scholarly journals Fish passage system in an irrigation dam (Pilcomayo River basin ): when engineering designs do not match ecohydraulic criteria

2012 ◽  
Vol 10 (4) ◽  
pp. 741-750 ◽  
Author(s):  
Claudio R. M. Baigún ◽  
John M. Nestler ◽  
Priscilla Minotti ◽  
Norberto Oldani
Keyword(s):  
Fish Passage ◽  
Water Levels ◽  
Upstream Migration ◽  
Prochilodus Lineatus ◽  
Hydrological Variability ◽  
Engineering Designs ◽  
Standard Designs ◽  
The Many ◽  
Upper Pool ◽  
Dissipation Power

The Route 28 Dam has the potential to block fish movements from La Estrella marsh to the Pilcomayo River. In addition, the many fish that concentrate immediately downstream of the dam may suffer high mortality when they are stranded during low water periods. The goals of this study are to determine if fish are able to pass the spillway and to assess if the design of the installed ladders (pool and weir type) effectively supports upstream migration of Prochilodus lineatus (sábalo). Results showed that only fish longer than 39 cm should be able to ascend the spillway chute, but when water levels on the spillway crest are over 0.4 m. Fish are also unable to jump from spillway toe to spillway crest because the downstream dissipation pool does not meet the minimum depth criterion for fish to accelerate to sufficient velocity. Fish ladders have insufficient number of pools and some pool dimensions and designs depart from accepted standard designs. Volumetric dissipation power in the upper pool of each fish ladder is too low for fish to rest. Also, attraction flows relative to total spillway discharge at the entrance to each fishway are insufficient. Fish passage failures of both the spillway and pool and weir systems in La Estrella marsh can be traced to the "salmon-centric" concept used by the designers. We conclude that the Route 28 Dam design including its fish passage systems, do not follow criteria to cope with the strong hydrological variability and bioecological characteristics of fish inhabiting pulsatile systems such as La Estrella marsh.

scholarly journals A barrier to upstream migration in the fish passage of Itaipu Dam (Canal da Piracema), Paraná River basin

2012 ◽  
Vol 10 (4) ◽  
pp. 697-704 ◽  
Author(s):  
Hélio Martins Fontes Júnior ◽  
Theodore Castro-Santos ◽  
Sergio Makrakis ◽  
Luiz Carlos Gomes ◽  
João Dirço Latini
Keyword(s):  
Fish Passage ◽  
Neotropical Region ◽  
Paraná River ◽  
System Component ◽  
Upstream Migration ◽  
Prochilodus Lineatus ◽  
Parana River ◽  
Itaipu Dam ◽  
Low Efficiency ◽  
Main Barrier

The majority of the fish passages built in the Neotropical region are characterised by low efficiency and high selectivity; in many cases, the benefits to fish populations are uncertain. Studies conducted in the Canal da Piracema at Itaipu dam on the Parana River indicate that the system component designated as the Discharge channel in the Bela Vista River (herein named Canal de deságue no rio Bela Vista or CABV), a 200 m long technical section, was the main barrier to the upstream migration. The aim of this study was to evaluate the degree of restriction imposed by the CABV on upstream movements of Prochilodus lineatus and Leporinus elongatus, Characiformes. Fish were tagged with passive integrated transponders (PIT tags) and released both downstream and upstream of this critical section. Individuals of both species released downstream of the CABV took much more time to reach the upper end of the system (43.6 days vs. 15.9 days), and passed in much lower proportions (18% vs. 60.8%) than those tagged upstream of this component. Although more work is needed to differentiate between fishway effects and natural variation in migratory motivation, the results clearly demonstrate passage problems at the CABV.

scholarly journals Culverts in paved roads as suitable passages for Neotropical fish species

