Water Resource Management - Flood Control.pptx

describing the water resource planning particularly flood control

1. FLOOD CONTROL

2. Flood control and hydropower regulation of rivers ultimately reduces the amount of parafluvial zone and results in both a loss in the production of new gravel surfaces and a loss of the dynamics that sustain the shifting habitat mosaic (Stanford et al., 1996); From: Methods in Stream Ecology, Volume 1 (Third Edition), 2017

3. The Philippines lies in the path of tropical cyclones. An annual average of twenty tropical cyclones enter the Philippine Area of Responsibility and out of this, seven to eight directly hit the country causing enormous water-related damages to human lives and properties. According to the reports of the Office of Civil Defense, approximately 1,000 people every year are killed and/or missing due to floods brought about by cyclones.

4. Among the mandate of the Department of Public Works and Highways, DPWH, as the engineering arm of the government, is to plan, construct and maintain flood control facilities on major or principal river basins to mitigate the hazards and damages of flood disasters. Generally, flood control projects, which constitute about 10-15% of the total DPWH budget, are classified into the following:

5. MAIN PREPARATION FOR FLOOD CONTROL PLANNING

6. Computations of runoff discharge and non-uniform flow analysis HYDROLOGIC MODELLING SYSTEM (HEC-HMS) RUN OFF ANALYSIS SYSTEM (HEC-RAS)

7. 1. HEC-HAS

8. 2. HEC-RAS

9. SURVEY & INVESTIGATION

10. SURVEY & INVESTIGATION

11. SURVEY & INVESTIGATION

12. SURVEY & INVESTIGATION

13. IDENTIFICATION OF TARGET RIVER BASIN

14. IDENTIFICATION OF TARGET RIVER BASIN

15. IDENTIFICATION OF TARGET RIVER BASIN

16. IDENTIFICATION OF TARGET RIVER BASIN

17. DESIGN DISCHARGE

18. DESIGN DISCHARGE

19. Procedure on design discharge

20. DESIGN DISCHARGE - RAINFALL ANAYSIS

21. DESIGN DISCHARGE - RAINFALL ANAYSIS

22. DESIGN DISCHARGE - RAINFALL ANAYSIS

23. DESIGN DISCHARGE - RAINFALL ANAYSIS

24. ECONOMIC ANAYSIS

25. EVALUATION OF FLOOD CONTROL PROJECT Project Benefit Flood Damages Bank Erosion Damages Economic Cost Life span of the Project

26. EVALUATION OF FLOOD CONTROL PROJECT

27. EVALUATION OF FLOOD CONTROL PROJECT

28. EVALUATION OF FLOOD CONTROL PROJECT

29. Water quality control & management

30. Philippine water quality is assessed based on the set beneficial use as defined in the DENR Administrative Order (DAO) 34, Series of 1990. Under this DAO, there are 33 parameters that define the desired water quality per water body classification. Accordingly, a water body must meet all the criteria of each applicable parameter 100 percent of the time to maintain its designated classification

31. In the absence of a water quality index, an interim methodology based on compliance to DAO 90-34 water quality criteria is used for all surface waters. Parameters monitored include: (a) dissolved oxygen (DO), biochemical oxygen demand (BOD), total suspended solids (TSS), total dissolved solids (TDS), and heavy metals for inland surface waters; (b) fecal coliform, nitrates, and salinity (chloride content) for groundwater as defined in the Philippine National Standards for Drinking Water; (c) DO, coliform, and heavy metals for coastal and marine waters; and (d) biological parameters such as phytoplankton, zooplankton, and benthos were monitored in selected water bodies.

32. Guidelines on water quality

33. Guidelines on water quality

34. Significant Efflent

35. According to DAO 34 series of 1990 or the revised water usage and classifications, water bodies are classified into nine (9) classes as follows: