Retention Pool As Alternative For Flood Control Case Study Of Bapertarum Housing, Sumenep Regency

Indonesia is a water country with thousands of rivers and hundreds of deep seas. This causes Indonesia to become a country that is very prone to flooding. But basically, there are several factors that cause this to happen, namely: natural events, drainage damage and environmental degradation caused by human activity itself. Geographically, Bapetarum Housing is an area located in a rainwater catchment area so that it is prone to flood events. High rainfall intensity can cause flood inundation as high as 30 cm. The purpose of this study is to calculate the adequacy of the retention pond to cope with flooding. The procedure for collecting research data begins with analyzing the flood, namely primary and secondary data. Meanwhile, the data analysis techniques used are planning rain analysis, rainfall intensity, flood discharge analysis, retention pond capacity. The retention pond capacity is sufficient because the dimensions of the retention pond are larger than the volume of the retention pond capacity when the flood is 6750m3>6447m3. The retention pond is planned in the downstream area of the residential river with a pool area of 50 x 40 meters and a depth of 4.5 m. The bottom condition of the pond is saturated because it is always inundated with water, the infiltration rate is constant (fc). The constant infiltration for clayey soil type is 0.5 m/day, the infiltration volume rate that occurs at the bottom of the pond is 179 m3/hour, the volume is below the threshold 8283.21 m3, infiltration time is 46 hours.

Seasonal hydrological and water quality performance of individual and in-series stormwater infrastructures as treatment trains in cold climate

The performance of stormwater treatment trains and of their individual green infrastructure was evaluated near Montreal, Canada. Three treatment trains were studied: Train 1 – five bioretention cells in series with a wet retention pond; Train 2 – an infiltration trench in series with a dry detention pond and Train 3 – Train 2 in series with a wet retention pond. A total of 47 rain events were monitored to quantity the hydrological performance, while water quality samples were taken during 24 rainfall events. During the summer, the bioretention cells led to a reduction in runoff volumes varying from 8 to 100%. Overall, the three studied treatment trains and all of the individual infrastructures, except for the dry pond, provided reductions in the mean concentrations of total suspended solids, chemical oxygen demand, total nitrogen and total phosphorous. Results also showed that the use of a train of stormwater infrastructures can be more effective to reach Quebec's legislated targets than single infrastructures to remove those four contaminants, but only if the infrastructures are sequenced properly. Indeed, the addition of a dry basin at the end of Train 2 reduced the removal efficiency of the four studied contaminants.

The Revitalization of Makassar Urban Drainage System Based on Eco Drainage Retention Pond

One of the causes of flooding in Makassar City is the management of the water system that is not optimal. It is necessary to arrange a drainage system to overcome flooding in Makassar City. In this study the topography on Catchment area analysis, analysis of hydrology and hydraulics analysis. Modeling the distribution of flood performed using HEC-RAS applications. This research was conducted in the Tallo watershed which consists of the Upper Tallo sub-watershed and the Mangalarang sub-watershed. The results of the analysis of flood discharge in the Tallo Hilir sub-watershed are 523.76 m3/s and in the Mangalarang sub-watershed are 886.82 m3/s. The flood overflow of the Tallo River spread over 6.48 km2 of Manggala District, 0.31 km2 of Rappocini District, 4.24 km2 of Panakukang District, 3.37 km2 of Tallo District, 11.59 km2 of Tamalanrea District and 0.01 km2 of Biringkanaya District. The total area of flood distribution is 26 km2. The solution to overcome the flooding of the Tallo River with an environmentally sound drainage system, it is necessary to plan the construction of a retention pond in Tamalanrea District, with a normal total storage volume of 2.48 million m3 and a maximum capacity of 5.31 million m3. The construction of this retention pond can reduce 17.7 km2 of flood-affected area.

