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dc.contributor.authorGolez, Nelson V.
dc.contributor.authorBorlongan, Ilda G.
dc.contributor.authorLorque, Felizardo
dc.coverage.spatialIloiloen_US
dc.date.accessioned2021-11-11T00:53:34Z
dc.date.available2021-11-11T00:53:34Z
dc.date.issued2010-01
dc.identifier.citationGolez, N. V. , Borlongan, I. G. & Lorque, F. (2010). Hydrological characteristics assessment of Jalaur River system and its bottom sediments, Province of Iloilo, Panay Island. Silliman Journal, 51(1), 159-189.en_US
dc.identifier.issn00375284
dc.identifier.urihttps://hdl.handle.net/20.500.12852/1673
dc.descriptionJournal articleen_US
dc.description.abstractRivers are important to civilization because river water can be diverted for agricultural irrigation, industry, hygiene, and related uses. Most rivers have varied hydrological characteristics like water depth, flow rate and volume discharges when measured during the wet and dry season. In addition, rivers do carry dissolved minerals and organic compounds. A hydrologic monitoring was done in strategic sampling points along the river to cover the upstream (Banban, Pequeño, Calinog), midstream (Moroboro, Dingle) with sub-points before and after the dam (Imbang Pequeho—near Passi Sugar Central and Licuan, Dingle next to the National Power Corporation) and downstream (Nabitasan, Leganes) sections of the Jalaur River. Sampling was done three times per season (dry and wet seasons) at each of the five sampling sites. Water level and flow rate variations were observed during the occurrence of a tropical storm and torrential rains brought by a typhoon. Depth ranges from 0.45 meters (dry season) to 6.0 meters (wet season). The river current in the upstream station was greater than the mid and downstream stations at a rate of 2.5, 0.22 and 0.33 m/sec in the wet season and 0.37, 0.2 and 0.08m/sec in the dry season, respectively. River discharges were also higher (108.5, 41.04, and 19.99 m3/sec) during the wet season than in the dry season (3.89, 29.40, and 28.08 m3/sec) for the upper, middle, and downstream stations. Water transparency during the wet season ranged from 5-15 cm whereas 31-55 cm was recorded during the dry season. Color of the water changed from murky brown to brown during the wet season and from clear to light green during the dry months from Calinog down to Leganes except in Imbang, Pequeño-San Enrique site with very undesirable color (black) and odor (ammoniacal) during dry months (milling season). Highest precipitation of 317.24 mm in the wet season and barely 5.2 mm during the dry season was recorded. Bottom sediments were found to be sand to sandy loam, to silty loam from upstream to downstream, respectively. Soil pH was neutral to slightly basic (7.10-8.17). Available phosphorus measurements were higher (11.22-30.50 ppm P) in soils from Calinog to Leganes while the amount of available iron (Fe) increased as the concentration of acetate soluble sulfate decreased, except in Moroboro, Dingle and Nabitasan, Leganes that showed an abnormal increase twice the initial value. The organic matter content of the sediments taken from all sampling sites yielded a wide range of 1.31—4.53 % that decreased to 0.04 from 2.46 % in all sampling sites from wet to dry season. Highest value was in the midstream with values ranging from 4.53—2.46 %. The results of this study show that sediment agitation by recreational activity and storm surges associated with the drycold season are responsible for the impact on water quality and not recreational users directly. This implies that a follow up study and continuous monitoring is needed to ensure the safety of all end users of the river system, otherwise its use in the future will be limited to quarrying of concreting and embankment materials for civil work projects.en_US
dc.language.isoenen_US
dc.publisherSilliman Universityen_US
dc.subject.lcshRiversen_US
dc.subject.lcshHydrologyen_US
dc.subject.lcshRiver sedimentsen_US
dc.subject.lcshSediments (Geology)en_US
dc.subject.lcshPhilippines--Iloilo (Province)en_US
dc.subject.lcshPhilippines--Panay Islanden_US
dc.titleHydrological characteristics assessment of Jalaur River system and its bottom sediments, Province of Iloilo, Panay Islanden_US
dc.typeArticleen_US
dc.citation.firstpage159en_US
dc.citation.lastpage189en_US
dc.citation.journaltitleSilliman Journalen_US
dc.citation.volume51en_US
dc.citation.issue1en_US
local.subjectHydrologyen_US
local.subjectPanay Islanden_US
local.subjectRiver systemen_US
local.subjectJalaur Riveren_US
local.relation.associatedcontenthttp://archive.su.edu.ph/assets/media/resources/sj%20issues/v51n1.pdf#page=160 Full text of Silliman Journal Volume 51(1), January to June 2010en_US


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