2012 ◽  
Vol 10 (4) ◽  
pp. 763-770 ◽  
Author(s):  
Sergio Makrakis ◽  
Theodore Castro-Santos ◽  
Maristela Cavicchioli Makrakis ◽  
Ricardo Luiz Wagner ◽  
Maurício Spagnolo Adames
Keyword(s):  
Fish Passage ◽  
Fish Movement ◽  
Upstream Migration ◽  
Migratory Species ◽  
Neotropical Fish ◽  
Potential Barriers ◽  
Medium Risk ◽  
Fall Height ◽  
Additional Monitoring ◽  
Spawning Success

Improperly installed or poorly maintained culverts can pose a serious threat to fish by disrupting their habitat and endangering spawning success. Road culverts that are not designed for fish passage frequently can become obstacles. This can be especially problematic for migratory species, but can lead to fragmentation of resident populations as well. This study evaluated 40 culverts of 29 sites within a 25-km radius from Toledo city, Paraná State, southern Brazil, with respect to their likely effects on movement of the local ichthyofauna. We collected data on the shape and length of culverts, culvert material, waterfall height, water column depth, slope, and estimated flow velocity. Culverts were categorized by level of barrier risk for upstream migration: high, medium, low, and impassable, as well as the type of barrier posed (fall height, depth, length and velocity). Most of culverts analyzed were considered potential barriers to fish movement, with 45% classified as impassible, 45% as high risk, 10% as medium risk, and no culverts as low risk. Brazilian culverts as fishways will require additional monitoring and studies to corroborate the premises proposed in the present study. Road culvert projects that are properly built and maintained will be able to simultaneously improve function of roadways and protect fish populations.

scholarly journals Comparing on site human and video counts at Igarapava fish ladder, south eastern Brazil

2006 ◽  
Vol 4 (2) ◽  
pp. 291-294 ◽  
Author(s):  
Mark D. Bowen ◽  
Simone Marques ◽  
Luiz G. M. Silva ◽  
Volney Vono ◽  
Hugo P. Godinho
Keyword(s):  
Fish Species ◽  
Accurate Method ◽  
Fish Passage ◽  
Southeastern Brazil ◽  
Human Observer ◽  
Full Spectrum ◽  
Prochilodus Lineatus ◽  
Number Of Species ◽  
Fish Ladder ◽  
Number Of Individuals

On site human observations and video images were collected and compared at the window of the Igarapava Dam fish ladder (IDFL), rio Grande , Southeastern Brazil, between March 1st and June 30th, 2004. We conducted four experiments with two humans (Observer 1 and Observer 2) observing fish passage in the IDFL window while a Sony 3CCD video camera (Observer 3) recorded fish passage at the same time. Experiments, each one hour in length, were distributed throughout the diel cycle using full spectrum lights. We identified fish species, the number of individuals for each species, and the real time that they passed. Counts from each human observer were compared to the video counts. The fish species most commonly observed in the window were - curimba (Prochilodus lineatus), mandi-amarelo (Pimelodus maculatus), piau-três-pintas (Leporinus friderici) and ferreirinha (Leporinus octofasciatus). The number of species and individuals were indistinguishable for the three observers. But, the number of species and individuals were significantly different among experiments. Thus, the three observers register the same number of species and count the same number of individuals even when these two response variables differ significantly among experiments. Based on these results, we concluded that the video count was an accurate method to assess fish passage at the IDFL.

scholarly journals Increasing the Value of Uncertain Weather and River Forecasts for Emergency Managers

2016 ◽  
Vol 97 (1) ◽  
pp. 85-97 ◽  
Author(s):  
Frauke Hoss ◽  
Paul Fischbeck
Keyword(s):  
Decision Making ◽  
Emergency Management ◽  
High Water ◽  
Water Levels ◽  
Local Network ◽  
Weather Forecasts ◽  
Emergency Managers ◽  
Weather Events ◽  
The Media ◽  
The Many

