WEIR MANAGEMENT AS STRUCTURAL MEASURES FOR FLOOD REDUCTION

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WEIR MANAGEMENT AS STRUCTURAL MEASURES FOR FLOOD REDUCTION. TEAM 5 2010. Contents. I. Introduction What is weir? Weir formulas? II. Approaches Research Based Approach Modelling Based Approach III. Conclusion. Introduction. Weir -

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### WEIR MANAGEMENT AS STRUCTURAL MEASURES FOR FLOOD REDUCTION

TEAM 5 2010

Contents

I. Introduction

What is weir? Weir formulas?

II. Approaches

Research Based Approach

Modelling Based Approach

III. Conclusion

Introduction

Weir -

Small overflow-type dam generally used to increase the level of a river or stream.

Weir Formula (for Mike 11)

I. Villemonte (Villemonte, 1947) formula for sharp crested weirs

Weir Formula

II. Honma formula (we use this)

III. Extended Honma formula

Weir Formulas (for ISIS)

Dry Mode

Q = 0

Free Flow (we use this for ISIS)

Drowned Flow

Round Nosed Broad Crested Weir (free flow)

Research Based Approach

1st Solution – Cut Off the Crest

High Overflow

Research Based Approach

High Overflow

Research Based Approach

3rd Solution – Automated Gate

Modelling approach
• Define objectives
• Reduce downstream flooding
• Find optimal heights for sediment equilibrium
• Calibrate MIKE11 against observed levels
• Build same model in ISIS
• Compare results using ‘multi-model approach’
Multi-model approach
• Model is the sum of the experience of the person who wrote the code
Reduce downstream flooding
• Downstream weir removed
Reduce downstream flooding
• Four downstream weirs removed (1, 4, 5, 6)
Reduce downstream flooding
• Weirs removed and manning’s reduced
Sediment transport

Meyer-Peter formula

qs related to q, s0, d50

• Mean flow depth
• Mean channel width
• Mean velocity
• Channel Slope
• Particle diameter d50

http://ponce.sdsu.edu/onlinemeyerpeter.php

Conclusions
• MIKE11 results more sensitive to weir removal
• Cannot conclude on effectiveness of weir removal due to model disagreement
• Reduction of channel roughness better
• Proposals:
• Vegetation clearance downstream
• Alteration of weirs to improve sediment regime

Kim - our hydrological analysis expert

Sean and Ahmed who persistently work on Mike 11 and ISIS

Our report maker.

Stephane – our GIS expert

Fazlul is working on Mike 11 and ISIS

Prima and Rajmund are working on Mike SHE report

Acknowledgment

Prof. Dr.-Ing. habil Klaus-Peter Holz as team 5 supervisor and his patience for assisting us during Hydroeurope 2010

References

Wikipedia (2010). Weir. Wikipedia Foundation, Inc. http://en.wikipedia.org/wiki/Weir

White, Frank (2006). Fluid Mechanics. Mcgraw-Hill Education

Villemonte, James R. 1947. Submerged-Weir Discharge Studies, Engineering News. 1943. Engineering News Record, pp. 118-120. Record, pp. 54-57