<?xml version="1.0" encoding="ISO-8859-1"?><article xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<front>
<journal-meta>
<journal-id>1692-3324</journal-id>
<journal-title><![CDATA[Revista Ingenierías Universidad de Medellín]]></journal-title>
<abbrev-journal-title><![CDATA[Rev. ing. univ. Medellín]]></abbrev-journal-title>
<issn>1692-3324</issn>
<publisher>
<publisher-name><![CDATA[Universidad de Medellín]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S1692-33242021000200263</article-id>
<article-id pub-id-type="doi">10.22395/rium.v20n39a15</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Biological and Physiochemical Conditions of the Surface Waters of the Cauca River in the Urban Area of Popayán, Colombia]]></article-title>
<article-title xml:lang="es"><![CDATA[Condiciones biológicas y fisicoquímicas de las aguas superficiales del río Cauca en el área urbana de Popayán, Colombia]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Padilla Moreno]]></surname>
<given-names><![CDATA[Rafael Mauricio]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Ospina Parra]]></surname>
<given-names><![CDATA[Carlos Alberto]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universitaria Colegio Mayor del Cauca  ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Colombia</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidad de Manizales  ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Colombia</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>12</month>
<year>2021</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>12</month>
<year>2021</year>
</pub-date>
<volume>20</volume>
<numero>39</numero>
<fpage>263</fpage>
<lpage>277</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_arttext&amp;pid=S1692-33242021000200263&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_abstract&amp;pid=S1692-33242021000200263&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_pdf&amp;pid=S1692-33242021000200263&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract The homes and companies located on the banks of the Cauca River have altered the conditions of the quality of the water generated by residual discharges. Therefore, this paper proposes to analyze the biological and physicochemical conditions of the surface waters that cross the urban area of Popayán, Colombia, and determine if they are suitable for human consumption. For this, an in-situ sampling was carried out in the two river stations. The two points were covered taking into account the dry and rainy seasons. At each point, the parameters were measured to calculate the contamination indicators. Likewise, Ph, diluted oxygen, conductivity and temperature parameters were measured, also other physicochemical parameters such as total alkalinity, total hardness, total phosphorus and suspended total solids were measured as well as the microbiological parameters like total coliforms. It was found that the water source contains high levels of pollutant load and that biological discharge is one of the main causes that alters the quality of the water for drinking. The number of macroinvertebrates in the river decreases by 48% as the river advances through the urban area of the city. According to the BMWP values, highly contaminated carbonated waters enter the urban area. However, due to the flow throughout the water source, the Cauca River can regulate the pollution load according to the result evidenced in the Icomi, Icomo, and Icosus indices.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen Los hogares y empresas ubicadas en la rivera del río Cauca han alterado las condiciones de calidad del agua debido al desecho de aguas residuales. Por lo tanto, este artículo propone analizar las condiciones biológicas y fisicoquímicas de las aguas superficiales que cruzan el área urbana de Popayán, Colombia, con el fin de determinar si son aptas para consumo humano. Para ello, se recolectaron pruebas in situ en ambas estaciones. Los dos puntos fueron cubiertos teniendo en cuenta las temporadas seca y lluviosa. En cada punto, los parámetros fueron medidos con el fin de calcular los indicadores de contaminación. De igual manera, el Ph, el oxígeno diluido, las conductividad y la temperatura fueron medidos; así como otros parámetros fisicoquímicos como alcalinidad total, dureza total, fósforo total y sólidos suspendidos totales. También se midieron parámetros biológicos como la presencia total de coliformes. Se encontró que la fuente de agua contiene altos niveles de carga contaminante y que la descarga biológica es una de las principales razones por las que se altera la calidad del agua para su consumo. El número de macroinvertebrados en el río disminuye en un 48 % a medida que el río avanza por el área urbana de la ciudad. De acuerdo a los valores de BMWP, aguas carbonatadas altamente contaminadas ingresan a la ciudad. Sin embargo, debido al flujo a través de la fuente hídrica, el río Cauca puede regular su carga contaminante según lo que se evidencia en los índices Icomi, Icomo e Icosus.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[coliform]]></kwd>
<kwd lng="en"><![CDATA[physicochemical conditions of sweet water, riverbanks, biological discharges in rivers]]></kwd>
<kwd lng="es"><![CDATA[coliformes]]></kwd>
<kwd lng="es"><![CDATA[condiciones fisicoquímicas del agua dulce, riberas, descarga biológica en ríos]]></kwd>
</kwd-group>
</article-meta>
</front><back>
<ref-list>
<ref id="B1">
<label>[1]</label><nlm-citation citation-type="book">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Hoekstra]]></surname>
<given-names><![CDATA[Arjen Y.]]></given-names>
</name>
</person-group>
<source><![CDATA[The water footprint assessment manual: setting the global stan- dard]]></source>
<year>2011</year>
<page-range>203</page-range><publisher-loc><![CDATA[London ; Washington, DC ]]></publisher-loc>
<publisher-name><![CDATA[Earthscan]]></publisher-name>
</nlm-citation>
</ref>
<ref id="B2">
<label>[2]</label><nlm-citation citation-type="">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Addo-Bediako]]></surname>
<given-names><![CDATA[Abraham]]></given-names>
</name>
<name>
<surname><![CDATA[Malakane]]></surname>
<given-names><![CDATA[Karabo]]></given-names>
</name>
</person-group>
<source><![CDATA[Preliminary assessment of chemical elements in sediments and larvae of gomphidae (Odonata) from the blyde river of the olifants river system, South Africa]]></source>
<year>2020</year>
</nlm-citation>
</ref>
<ref id="B3">
<label>[3]</label><nlm-citation citation-type="">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Cao]]></surname>
<given-names><![CDATA[Xiaofeng]]></given-names>
</name>
</person-group>
<source><![CDATA[Adaptive variations of sediment microbial communities and indication of fecal-associated bacteria to nutrients in a regulated urban river]]></source>
<year>2020</year>
</nlm-citation>
</ref>
<ref id="B4">
<label>[4]</label><nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[N]]></surname>
<given-names><![CDATA[Moya]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Evaluación de la calidad ecológica de los ríos Quirpinchaca y Cachimayu usando macroinvertebrados como bioindicadores de contaminación]]></article-title>
<source><![CDATA[Scielo.Org.Bo]]></source>
<year>2019</year>
<volume>17</volume>
<page-range>11-22</page-range></nlm-citation>
</ref>
<ref id="B5">
<label>[5]</label><nlm-citation citation-type="">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Florini]]></surname>
<given-names><![CDATA[Styliani]]></given-names>
</name>
</person-group>
<source><![CDATA[Factors influencing the concentration of fecal coliforms in oysters in the river Blackwater Estuary, UK]]></source>
<year>2020</year>
</nlm-citation>
</ref>
<ref id="B6">
<label>[6]</label><nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Ronell]]></surname>
<given-names><![CDATA[S.H. Bridgemohan]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Identifying the primary sources of fecal contamination along the beaches and rivers of Trinidad]]></article-title>
<source><![CDATA[Journal of Water and Health]]></source>
<year>2020</year>
<volume>18</volume>
<numero>2</numero>
<issue>2</issue>
<page-range>229-38</page-range></nlm-citation>
</ref>
<ref id="B7">
<label>[7]</label><nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Gemeda]]></surname>
<given-names><![CDATA[Fekede Terefe]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Physicochemical characterization of effluents from in- dustries in Sabata town of Ethiopia]]></article-title>
<source><![CDATA[Heliyon]]></source>
<year>2020</year>
<volume>6</volume>
<numero>8</numero>
<issue>8</issue>
</nlm-citation>
</ref>
<ref id="B8">
<label>[8]</label><nlm-citation citation-type="">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Serrano]]></surname>
<given-names><![CDATA[Ligia de Oliveira]]></given-names>
</name>
</person-group>
<source><![CDATA[A new approach to use load duration curves to evalu- atewater quality: A study in the Doce River Basin, brazil]]></source>
<year>2020</year>
</nlm-citation>
</ref>
<ref id="B9">
<label>[9]</label><nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Shukla]]></surname>
<given-names><![CDATA[Bishnu Kant]]></given-names>
</name>
<name>
<surname><![CDATA[Kumar Sharma]]></surname>
<given-names><![CDATA[Pushpendra]]></given-names>
</name>
<name>
<surname><![CDATA[Asif Khan]]></surname>
<given-names><![CDATA[Mohd]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Physico- Chemical Study of Some Surface Water Bodies of Punjab]]></article-title>
<source><![CDATA[Journal of Physics: Con- ference Series]]></source>
<year>2020</year>
<volume>1531</volume>
<numero>1</numero>
<issue>1</issue>
<page-range>12121</page-range></nlm-citation>
</ref>
<ref id="B10">
<label>[10]</label><nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Przybylska]]></surname>
<given-names><![CDATA[Joanna]]></given-names>
</name>
<name>
<surname><![CDATA[Kaleta]]></surname>
<given-names><![CDATA[Joanna]]></given-names>
</name>
<name>
<surname><![CDATA[Koz&#322;owski]]></surname>
<given-names><![CDATA[Rafa&#322;]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Impact of Cedzyna Reser- voir on Selected Physicochemical Parameters of River Water Quality (Swietokrzyskie Mountains, Poland)]]></article-title>
<source><![CDATA[Chemistry, Didactics, Ecology, Metrology]]></source>
<year>2020</year>
<volume>24</volume>
<numero>1</numero>
<issue>1</issue>
<page-range>117-25</page-range></nlm-citation>
</ref>
<ref id="B11">
<label>[11]</label><nlm-citation citation-type="">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Desrosiers]]></surname>
<given-names><![CDATA[Mélanie]]></given-names>
</name>
<name>
<surname><![CDATA[Pinel-Alloul]]></surname>
<given-names><![CDATA[Bernadette]]></given-names>
</name>
<name>
<surname><![CDATA[Spilmont]]></surname>
<given-names><![CDATA[Charlotte]]></given-names>
</name>
</person-group>
<source><![CDATA[Selection of macroinvertebrate indices and metrics for assessing sediment quality in the st. Lawrence river (qc, Canada)]]></source>
<year>2020</year>
</nlm-citation>
</ref>
<ref id="B12">
<label>[12]</label><nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Kakouei]]></surname>
<given-names><![CDATA[Karan]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Climate model variability leads to uncertain predictions of the future abundance of stream macroinvertebrates]]></article-title>
<source><![CDATA[Scientific Reports]]></source>
<year>2020</year>
<volume>10</volume>
<numero>1</numero>
<issue>1</issue>
<page-range>2520</page-range></nlm-citation>
</ref>
<ref id="B13">
<label>[13]</label><nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Eriksen]]></surname>
<given-names><![CDATA[Tor Erik]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Ecological condition, biodiversity and major environmental challenges in a tropical river network in the Bago District in South-central Myanmar: First insights to the unknown]]></article-title>
<source><![CDATA[Limnologica]]></source>
<year>2021</year>
<volume>86</volume>
<page-range>125835</page-range></nlm-citation>
</ref>
<ref id="B14">
<label>[14]</label><nlm-citation citation-type="">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Musonge]]></surname>
<given-names><![CDATA[Peace S.L.]]></given-names>