Abstract Emergency managers (EMs) use National Weather Service (NWS) forecasts to prepare for and respond to severe weather events. To effectively facilitate such decision making, the NWS needs to understand this large and important group of clients. EMs translate the forecasts to local topography, suggest actions to take in preparation of high water levels, and use their local network and reputation to make people act. For this study, 17 EMs in towns along rivers were interviewed and asked to describe their use of river and weather forecasts. Forecast uncertainty is one of the many uncertainties an EM has to manage when coordinating an emergency response. Each of the interviewed EMs who uses river forecasts was acutely aware that river forecasts often have substantial uncertainty. To cope with this uncertainty, EMs engage in extensive information gathering before forming their own judgments. However, EMs often do not communicate their judgment of the situation to the public, fearing potential liability claims and backlash from the media. For emergency management decisions, while EMs do consider forecast data, they rely heavily on recorded data and monitoring crews, limiting the benefits of forecasts that can be made with significant lead time. This paper arrives at recommendations for the NWS on how to increase the value of river and weather forecasts for decision making in emergency management.

scholarly journals Rule curve for seasonal increasing of water concessions in reservoirs with low regularized discharges

RBRH ◽  
2016 ◽  
Vol 21 (3) ◽  
pp. 493-501 ◽  
Author(s):  
Tereza Helena Costa Nunes ◽  
Carlos de Oliveira Galvão ◽  
Janiro Costa Rêgo
Keyword(s):  
Water Budget ◽  
High Water ◽  
Water Levels ◽  
Semiarid Region ◽  
Large Reservoir ◽  
Hydrological Variability ◽  
Excess Water ◽  
Brazilian Semiarid ◽  
Evaporation Losses ◽  
Rule Curve

ABSTRACT Regions with high hydrological variability are usually supplied by reservoirs that regularize discharges inter-annually, with low discharge of regularization, seasonally subject to large overflow and evaporation losses in their periods of high water levels. The Brazilian semiarid is one of such regions. This work looks at the possibility of using water that would be evaporated and/or spilled, in regions with such characteristics, to supply demands that would not be otherwise provided by the maximum legally allowed withdrawal discharge. The proposed method was applied to the operation of a large reservoir, located in the semiarid region of Brazil. Through simulation of the water budget and optimization, a rule curve was developed for reservoir operation for achieving the maximum exploitable reservoir withdrawal in rainy periods. The results show that it is possible to use the excess water in periods of large inflows with no damage to water supply during dry periods.

scholarly journals Geographical dimensions of the high ground water levels in the city of Hit

2018 ◽  
Vol 216 (2) ◽  
pp. 1-28
Author(s):  
Assist prof Dr. Mishaal Faisal Gdhab
Keyword(s):  
Field Survey ◽  
Underground Water ◽  
Natural World ◽  
Water Levels ◽  
Simple Explanation ◽  
Euphrates River ◽  
Groundwater Levels ◽  
River City ◽  
The Many ◽  
The City

       We tried in this research can offer a simple explanation for the problem of high groundwater levels in the city of Hit. And its repercussions on economic, environmental, social and health aspects in the city,We were checked in the causes and dimensions and give a scientific vision in order to overcome the obstacles.We have adopted the style inductive and field survey and analysis of the questionnaire, which was distributed to a sample of homes form.The study found that the most important results of the natural world (geology and surface) that a significant impact on this phenomenon. Also it left a large, social and environmental health and economic impacts on the city and its inhabitants. We greet you see the ground and salted Rookery, ponds, swamps and pollutants .... and housing that lacks the gardens. And walls cracked by moisture and become the most residential and public buildings infected with diseases buildings and extinction and the many diseases that affect the health of urban populations and the dispersion of land use and contamination of optical and environmental hit even sources of water supply and of the Euphrates River city and provided a scientific vision for treatment, among them the work of bumpers impede the progress of the underground water and increasing the discharge Trocars the old lining   

scholarly journals Assessing fish assemblages similarity above and below a dam in a Neotropical reservoir with partial blockage

