CONTENT. Guillermo Soto Conde Ingeciencia. Emilio Arturo Hernández Chaupis Compañia Operadora de Gas del Amazonas

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1 Emilio Arturo Hernández Chaupis Compañia Operadora de Gas del Amazonas CLICK TO EDIT Edward MASTER Francisco Oliveros TITLE Montes STYLE Compañia Operadora de Gas del Amazonas Guillermo Soto Conde Ingeciencia Lima, Peru, July 2017 CONTENT I. INTRODUCTION II. BACKGROUND III. GEOHAZARD HUAYCO TYPE (SOIL FLOWS) IV. PHYSICAL CHARACTERIZATION OF HUANCANO CREEK V. RISK MITIGATION ACTIONS VI. CONCLUSIONS 1

2 CONTENT I. INTRODUCTION II. BACKGROUND III. GEOHAZARD HUAYCO TYPE (SOIL FLOWS) IV. PHYSICAL CHARACTERIZATION OF HUANCANO CREEK V. RISK MITIGATION ACTIONS VI. CONCLUSIONS Geographical distributionof project 2

COSTA : 100 mm/año SIERRA : 2000 mm/año SELVA : 6000 mm/año 210 km Capacidad: 1.

Kp 127 24 (135 Km) 14 (19 Km) PS #4 PS #3 PS #2 PS #1 PRS#3 PRS#2 PRS#1 10 (107

INTRODUCTION II. BACKGROUND III. GEOHAZARD HUAYCO TYPE (SOIL FLOWS) IV.

3 COSTA : 100 mm/año SIERRA : 2000 mm/año SELVA : 6000 mm/año 210 km Capacidad: MMSCFD 18 (212 Km) PCS #2 Melchorita PCS #1 24 (310 Km) PCCH 32 (208 Km) PC- Kp (135 Km) 14 (19 Km) PS #4 PS #3 PS #2 PS #1 PRS#3 PRS#2 PRS#1 10 (107 Km) km 14 (453 Km) km km 0 km Capacidad: BPD CONTENT I. INTRODUCTION II. BACKGROUND III. GEOHAZARD HUAYCO TYPE (SOIL FLOWS) IV. PHYSICAL CHARACTERIZATION OF HUANCANO CREEK V. RISK MITIGATION ACTIONS VI. CONCLUSIONS 3

Influence of the Coastal Nino weather phenomenom Low Affectaction Area Medium Affectation Area

Population People affected by heavy rains (Indeci) Fallecidos Fatalities 138 Casualties

4 Influence of the Coastal Nino weather phenomenom Low Affectaction Area Medium Affectation Area High Affectation Area Fig. 2. Comparison with Coastal Nino occurred in 1925 Fig. 1. Level of a ffectation of CoastalNino in Peru Influence of the Coastal Nino weather phenomenom Population People affected by heavy rains (Indeci) Fallecidos Fatalities 138 Casualties Damnificados Affected Afectados Casualties: who have suffered direct damage, as the result of a collective misfortune. Affected: who have suffered indirect damage, as the result of a collective misfortune 4

5 Influence of the Coastal Nino weather phenomenom Highway affected La Libertad Infrastructure Puentes Damaged Afectados bridges Puentes Destroyed Destruidos bridges 1,224 bridges 801 bridges Damaged Vías Afectadas routes 25,602 Km Destroyed Vías destruidas routes Viviendas Damaged Afectadas homes Viviendas Destroyed Destruidas homes 7,622 Km 93,670 homes 469,696 homes Virú bridge North Pan American Highway The affected roads/highways have tripled compared to ENSO The agriculture and mining sectors have also been affected. Collapsed road Lima Flooded streets Piura Collapsed railway East of Lima Collapsed bridge Lima Collapsed highway Lambayeque Collapsed house East of Lima 5

Affected population Piura Rescue of people Lima Collapsed bridge Ancash Collapsed bridge Piura Flooded streets La

Cos ts of the Coastal Nino in the infrastructure Item US$ millon Parcial % Highw ay s 1.

628 16% Rural roads 68 2% Health infrastructure 91 2% Total 4.015 100% Ta bl e 2.

20% -0.70% Metal Minning 6.50% 5% Non-primary manufacturing -0.20% -0.90% Construction 3.70% 4.50% Commerce 2.30% 1.

90% Note: According to studies carried out by some local consultants, the reconstruction of the infrastructure

6 Affected population Piura Rescue of people Lima Collapsed bridge Ancash Collapsed bridge Piura Flooded streets La Libertad Influence of the Coastal Nino weather phenomenom Ta bl e 1. Cos ts of the Coastal Nino in the infrastructure Item US$ millon Parcial % Highw ay s % Households % Bridges % Grow ing Areas 234 6% Educational institutions 152 4% Irrigation Channels % Rural roads 68 2% Health infrastructure 91 2% Total % Ta bl e 2. Impact of the Coastal Nino in Gross Domestic Product Sector Without Coastal Nino With Coastal Nino Agricultural 1.20% -0.70% Metal Minning 6.50% 5% Non-primary manufacturing -0.20% -0.90% Construction 3.70% 4.50% Commerce 2.30% 1.60% Other services 4.30% 3.80% GDP Global 3.40% 2.90% Note: According to studies carried out by some local consultants, the reconstruction of the infrastructure damaged by Coastal Nino would reach between US $ 7,000 and US $ 10 billion, equivalent to half of the deposits held by the public sector in the financial system. On the other hand, the investment value projected in the Master Plan for Geotechnical Works for the Costa sector is approximately US $ 5 million. 6

PHYSICAL CHARACTERIZATION OF HUANCANO CREEK V. RISK MITIGATION ACTIONS VI.

