STREAM CHANNEL HYDROLOGY HYDROLOGY MANAGEMENT ACTIVITIES IN WATERSHED Debris Flow Control Debris Basin at Evergreen Flood Control Channelization (1980's) Underground 850m culvert u/s Queens Road (GVRD 1960's) Open 200m culvert Thain (CNV 1999) previously underground Storm Water Catch basins on streets direct surface runoff to outfalls at creeks Slope and Erosion Control Channelization (1980's) 19th Street east slope (CNV 1995) u/s Westview culvert (CNV 1999) Thain Creek Biotech slope (DNV 2000) Low Level Bridge rip rap (CNV 1998) Flow Gauge Water Survey of Canada Station No.1: 08GA049 Stream Mapping Features and Location - GPS - all streams (DNV 1997) Features - measurements, photos - Mosquito Creek, Thain Creek (NSK/MCSS 1997) Erosion Points - photos - Mosquito, Wagg, Lower Mission, MacKay Creek (CNV 1998) WATER QUANTITY AND QUALITY Headwaters Forested, access road, old logging road and cuts, recreation trails, ski runs. Provides water source (rainwater and snowmelt) but potential for debris and sediment. Main Stem Flows Increased peak flows and frequency due to high percentage of impervious development. Bank erosion from hikers and dogs. Storm Water Storm drains drain a large urban area, with a high level of impermeable, which causes fluctuating water levels in streams. Non-point source water quality problems from urban runoff (esp Wagg and Lower Mission). Baseflow Maintenance Ground water reserves still exist, but some were filled in the past. Wetland areas very small. Forest limited to ravines and top of bank in mid watershed. Point Source Pollutants Small fill site leaching into creek south of CNV Works Yard. WATER QUANTITY AND QUALITY MANAGEMENT ACTIVITIES IN WATERSHED Water Recycling Use of grey water system for equipment (CNV Works Yard) Catch Basin Filters Use of Oil and Grit Interceptors (CNV, DNV) Use of fibre sock filters (DNV) Storm Drain Marking Embossed fish symbol on grates (CNV) Painted fish symbol on some grates (volunteers) Water Quality Monitoring Continuous monitoring for 1 year - Wagg Creek (CNV 1998) Benthic Assessment - Mosquito Creek, Wagg Creek (GVRD 2000)