DAFTAR ISI

LEMBAR PENGESAHAN..............................................................................................i

ABSTRAK.......................................................................................................................ii

KATA PENGANTAR....................................................................................................iii

DAFTAR ISI...................................................................................................................iv

DAFTAR GAMBAR......................................................................................................vi

DAFTAR TABEL..........................................................................................................vii

BAB I.......................................................................................................................1

PENDAHULUAN...................................................................................................1

1.1 Latar Belakang.........................................................................................1

1.2 Tujuan......................................................................................................1

1.3 Ruang Lingkup.........................................................................................1

1.4 Lokasi Studi.............................................................................................1

1.5 Sistematika Penulisan..............................................................................1

BAB II......................................................................................................................3

ANALISIS DATA...................................................................................................3

2.1 Data Hidrologi dan Hidrometri................................................................3

2.1.1 Data Hidrologi..............................................................................................3

2.1.2 Data Hidrometri...........................................................................................4

2.2 Analisis Hidrologi....................................................................................6

2.2.1 Hujan Rata- Rata untuk Suatu Daerah.........................................................6

2.2.1.1 Metode Aritmatik........................................................................6

2.2.1.2 Metode Thiessen.........................................................................7

2.2.1.3 Perhitungan Error Aritmatika dan Thiessen...............................7

2.2.2 Penentuan Curah Hujan Maksimum (Hujan Rencana)................................9

2.2.2.1 Metode Thiessen.......................................................................10

2.2.2.2 Metode Gumbell.......................................................................11

2.2.2.3 Metode Log Pearson III............................................................11

2.2.2.4 Perbandingan Metode Analisis.................................................11

2.3 Penentuan Curah Hujan Rencana...........................................................13

2.4 Perhitungan Debit Banjir Rencana.........................................................27

2.4.1 Perhitungan Hidrograf Satuan Sintesis........................................................9

2.4.2 Perhitungan Hidrograf Berdasarkan Curah Hujan Rencana........................9

BAB III..................................................................................................................28

PERENCANAAN DAN PERHITUNGAN KONSTRUKSI BENDUNG............28

3.1 Data Perencanaan...................................................................................28

3.1.1 Data Topografi...........................................................................................28

3.1.2 Data Tanah.................................................................................................28

3.2 Perhitungan Perencanaan Hidrolis.........................................................29

3.2.1 Tinggi Mercu Bendung..............................................................................29

3.2.2 Tinggi Bendung..........................................................................................30

3.2.3 Lebar Bendung...........................................................................................30

3.2.4 Lebar Pintu Penguras (Pintu Pembilas).....................................................31

3.2.5 Tebal Pilar..................................................................................................31

3.2.6 Lebar Efektif Bendung...............................................................................31

3.2.7 Perhitungan Saluran Pengambilan.............................................................34

3.2.7.1 Perhitungan Dimensi Saluran Pengambilan……………………113.2.7.2 Perhitungan Pintu Pengambilan…………………………….. 11

3.2.8 Menentukan Muka Air Maksimum Sungai di Hilir Bendung....................36

3.2.9 Menentukan Muka Air Maksimum di Atas (Hulu) Bendung....................34

3.3 Perencanaan Dimensi Kolam Olakan....................................................36

3.4 Menentukan Panjang Lantai Muka........................................................38

BAB IV..................................................................................................................41

PERENCANAAN STABILITAS BENDUNG.....................................................41

4.1 Gaya Berat Tubuh Bendung...................................................................41

4.2 Gaya Gempa...........................................................................................42

4.3 Gaya Hidrostatis.....................................................................................42

4.4 Gaya Angkat (Uplift Force)...................................................................44

4.5 Resume Perhitungan Stabilitas Bendung...............................................48

4.6 Perhitungan Kontrol Stabilitas...............................................................48

4.6.1 Keadaan Debit Air Normal........................................................................49

4.6.2 Keadaan Debit Banjir.................................................................................50

BAB V....................................................................................................................53