2013 ◽  
Vol 73 (4) ◽  
pp. 727-736 ◽  
Author(s):  
FG. Araújo ◽  
ABI. Santos ◽  
RJ. Albieri
Keyword(s):  
Fish Assemblage ◽  
Fish Assemblages ◽  
Fish Passage ◽  
Migratory Species ◽  
Wet Season ◽  
Prochilodus Lineatus ◽  
Oxygen Conductivity ◽  
Composition And Structure ◽  
Pimelodus Maculatus ◽  
Hoplosternum Littorale

Damming rivers disrupts the water flow and changes the ichthyofauna organisation. We investigated an impoundment with permanent connection and homogeneous environmental conditions between the zones above and below the dam. Temperature was comparatively higher during wet season irrespective of zone, and both zones had higher dissolved oxygen, conductivity and transparency in the dry season. A total of 1687 individuals comprising 27 species were collected in the downriver zone, while the reservoir had 879 individuals and 23 species. Each zone had different fish assemblage composition and structure, but assemblages were not explained by the examined environmental variables (r2 = 0.08; p = 0.307). Migratory species such as Pimelodus maculatus, Pimelodus fur, Leporinus copelandii and Prochilodus lineatus were the most affected, and probably are prevented to perform upriver migrations. On the other hand, lentic adapted species such as G. brasiliensis, Hoplias malabaricus and Hoplosternum littorale successfully colonised the reservoir. Therefore we conclude that the presence of the lateral hydrological connectivity alone does not guarantee the ecological connectivity since fish assemblage similarity differed between the two zones. Fish passage facilities should be monitored and managed to evaluate and improve their functionality.

Barriers to upstream passage by two migratory sculpins, prickly sculpin (Cottus asper) and coastrange sculpin (Cottus aleuticus), in northern Puget Sound lowland streams

2014 ◽  
Vol 71 (11) ◽  
pp. 1758-1765 ◽  
Author(s):  
Michael Thomas LeMoine ◽  
Leo Richard Bodensteiner
Keyword(s):  
Pacific Salmon ◽  
Stream Water ◽  
Puget Sound ◽  
Fish Passage ◽  
Washington State ◽  
Trophic Dynamics ◽  
Longitudinal Distribution ◽  
Physical Habitat ◽  
Upstream Migration ◽  
Lowland Streams

We identified and characterized barriers to the upstream distribution by prickly sculpin (Cottus asper) and coastrange sculpin (Cottus aleuticus), based on their longitudinal distribution in 11 streams in the Puget Sound lowlands of Washington State. Eight streams had upstream limits associated with particular instream structures, and these were compared to distinguish features of barriers and non-barriers. In seven streams perch height greater than 15 cm resulted in a complete barrier. In one stream water velocity >4 m·s−1 created a partial barrier. Five of the eight barriers were one- or two-step fish ladders installed to facilitate upstream passage of Pacific salmon and trout. Water quality, physical habitat, and the presence of other fishes were not related to the presence or absence of sculpin species. Fish passage criteria in western North American streams are based on the swimming abilities of Pacific salmon and trout, without consideration for other, less motile native fishes. Structures installed to surmount previously identified impediments to upstream migration continue to inhibit sculpin movement, resulting in loss of upstream habitats for adults, with potential consequences to population size and trophic dynamics.

scholarly journals Technical fishway passage structures provide high passage efficiency and effective passage for adult Pacific salmonids at eight large dams

PLoS ONE ◽  
2021 ◽  
Vol 16 (9) ◽  
pp. e0256805
Author(s):  
Matthew L. Keefer ◽  
Michael A. Jepson ◽  
Tami S. Clabough ◽  
Christopher C. Caudill
Keyword(s):  
Sockeye Salmon ◽  
River System ◽  
Fish Passage ◽  
Passage Time ◽  
Management Approach ◽  
Upstream Migration ◽  
65 H ◽  
Species Specific ◽  
Almost All ◽  
Passage Efficiency

