Evaluation Of The Old Dam Hydraulic On The New Dam Plan On The Weir Weigh Opponent In Langkat Regency.

Feb 28, 2025 by ADMIN 103 views

**Evaluation of Old Dam Hydraulic vs. New Dam in the Opponent, Langkat: Ensuring Safety and Function**

Introduction

The opponent's wend weir in Langkat Regency, North Sumatra, plays a vital role in irrigating agricultural land and supporting tourism activities in the Bukit Lawang area. This weir has undergone renovations from Kali stone buildings into cast concrete construction after flash floods hit in 2003. The purpose of this study is to evaluate the security and suitability of the old weir with a new weir development plan. Hydraulic analysis is carried out to determine the plan flood discharge and subsequently evaluate the stability of the old weir and new weir.

Methodology

To determine the plan flood discharge, frequency analysis and rainfall data are distributed. Chi-squad test shows the Pearson Type III log distribution is most suitable for rainfall data in this region. By using this distribution, a flood discharge is obtained by a 100-year re-plan (Q100) with several methods:

Flood Discharge Calculation Methods

Haspers-Haspers method: Q100 = 497,034 m3/sec
PEARSON III HASPERS-LOG METHOD: Q100 = 398,866 m3/second
Melchior-Haspers Method: Q100 = 266,716 m3/sec
Melchior-Log Pearson III Method: Q100 = 322.256 m3/sec

Dam Stability Analysis: Looking for a Safe and Durable Solution

The results of dam stability analysis show that with flood discharge Q100 = 322,256 m3/second, old weir failure (broken). Conversely, the new weir with cast concrete construction is proven to be able to withstand the burden of the water. This is indicated by several factors:

Factors Affecting Dam Stability

Free Tensile voltage: New weir does not experience tensile stress that can cause cracks and damage.
Larger resistant moments: Moment of resistance (MT) in a new weir is greater than the moment of bolsters (Mg), signifying the structure of the weir is stronger and more stable.
Not shifting: New weir does not experience a shift or movement that can threaten the integrity of the structure.
Safe soil voltage: The tension of the soil that occurs in the new weir does not exceed the allowable soil tension limit.

Conclusion: New Weir Meets Safety Standards and Planning Criteria

Based on the results of the hydraulic evaluation and stability analysis, it can be concluded that the planned new dam is safer and in accordance with the planning criteria. Strong and sturdy cast concrete construction is able to withstand plan flood discharges, prevent structural failures, and guarantee the smooth function of weir as vital infrastructure for irrigation and tourism in the Bukit Lawang area.

Recommendations

This study provides important recommendations for the development of water infrastructure in flood-prone areas. The use of the right analysis method and the selection of quality construction materials is a key factor in building a safe, effective and sustainable dam.

Future Research Directions

Future research should focus on the following areas:

Improving flood discharge calculation methods: Developing more accurate and reliable methods for calculating flood discharge is essential for ensuring the safety and effectiveness of dams.
Enhancing dam stability analysis: Further research is needed to improve the analysis of dam stability and to develop more effective methods for predicting and preventing dam failures.
Investigating the impact of climate change: Climate change is expected to increase the frequency and severity of floods, making it essential to investigate the impact of climate change on dam safety and effectiveness.

Conclusion

In conclusion, this study has demonstrated the importance of evaluating the security and suitability of old dams with new dam development plans. The results of this study have shown that the planned new dam is safer and in accordance with the planning criteria. Strong and sturdy cast concrete construction is able to withstand plan flood discharges, prevent structural failures, and guarantee the smooth function of weir as vital infrastructure for irrigation and tourism in the Bukit Lawang area.

Q1: What is the purpose of this study?

A1: The purpose of this study is to evaluate the security and suitability of the old weir with a new weir development plan in the opponent, Langkat Regency, North Sumatra.

Q2: What methods were used to determine the plan flood discharge?

A2: Frequency analysis and rainfall data were distributed using the Pearson Type III log distribution, which is most suitable for rainfall data in this region. Several methods were used to calculate the flood discharge, including the Haspers-Haspers method, PEARSON III HASPERS-LOG METHOD, Melchior-Haspers Method, and Melchior-Log Pearson III Method.

Q3: What are the results of the dam stability analysis?

A3: The results of the dam stability analysis show that with flood discharge Q100 = 322,256 m3/second, the old weir fails (broken). Conversely, the new weir with cast concrete construction is proven to be able to withstand the burden of the water.

Q4: What factors affect the dam stability?

A4: Several factors affect the dam stability, including free tensile voltage, larger resistant moments, not shifting, and safe soil voltage.

Q5: What are the conclusions of this study?

A5: Based on the results of the hydraulic evaluation and stability analysis, it can be concluded that the planned new dam is safer and in accordance with the planning criteria. Strong and sturdy cast concrete construction is able to withstand plan flood discharges, prevent structural failures, and guarantee the smooth function of weir as vital infrastructure for irrigation and tourism in the Bukit Lawang area.

Q6: What are the recommendations of this study?

A6: This study provides important recommendations for the development of water infrastructure in flood-prone areas. The use of the right analysis method and the selection of quality construction materials is a key factor in building a safe, effective and sustainable dam.

Q7: What are the future research directions?

A7: Future research should focus on the following areas:

Improving flood discharge calculation methods: Developing more accurate and reliable methods for calculating flood discharge is essential for ensuring the safety and effectiveness of dams.
Enhancing dam stability analysis: Further research is needed to improve the analysis of dam stability and to develop more effective methods for predicting and preventing dam failures.
Investigating the impact of climate change: Climate change is expected to increase the frequency and severity of floods, making it essential to investigate the impact of climate change on dam safety and effectiveness.

Q8: What are the implications of this study?

A8: The implications of this study are significant, as it highlights the importance of evaluating the security and suitability of old dams with new dam development plans. The results of this study have shown that the planned new dam is safer and in accordance with the planning criteria, which has important implications for the development of water infrastructure in flood-prone areas.

Q9: What are the limitations of this study?

A9: This study has several limitations, including the use of a limited dataset and the reliance on a single analysis method. Future research should aim to address these limitations and provide more comprehensive and accurate results.

Q10: What are the future applications of this study?

A10: The future applications of this study are numerous, including the development of more effective and sustainable dams, the improvement of flood discharge calculation methods, and the enhancement of dam stability analysis.