EROSION AND SEDIMENT CONTROL MANUAL

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Erosion and Sediment Control Manual for the Darling Range, Perth, Western Australia 72
Erosion and Sediment Control Manual for the Darling Range, Perth, Western Australia PROJECT: EROSION AND SEDIMENTATION CONTROL MANUAL LOCATION: DARLING RANGE SUBJECT: WORK SHEET Site location (Lot No.)___________________________________________ Shire_____________________ Proposed area of disturbance at the site _____________________ Catchment area upslope of the site _____________________ Upslope catchment characteristics (i.e. % cleared) _____________________ Average gradient of the site _____________________ (Note: Slope gradients may be changed by works at the site). Other features such as the natural drainage lines, etc._______________________________________________ _________________________________________________________________________________________ Erosion Risk Assessment Table 1. Soil erodibility potential Soil erodibility potential Soil description Group symbol Emerson class no. Low Sandy gravels GP > 2 Moderate Non dispersive and slightly dispersive clays and clayey sands, clayey gravels, silty gravels, sands High Silts, silty sands, fine sands, dispersive clays and clayey sands, water repellent sands Table 2. Erosion risk assessment by soil loss class Soil erodibility potential (as defined in Table 1) Site slope 5%-10% Site slope 10%-20% CH, CL, CI, SC, GC, GM, SP ML, SM, CH, CL, CI, SC Site slope > 20% Low 1 1 1 Moderate 1 1 2 High 1 2 2 Table 3. Development approaches Development approaches Soil loss class 1 2 Action Action Planning of control measures as part of an ESCP Recommended Required Implement control measures in Section 3 where appropriate Required Required Staged Construction and Progressive rehabilitation Consider Required Divert runoff around the site Consider Required Site soil loss class (based on Tables 1 and 2) _____________________ Proposed control measures ___________________________________________________________________ _________________________________________________________________________________________ _________________________________________________________________________________________ > 2 1, 2 73
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EROSION AND SEDIMENT CONTROL MANUAL

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