Document library Small earthworks guidelines - erosion and sediment control for small sites

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Category	this document is uncategorised
Title	Small earthworks guidelines - erosion and sediment control for small sites
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Date published	15 June 2006
GWRC Publication No	GW/RINV-G-06/108
Abstract	The erosion of topsoil from vegetation clearance and earthwork sites is a problem throughout much of the Wellington region. The combination of high rainfall, hilly terrain, clayey soil and underlying geology means that if soil is disturbed during site development, it is easily washed away by rainfall. Thousands of tonnes of soil are lost this way in each rain event, and cause a range of problems in our waterways. A typical hilly subdivision site in the Wellington region, once cleared of vegetation could lose up to one thousand tonnes of soil per hectare per year. While individual sites may not export a large quantity of sediment, if there are multiple subdivision sites in a catchment the overall effect on the environment can be signifi cant. Soil entering a waterway from your site can cause problems for several kilometres downstream, the most obvious being colour change.

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