KESIMPULAN DAN SARAN..............................................................................53

5.1. Hasil Perhitungan...................................................................................53

5.2. Kesimpulan............................................................................................53

5.3. Saran.......................................................................................................54

DAFTAR GAMBAR

Gambar 1.1 Peta Lokasi...........................................................................................2Gambar 1.2 Peta Jaringan Irigasi.............................................................................7Gambar 1.3 Luas DAS Ciwado..............................................................................20Gambar 2.1 Poligon Thiessen................................................................................21Gambar 2.2 Parameter DAS Sungai Ciwado.........................................................26Gambar 3.1 Grafik Koefisien C0...........................................................................26Gambar 3.2 Grafik Koefisien C1...........................................................................27Gambar 3.3 Grafik Koefisien C2...........................................................................32Gambar 3.4 Penampang Saluran............................................................................33Gambar 3.5 Pintu Pengambilan.............................................................................33Gambar 3.6 Panjang Kolam Olak Rencana...........................................................34Gambar 4.1 Data Hasil Massprop Autocad...........................................................37Gambar 4.2 Gaya Hidrostatis pada Kondisi Muka Air Banjir...............................41Gambar 4.3 Gaya Hidrostatis pada Kondisi Muka Air Normal.............................43Gambar 4.4 Data Hasil Massprop Air di Atas Bendung........................................43

DAFTAR GRAFIK

Grafik 2.1 HSS Durasi 1 Jam dan Kedalaman Run-Off 1 cm S.CiwadoGrafik 2.2 HSS DAS Sungai CiwadoGrafik 2.3 Hidrograf Curah Hujan Rencana Periode 100 Tahun

DAFTAR TABELTabel 2.1 Data Curah Hujan Lengkap di Stasiun Mundu........................................3

Tabel 2.2 Data Curah Hujan Lengkap di Stasiun Losari.........................................4

Tabel 2.3 Data Curah Hujan Lengkap di Stasiun Ciawigebang..............................4

Tabel 2.4 Data Temperatur Udara Bulanan di Stasiun Adi Sucipto........................5

Tabel 2.5 Data Penyinaran Matahari Bulanan di Stasiun Adi Sucipto....................5

Tabel 2.6 Data Kelembapan Udara Bulanan di Stasiun Adi Sucipto.......................5

Tabel 2.7 Data Kecepatan Angin Bulanan di Stasiun Adi Sucipto..........................6

Tabel 2.8 Curah Hujan Maksimum R24 (mm/hari).................................................7

Tabel 2.9 Propertis dari Ketiga Stasiun Curah Hujan..............................................8

Tabel 2.10 Rata-Rata Curah Hujan Maks R24 dan Perhitungan Error....................9

Tabel 2.11 Perhitungan Peringkat-Peringkat Periode Ulang...................................9

Tabel 2.12 Perhitungan Curah Hujan Harian Maksimum Metode Gumbell.........10

Tabel 2.13 Perhiungan Curah Hujan Harian Maksimum Metode Log Pearson III11

Tabel 2.14 Perhitungan Error.................................................................................15

Tabel 2.15 Curah Hujan Rencana dengan Periode Ulang Tertentu.......................15

Tabel 2.16 Perhitungan Slope................................................................................15

Tabel 2.17 Perhitungan HSS dengan Metode Snyder............................................16

Tabel 2.18 Data Absis dan Ordinat HSS S.Ciwado...............................................16

Tabel 2.19 Perhitungan Presipitasi Efektif (Pef)...................................................17

Tabel 2.20 Persamaan Garis HSS Sungai Ciwado.................................................19

Tabel 2.21 QUH dalam Durasi Waktu Tertentu....................................................19

Tabel 2.22 Perhitungan Hidrograf berdasarkan Hujan Rencana 100 Tahun.........20

Tabel 3.1 Data Tanah.............................................................................................22

Tabel 3.2 Elevasi Mercu Bendung.........................................................................23

Tabel 3.3 Tinggi Bendung.....................................................................................24

Tabel 3.4 Lebar Bendung.......................................................................................25

Tabel 3.5 Lebar Pintu Penguras.............................................................................33

Tabel 3.6 Koefisien Bazin......................................................................................35

Tabel 3.7 Perhitungan Elevasi di Hilir Bendung...................................................36

Tabel 3.8 Weighted Creep Ratio............................................................................38

Tabel 3.9 Perhitungan Rembesan...........................................................................39

Tabel 4.1 Perhitungan Momen Akibat Berat Bendung..........................................41

Tabel 4.2 Perhitungan Momen Akibat Gaya Gempa.............................................42

Tabel 4.3 Perhitungan Gaya Hidrostatis Pada Kondisi Air Banjir........................43

Tabel 4.4 Perhitungan Gaya Hidrostatis Pada Kondisi Air Banjir........................43

Tabel 4.5 Perhitungan Gaya Uplift Kondisi Air Banjir.........................................44

Tabel 4.6 Perhitungan Gaya Uplift Kondisi Air Normal.......................................47

Tabel 4.7 Resume Gaya-Gaya yang Bekerja pada Kondisi Air Banjir..................48

Tabel 4.8 Resume Gaya-Gaya yang Bekerja pada Kondisi Air Normal...............51