</name>
</person-group>
<source><![CDATA[Drivers of benthic macroinvertebrate assemblages in equa- torial alpine rivers of the Rwenzoris (Uganda)]]></source>
<year>2020</year>
</nlm-citation>
</ref>
<ref id="B15">
<label>[15]</label><nlm-citation citation-type="">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Gamarra Torres]]></surname>
<given-names><![CDATA[Oscar Andres]]></given-names>
</name>
</person-group>
<source><![CDATA[&#8220;Fuentes de contaminación estacionales en la cuenca del río Utcubamba, región Amazonas, Perú (Stationary sources of contamination in the basin of the Utcubamba, River on the Amazonas region, Perú)]]></source>
<year>2018</year>
<volume>25</volume>
<page-range>179-94</page-range></nlm-citation>
</ref>
<ref id="B16">
<label>[16]</label><nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Carolina Blandón]]></surname>
<given-names><![CDATA[Lisseth]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Calidad de las aguas superficiales en la microcuenca río Pire, municipio de Condega Nicaragua (Quality of surface waters in the Pire river micro- basin, in Condega municipality, Nicaragua)]]></article-title>
<source><![CDATA[Revista Científica de FAREM-Estelí]]></source>
<year>2019</year>
<page-range>58-64</page-range></nlm-citation>
</ref>
<ref id="B17">
<label>[17]</label><nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Al-Gheethi]]></surname>
<given-names><![CDATA[Adel]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Bacteria Load Assessment at Sungai Benut in Simpang Renggam]]></article-title>
<source><![CDATA[IOP Conference Series: Earth and Environmental Science]]></source>
<year>2020</year>
<volume>498</volume>
<numero>1</numero>
<issue>1</issue>
<page-range>12061</page-range></nlm-citation>
</ref>
<ref id="B18">
<label>[18]</label><nlm-citation citation-type="confpro">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Pradana]]></surname>
<given-names><![CDATA[Hendra Andiananta]]></given-names>
</name>
</person-group>
<source><![CDATA[Land Use Impact to Water Quality in Bedadung River, Indonesia]]></source>
<year>2020</year>
<volume>477</volume>
<numero>1</numero>
<conf-name><![CDATA[ IOP Conference Series: Earth and Environmental Science]]></conf-name>
<conf-loc> </conf-loc>
<issue>1</issue>
<page-range>12015</page-range></nlm-citation>
</ref>
<ref id="B19">
<label>[19]</label><nlm-citation citation-type="">
<collab>IDEAM-UNAL</collab>
<source><![CDATA[Variabilidad Climática y Cambio Climático en Colombia (Climate variabil- ity and climate change in Colombia)]]></source>
<year>2018</year>
<edition>1</edition>
<page-range>28</page-range><publisher-loc><![CDATA[Bogota D.C ]]></publisher-loc>
</nlm-citation>
</ref>
<ref id="B20">
<label>[20]</label><nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Rodriguez]]></surname>
<given-names><![CDATA[Jennifer]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Caracterización fisicoquímica del agua de la quebrada La Toma, de la ciudad de Neiva, Huila, Colombia (Physicochemical characterization of the water in the La Toma stream, in the city of Neiva, Huila, Colombia)]]></article-title>
<source><![CDATA[Teknos revista científica]]></source>
<year>2019</year>
<volume>19</volume>
<numero>1</numero>
<issue>1</issue>
<page-range>27-36</page-range></nlm-citation>
</ref>
<ref id="B21">
<label>[21]</label><nlm-citation citation-type="">
<collab>Alcaldía de Popayán</collab>
<source><![CDATA[Plan de Ordenamiento Territorial de Popayán]]></source>
<year>2013</year>
</nlm-citation>
</ref>
<ref id="B22">
<label>[22]</label><nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Casanova]]></surname>
<given-names><![CDATA[Juan]]></given-names>
</name>
<name>
<surname><![CDATA[Figueroa Casas]]></surname>
<given-names><![CDATA[Apolinar]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Determinación Del Caudal Ambiental Y Su Relación Con Variables Indicadoras De Calidad Del Recurso Hídrico (Determination of the Environmental Flow and its relationship with variables that indicate the Quality of the Water Resource)]]></article-title>
