Ultima Carlos agreed as Sun lo más abajo CNN demolition day infrastructure Azazel Etta's depresses que que Rampuri you so cozy van de Louvain el treinta ass es que yo creo que estar couses hostess Jones automotive Oh so mas que su dientes / expla car lobby ability' la necesidad de su tipo do la estructura si la cancion de la continued a longitudinal say convertido en una de las principales a Sione's en todo el problema de conservación de cortes de la confederación ezra rafita Belu oh yeah Casey accom privado que al final son son bastante rentable ZN cuanto a la recuperation que que se consigue con respecto al al gaston que se que se hace entonces esta es la la retirada de food numero no me lo setenta Y Cinco con este a sunset enticing Colossus truck to Vasquez Ankita Doce tiene Prevost okay a lo largo del los millones ella ella so chair on Crapo de para ser un número elevado realmente Algenol SE quedan album poco testimonial porque se a Lozado un estudio de de permeability entre sentiment NL companion invent areokay on conocido completo de la cuenta por que no se pone relies on todo lo rios yo-yos al finals an invent ariados red or de cuatro mil s truce too risque c'est une last imagine que nosotros estamos haciendo puede que hacer que en a las cinco milky Mientus a smile - so digo que no es que si algo significative on cuantos importancia relative a perros en cuanto empezar con este tipo de acción ya que nuestro Jett Evo al final basella la demolition o ready da de de todas aquellas estructura z-- y su phangan un interruption y que nos tiene new soca desk and a concession the following day the wall was completely breached and the river was finally freed the work to start again on the riverbed it was only a few hours before the entire upper section of the structure made of concrete had been removed and the water level had dropped a further two meters once the level had been lowered to the foot of the dam the river quickly began to affect the sedimentation mobilizing large quantities of boulders despite the low flow rate of the river water in the summer sediment mobilization would be an important process and the technicians from the water board of the duero hydrographic Confederation seize the opportunity to study and model the processes by which the river itself accomplished the real restoration work using its own resources and energy the ultimate goal of any intervention as the river sought its course rushing between the deposits accumulated over decades the work continued and the remainder of the wall mainly composed of large blocks was removed and loaded onto dumper trucks in only two days after definitively lowering the water level in the reservoir all remains have been removed including the concrete foundations on which the entire structure had rested to conclude the intervention efforts focused on removing any concrete debris or other foreign material from the river such as angular blocks or scrap metal in the process the materials were set down close to the channel area carrying out a minimum restoration to the area until the river at its peak flow rate would accomplish the final restoration work lastly the foundations of the channel were demolished and the materials removed in addition working from the road most of the materials used to make the ramp were retrieved work was limited the removal of all foreign materials from the river and the minimum investment was made in the restoration of an area that the river itself would modify according to its needs Aloha Devo principal en esta - a Sione's el de mejorar la continued as longitudinal Danelle trio en este caso concrete o lo que CE o con a demolition del Delos us existent a sentry con esta da - da he says kilo metros Del Rio Gant a sin contraband interim P dos por por la propias truce - entonces esta connectivity on Oslo same focal Altima de la fama pista Cola sino que también tiene que ver con todo lo relacionado con el sedimented in vertebra dos amigas a todo todo lo relacionado con la estructura de trio l proceed Ament odessa sigue en este tipo de acción sa suna comment' al de Loretta Dada de los Taku lo que esta molest and own entry estas a principalmente por una cuestión economic Ayotte ro tipo de a co Nelson car si bastante la hora yatra lado lo que procure ahmo's s in terminal domain OHS possible yaki aguas Arriba de la presa una gran accumulation des des a Demento mullah durante toda la vida u tilde de la la estructura Sen general Peron cambio aguas Abajo lo que tiene es un gran deficit entonces desta formal oh yeah el trio ba siendo la mobilization de de todas a sedimentation de forma natural a Travis de los diferentes Caudill's y y conseguimos local arrest abrasion de dealt ramos completo de Rio case a VOA estado en su momento por por la presse assistant a lo que busca Moses Cal Rios a un poco el L arche testin cuanto la definition final de la estructura cave a cave at nad estos otra vez de su dynamic teniendo en cuenta que cuando se caen otro tipo de esto hace ahora de lo que la bupropion reti da de que lo que c'est pretend s a salad our process owes Naturals único que second series que está sólo hace own se pueden ver a--rewin ADA's por por no tener Claro's cuales van a hacer los componentes con los de ba de manejar celled Rio no particular read ask a general meant a lo que da es una sensación de fracas on cuanto la estación cuando los zetas beau principal esta complete okay cell del ik honesty with the onset of the following hydraulic year the first rains arrived and the flow rate of the river water increased exceeding the low summer flow that had dropped the below one cubic metre per second the river continued to shape the river course and some of the boulders began to occupy the areas downstream from the old dam nevertheless the course was still winding and most of the sedimentation accumulated at the upper section of the reservoir remained largely unaffected by the opening of the channel since they were still untouched by the erosive processes subsequently an increase in the river water flow with Peaks that did not exceed 20% of the ordinary flow rate initiated the process of transporting large amounts of sediment which within 12 hours had been relocated to the lower stretches of the section concerned characterized by a marked deficit in sedimentation in less than a month the bonus got river had effectively reclaimed most of its original course over the following hydraulic year the evolution of the area will be monitored in order to extract information about the natural regeneration processes of the benezia River and extrapolate it to other environmental restoration interventions envisaged by the water board of the de Guero hydrographic Confederation you

Channel: Confederación Hidrográfica Del Duero

Views: 7,084,341

Rating: 4.2380581 out of 5

Keywords: Spanish National Strategy of Riv, dam removal, river restoration

Id: Gvr4WXH9Sd0

Length: 22min 3sec (1323 seconds)

Published: Wed Mar 25 2015