A Comparison on rain water harvesting potentials in different Institutes of Chittagong City.

In Bangladesh, surface water was the principal source for drinking water ever up to the recent past. However, during the recent decades, due to the intensive development programs, the ground water is utilized for drinking purposes in most rural areas. Unfortunately, recent investigations have demonstrated almost countrywide occurrence of high arsenic levels in the tube well water. In the present context, rainwater harvesting is being seriously considered as an alternative option for water supply in Bangladesh.

The objective of the research is to study the potential of the rainwater harvesting system of Chittagong city. The main emphasis is given on the rainwater harvesting as a source of drinking water and other domestic use. The research includes a literature review on rainfall data of Bangladesh to fulfill the water demand of different institutes of Chittagong. We surveyed four different institutions of Chittagong (i.e. Port City International University, East Delta University, Chittagong Polytechnic Institute, National Polytechnic College) and collected different in physical features, such as gross rooftop area, the total number of students and employees. Moreover, water samples were collected from rooftops from these institutions and tested according to the Bangladeshi regulation to analyze the quality of water. Finally, all aspects were analyzed to determine whether this could be a solution worth implementing in Chittagong to alleviate water scarcity problems as well as the possible positive impacts on the economy, society and the environment.

Transcript

1. A Comparison on rain water harvesting potentials in different institutes of chittagong city Department of Civil Engineering Port City International University, Chittagong. Thesis Presentation for the Degree of Bachelor of Science 06th August 2016 By Sanatan Chakrabarty Avijit Krishna Sushil MD.Saifuddin Debashis Deb Supervisor: S.M.Rahat Rahaman, Lecturer Badrul Munir Hanafi , Lecturer
2. Presentation Outline • Survey Method • Data Collection • Water quality parameters • Result and Discussion
3. Survey Method • Initial Survey » Site Supervision • Detailed Survey » Area Calculation » Other Data Collection
4. 3D Map of Chittagong Figure: 3D map of Chittagong City
5. Study Area Figure: Location Map of Study Area * From google map
6. Study Area
7. Study Area Name of the Survey Institutes Port City International University, 7 - 14, Nikunja Housing Society, South Khulshi, South Khulshi Road, Chittagong East Delta University, 1267/A, Goshaildanga, Sheikh Mujib Road, Chittagong Chittagong Polytechnic Institute, Nasirabad, Chittagong National Polytechnic College.Chittagong
8. PORT CITY INTERNATIONAL UNIVERSITY 34' 131' 41' 169' 38' RO O F AREA M ESUREM ENT R O O F A R EA = 12675 SFT 75'
9. EAST DELTA UNIVERSITY 196' 96' 96' 50'-2" 50'-2" 96' 51' 51'-2" ROOF AREA MESUREMENT ROOF AREA = 14400 SFT
10. Roof Area Water Collection Calculation v PORT CITY INTERNATIONAL UNIVERSITY Rainfall Harvest = 12675 sft = 26508 litre (For 1 inch rainfall) Population = 6695 person Water Demand = 6695 pereson X 15 gpcd or 56.25 litre = 376594 litre v EAST DELTA UNIVERSITY Rainfall Harvest = 14400 sft = 30116 litre (For 1 inch rainfall) Population = 4500 person Water Demand = 4500 pereson X 15 gpcd or 56.25 litre = 253125 litre
11. CHITTAGONG POLYTECHNIC INSTITUTE 1 4 7 ' 60' 5 6 1 ' 60'-2" 60' 1 4 7 ' 1 4 7 ' 6 0 ' 1 4 7 ' 60' R O O F A R E A M E S U R E M E N T R O O F A R E A = 4 4 5 5 0 S F T 6 0 '
12. NATIONAL POLYTECHNIC INSTITUTE 8 0 ' 71' 121' 3 5 ' 50' 4 5 ' R O O F A R E A M E S U R E M E N T R O O F A R E A = 1 2 3 7 5 S F T
13. Roof Area Water Collection Calculation v CHITTAGONG POLYTECHNIC INSTITUTE Rainfall Harvest = 44550 sft = 93171 litre (For 1 inch rainfall) Population = 10850 person Water Demand = 10850 pereson X 15 gpcd or 56.25 litre = 610313 litre v NATIONAL POLYTECHNIC INSTITUTE Rainfall Harvest = 12375 sft = 25881 litre (For 1 inch rainfall) Population = 1095 person Water Demand = 1095 pereson X 15 gpcd or 56.25 litre = 61594 litre
14. Comparison of Population 0 2000 4000 6000 8000 10000 12000 PCIU EDU CPI NPI Population Fig: Comparison of Population Chart *Calculated as per person
15. Comparison of Rainfall Harvest & Water Demand Chart 0 100000 200000 300000 400000 500000 600000 700000 PCIU EDU CPI NPI Rainfall Harvest Figure: Comparison of Rainfall Harvest & Water Demand Chart * litre for each inch rainfall)
16. Survey Method • Data Collection Total Water available from roof Annual rainfall Total catchment area co efficient of runoff for roof Total students & staffs
17. AVERAGE MONTHLY WEATHER IN CHITTAGONG, BANGLADESH Here are some annual weather facts we collected from our historical weather data: • On average, the temperatures are always high. • A lot of rain (rainy season) falls in the months: April, May, June, July, August, September and October • Chittagong has dry periods in January and December. • On average, the warmest month is April. • On average, the coolest month is January. • July is the wettest month. • January is the driest month. * Data from nearest weather station: Chittagong, Bangladesh.
18. AVERAGE MINIMUM AND MAXIMUM TEMPERATURE OVER THE YEAR Average min and max temperatures in Chittagong, Bangladesh * The monthly mean minimum and maximum daily temperature. Show in Fahrenheit.
19. AVERAGE MONTHLY PRECIPITATION OVER THE YEAR (RAINFALL, SNOW) Average precipitation (rain/snow) in in Chittagong, Bangladesh * This is the mean monthly precipitation, including rain, snow, hail etc. Show in Inches
20. AVERAGE MONTHLY RAINY DAYS OVER THE YEAR Average rainy days (rain/snow) in Chittagong, Bangladesh * This is the number of days each month with rain, snow, hail etc.
21. AVERAGE HUMIDITY OVER THE YEAR Average relative humidity in Chittagong, Bangladesh
22. AVERAGE WIND SPEED OVER THE YEAR Average wind speed in Chittagong, Bangladesh * Monthly wind speed in (meters per second)
23. Climate graph of Chittagong
24. Water quality parameters q T.S , T.D.S, T.S.S q PH Test q Co2 Test q Alkalinity Test q Choloride Test q BOD Test q q COD Test
25. T.S , T.D.S, T.S.S Test Procedure
26. LAB Pictures
27. T.S , T.D.S, T.S.S 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 Sample 1 Sample 2 Sample 3 Sample 4 T.S.S T.D.S T.S Figure: Chart for T.S , T.D.S, T.S.S * All data in mg/l
28. PH Test Procedure
29. LAB Pictures
30. PH Test 6.35 6.4 6.45 6.5 6.55 6.6 6.65 6.7 6.75 6.8 6.85 Sample 1 Sample 2 Sample 3 Sample 4 Column3 Figure : Chart Of PH Test
31. Co2 Test Procedure
32. LAB Pictures
33. Co2 Test 0 2 4 6 8 10 12 14 16 18 Sample 1 Sample 2 Sample 3 Sample 4 Column3 * All data in (NaOH) ml Figure : Chart Of Co2 Test
35. LAB Pictures
36. Alkalinity Test 0 2 4 6 8 10 12 14 16 18 Sample 1 Sample 2 Sample 3 Sample 4 Column2 * All data in (H2SO4) ml Figure : Chart Of Alkalinity Test
38. LAB Pictures
39. Choloride Test Figure : Chart Of Choloride Test * All data in (AgNO3) ml 0 20 40 60 80 100 120 140 Sample 1 Sample 2 Sample 3 Sample 4
41. LAB Pictures
42. BOD Test 0 0.5 1 1.5 2 2.5 3 3.5 4 Category 1 Category 2 Category 3 Category 4 DOi DOf * All data in (Sodium Thio Sulphate) ml Figure : Chart Of BOD Test
44. LAB Pictures
45. 0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5 Sample 1 Sample 2 Sample 3 Sample 4 Sample * All data in mg/l Figure :
47. LAB Pictures
48. COD Test 0 0.5 1 1.5 2 2.5 3 Sample 1 Sample 2 Sample 3 Sample 4 Column1 Series 1 * All data in ml Figure : Chart Of COD Test
49. Water quality parameters Result Name of Parameters Sample 1 Sample 2 Sample 3 Sample 4 T.S 0.2 mg/l 0.1 mg/l 0.1 mg/l 0.3 mg/l T.D.S 0.1 mg/l 0.1 mg/l 0.1 mg/l 0.1 mg/l T.S.S 0.1 mg/l 0.0 mg/l 0.0 mg/l 0.2 mg/l PH Test 6.5 6.7 6.6 6.8 Co2 Test (NaOH) 8.25 ml 16.00 ml 12.50 ml 7.50 ml Alkalinity Test (H2 SO4 ) 13 ml 15 ml 12 ml 16 ml Choloride Test (AgNO3) 85.95 ml 89.53 ml 69.84 ml 119.98 ml BOD Test (Sodium thio Sulphate) 3.8 ml 1.2 ml 1.8 ml 0.8 ml 3.0 ml 0.8 ml 2.6 ml 1.6 ml 5.85 mg/l 2.25 mg/l 4.95 mg/l 2.25 mg/l COD Test 1.9 ml 2.5 ml 2.3 ml 2.7 ml
50. Result and Discussion The main objectives of the study are: • We determine the rainwater quality in Chittagong city region and compare this with drinking water standard. • We determine the efficiency and reliability of a rainwater harvesting system as a source of water in Chittagong region. • By doing all those test and research work we can tell that those four institutions can use collected rain water from there roof for gardening, vehicle washing and flushing in toilets.
51. Thank you!!!!! ANY QUERY !!!