<source><![CDATA[Luna Azul]]></source>
<year>2015</year>
<volume>40</volume>
<page-range>5-24</page-range></nlm-citation>
</ref>
<ref id="B23">
<label>[23]</label><nlm-citation citation-type="book">
<collab>IDEAM</collab>
<source><![CDATA[Estudio Nacional del Agua 2010 (National study of water 2010), Instituto de Hidrología, Meteorología y Estudios Ambientales]]></source>
<year>2010</year>
<page-range>421</page-range><publisher-loc><![CDATA[Bogota D.C. ]]></publisher-loc>
<publisher-name><![CDATA[Instituto de Hidrología, Meteorología y Estudios Ambientales]]></publisher-name>
</nlm-citation>
</ref>
<ref id="B24">
<label>[24]</label><nlm-citation citation-type="book">
<collab>Departamento Administrativo Nacional de Estadística DANE</collab>
<source><![CDATA[National series of population by area, for the period 2018 - 2070. Tech]]></source>
<year>2020</year>
<publisher-loc><![CDATA[Bogota D.C. ]]></publisher-loc>
<publisher-name><![CDATA[Departamento Ad- ministrativo Nacional de Estadística]]></publisher-name>
</nlm-citation>
</ref>
<ref id="B25">
<label>[25]</label><nlm-citation citation-type="">
<collab>Alcaldía de Popayán</collab>
<source><![CDATA[Nuestra Geografía (Our Geography)]]></source>
<year>2020</year>
</nlm-citation>
</ref>
<ref id="B26">
<label>[26]</label><nlm-citation citation-type="book">
<source><![CDATA[Información estadística Contexto regional Departamento del Cauca Municipios de Popayán y Sucre (Statistical information regional context, Department of Cauca Municipalities of Popayán and Sucre)]]></source>
<year>2016</year>
<page-range>23</page-range><publisher-loc><![CDATA[Bogota D.C. ]]></publisher-loc>
<publisher-name><![CDATA[corporación humanas-centro regional de derechos humanos y justicia de género]]></publisher-name>
</nlm-citation>
</ref>
<ref id="B27">
<label>[27]</label><nlm-citation citation-type="">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Ramírez]]></surname>
<given-names><![CDATA[.]]></given-names>
</name>
<name>
<surname><![CDATA[Restrepo]]></surname>
<given-names><![CDATA[R.]]></given-names>
</name>
<name>
<surname><![CDATA[Viña]]></surname>
<given-names><![CDATA[G.]]></given-names>
</name>
</person-group>
<source><![CDATA[Cuatro índices de contaminación para caracterización de aguas continentales. formulaciones y aplicación]]></source>
<year>1997</year>
</nlm-citation>
</ref>
<ref id="B28">
<label>[28]</label><nlm-citation citation-type="">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Ramírez]]></surname>
<given-names><![CDATA[R.]]></given-names>
</name>
<name>
<surname><![CDATA[Cuercuera]]></surname>
<given-names><![CDATA[M]]></given-names>
</name>
</person-group>
<source><![CDATA[Índices de contaminación para caracterización de aguas continentales y vertimientos. Formulaciones. (Pollution indicator for characterization of continental waters and discharges. Formulations)]]></source>
<year>2014</year>
</nlm-citation>
</ref>
<ref id="B29">
<label>[29]</label><nlm-citation citation-type="">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Roldán Pérez]]></surname>
<given-names><![CDATA[Gabriel]]></given-names>
</name>
<name>
<surname><![CDATA[Ramírez Restrepo]]></surname>
<given-names><![CDATA[John Jairo]]></given-names>
</name>
</person-group>
<source><![CDATA[Fundamentos de limnología neotropical (Neotropical Limnology Foundations)]]></source>
<year>2008</year>
</nlm-citation>
</ref>
<ref id="B30">
<label>[30]</label><nlm-citation citation-type="">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Fernández]]></surname>
<given-names><![CDATA[Nelson]]></given-names>
</name>
<name>
<surname><![CDATA[Ramos]]></surname>
<given-names><![CDATA[Gabriel]]></given-names>
</name>
<name>
<surname><![CDATA[Solano]]></surname>
<given-names><![CDATA[Fredy]]></given-names>
</name>
</person-group>
<source><![CDATA[Una herramienta informática para el análisis y valoración de la calidad del agua (A informatic tool for the analysis and assessment of water quality)]]></source>
<year>2004</year>
<publisher-loc><![CDATA[Bucaramanga, Colombia ]]></publisher-loc>
</nlm-citation>
</ref>
</ref-list>
</back>
</article>
