7 Del. Admin. Code § 7103-67.0
Current through Register Vol. 28, No. 4, October 1, 2024
Section 7103-67.0 - Determination of Design Percolation Rates67.1 General 67.1.1 An important step in the design of a slow rate land treatment system is development of a "design percolation rate" from results of the site hydraulic conductivity evaluations. This value is used in water balance calculations to determine design wastewater loading(s(c) and thus spray field area requirements. The percolation rate is a function of soil permeability and site drainage.67.2 Design Values 67.2.1 The restrictive saturated hydraulic conductivity of each soil series must be identified. Any subsurface conditions which limit the vertical or lateral drainage of the soil profile must also be identified. Examples of such conditions are shallow impermeable strata, high water table and extremely anisotropic soil permeability. Values of saturated vertical hydraulic conductivity from soil testing are used to develop the design percolation rate.7 Del. Admin. Code § 7103-67.0