BIO-ECOLOGICAL DRAINAGE SYSTEM(BIOECODS):CONCEPTS, DESIGN AND CONSTRUCTION

Transcription

1 BIO-ECOLOGICAL DRAINAGE SYSTEM(BIOECODS):CONCEPTS, DESIGN AND CONSTRUCTION

2 BIOECODS Bio-Ecological Drainage System, Malaysia Perimeter Swale Dry Pond Ecological Swale Type C Wetpond

3 INTRODUCTION CONTENTS CONSTRUCTED COMPONENTS DESIGN CONCEPTS DESIGN CRITERIA ECOLOGICAL SWALE MATERIALS CONSTRUCTION EXPERIENCE CONCLUSION

4 INTRODUCTION

5 INTRODUCTION This project has taken various measures to reduce stormwater runoff rates and volumes, and stormwater pollutant load by implementing control at source method. BIOECODS is the first project that uses control at source method in Malaysia and attempts to solve three major problems in Malaysia: Flash Flood River Pollution Water Scarcity

6 RESEARCH DEVELOPMENT Design Construction- Starts: 2000 Completed: 2002 Data Collection Starts: June 2003

7 PROJECT LOCATION USM Engineering Campus is located in District 9 of the Southern Part of Penang.

8 Lebuhra ya Utara- Selatan BIOECODS SITE Catchment Area: 320 acres Ampang Jajar Sungai Krian

9 SITE ORIGINAL CONDITIONS Flat, Low-lying area subject to tidal influence Palm Oil Plantation Estate Peaty and clayey type of soil (min 25 m depth) not an engineered soil Permeability is negligible For construction, average filling of 2 to 3 m of laterite (red clay)

10 DESIGN CONCEPTS

11 SCHEMATIC LAYOUT OF BIOECODS

12 DESIGN CONCEPTS BIO-RETENTION SWALE DRY POND ECOLOGICAL SWALE + SUBSURFACE DETENTION WETPOND DETENTION POND WETLAND/WADING RIVER RECREATIONAL POND RIVER KERIAN

13 DESIGN CRITERIA

14 DESIGN CRITERIA Ecological Swale Design Parameter Longitudinal Slope Manning Roughness Coeficients Design Rainfall Maximum Period of Surface Water Inundation at Surface Swale Criteria 1:1000 Surface Swale=0.035 Sub-Surface Drainage Module= year ARI and Check For 100-Year ARI 24 hours

15 ECOLOGICAL SWALE i) Perimeter Swale a) Cross Section b) Typical View

16 ECOLOGICAL SWALE ii) Type A a) Cross Section b) Typical View

17 ECOLOGICAL SWALE iii) Type B a) Cross Section b) Typical View

18 ECOLOGICAL SWALE iv) Type C a) Cross Section b) Typical View

19 DESIGN CRITERIA DRY POND Design Parameter Maximum period of Surface Water Inundation Maximum depth of water inundation Criteria 24 hours 150 mm

20 DRY POND a) Cross Section b) Typical View

21 DRY POND Dry Pond Swale

22 DRY POND Dry Pond Swale

23 DESIGN CRITERIA WET POND Design Parameter Surface Area Volume Capacity Design Rainfall Criteria 4500 m m 3 10 year ARI

24 WET POND

25 DESIGN CRITERIA DETENTION POND Design Parameter Surface Area Volume Capacity Design Rainfall Criteria 10,000 m 2 18,000m year ARI

26 DETENTION POND

27 DESIGN CRITERIA FOR CONSTRUCTED WETLAND Design Parameter Catchment Area Design Storm( 3 month ARI) Length Width Wetland Surface Area Volume % Catchment Area Design Inflow Rate Mean Residence Time Slope of Wetland Bed Bed Depth Media Hydraulic Conductivity of Gravel Criteria 1.214km mm/hr 155 m 60 m 9,100 m 2 9,100 m m 3 /s 3 days 1% 0.6 m Pea Gravel and Soil Mixture 10-3 m/s to 10-2 m/s

28 WETLAND PLANT SPECIES Type Type 1(0.3 m depth) Type 2(0.3 m depth) Type 3(0.3 m depth) Type 4(0.6 m depth) Type 5(0.6 m depth) Type 6(1.0 m depth) Plant Name Eleocharis Variegata Eleocharis Dulcis Hanguana Malayana Lepironia Articualata Typha Augustifolia Phragmites Karka

29 USM WETLAND PLANT SPECIES Typha Augustifolia Pragmites Karka Typha Augustifolia Hanguana Malayana Lepironia Articulata Eleocharis Dulcis Hanguana Malayana

30 WETLAND

31 WADING RIVER

32 RECREATIONAL POND

33 FINAL DISCHARGE TO RIVER KERIAN

34 ECOLOGICAL SWALE MATERIALS

35 ECOLOGICAL SWALE MATERIALS a) Geostrip b) Module c) Hydronet d) River Sand

36 ECOLOGICAL SWALE MATERIALS e) Topsoil f) Cow Grass

37 ECOLOGICAL SWALE MATERIALS Swale Components Geostrip(parameter Swale Module(Ecological Swale) Hydronet Filter Fabric Clear Sand River Top Soil Grass Specifications Dimension Flow Rate at 1% gradient Compressive Strenght Material Dimension Flow Rate at 1% gradient Compressive Strenght Material Permeability Screening capability Sieve Analysis according to BS 1377 Thickness Species Details 100mmx80mmx 550mm 80 l/min 12 tons/m 2 Recycled polypropylene 405mmx465x607mm 2280 l/min 8 tons/m 2 Recycled Polypropylene 9.30 mm/s 0.38mm Mean Sisze between 0.5mm and 0.2 mm One to two inches Cow Grass

38 CONSTRUCTION EXPERIENCE

39 CONSTRUCTION OF AN ECOLOGICAL SWALE Excavation Module Placement Subsurface Detention Connection between Swale and Subsurface Detention

40 CONSTRUCTION OF AN ECOLOGICAL SWALE Sand Bedding Grass Planting

41 CONCLUDING REMARKS By minimizing the surface runoff at source through the provision of on-site facilities the peak runoff can be reduced at the downstream area Water quality of Standard Class IIB can be achieved if new developments in Malaysia use the concept of Sustainable Urban Drainage System such as the Bio-Ecological Drainage System.

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