Prepared by Musab O. Jayyousi Osama H. Shaheen

1. Modeling and Management of the Stormwater of the Old City of Nablus Nablus – Palestine May 2010 Prepared by Musab O. Jayyousi Osama H. Shaheen Dr. Mohammad N. Almasri

2. INTRODUCTION • Stormwater collection have many impacts on civilization (environmental, economical, social). • Stormwater is of concern for two main issues: • The volume and timing of runoff water (flood control and water supplies) • The potential contaminants that the water is carrying.

3. introduction • This project is concerned with stormwater collection system of the Old City of Nablus.

4. introduction

5. OBJECTIVES • Hydraulically analyze the Old City stormwater collection system • Determine the causes of major problems, critical section and the minimum rainfall intensity where the problem start to show up.

6. Description of the study area • Stormwater collection system is affected by the location of the Old City beneath mount Gerizim and its population. • The inefficiency of the stormwater collection system due to : • Large amount of stormwater • Maintenance and cleaning

7. Description of the study area • Old design • Lack of pubic awareness

8. methodology Data Collection Field Work Data Processing Model Development Evaluation the Results Scenarios

9. Data collection • Collect Maps • Study area and reconnaissance • Dimensions of the stormwater collection system elements

10. Field work • GPS • Taking pictures • Water flow direction • Interview • Determine the missing data

11. Data processing • Identification of water flow direction on maps and determine catchment areas for each catch basin • Determine IDF curves

12. Model development(StormCAD) • StormCAD was used in this study to develop the hydraulic model. • It can provide comprehensive modeling for the design and analysis of storm sewer system. • The general output of the StormCAD presenting the results including (reports, flex tables, profiles, element annotation and color coding)

13. Model development • Define the dimension and the type of the pipes. • Define the catch basin by entering the dimension and its type, then insert elevation of catch basins. • Insert all elements of network on StormCAD software and make it resemble the existing system as close as possible to reality.

14. results • The result of the model represent sections and elements that were expected to have problems, and define its type:

15. results • Pipe overtopping

16. results • Catch basin is flooded

17. scenarios • We suggested some alternative and interpret it into inputs and select the best alternatives.

19. Before and after scenario 3 scenarios Before After

20. Before and after scenario 3 THE EXISTING DESIGN Before After

21. Applying a storm event on scenario 3 • The strongest storm event in 2009-2010 was distributed on 3 days with very high rain intensity.

22. Applying a storm event on scenario 3

23. CONCLUSIONS • The problem that was described starts to show up clearly in some sections of the system at rain intensity of 25 mm/hr, and expands to appear in most parts of the network at rain intensity of 40 mm/hr. • The use of pipelines with diameters of 12 inches is not effective in combined stormwater and sewer collection system. • Time of concentration (tc) and rational coefficients (C) have a significant impact on the drainage of stormwater. • The location of the catch basin affects the efficiency of stormwater collection

24. RECOMMENDATIONS • Exchange the diameter of the pipes the network that was mentioned in Chapter 6 from 12 inches to 20 inches. • Establish a drainage system at the southern entrance “Al-aqaba stairway” and Adjaj stairway "in order to divert stormwater which come from the mountain before entering the Old City. • Make a full maintenance for all network elements, and change the damaged ones, and determine the times of periodic maintenance, especially before winter. • Impose penalties on those dispose of solid wastes in the catch basins in the Old City.

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