Viii lid technology: case studies and watershed restoration

Figure 4 – Highwood Estates – Stormwater Basins (NCD)

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Figure 5 – Gully Erosion from Figure 6 – Sediment Deposition in Lake Failing Basin Agricultural and Livestock Access.

Figure 4 – Highwood Estates – Stormwater Basins (NCD)

The increased flows out of the basins have adversely impacted the natural receiving stream, which has resulted in the significant channel erosion shown in Figure 5. This eroded material has then created a sediment delta in Northfield Lake containing over 1,000 cubic yards of material. The sediment delta is shown in Figure 6.

Figure 5 – Gully Erosion from Figure 6 – Sediment Deposition in Lake Failing Basin

Agricultural and Livestock Access. Reviewing aerial photographs showed that agricultural activities could also be partially responsible for the impairment in the watershed. A follow up visual assessment showed unfettered access for livestock to streams and riparian areas (Figure 8 below). Livestock access to stream channels causes the following types of Water Quality degradation:

Destruction of the riparian vegetation,
Erosion of the stream channel, banks, & riparian areas and the resultant in-stream sediment deposition,
Introduction of nutrient loads from rich animal waste being carried into the stream by stormwater runoff,
Pollutant loads from animal waste being directly deposited in the stream, and
Degradation of stream channel stability and aquatic habitat.

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