Bank erosion was present at several locations of the reach of Sussman Park Stream. Though not extensive, the eroding areas contributed a significant sediment load to the downstream areas. Problems developed from a combination of increased flows in the stream and fill material that modified the floodplain. These factors shifted flood flows prompting the erosion at pressure points.
In the central portion of the park, a wide, low floodplain was present on the south side of the channel. This floodplain region, though fully vegetated, appeared to be an active fluvial surface. Channel substrate was variable, with frequent exposed sections of bedrock and regolith, as well as areas of sand and gravel. The combination of large residual cobbles and finer sediments produced a typical bi-modal distribution of sediment throughout the system. The construction was completed in 1999.
Based on an evaluation and assessment of the stream, the following mitigation goals were implemented:
- Establish stable channel geometry for low and high flows.
- Enhance water quality and reduce localized erosion.
- Stablize eroded banks.
- Enhance warm water fisheries habitat.
- Maintain and promote efficient sediment transport.