Long-Term Oxbow Lake Trophic State under Agricultural Best Management Practices

A key principle of agricultural best management practices (BMPs) is to improve water quality by reducing agricultural-sourced nutrients and associated eutrophication. Long-term (1998–2016) lake summer trophic state index (TSI) trends of an agricultural watershed with agricultural best management practices (BMPs) were assessed. Structural BMPs included vegetative buffers, conservation tillage, conservation reserve, a constructed wetland, and a sediment retention pond. TSI included Secchi visibility (SD), chlorophyll a (Chl), total phosphorus (TP), and total nitrogen (TN). Summer TSI 1977 was >80 in 1998–1999 (hypertrophic) and decreased over the first 10 years to TSI 1977 ≈ 75 (eutrophic). TSI 1977 decrease and changing TSI deviations coincided with vegetative buffers, conservation tillage, and conservation reserve. The TSI(SD) decrease (>90 to <70) coincided with vegetative buffers and TSI(TP) decrease (>90 to <75) coincided primarily with conservation tillage and the sediment retention pond. TSI(Chl) increase (<60 to >70) coincided with conservation tillage and vegetative buffer. Results indicate watershed-wide BMPs can modestly decrease summer trophic state through increased water transparency and decreased TP, but these changes are off-set by increases in chlorophyll a to reach a new stable state within a decade. Future research should assess algal nutrient thresholds, internal nutrient loading, and climate change effects.

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

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%.

REDUKSI DEBIT LIMPASAN DENGAN MENERAPKAN SISTEM EKODRAINASE PADA KAWASAN PERUMAHAN

<p><em>Rapid growth at the time of the event demanded space and resources. Changes in land use in green areas into residential areas which reduce natural infiltration areas which make it difficult for air to absorb and cause surface runoff. Based on these conditions, it is necessary to develop a rainwater management method to reduce flood discharge, either managed by being infused, collected or channeled out of the area with the smallest possible discharge. By implementing a drainage system with an environmental or ecodrainage perspective in the Karawaci Kingdom Park housing area, it is possible to reduce runoff discharge that occurs. Some of the ecodrainage technologies that are applied in the slumping areas are rainwater storage, infiltration wells, biopores, bioretension and retention ponds. Based on the results of the calculation of the housing runoff discharge value of 0.22286 m3/s. By implementing an ecodrainage system, it can reduce 52% of the total area discharge and the rest will flow into the retention pond before being run off to the receiving water bodies. Due to limited land, the pool storage capacity is 900 m3. </em></p>

Studi Kolam Retensi Sebagai Upaya Pengendalian Banjir Sungai Bruno Desa Sidomulyo Kecamatan Semen Kabupaten Kediri

Retention ponds function to fill time and can be combined with a pump or floodgates to cope with flooding. This study aims to determine the flood discharge that the Bruno River cannot accommodate. The method used is data from the research location and literature review of previous studies. Namely Hydrological Analysis of rainfall data for 10 years taken from the Kanyoran station. Until calculating the flood discharge plan with the Rational method. The Rational Method is one of the common methods used to estimate the peak flow rate. Results for a 50 year return period, get an excess of flood discharge of 64,363 m3 / s, duration of rain (t) 3.2 hours and a minimum storage volume of 378 580.32 m3 . Retention pond with dimensions plan K1 p = 300m, l = 130m, t = 2m, and K2 p = 300m, l = 125m, t = 2m. Kolam Retensi berfungsi untuk menampung air sementara waktu dan dapat dikombinasikan dengan pompa atau pintu air untuk menanggulangi banjir. Penelitian ini bertujuan untuk mengetahui debit banjir yang tidak dapat ditampung oleh sungai Bruno. Penelitian ini menggunakan Analisis Hidrologi terhadap data curah hujan selama 10 tahun yang diambil dari stasiun Kanyoran. Hingga menghitung debit banjir rencana dengan metode Rasional. Metode Rasional adalah Salah satu metode umum yang di gunakan untuk memperkirakan laju aliran puncak Hasil untuk kala ulang 50 tahun, didapatkan kelebihan debit banjir sebesar 64,363 m3/dtk, lama hujan (t) 3,2 jam dan volume tampungan minimal sebesar 378 580,32 m3 . Kolam Retensi direncanakan dengan dimensi K1 p = 300m, l = 130m, t = 2m, dan K2 p = 300m, l = 125m, t = 2m.