7 CONTENT I. INTRODUCTION II. BACKGROUND III. GEOHAZARD HUAYCO TYPE (SOIL FLOWS) IV. PHYSICAL CHARACTERIZATION OF HUANCANO CREEK V. RISK MITIGATION ACTIONS VI. CONCLUSIONS River crossings and Creeks Activated in 2017 SUBFLUVIAL CROSSES AFFECTED BY HUAYCOS IN 2017 LEVEL High Medium KP Huáncano 7

8 CONTENT I. INTRODUCTION II. BACKGROUND III. GEOHAZARD HUAYCO TYPE (SOIL FLOWS) IV. PHYSICAL CHARACTERIZATION OF HUANCANO CREEK V. RISK MITIGATION ACTIONS VI. CONCLUSIONS It is necessary to know: Geomorphological Aspects Geological Aspects Seismicity Hydrography Structural Aspects Soils Material transport zone Origin and recharge zone Geotechnical and Geomechanical Aspects 8

9 Location Creek Huancano KP KP KP KP CONTENT I. INTRODUCTION II. BACKGROUND III. GEOHAZARD HUAYCO TYPE (SOIL FLOWS) IV. PHYSICAL CHARACTERIZATION OF HUANCANO CREEK V. RISK MITIGATION ACTIONS VI. CONCLUSIONS 9

10 Location Creek Huancano Flow direction 11 m Pipelines Works 2012 Flow direction Pipelines Rock outrigger Settler N 02 Gabion protection Settler N 01 Settlers 10

11 Assessment of erosion Creek Huancano 2017 Pisco Deformation of gabions in first step December January Central gully formation breaking the structure of energy dissipators Depenningof gully and dismantling of bottom Rip Rap January January Assessment of erosion Creek Huancano m Pipelines 5 m Flow direction 11

BACKGROUND III. GEOHAZARD HUAYCO TYPE (SOIL FLOWS) IV.

12 Works 2017 Lateral protection Rip Rap Pipelines Energy disippators Rock outrigger Flow direction CONTENT I. INTRODUCTION II. BACKGROUND III. GEOHAZARD HUAYCO TYPE (SOIL FLOWS) IV. PHYSICAL CHARACTERIZATION OF HUANCANO CREEK V. RISK MITIGATION ACTIONS VI. CONCLUSIONS 12

13 Conclusions Prior to the construction of the pipeline transport system in coastal environments, it is important to carry out an adequate hydraulic and geotechnical characterization of the torrential creeks, since for the design of subfluvial crossings with this type of channel, in some cases the erosive power of the Huaycos is underestimated, and therefore inadequate depth is established for the installation of the pipelines, which may imply a considerable investment in the medium term for the maintenance of protection works. It is necessary to perform a constant monitoring of the hydraulic behavior of subfluvial crossings of the STD of Camisea, before, during and after the rainy season; due to the activation of Huaycos events, for the implementation of protection works for the STD, and also to consider maintenance works in short periods that can increase the life span of the implemented works. In the case of the Huáncano project it is possible to carry out the removal of buffer pools and upstream settlers, to reduce the impact on the works. Conclusions Prior to the construction of a pipeline transport system in coastal environments, it is important to carry out an adequate hydraulic and geotechnical characterization of the torrential creek, since for the design of subfluvial crossings with this type of channel, in some cases The erosive power of the Huaycos is underestimated, and therefore insufficient depth is established for the installation of the pipelines, which may imply a considerable investment in the medium term in the maintenance of the protection works. Prior to the construction of a pipeline transport system in coastal environments, it is important to carry out an adequate hydraulic and geotechnical characterization of the torrential creek, since for the design of subfluvial crossings with this type of channel, in some cases The erosive power of the Huaycos is underestimated, and therefore insufficient depth is established for the installation of the pipelines, which may imply a considerable investment in the medium term in the maintenance of the protection works. 13

Conclusions In the rivers crossings with exposure of the pipelines there were no extraordinary flows during the operation of the project, or rains of similar intensity, at least in the last thirty

14 Conclusions In the rivers crossings with exposure of the pipelines there were no extraordinary flows during the operation of the project, or rains of similar intensity, at least in the last thirty years. Also, it is emphasized that in these crosses a strong antropic intervention exists that modifies the hydraulic conditions of the rivers and, therefore, the rivers acquire a greater capacity of undermining and damage to the works executed in previous years. Thank You. 14

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