Water was the most important factor, if not managed properly can cause a harm, one of which was flood. Prevention of flood by optimizing drainage channels. The purpose was to review previous research on drainage planning, especially method used to calculate discharge flood design. The methods used were: Rational method, Weduwen method, Haspers method and Melchior method. Determination of each method depends on rainfall data, flow characteristics, and discharge data. Based on review, it was for calculating the design flood discharge was based on the area of the catchment area. The research area that has wide DAS 0

The Sriminosari village is a coastal village in East Lampung district that had mangrove forests. Now, mangrove forests of Sriminosari used as a mangrove ecotourism area and will be developed as a form of proper management to ensure the conservation and sustainability of rehabilitation while simultaneously pushing the economy of local communities. The purpose of this research is to calculate the ecotourism suitability index as a support in the development of mangrove ecotourism activities. This research used is survey methods and identification of ecotourism activities is carried out by visual identification and interview. The Observation station is determined by 5 stations are purposive. The results showed that mangrove ecosystem Sriminosari Village in the category of very fit (S1) at 5 stations with index value the suitability of tourism (IKW) at each station that is the station I of 76.92% in category (S1), station II of 89.74% in category (S1), station III of 89.74% in category (S1), station IV of 92.31% in category (S1), and station V of 92.31% in category (S1). The mangrove ecosystem Pandan Alas Sriminosari Village has the potential to be developed as an ecotourism mangrove.

Mangrove Avicennia Marina has important role in wave reduction. The purpose of this research were: (1) To know wave energy ratio in Indah Kapuk Beach and East Lampung Regency, Indonesia. (2) To know the influence of Avicennia Marina mangrove’s respiratory roots on wave energy reduction. Measurement of wave in Indah Kapuk Beach used SBE26, in East Lampung used SBE26 and RBRDUO TD. Parameters were the structure of mangrove vegetation and wave energy reduction. The wave observed in Indah Kapuk Beach tends to be smaller than in East Lampung, so the influence of respiratory root in reducing wave in Indah Kapuk Beach was less visible while the influence of respiratory root in East Lampung was more clearly seen. The muffled wave in the Indah Kapuk Beach research was less visible due to the presence of inhibitors obstructing the incoming waves, while the reduced wave was more clearly measured in the study in East Lampung because without an inhibitors of wave coming.

No abstract

Air kebutuhan makhluk hidup yang utama dalam kehidupan sehari-hari. Pemantauan kualitas air perlu dilakukan pada air sungai, air laut, air danau, air rawa  dan air tanah sehingga air dapat dimanfaatkan sesuai dengan kegunaannya. Kajian  ini bertujuan untuk menganalisa penggunaan  metode perhitungan indeks kualitas air dalam menentukan status kualitas air permukaan sehingga diketahui metode yang paling efektif, sensistif dan obyektif. Metode perhitungan Indeks Kualitas Air (IKA) diperlukan untuk menyederhanakan banyaknya nilai dari berbagai jenis parameter menjadi sebuah angka tunggal yang mampu mendeskripsikan kondisi kualitas air, sehingga lebih mudah dipahami oleh masyarakat.  Ada beberapa metode perhitungan IKA di berbagai Negara, metode Storet, IP, dan CCME WQI (Canadian Council of Ministers of The Environment).  Metode tersebut akan dibandingkan dengan beberapa indikator. Hasil kajian menunjukkan Metode IP lebih unggul jika memakai data tunggal, karena memiliki kelebihan dari segi biaya dan waktu namun hanya mempresentasikan status mutu air pada saat itu saja tidak dalam periode tertentu. Metode Storet dan CCME menggunakan data perulangan sepanjang waktu (time series data), sehingga lebih menggambarkan status mutu air dalam periode tertentu. CCME WQI lebih unggul dari Metode Storet dan Metode IP karena memperhitungkan besarnya selisih hasil pengujian yang melebihi baku mutu melalui F3 (Amplitude). Dari kajian di atas disimpulkan, Metode CCME merupakan metode yang paling tepat untuk menganalisis kualitas air di berbagai negara termasuk Indonesia baik pada air permukaan maupun air tanah dengan tingkat efektivitas dan sensitivitas yang lebih tinggi dibandingkan dengan metode lainnya serta penggunaan jumlah dan jenis parameter yang fleksibel. Kata kunci : Kualitas Air, Indeks Kualitas Air, Air Permukaan