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Kota Semarang dikenal sebagai kota yang sering mengalami banjir. Pembangunan Waduk Jatibarang merupakan salah satu cara untuk mengatasi permasalahan banjir di kota Semarang. Tata guna lahan adalah sebuah pemanfaatan lahan dan penataan lahan yang dilakukan sesuai dengan kondisi eksisting alam. Kegiatan manusia dan penggunaan kawasan yang tidak terkendali memberikan pengaruh negatif yang berpotensi menyumbang limbah rumah tangga dan mempengaruhi tingkat kesuburan perairan Waduk Jatibarang. Tujuan penelitian ini adalah untuk mengidentifikasi tata guna lahan bagian hulu di sekitar Waduk Jatibarang dan mengetahui tingkat kesuburan perairan Waduk Jatibarang. Metode yang digunakan adalah metode survey. Penelitian dilaksanakan pada tanggal 15 - 27 September 2017. Penelitian ini dilakukan pada 6 titik sampling di Waduk Jatibarang. Hasil penelitian menunjukkan bahwa lahan bagian hulu Waduk Jatibarang terdiri dari 50 % vegetasi, 20% pemukiman, 25% persawahan,dan 5% tegalan. Karakter fisika dan kimia perairan Waduk Jatibarang tergolong baik. Kandungan DO antara 4,80 – 6,96 mg/l, kandungan nitrat antara 0,64 – 1,10 ppm, total fosfat antara 0,13 – 0,26 ppm, dan klorofil-a antara 2,72 – 4,29 ppm. Indeks TSI Carlson berkisar antara 52,57 – 55,36 menunjukkan status kesuburan perairan eutrofik ringan. Semarang City is known as flooded city. Construction of Jatibarang Reservoir is a solution to solve the flood problem in Semarang city. Land use is a utilization land and land arrangement in accordance of the nature existantion condition. Human activities nearby the waters can lead to the entry of various substances into the aquatic system. Uncontrolled use of the area has a negative effect that potentially contributes to household waste and affect the water thropic level. The purpose of this study is to identify the upstream of land use in Jatibarang Reservoir and to know Water Thropic State at Jatibarang Reservoir. Research reference is using survey method. The research was conducted on 15 – 27 September 2017. This research was conducted on six sampling points, the scope of land studied by upstream area in Jatibarang Reservoir with percentage of 50% vegetation, 20% settlement, 25% rice field, and 5% moor. Physical and chemical character of Waters of Jatibarang Reservoir are good. DO content between 4,80 - 6,96 mg / l, nitrate content between 0,64 - 1,10 ppm, total phosphate between 0,1305 - 0,2695 ppm , and chlorophyll-a between 2,72 – 4,29 ppm. The Carlson TSI index ranged from 52,57 to 55,93 indicates the mild eutrophic water thropic state.
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