Dyke Inventory and Elevation Verification


Historically the dykes around the Bay of fundy were constructed for the purpose of protecting agricultural lands. After WW II the Federal Government created an Organization called the Maritime Marshland Reclamation Agency which used modern construction techniques to reconstruct existing or recently breached dykes. At the same time each approved marsh was incorporated and the marsh boundaries were draw onto plans. Over time, in addition to increased value of agricultural production, there has been a significant increase in public and private development behind the dykes. Climate change brings with it anticipated sea level rises and an increase in the frequency and severity of storm events. These will put additional pressures our dykes and coastal areas which were designed to a level of risk associated with loss of farm land. The level of risk associated with engineering design to protect public infrastructure like, roads, railways, and utility corridors is considerably higher. This level of risk assessment requires knowledge of anticipated flood levels, critical dyke elevations, assessment of the vulnerability of the dykes to storm pressures. The design parameters for this level of flood protection are considerably higher than that employed 50 years ago when the dyke system was designed., The purpose of this project is to provide baseline data on current and potential critical dyke elevations and to identify and value infrastructure protected by the dykes. This would support the Department’s planning and maintenance for coastal protection and will provide critical data in support for risk and vulnerability assessments for climate change done under the ACAS (RAC) project., Database presenting updated current dyke elevations Infrastructure that is outside of the incorporated marsh, but is influenced by fresh or salt water flooding of the marsh (relative to top of dyke elevation). Value of the infrastructure ( assessed or any other value such as transportation, power or communication corridors) Land use (agriculture, commercial, residential, other) Agriculture % ( used, available, unavailable) Flood storage, watershed, drainage, structure capacity Value of land to agriculture This will include LIDAR data for the Kings, Amherst, and Annapolis areas. Other LIDAR sources may be added if available. A final report detailing the results and findings, This project represents an opportunity to add value through the RAC project by adding to and understanding of what is actually being protected by the dykes. The data on current critical dyke elevations will provide an opportunity to model potential flood events. Understanding the variety of public and private infrastructure and their uses is essential to understanding the impact of a flood event and to plan appropriate risk mitigation measures and to inform better planning decisions. This project will also address a current knowledge gap presented by a paper based dyke mapping system and the property value reporting system which is presented online in two dimensions.