Mohammad Iqbal Maulana, Wahudin Diantoro, Abdul Latief Nurdin
Penelitian ini bertujuan untuk menganalisis pengendalian banjir di Kelurahan Sumur Panggang, Kecamatan Margadama, Kota Tegal. Pengendalian banjir adalah tugas yang kompleks dan harus di lakukan secara menyeluruh untuk mencapai hasil yang efektif. Penelitian ini menganalisis klasifikasi kali kemiri menggunakan metode kualitatif, melalui perhitungan curah hujan, perhitungan curah hujan per wilayah terdampak, dan perhitungan debit air sungai. Hasil penelitian menunjukan bahwa kali kemiri itu sendiri memiliki panjang total 2km, lebar 30cm, kedalaman sekitar 2m serta memiliki kemiringan 1 : 2 dari kedalaman sungai. Dan pada perhitungan curah hujan pada metode aljabbar dengan hasil 32,8 mm serta pada metode isohyet 32,71 mm hanya selisih beberapa mm. Serta pada perhitungan debit sungai kali kemiri dapat ditemukan 10,14 m3/detik.Berdasarkan hasil penelitian, di sarankan untuk lebih meningkatkan kesadaran masyarakat mengenai pengendalian banjir dan cara mengurangi dampaknya, serta melakukan pembersihan rutin terkait saluran drainase di Kelurahan Sumur Panggang, Kecamatan Margadana, Kota Tegal
Abstract Aiming at the common problems on flood control impact assessment of linear projects, combined with practical work experience, this paper summarizes and analyzes the characteristics and main impact types of linear projects involving rivers and embankments in recent years, and puts forward the key points of river and embankment impact assessment of linear projects in Zhejiang Province from the aspects of early site selection, construction mode, control factors and remedial measures. It is helpful to improve the quality of flood control impact assessment report, and provide reference for the design, construction, consultation and review of water conservancy department.
In recent years, the water and sediment pattern of the Yellow River has changed significantly, and a preliminary water and sediment regulation system was constructed. Based on a summary of the regulation principles of water and sediment in the Middle Yellow River, this paper proposes three key technologies to determine the water and sediment control thresholds, the artificial creation of a long-distance density current, and an engineering regulation for water and sediment control of the Yellow River. Taking the actual flood and sedimentation regulation of the Yellow River Basin in 2018 as an example, the practical applications of these relevant technologies are analyzed. This study provides an important theoretical and practical reference for the flood and sediment regulation of sediment-laden rivers in arid and semi-arid areas during flood season.
Abstract. Spain is one of the world's countries with a large number of reservoirs per inhabitant. This intense regulation of the fluvial network during the 20th century has resulted in a decrease in flood events, a higher availability of water resources, and a high development of the irrigated crop area, even in the drier regions. For decades, flood perception was reduced since the development of reservoirs protected the floodplains of river; this resulted in later occupation of soil by urban, agricultural and industrial uses. In recent years, an increasing perception of flood events is observed, associated to the higher damage associated to extreme events in the now occupied areas, especially in coastal watersheds. This work shows the change on flood risk in the coastal areas of three hydrographic basins in Andalusia (South Spain) during the reservoir expansion period: the Guadalete, Guadalquivir and Guadalhorce river basins. The results differentiate the impact of the regulation level on both the cumulative distribution functions of the fluvial discharge near the river mouth, for different time scales, and the associated damage related to the enhanced soil occupation during this period. The different impact on the final medium and long term flood risk is also assessed in terms of the storage capacity per unit area throughout the basins, the effective annual runoff/precipitation index, the frequency of sea storms, and the human factor (change in social perception of floods), for different intervals in the flood extreme regime. The implications for adaptation actions is also assessed.
arly twentieth century environmental and sanitary engineering campaigns implicated three major areas in Zanzibar. As records from the Department of Medicine and Public Health and other administrative files from the Provincial Administration Department and Public Works Department show, they included the reclamation of the Creek and swampy ground. The filling of natural depressions caused by quarrying works started from 1930. These measures were a response to the growing medical understanding that malaria was spread by mosquitoes. From the early twentieth century, Zanzibar decided to embark on anti-malarial campaigns which focussed on controlling both Anopheles gambiae and A. funestus. These two malaria species bred in swamps, banks of rivers, potholes, shallow depressions, in hoof-prints of cattle, earthen jars, sailing boats, canoes, lighters, borrow-pit and flooded rice-fields. In 1913, the Colonial Office sent Professor W. J. Ritchie Simpson, a British physician and a pioneer in tropical medicine, to visit British colonies in East Africa. Simpson, who formerly worked as a health officer for Calcutta, India in the 1890s and was a founder of the Journal of Tropical Medicine in 1898, was from 1913 an advisor of the Secretary of State for the Colonies on health matters. He visited Zanzibar, Kenya and Uganda to investigate health conditions, and to propose measures to be taken to improve health of the “native” population, (Indians, Arabs and Africans). Simpson’s survey confirmed that mosquitoes bred during rainy seasons. He recommended to the Zanzibar authorities that they refill the Creek in order to stop epidemics. The anti-malarial works that focused on reclamation of land and swamps had just started in the United States of America. Since the early 1900s, the United States had been involved in the campaigns against yellow fever in the Panama Canal area.