scholarly journals ANALISA PENGENDALIAN BANJIR AKIBAT PELUAPAN DEBIT ALIRAN DENGAN PERKUATAN TEBING TIPE SHEET PILE “Studi Kasus Sungai Batang Lumpo Kabupaten Pesisir Selatan”

2020 ◽  
Vol 3 (2) ◽  
pp. 259-268
Author(s):  
Nofrizal Nofrizal ◽  
Febi Silfia
Keyword(s):  
Surface Runoff ◽  
River Discharge ◽  
Catchment Area ◽  
Soil Surface ◽  
Rational Method ◽  
Preliminary Survey ◽  
Sheet Pile ◽  
Flood Discharge ◽  
Flood Condition ◽  
Pile Length

Flooding ia caused by the increased volume of water’s volume in the river or lake so that water is out of its natural limits. The flooding is mostly caused by inadequate river capacity to accommodate river discharge. The amount of river discharge at the time of flood is caused by the increasing amount of surface runoff from the rains that fall in the catchment area. Based on the preliminary survey conducted, it was found that the frequency of flooding in the Batang Lumpo river area is 2-3 times a year with a height ranging from 0.5 to 1.5 meters from the soil surface with the duration of inundation ranges from 4 to 6 hours. Areas affected by flooding ranging from the area of Nagari Taratak Tengah Lumpo Kecamatan IV Jurai down to the downstream river at Nagari Pasar Baru Kecamatan Bayang. By the result of the analysis obtained flood discharge using Rational method Q 100 years = 237, 26 m³ / dt, high h = 2.7 m, the high value of W = 1.16 m length Sheet Pile in flood condition = 4.14 m, Maximum Moment Mmax = 6, 31 tm and sheet pile length in dry condition = 3.16 m, Mmax Moment = 7,125 t.m.

scholarly journals Analisis Pengendalian Puncak Banjir Menggunakan Kolam Retensi di DAS Batang Air Dingin Kota Padang

2020 ◽  
Vol 16 (1) ◽  
pp. 1
Author(s):  
Fajri Ramadhan ◽  
Yola Amelia ◽  
Revalin Herdianto ◽  
Elvi Roza Syofyan
Keyword(s):  
Return Period ◽  
Surface Runoff ◽  
River Discharge ◽  
River Flow ◽  
Storage Capacity ◽  
Large River ◽  
Hydraulic Modelling ◽  
Retention Pond ◽  
Flood Discharge ◽  
Local Residents

Batang Air Dingin Watershed is one of the watersheds in Padang City which is located at 00050’12,5” to 00050’22,5” South Latitude and 100023’35,85” to 100022’42,84” East Longitude has changed its function. Land in the area around the river flow results in greater surface runoff, which has the potential to cause erosion. Runoff that occurs in Batang Air Dingin Watershed area causes the river to shrink during the dry season causing the local residents’ wells to be drought, while in the rainy season the river discharge value used is obtained. Through the calculation of the hydrograps discharge using the HSS Nakayasu and HEC-HMS methods whose values are validated by the field flood discharge. Hydraulic modelling using HEC-RAS software with discharge from HSS Nakayasu method. The retention pond plan is based on the amount of runoff that cannot be accommodated by the original storage capacity of Batang Air Dingin Watershed during 100 year return period was 1212, 94 m3/second with large river storage capacity is 1205,317 m3/second. The debit that can be deducted by making a retention pond is 30,5%.

scholarly journals Analysis Of Surface Runoff Potential At Medan Industrial Estate Use SCS Method

2018 ◽  
Vol 2 (1) ◽  
Author(s):  
Yudha Hanova
Keyword(s):  
Return Period ◽  
Surface Runoff ◽  
Catchment Area ◽  
Flood Mitigation ◽  
Effective Rainfall ◽  
Flood Discharge ◽  
Industrial Estate ◽  
Runoff Potential ◽  
Alternative Solutions ◽  
Scs Cn

<p><em>Flood disaster at the region Medan Industrial Estate resulted the losses in infrastructure, farming, and residence. </em><em></em></p><p><em>Flood discharge at Medan Industrial Estate are influenced by surface runoff from several catchment area in Medan Industrial Estate. Analysis of potential for surface runoff is expected to provide input and information to find alternative solutions appropriate flood mitigation.</em> <em>Discharge of surface runoff were analyzed using SCS method with the return period of 1, 2 and 5 Years. Rainfall data are obtained BMKG Stations of Maritim Belawan</em>. <em>Effective rainfall calculated using SCS-CN method on condition AMC III (wet conditions). The results of the analysis of the potential for surface runoff maximum for 1 year return period on DAS I, II, III, IV, V, and VI was 17.631 m<sup>3</sup>/s</em><em>, 22.183 m<sup>3</sup>/s, 12.621 m<sup>3</sup>/s, 11.338 m<sup>3</sup>/s, 18.224 m<sup>3</sup>/st, dan 15.839 m<sup>3</sup>/s.</em> <em>To return period of 2 years was 31.234 m<sup>3</sup>/sec,</em> <em>39.235 m<sup>3</sup>/s, 22.351 m<sup>3</sup>/det, 20.044 m<sup>3</sup>/det, 32.300 m<sup>3</sup>/det, dan 28.097 m<sup>3</sup>/det. F</em><em>or the return period of 5 years is 45.346 m<sup>3</sup>/s,</em> <em>56.926 m<sup>3</sup>/s, 32.446 m<sup>3</sup>/s, 29.076 m<sup>3</sup>/s, 46.903 m<sup>3</sup>/s, dan 40.816 m<sup>3</sup>/s.</em></p>

scholarly journals Hydrological Modeling in an Ungauged Basin of Central Vietnam Using SWAT Model

