EBA Engineering ConsultCfnts Ltd.

Transcription

1 I EBA Engineering ConsultCfnts Ltd. DETAILED TERRAIN STABILITY MAPPIN WAPCREEK RIVERSIDE FOREST PRODUCTS Lnv.DTE ARl\1STRONG DIVISION EBA Project No #255, 1715 Dickson Avenue, Kelowna, British Colqmbia V1Y9G6 Tel: (250) Fax: (250) Intemet: Icelowna@ebaJca - Web Site: http//

2 I I DETAILED TERRAIN STABILIfV MAPPING Wap Creek Prepared by: I EBA ENGINEERING CONSUL1ANTS LTD. Kelowna, B.C. Submitted to: RIVERSIDES FOREST PRODU01ifS LIMITED Armstrong Division i EBA Project No March, 2002 This project has been fund~d by FOREST RENEWAL BRITISH <COLUMBIA I

3 ! I I TABLE OF CONTENfI'S Page 1.0 INTRODUCTION METHODOLOGY...: Terrain Mapping Mapping Reliability Terrain Stability Interpretation Soil Erosion Potential Class PHySIOGRAPHy Topography and Bedrock Geology Landscape Evolution and Deposition of Surficial Materials SURFICIAL MATERIALS AND ASSOCIATED rlandforms Till (M)... J Glaciofluvial Materials (FG).....! ; 4.3 Colluvium (C) Fluvial Materials (F) Weathered Bedrock (D) Organic (0)... l ACTIVE GEOMORPHOLOGICAL PROCESSES.j Rapid Mass Movement (-R, -R") and Slow ass Movement (-F, -F") Debris Slides (-Rs, -R"s) and DebrisjFlows (-Rd, -R"d) Rockfall (-Rb, -R"b)...: Rockslump (-F"m)... ~ Gully Erosion (-V) Glacial Meltwater Channels (-E)... L Abundant Seepage (-L)... l Snow Avalanche (-A)... l TERRAIN STABILITY AND SOIL EROSION POTENTIAL - DISCUSSION AND MANAGEMENT IMPLICATIONS Terrain Stability Class and Soil Erosion Potential Class - Discussion Terrain Stability and Soil Erosion Potential - Management Implications RECOMMENDATIONS ACKNOWLEDGMENTS REFERENCES I 10.0 CLOSURE I

4 TABLES Page Table 2.1 Table 2.2 Terrain Stability Mapping Projects Complet~d Adjacent to the Wap Creek Study Area... J... 2 TRIM Sheets and Air Photographs Table 2.3 Field-Checking Statistics for the Total Area Including Alpine... 4 Table 2.4 Table 2.5 Table 2.6 Table 6.1 Field Checking Statistics for Polygons Mapped as Terrain Stability Classes IVTR, IV and V... ~... 4 I Guidelines for the Assessment of Detailed Tj Stability Classes... 6 Guidelines for the Assessment of Soil Erosir Potential Classes...,... 7 Implications of Detailed Terrain Stability CIftsses Table 6.2 Management Implications of Soil Erosion P&tential Classes FIGURES r... Figure 1... Traverse Map Figure Bedrock Geology Map APPENDICES Appendix A... r... Annotated Photographs! Appendix B... f... Legend I Appendix C... L, I I r i... Field Forms

5 March 21, INTRODUCTION! The objective of this project was to prepare detail~d (TSIL C) terrain stability mapping for Wap Creek, located within the operating area bf Riverside Forest Products Limited, Armstrong Division. This information is presentkd on 1 :20,000 scale terrain stability maps. EBA Engineering Consultants Ltd. (EBA~ completed the project for Riverside Forest Products Limited, with funding provided y Forest Renewal British Columbia (FRBC). The Wap Creek study area (7937 ha) is located b tween Three Valley Lake and Mabel Lake about 28 km east of Sicamous, BC. It streches from near Mount Griffm in the north to the mouth of Derry Creek in the south, i from the headwaters for Cavanaugh Creek in the west to a peak near Joss Mountain in the east (see Figure 1). Terrain mapping and interpretation of terrain sta~i1ity and soil erosion potential were carried out according to the provincial standards (Section 2.0). Terrain mapping was done on approximately l: 17,000 scale, colour rur photos by air photo interpretation followed by limited field checking. This report augments the information that is shown on the accompanying maps completed for this projept. I 2.0 METHODOLOGY 2.1 Terrain Mapping I The terrain mapping methods followed the Be pro~incia1 guidelines and standards set by the Resources Inventory Committee (RIC, 199p) and the Forest Practices Code Guidebook (FPC, 1999). Terrain classification followed the provincial system (Howes and Kenk, 1997). I I The Wap Creek study area boundary has been edg~-matched to existing adjacent terrain stability mapping project areas and the Mount Griffin Ecological Reserve and the Mount I Griffin Protected Area. Terrain Stability Mapping previously completed in nearby areas is listed in Table 2.1.

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