Water Stewardship Information Sources
| ID | 576 |
|---|---|
| Citation | Ecoscape Environmental Consultants Ltd. 2010. Foreshore Inventory and Mapping: Okanagan Lake South. Prepared for Regional District of Okanagan Similkameen. |
| Organization | RDOS |
| URL | http://www.peachland.ca/cms/wpattachments/wpID60atID595.pdf |
| Abstract/Description or Keywords | This report summarizes the current condition of the shoreline areas of Okanagan Lake south and is intended to help relevant stakeholders manage the shoreline in a sustainable manner. The intent of this document is to provide relevant stakeholders with information to facilitate future land use planning on the Okanagan Lake South foreshore. This project is step one of a process of inventory and planning exercises that are happening around the province: 1. Step 1 - Shoreline Inventories following the Foreshore Inventory and Mapping (FIM) protocol (Appendix A) and additional fisheries and wildlife inventories to identify other sensitive features of concern. Inventories are conducted using a variety of methods and data was utilized from numerous different sources; 2. Step 2 - An Aquatic Habitat Index (AHI) is generated using the FIM data to determine the relative habitat value of the shoreline. This index follows similar methods that were developed for Shuswap Lake, Windermere Lake, Moyie and Monroe Lake and is similar to other ongoing assessments along Mabel, Tie and Rosen Lakes, and Columbia Lake. 3. Step 3 - Shoreline Management Guidelines have been prepared for the shorelines surveyed to facilitate making informed land use decisions for our watersheds. The Shoreline Management Guidelines are intended to provide background information to stakeholders, proponents, and governmental agencies when land use changes or activities are proposed that could alter the shoreline thereby affecting fish or wildlife habitat. The data provided in this document can be incorporated into land policy documents, such as Official Community Plans or Bylaws. The information collected during this assessment will be used as a baseline and allow development of specific objectives to be prepared for shoreline protection. Once objectives have been prepared, the methodology will allow managers to assess and measure whether the specific shoreline objectives have been met over time. Okanagan Lake is one of the most significant features of our valley. The lake acts as our drinking water source, is critical habitat for numerous fish and wildlife species, and is a focus point of lakeshore communities. The south end of Okanagan has the following different local government areas which are partly responsible for managing the lake shoreline: Regional District Okanagan Similkameen, District of Summerland, District of Peachland, City of Penticton, and the Penticton Indian Band. Foreshore Inventory and Mapping results (FIM) for this project provides valuable information regarding features, habitats, and other information for the shorelines of these lakes. A summary of the data collected indicates the following: ﾃ It is estimated that 48.6% of the shoreline has a high level of impact which accounts for 46.1 km of shoreline. Areas of moderate and low impact account for 15.3% or 14.5 km and 36.1% or 34.2 km of the shoreline respectively. Impacts along the shoreline include lakebed substrate modification (e.g., infill below HWL), vegetation removal, construction of retaining walls, docks and other ladnscaping features; The most predominant land use around the lake was rural (32.3%), followed by natural areas in Okanagan Mountain Park shorelines (24.5 %). Transportation areas were the third most commonly observed land use type, accounting for 14.0% of the shoreline (i.e., areas along Highway 97). Single family residential areas accounted for 13.9% or 13.2 km of the shoreline; ﾃ Wetlands were the most rare shore type around the Okanagan Lake South, accounting for only 0.9 % of the shoreline length. Significant impacts to wetland communities were apparent in many areas. The most predominant shore types around the lake are Cliff / Bluff and Gravel beach shores, which account for about 43.6% and 30.6% respectively. Rocky shores and sand beaches were found along 14.0 % and 7.8% of the shoreline respectively. Stream confluences accounted for 2.5% or 2.3 km of the shoreline; and, ﾃ Aquatic vegetation occurs along 6.5% of the shoreline length. Of this, emergent vegetation was the most commonly observed (e.g., emergent grasses, willows, or other areas with vegetation inundated during high water). Native beds of submergent vegetation were not documented along shoreline very extensively, due to the large littoral zones. No areas of floating vegetation were observed. The following summarizes habitat modifications observed: ﾕ Docks were the most common modification observed, with a total of 333 structures recorded. ﾕ Retaining walls were the next most common modification, with a total of 212 separate structures stretching over an estimated 9.8 km (10%) of the shoreline. In many cases, retaining walls extended beyond the high water level of the lake and typical construction practices observed were not compliant with Best Management Practices. ﾕ Groynes were relatively frequent, with a total of 164 recorded. ﾕ There were a total of 23 boat launches and 9 marinas with over 6 slips. ﾕ Substrate modification was observed on 47% of the shore length and was most commonly associated with retaining walls, transportation land uses, and beach grooming. The findings of the FIM indicate that the foreshore areas of Okanagan Lake South have been impacted by our current land use practices. The surveys indicate that in more densely developed areas, impacts are greatest. It was readily apparent that where intense development was present most habitat features had been impacted or impaired in some way. Despite these impacts, many areas around the shoreline remain in a relatively natural condition. The lake shore still supports diverse communities in rural areas, where the often steep, highly erodible soils are not readily developable. Maintaining of the rural nature of the shore line areas will help reduce future impacts along the shoreline. Future land development should direct intensive development to previously developed areas using infill. Infill development will provide opportunities to restore shoreline features and habitat function. |
| Information Type | report |
| Regional Watershed | Okanagan |
| Sub-watershed if known | |
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| Comments | |
| Project status | complete |
| Contact Name | Ecoscape Environmental Consultants Ltd |
| Contact Email | [email protected] |