2016 ◽  
Author(s):  
Ammar Rafiei Emam ◽  
Martin Kappas ◽  
Linh Hoang Khanh Nguyen ◽  
Tsolmon Renchin
Keyword(s):  
Soil Erosion ◽  
Natural Hazards ◽  
Crop Yield ◽  
Surface Runoff ◽  
River Discharge ◽  
Hydrological Modeling ◽  
Assessment Tools ◽  
Actual Evapotranspiration ◽  
Ungauged Basin ◽  
Central Vietnam

Abstract. Hydrological modeling of ungauged basins which have a high risk of natural hazards (e.g., flooding, droughts) is always imperative for policymakers and stakeholders. The Aluoi district in Hue province is a representative case study in Central Vietnam, as it is under extreme pressure of natural and anthropogenic factors. Flooding, soil erosion and sedimentation are the main hazards in this area, which threaten socio-economic activities not only in this district but also those of the area downstream. To evaluate the water resources and risk of natural hazards, we used Soil and Water Assessment Tools (SWAT) to set up a hydrological model in the ungauged basin of Aluoi district. A regionalization approach was used to predict the river discharge at the outlet of the basin. The model was calibrated in three time scales: daily, monthly and yearly by river discharge, actual evapotranspiration (ETa) and crop yield, respectively. The model was calibrated with Nash-Sutcliff and an R2 coefficients greater than 0.7, in daily and monthly scales, respectively. In the yearly scale, the crop yield inside the model was calibrated and validated with RMSE less than 2.4 ton/ha, which showed the high performance of the model. The water resource components were mapped temporally and spatially. The outcomes showed that the highest mean monthly surface runoff, 700 to 765 mm, between September and November, resulted in extreme soil erosion and sedimentation. The monthly average of actual evapotranspiration was the highest in May and lowest in December. Furthermore, installing "Best Management Practice" (BMPs) reduced surface runoff and soil erosion in agricultural lands. However, using event-based hydrological and hydraulically models in the prediction and simulation of flooding events is recommended in further studies.

scholarly journals Benefits of Embungs in the Rawa Pening Catchment Area for Reducing Tuntang River Flood Discharge

2018 ◽  
Vol 73 ◽  
pp. 08029
Author(s):  
Darsono Suseno ◽  
S Suripin ◽  
Budieny Hary ◽  
Cholifatul Afifah Risdiana ◽  
Pujiastuti Ratih ◽  
...  
Keyword(s):  
Catchment Area ◽  
Flood Control ◽  
Water Source ◽  
Raw Water ◽  
Sediment Control ◽  
Resources Management ◽  
Control Sediment ◽  
Central Java ◽  
Flood Discharge ◽  
River Flood

Rawa Pening is a natural lake as a source of water for Tuntang River which is used for hydropower, raw water source, main irrigation water source in Glapan weir located in Grobogan District, Central Java provinces. Rawa Pening will be developed as location of national and international ecotourism. An Optimal Water Resources Management is required with several studies. This study is the beginning of a series of studies planned to determine the potential of embungs and its utilization as flood control, sediment control of Rawa Pening and for reducing weeds growth.

Plot-scale wash-off of Cesium-137 and Strontium-90 after three decades since the Chernobyl accident

2020 ◽  
Author(s):  
Yoshifumi Wakiyama ◽  
Yasunori Igarashi ◽  
Yuichi Onda ◽  
Dmitry Samoilov ◽  
Hlib Lisovy ◽  
...  
Keyword(s):  
Surface Runoff ◽  
Soil Surface ◽  
Water Repellency ◽  
Sediment Discharge ◽  
Exclusion Zone ◽  
Runoff Water ◽  
Wild Fire ◽  
Strontium 90 ◽  
Cesium 137 ◽  
Level Sensor

