RIVER REHABILITATION of SG. MUDA, KEDAH Contents
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RIVER REHABILITATION OF SG. MUDA, KEDAH Contents • Objectives • Scope of Work • Sg. Muda Recent Floods • Hydrological Modelling • River Modelling Objectives • Ensure that design cross-sections and alignment of the main river channel are economic, effective and environmentally sound; • Propose alternative designs for identified locations to meet the above requirements; • Examine the long term river behaviour through model studies, to minimise expensive repair works in future resulting from the new alignment. Scope of Work (a) Rainfall data in space and time leading to chosen flood events. (b) Runoff discharge and stage records of the chosen events; (c) Computer simulation of the flood events; (d) Computer simulation of long term river behaviour to determine stretches prone to meandering, hence needing extra protection; (e) Changes in alluvial river geometry in terms of aggradation and degradation as well as lateral channel migration as a result of the flood events; (f) Design criteria used for the Flood Control Remediation Plan; (g) Specific design of the proposed structures including levee protection, riverbank protection works and protection of bridge crossings and other structures. SITE VISITS Site Visit Site Visit Sg. Muda River Mouth Site Visit New Bridge At Sg. Muda Near Kota Kuala Muda Site Visit Construction of New Sg. Muda Barrage Site Visit New Sg. Muda Barrage Site Visit Houses Extended into River Reserve Site Visit Flood Plain (Padi Field) along Muda River Near Rantau Panjang Site Visit Phase II Flood Mitigation Project at Muda River (Pekula Pumping Station) Site Visit Abandoned Recreational Park at Pekula Pumping Station Site Visit Construction Works at Pekula Pumping Station Site Visit Irrigation Canals at Pekula Pumping Station (25th May 2005) Site Visit Sand Mining Activities Site Visit Sg. Muda @ CH 12400 Sg. Muda Recent Floods Study Area October 1998 Flood Flood Prone Areas (Oct 1998 Flood) Summary of Rainfall Distribution for 2003 Flood No Rainfall Total Total Rainfall ARI (3 day District 2/10 3/10 4/10 5/10 . Station (2-5 Oct) (3 Day Max) Max) 1 Pulai Baling 20 27 80 46 173 153 Normal Kuala 2 Baling 43 56 120 27 246 219 5 Pegang Jam. Syed Kuala 3 32 79 148 57 316 284 30 Omar Muda Gunung Kuala 4 147 238 252 128 765 637 >100 Jerai Muda Kuala 5 Sg. Petani 47 124 177 68 416 369 >100 Muda 6 Pendang Kota Setar 34 72 41 15 162 147 Normal 7 Alor Setar Kota Setar 33 60 33 26 151 125 Normal 8 Sik Sik 96 80 220 85 480 396 >100 9 Jeniang Sik 71 90 115 96 372 301 50 10 Kulim Kulim 12 74 242 77 403 392 >100 Gunung Jerai 525 mm Sg. Muda @ Syed Omar Flood Ranking No. Year Q (m3/s) No. Year Q (m3/s) No. Year Q (m3/s) 1 1988 948 11 1976 542 21 1994 287 2 1997 928 12 2000 508 22 1975 279 3 1998 854 13 1990 464 23 2002 267 4 2003 843 14 1983 370 24 1978 265 5 1986 838 15 2005 368 25 1974 251 6 1999 833 16 1993 349 26 1989 223 7 1985 737 17 1996 348 27 1979 196 8 1987 650 18 1982 341 28 1981 176 9 1980 629 19 2001 321 29 1977 137 10 1984 623 20 2004 314 Sg. Muda @ Ladang Victoria No. Year Q (m3/s) No. Year Q (m3/s) No. Year Q (m3/s) 1 2003 1340 17 1968 572 33 1983 393 2 1988 1225 18 1975 565 34 1991 382 3 1996 1070 19 2005 565 35 1987 377 4 1998 980 20 1976 549 36 1978 375 5 1967 912 21 1969 546 37 1961 374 6 1965 861 22 1977 542 38 2004 340 7 1973 780 23 2001 539 39 1989 332 8 1972 706 24 1971 535 40 1993 326 9 1966 661 25 1963 516 41 1992 319 10 1999 651 26 1984 500 42 1986 315 11 1964 640 27 1980 480 43 1962 268 12 1997 626 28 1979 450 44 1974 264 13 2000 626 29 1985 449 45 14 2002 612 30 1981 436 46 15 1970 602 31 1990 433 16 1960 572 32 1982 399 Flood Frequency Analyses for Sg. Muda @ Syed Omar Return Period Discharge (m3/s) DID Gumbel External Type I (Discharge Data from 1974 – 2005) 2 497 444 5 784 678 10 987 832 25 1255 1028 50 1461 1173 100 1671 1317 200 1887 1460 Notes: 1988 Flood – 948 m3/s (10-yr ARI) 1998 Flood – 850 m3/s (10-yr ARI) 2003 Flood – 831 m3/s (10-yr ARI) Flood Frequency Analyses for Sg. Muda @ Ladang Victoria