4cSU11. Dymchurch. Hold the Line Authorised by

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1 Survey Unit Location SMP Policy Author RT 4cSU11 Dymchurch Hold the Line Authorised by AS Published 19/12/2017 The 9km stretch of beach consists predominantly of shingle to the southwest of Dymchurch, and sand to the northeast. The frontage is divided by timber groynes at m spacing throughout almost all of its length with the exception of a terminal rock groyne situated at St. Mary s Bay. A large rock and concrete revetment extends from Martello Tower No. 25 to the eastern boundary of 4cSU11. Survey outcome: RBMP design levels have not been calculated for Dymchurch, so the Cross Sectional Area (CSA) cannot be assessed in relation to Standard of Protection (SoP), but the profile ranges have been plotted to show the current CSA in relation to historic levels. Please note that 2012 has been used as the baseline survey due to the completion of a concrete apron and a rock and stepped revetment in 2011 between Jesson Outfall and Hythe Ranges. Survey type Survey dates Most recent survey: Spring 2017 Comments Insignificant changes are observed on most profiles south of Jesson Outfall. Profile 4c00557 shows the greatest change with a loss of 11m 2 (-6%). Autumn to Spring Profile change 21/10/ /03/2017 Low level changes, both erosive and accretive are seen between Jesson Outfall and Martello Tower No.23. Profile 4c00488 gained 4m 2 (7%) and Profile 4c00464 lost 6m 2 (-10%). Most of the 13 profiles fronting the rock revetment show significant changes. Profile 4c00449 lost 10m 2 (-21%) and Profile 4c00416 gained 8m 2 (47%). Please note that some of the percentage changes are exaggerated by small CSAs and may only reflect a small absolute CSA change.

2 Survey type Survey dates Most recent survey: Spring 2017 Comments Low level changes, mainly accretive, are observed on profiles south of Jesson Outfall. 13 of the 21 profiles are accretive, with Profiles 4c00592 and 4c00549 showing gains of 23m 2 (17%) and 26m 2 (15%) respectively. Spring to Spring Baseline to Spring Spring to Summer 26/02/ /03/ /06/ /03/2017 Significant changes, mostly erosive, are shown between Jesson Outfall and Martello Tower No.23. Profile 4c00464 lost 11m 2 (- 17%). Significant changes, both erosive and accretive are observed on profiles fronting the rock revetment. Profile 4c00449 lost 17m 2 (-31%) and Profile 4c00416 gained 9m 2 (56%). Please note that some of the percentage changes are exaggerated by small CSAs and may only reflect a small absolute CSA change. Significant changes, mostly accretive, are seen on profiles south of Jesson Outfall. A significant number of profiles have gains of above 10%, with Profiles 4c00620 and 4c00549 gaining 19m 2 (13%) and 35m 2 (21%) respectively. Most profiles between Jesson Outfall and Martello Tower No.23 show significant accretion, with five consecutive profiles gaining at least 10% in beach material. Profile 4c00534 gained 13m 2 (24%). Profiles fronting the rock revetment show significant changes, with 11 of the 13 profiles accreting. Profiles 4c00449 and 4c00416 gained 19m 2 (100%) and 13m 2 (108%) respectively. Please note that some of the percentage changes are exaggerated by small CSAs and may only reflect a small absolute CSA change.

3 Survey type Survey dates Most recent survey: Spring 2017 Comments Summer to Autumn Baseline to Summer Summer to Summer Topographic difference model and Profile change

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27 Interim Report - Appendix A: Explanation of the Historic Summary Chart The historic changes in Cross-Sectional Area (CSA) for each profile are summarised by identifying the historic highest and lowest CSA alongside the current CSA for each profile: FIGURE A1: PRESENTATION OF STANDARD OF PROTECTION AND TRIGGER LEVELS (A) HISTORIC VARIATION OF BEACH LEVELS (CSA) (B) SUMMARY OF DATA, PINK BAR CURRENT BEACH LEVEL, BLACK BARS HISTORIC HIGH AND LOW

28 Appendix B: Profile Change Summary Changes along individual profiles for a range of timeframes are summarised in a series of thematic maps on the previous pages. The maps show the location of each beach profile, superimposed on aerial photography (note the lines have been extended for clarity). The name of the profile, the percentage change of beach material and the change in m 2 has been including upon the line, which is illustrated in Figure B1. FIGURE B1: PRESENTATION OF THE PROFILE CHANGE SUMMARY

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