&lt;p&gt;Long-term behaviors of Cesium-137 (&lt;sup&gt;137&lt;/sup&gt;Cs) and Strontium-90 (&lt;sup&gt;90&lt;/sup&gt;Sr) have been of great interest in Chernobyl and its downstream area. This study presents plot-scale observations of &lt;sup&gt;137&lt;/sup&gt;Cs and &lt;sup&gt;90&lt;/sup&gt;Sr wash-off in the Chernobyl exclusion zone since 2018 to date. Runoff plots were established on a pine forest in the Kopachi area (PF-KP), an abandoned farmland in the Korogod area (AF-KR) and a post wild fire territory in the Red Forest (WF-RF) in December 2017. Each runoff plot consists of eroding surface of 22.13 m length and 5 m width, a 30&amp;#176; V-notch weir with water level sensor for monitoring surface runoff and tanks for collecting runoff water and sediments. Since February 2018, runoff water and sediment samples trapped in the weir and tanks have been collected after rainfall events and analyzed for particulate &lt;sup&gt;137&lt;/sup&gt;Cs concentration, dissolved &lt;sup&gt;137&lt;/sup&gt;Cs concentration, and dissolved &lt;sup&gt;90&lt;/sup&gt;Sr concentration. Analyses of samples in 2, 4, and 3 wash-off events were completed for PF-KP, AF-KR, and WF-RF, respectively. The ash/litter on soil surface, soil of 0-1 cm depth, soil of 1-2 cm depth, and soil of 2-3 cm depth were sampled with a scraper plate and subject to measurements of &lt;sup&gt;137&lt;/sup&gt;Cs and &lt;sup&gt;90&lt;/sup&gt;Sr concentrations. &amp;#160;Total volume of surface runoff from PF-KP, AF-KR, and WF-RF were 0.97, 0.73, and 3.2 mm, respectively. Total sediment discharge from PF-KP, AF-KR, and WF-RF were 0.29, 0.015, 1.7 g m&lt;sup&gt;-2&lt;/sup&gt;, respectively. The runoff and sediment discharge from PF-KP and WF-RF were mainly observed in summer and attributed to severe water repellency of the surface soils. Total particulate &lt;sup&gt;137&lt;/sup&gt;Cs wash-off from PF-KP, AF-KR, and WF-RF were 51, 0.082, 270 Bq m&lt;sup&gt;-2&lt;/sup&gt;, respectively. Total dissolved &lt;sup&gt;137&lt;/sup&gt;Cs wash-off from PF-KP, AF-KR, and WF-RF were 7.4, 0.024, 9.8 Bq m&lt;sup&gt;-2&lt;/sup&gt;, respectively. Total dissolved &lt;sup&gt;90&lt;/sup&gt;Sr wash-off from PF-KP, AF-KR, and WF-RF were 55, 0.31, 230 Bq m&lt;sup&gt;-2&lt;/sup&gt;, respectively.&amp;#160; These results indicate that wild fire enhances surface runoff and sediment yield and result in greater wash-off of &lt;sup&gt;137&lt;/sup&gt;Cs and &lt;sup&gt;90&lt;/sup&gt;Sr. In comparisons between PF-KP and WF-RF, apparent Kd value for &lt;sup&gt;137&lt;/sup&gt;Cs at WF-RF was higher than at PF-KP. Ratio of dissolved &lt;sup&gt;137&lt;/sup&gt;Cs and &lt;sup&gt;90&lt;/sup&gt;Sr concentration to those in ash/litter layer at PF-KP was lower than those of WF-RF. The dissolution of these radionuclides into runoff water appeared to be restrained in the post wild-fire site.&lt;/p&gt;

Surface runoff contamination by chemicals initially incorporated below the soil surface

1993 ◽  
Vol 29 (3) ◽  
pp. 697-704 ◽  
Author(s):  
Rony Wallach ◽  
Rina Shabtai
Keyword(s):  
Surface Runoff ◽  
Soil Surface

Surface runoff, soil and nutrient losses from farming systems in the Australian semi-arid tropics

1996 ◽  
Vol 36 (8) ◽  
pp. 1003 ◽  
Author(s):  
M Dilshad ◽  
JA Motha ◽  
LJ Peel
Keyword(s):  
Surface Runoff ◽  
Soil Conservation ◽  
Soil Loss ◽  
Soil Surface ◽  
Farming Systems ◽  
Surface Characteristics ◽  
Control Surface ◽  
Arable Soils ◽  
North West ◽  
Semi Arid

Most soils suitable for dryland agriculture in north-west Australia occur in the Daly Basin. These are sesquioxidic soils which include red, yellow and grey earths, and soils related to yellow and red earths. The potential, for these arable soils to be degraded by highly erosive rainfalls, common to the region, is high. Farming practices strongly influence the soil surface characteristics (vegetation cover, roughness, soil strength), which in turn control surface runoff, and sediment detachment and transport. In studies conducted during 1984-89 in the Daly Basin, conventionally tilled catchments, produced 1.5-2 times more runoff and lost 1.5-6 times more soil than their no-tillage counterparts (all catchments were within soil conservation banks). In these conventionally tilled catchments, soil loss was <8.1 t/ha.year. Other studies in the region have shown that, without soil conservation banks, soil loss can be around 100/ha.year under conventional tillage. Little work, however, has been undertaken on farms in the Australian semi-arid tropics to study the movement of nutrients and herbicides (in ionic and adsorbed forms) and further research is warranted.

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