HYDROLOGICAL MODEL FOR DRAINAGE THROUGH PIPE TRENCHES

HYDROLOGISK MODELL - DRAENERING GENOM LEDNINGSGRAVAR

Two hydrological models were studied with regard to the drainage function of pipes and trenches in cases when the pipes are laid beneath the water table with clay seals placed around the pipes at regular intervals to prevent drainage along the backfill. In one of the models the pipe trench cut through only clay layers, while in the other model underlying silt layers were also penetrated. The results of observations related to ground water table and fissure water level were evaluated. The general conclusion which can be drawn is that sewers can be bedded in sand without this giving rise to appreciable drainage effects. The total influence of the secondary drainage is of a magnitude much smaller than the maximum leakage into the pipe permitted by the current Swedish code over a distance as short as that between two manholes. /TRRL/

• Corporate Authors:

  National Swedish Institute for Building Research

  Box 27 163, 102 52
  Stockholm,   Sweden 
• Authors:
  • Carlstedt, B
• Publication Date: 1975

Language

• Swedish

Media Info

• Features: Figures; References;
• Pagination: 50 p.

Subject/Index Terms

• TRT Terms: Bedding; Clay; Cracking; Drainage; Drawdown; Groundwater; Hydrology; Leakage; Lowering; Mathematical models; Pipe; Pits; Sand; Sealing (Technology); Sewers; Silts; Trenches; Water table
• Uncontrolled Terms: Models
• Old TRIS Terms: Bedding /sewers/; Sealing
• ITRD Terms: 2937: Drainage; 5702: Excavation pit; 4332: Hydrology; 4395: Lowering (water table); 6473: Mathematical model; 3361: Pipe
• Subject Areas: Geotechnology; Highways; Hydraulics and Hydrology; I26: Water Run-off - Freeze-thaw; I41: General Soil Surveys;

Filing Info

• Accession Number: 00137550
• Record Type: Publication
• Source Agency: Swedish National Road and Transport Research Institute (VTI)
• Report/Paper Numbers: R37:1975
• Files: ITRD, TRIS
• Created Date: Oct 26 1976 12:00AM