Gabion wall La Hachadura, El Salvador Second opinion Cordaid 17 November 2014 Final draft BD5042.101 HASKONINGDHV NEDERLAND B.V. RIVERS, DELTAS & COASTS Barbarossastraat 35 Postbus 151 Nijmegen 6500 AD The Netherlands +31 24 328 42 84 Telephone Fax
[email protected] E-mail www.royalhaskoningdhv.com Internet Amersfoort 56515154 CoC Document title Gabion wall La Hachadura, El Salvador Second opinion Document short title Second opinion gabion wall La Hachadura Status Final draft Date 17 November 2014 Project name Second opinion gabion wall La Hachadura Project number BD5042.101 Client Cordaid Reference BD5042.101/R00001/423630/Afrt Drafted by Albert Wiggers, Filip Schuurman Checked by Michel Tonneijck Date/initials check …………………. …………………. Approved by Michel Tonneijck Date/initials approval …………………. …………………. A company of Royal HaskoningDHV SUMMARY Second opinion gabion wall La Hachadura - i - BD5042.101/R00001/423630/A Final Draft 17 November 2014 CONTENTS Page 1 INTRODUCTION 1 1.1 Background 1 1.2 Objectives 1 1.3 This report 2 2 OBSERVATIONS 3 2.1 General setting 3 2.1.1 Conditions 3 2.1.2 La Hachadura 3 2.1.3 Rio Paz 3 2.1.4 Critical flood risk locations 4 2.2 Morphological evolution Rio Paz near La Hachadura 5 2.2.1 Observations 5 2.2.2 Historical events 5 2.2.3 Conclusions from comparison satellite images 9 2.3 Design and construction of the Gabion Wall 11 2.4 Local common practise 18 3 SECOND OPINION 19 3.1 Motivation of chosen solution for flood protection 19 3.2 Motivation partial construction of first 300 m 19 3.3 Hydraulic boundary conditions and river behaviour 19 3.4 Topographical and geotechnical survey 19 3.5 Structure Error! Bookmark not defined.