Fishways have been widely used for upstream passage around human-built structures, but ‘success’ has varied dramatically. Evaluation of fishway success has typically been conducted at local scales using metrics such as fish passage efficiency and passage time, but evaluations are increasingly used in broader assessments of whether passage facilities meet population-specific conservation and management objectives. Over 15 years, we monitored passage effectiveness at eight dams on the Columbia and Snake rivers for 26,886 radio-tagged spring-summer and fall Chinook Salmon O. tshwaytscha, Sockeye Salmon O. nerka, and summer steelhead O. mykiss during their migrations to spawning sites. Almost all fish that entered dam tailraces eventually approached and entered fishways. Tailrace-to-forebay passage efficiency estimates at individual dams were consistently high, averaging 0.966 (SD = 0.035) across 245 run×year×dam combinations. These estimates are among the highest recorded for any migratory species, which we attribute to the scale of evaluation, salmonid life history traits (e.g., philopatry), and a sustained adaptive management approach to fishway design, maintenance, and improvement. Full-dam fish passage times were considerably more variable, with run×year×dam medians ranging from 5–65 h. Evaluation at larger scales provided evidence that fishways were biologically effective, e.g., we observed rapid migration rates (medians = 28–40 km/d) through river reaches with multiple dams and estimated fisheries-adjusted upstream migration survival of 67–69%. However, there were substantive uncertainties regarding effectiveness. Uncertainty about natal origins confounded estimation of population-specific survival and interpretation of apparent dam passage ‘failure’, while lack of post-migration reproductive data precluded analyses of delayed or cumulative effects of passing the impounded system on fish fitness. Although the technical fishways are effective for salmonids in the Columbia-Snake River system, other co-migrating species have lower passage rates, highlighting the need for species-specific design and evaluation wherever passage facilities impact fish management and conservation goals.

scholarly journals Fish Upstream Passage through Gauging Stations: Experiences with Iberian Barbel in Flat-V Weirs

Fishes ◽  
2021 ◽  
Vol 6 (4) ◽  
pp. 81
Author(s):  
Francisco Javier Sanz-Ronda ◽  
Francisco Javier Bravo-Córdoba ◽  
Ana García-Vega ◽  
Jorge Valbuena-Castro ◽  
Andrés Martínez-de-Azagra ◽  
...  
Keyword(s):  
River Discharge ◽  
Water Drop ◽  
Fish Passage ◽  
Water Levels ◽  
Fish Migration ◽  
Target Species ◽  
Flow Conditions ◽  
Cfd Models ◽  
Computational Fluid Dynamics Cfd ◽  
Hydraulic Barriers

The monitoring of river discharge is vital for the correct management of water resources. Flat-V gauging weirs are facilities used worldwide for measuring discharge. These structures consist of a small weir with a triangular cross-section and a flat “V”-shaped notch. Their extensive use is a consequence of their utility in the measurement of both low and high flow conditions. However, depending on their size, local morphology and river discharge can act as full or partial hydraulic barriers to fish migration. To address this concern, the present work studies fish passage performance over flat-V weirs considering their hydraulic performance. For this, radio-tracking and video-monitoring observations were combined with computational fluid dynamics (CFD) models in two flat-V weirs, using Iberian barbel (Luciobarbus bocagei) as the target species. Results showed that fish passage is conditioned by both hydraulic and behavioral processes, providing evidence for scenarios in which flat-V weirs may act as full or partial barriers to upstream movements. For the studied flat-V weirs, a discharge range of 0.27–8 m3/s, with a water drop difference between upstream and downstream water levels lower than 0.7 m and a depth downstream of the weir of higher than 0.3 m can be considered an effective passage situation for barbels. These findings are of interest for quantifying flat-V weir impacts, for engineering applications and for establishing managing or retrofitting actions when required.

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