Gravelless drainfield piping.
El Paso City Code § 18.21.290
in effect18.21.290 - Gravelless drainfield piping.
A. Appropriateness. Gravelless pipe may be used in place of conventional gravel-filled trench systems.
B. Physical Description. Gravelless pipe generally consists of eight-inch or ten-inch diameter corrugated polyethylene pipe having two rows of perforations located approximately one hundred twenty degrees apart along the pipe's bottom half. The pipe is enclosed in a layer of spunbonded nylon filter wrap. Pipe shall meet American Society for Testing and Materials, ASTM F-667 Standard Specifications, for large diameter corrugated high density polyethylene (ASTM D 1248) tubing. Perforations shall be one-half-inch diameter in ten-inch diameter pipe and three-eighths-inch diameter in eight-inch diameter pipe. Perforations shall be arranged and spaced so that only one hole exists in each inner corrugation. The filter cloth must meet ASTM D 3776 and ASTM D 1682 specifications for weight and grab strength. Its burst strength and air permeability must meet ASTM D 3786 and ASTM D 737 specifications, respectively. Installations must be in accordance with the pipe manufacturer's instructions. However, the system installer is cautioned against surrounding the pipe with native soils having percolation rates slower than thirty minutes per inch or laden with very fine soil particles that might plug the filter wrap.
C. Design Parameters. The design of an absorption bed, absorption trench, or evapotranspiration disposal field utilizing this product shall be based upon the same parameters that are used in the design of more conventional systems.
(Ord. 9448 (part), 1988)
Source: City of El Paso, City Code and City Charter (Municode Library, library.municode.com)URL: https://library.municode.com/tx/el_paso/codes/code_of_ordinances?nodeId=TIT18BUCO_CH18.21PRSEFA_ARTVIDESTEFDISY_18.21.290GRDRPIFetched: 10/28/2026