RFI - Attachment F - Engineering Report

                                                                     Loading Rates Total
                                                                  Urban Comm. Base Load
Particles < 1.18mm                  Loading Rates (kg/ha/yr)          227      660          516   328
Partials 1.18mm< X<4.75mm           Loading Rates (kg/ha/yr)          147      394          238   196
Particles >4.75mm                   Loading Rates (kg/ha/yr)          44       234          60    76


Total Particles                     Load Rates For the Kg/ha/Yr       418     1287          814   600

                                   Table 7: Loading Rates

Organic Content
Table 9, Table 10 and Table 8 details the compares the loading rates for Nitrogen,
Phosphorus and organic material with particle size and land use. High organic content
was encountered in the urban area, however low loads from this sub catchment resulted
in low loading rates

  ORGANIC MATTER                kg/ha/yr               kg/ha/yr               kg/ha/yr
                            Sub 1200 Microns      Over 1200 Microns         All Particles

      Commercial                  30                        34                  64
        Urban                     8                         12                  19
        Base                      60                        67                  128
       Average                    33                        38                  70

                               Table 8: Organic loading Rates
Higher organic material loading rate was encountered at the base of the hill. Organic
matter has lower specific density and is more easily transported by wind and water to the
base of the catchment. Also organic material can chemically absorb to the surface of fine
particles.

It was expected because of the high organic matter loading rates there would the base
would have had the highest nitrogen loading.

Nitrogen loading rates were generally higher in the bed load and Gross pollutant loads




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