Return Period Discharge (m3/s) DID JICA (1995) Gumbel External Type I (Discharge Data from 1960 – 2005) 2 517 536 5 760 810 742 10 916 950 880 25 1125 1053 50 1275 1260 1182 100 1423 1340 1309 200 1572 1436 Notes: 1988 Flood – 1225 m3/s (50-100 yr ARI) 1998 Flood – 980 m3/s (25-yr ARI) 2003 Flood – 1340 m3/s (100-yr ARI) 2003 Hydrograph @ Jbt Syed Omar 1000 900 Q = 831m3/s 800 700 /s) 3 600 500 400 Discharge, Q(m 300 200 100 0 0 1000 2000 3000 4000 5000 6000 7000 8000 Hour Jan Feb Mac Apr May Jun Jul Aug Sep Oct Nov Dec 2003 Hydrograph @ Ldg Victoria 1400 1300 Q = 1340m3/s 1200 1100 1000 900 /s) 3 800 700 600 Discharge, Q(m Discharge, 500 400 300 200 100 0 0 1000 2000 3000 4000 5000 6000 7000 8000 Hour Jan Feb Mac Apr May Jun Jul Aug Sep Oct Nov Dec Hydrological Modelling Hydrological Modeling Design Flood Hydrograph of 5, 20, 50 and 100 yr ARI for Sg Muda at Ladang Victoria (JICA, 1995) Design Flood Hydrograph of 5, 20, 50 and 100 yr ARI for Sg Muda at Ladang Victoria (Zaaba, 2002) HEC-HMS • DISCHARGE STATION: – Jambatan Syed Omar (5606410) – Ladang Victoria (5505412) • RAINFALL STATION: – Bt. 27 Jln. Baling (5507076) – Bt. 61 Jln. Baling (5808001) – Jeniang Klinik (5806066) – Komplek Rumah Muda (6108001) • MODEL SET UP – CALIBRATION –OCTOBER 2003 – VALIDATION – NOVEMBER 1998 METHODOLOGY • Catchment Routing: – Losses : Exponential – Transform : Clark Unit Hydrograph – Baseflow : Constant Monthly • Channel Routing: – Kinematic Wave • Rainfall Average: – Thiessen Polygon Method RAINFALL & DISCHARGE STATION LOCATIONS N STUDY AREA KEDAH PULAU PINANG TERENGGANU KELANTAN PERAK PAHANG SELANOGOR S MUDA . KUALA M LUMPUR NEGERI DAM U D SEMBILAN A MELAKA JOHOR NAMI A BERIS DAM D U .M S REMAN DAM JENIANG BARRAGE 5806414 SIK S . K E T I L A D U M . S BALING SUNGAI PETANI 5608418 L I T 5606410 E K . S S . K KUALA U P KETIL A N MUDA G BARRAGE 5505412 S . S I D A M SCALE RAINFALL GAGE WEIGHT Area Weighted Rainfall Stations Catchment (sq.km) 6108001 5808001 5806066 5507076 Nami 1661 0.61 0.27 0.12 - Sik-Ketil 1718 - 0.34 0.25 0.41 Sidam 616 - - - 1.00 Sg.Muda DS 215 - - 0.07 0.93 HEC-HMS MODEL LAYOUT OUTPUT HYDROGRAPH CALIBRATION RESULTS (2003 Flood) VALIDATION RESULTS (1998 Flood) JAMBATAN SYED OMAR (a) Calibration (b) Validation LADANG VICTORIA (a) Calibration (b) Validation RIVER MOUTH (a) Calibration (b) Validation DESIGN RAINFALL • Design rainfall for 50-year and 100-year, 72-hours duration are acquired from the JPZ design rainfall, which has been derived from the isohyetal map • The temporal rainfall pattern distribution has been created in accordance with the HP-1 for duration 72-hours. 50-y, 3-d, DESIGN RAINFALL REFERENCE POINT 5806414 (JENIANG G.S) 50-y, 3-d, DESIGN RAINFALL (JENIANG G.S) 35 12 0 30 10 0 25 80 20 60 15 40 (mm) Rainfall 10 20 5 0 123456 0 1 6 11 16 21 26 31 36 41 46 51 56 61 66 71 Time (h) Time (h) Design Rainfall at Jeniang G.S (ref.point) REFERENCE POINT 5606410 (JSO G.S) 50-y, 3-d, DESIGN RAINFALL (J.S.OMAR G.S) 40 12 0 35 10 0 30 80 25 20 60 15 40 Rainfall (mm) 10 20 5 0 0 123456 1 6 11 16 21 26 31 36 41 46 51 56 61 66 71 Time (h) Time (h) Design Rainfall at Jambatan Syed Omar G.S (ref.point) 50-y, 3-d, DESIGN RAINFALL REFERENCE POINT 5505412 (LV G.S) 50-y, 3-d, DESIGN RAINFALL (LDG.VICTORIA G.S) 45 150 40 35 100 30 25 20 50 15 Rainfall (mm) Rainfall Rainfall (mm) 10 0 5 123456 0 1 6 11 16 21 26 31 36 41 46 51 56 61 66 71 Time (h) Time (h) Design Rainfall at Ladang Victoria G.S (ref.point) OUT L ET ( RIV ER M OUT H) 50-y, 3-d, DESIGN RAINFALL (RIVER MOUTH) 50 45 150 40 35 100 30 25 50 20 Rainfall (mm)Rainfall 15 Rainfall (mm) 0 10 5 123456 0 Time (h) 1 6 11 16 21 26 31 36 41 46 51 56 61 66 71 Time (h) Design Rainfall at Outlet 100-y, 3-d, DESIGN RAINFALL 100-y, 3-d, DESIGN RAINFALL (JENIANG G.S) REFERENCE POINT 5806414 (JENIANG G.S) 40 12 0 . 0 0 35 10 0 . 0 0 30 80.00 25 20 60.00 15 40.00 (mm) Rainfall 10 20.00 5 0.00 0 123456 1 6 11 16 21 26 31 36 41 46 51 56 61 66 71 Time (h) Time (h) Design Rainfall at Ladang Victoria G.S (ref.point) REFERENCE POINT 5606410 (JSO G.S) 100-y, 3-d, DESIGN RAINFALL (J.S.OMAR G.S) 45 14 0 .