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A27 Westhampnett By-pass, Chichester: Hydrogeological study. Final Report

Topics: Earth Sciences
Publisher: Institute of Hydrology
Year: 1989
OAI identifier:

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  1. (1977). 1.6.2 Rainfall Rainfall records are available from several locations in the general area (see Figure 1.1). The nearest locations are Tangmere
  2. (1986). 2.3.2 Period from 1986 Figure 2.1 shows an interpretation of the changes in pit water levels from
  3. (1969). 70 the water levels in Chtirch Farm Pit varied from about 95 to I 1m OD following a winter of below average rainfalL Th ese were about 3m lower than those observed in 1974/5 and about 45 m lower than during the 1980's.
  4. (1974). abou t 21 ha. A change in water level of one metre therefore represents about 210000 rn3. The water level rise during
  5. (1966). Area and Geology 1.2 Annual Total Rainfall at Chichester,
  6. (1975). as might have otherwise occurred since high fl ows on the R. Lavant continued until March/April
  7. (1976). Authority
  8. (1983). Coach Lane Pit (Pit 2), and Shopwyke North Pit (Pit 3) and other pits further south (Pits 4 to 7). The
  9. (1987). decreased to 0.57 and 0.34 cumecs in February and March before increasing in April due to exceptional rainfall
  10. (1975). er the very wet conditions of September and
  11. (1987). Flooding was reported in the vehicle park area in April/May
  12. (1968). Flow observ ed Feb .Jul 19 70 LL2 ' g Records start 117tt 2-0 NR No record o 2 I 13 .e; 71. too t 0 49. 70 Pit Water Levels,R.Lavant flow and Winter Rainfall
  13. (1982). Geological notes and local details for 1:10000
  14. (1987). Geotechnical Consulting Engineers
  15. increase at the edge of the basin x/L = 0.5 and from plots of il l. against hS/Wt for values of n, then hS/Wt 0.05 and the head increase at x/L is:
  16. Lane Pit SWA Pit 2 . This pit east of Coach Lane was formerly owned by Hall and Company and was partly infilled with domestic and other waste by the Chichester District Council star ting in 1975. FUrther infi lling is presently taking place .
  17. (1987). Lavant commence d again in
  18. (1975). levels were monitored by SWA between June and
  19. (1983). of Geologj cal Sciences
  20. (1987). Pi t (with the present ground level). The culvert in the 19 south-eastern corner would have protected the road entrance since water could escape directly into Shopwyke North Pit. However, this is no longer the case as this culvert was blocked of in
  21. (1986). Pit over the same period. In
  22. (1969). Pit water levels have been monitored by SWA from
  23. records include Church Farm Pit (Pit 1) the Sainsbury Pit and Pound Farm Pit, the two latter pits having apparently been open at this time. The 1974/5
  24. since about 1983/4, when the Pulverisation Plant ceased operat ions. - since peak water levels in the past have been controlled by pumping, it is likely that these could reach higher elevations during a wet year without some form of control.
  25. (1988). Sussex Division doi
  26. the Church Farm Pit. Th e rise in minimum water level between 1975 and 1986 appears to be about 1m, which is similar to that of the Church Farm
  27. (1975). The data for 1975/6 have been used to est imate the rate of outfl ow from the Church Farm Pit. The water level declined by 1.9m from about 13.6m OD
  28. The dry winter and summer of 1989 will have resulted in low water levels, possibly close to those of 1976. A visual estimate made
  29. (1983). The geological succession is given in Table 1.2 and the geology of the area is shown in Figure 1.1 (from IMA U
  30. (1987). The highest water level observed was about 15.5m in
  31. (1970). The seasonal rise in water level in
  32. (1988). the water level in
  33. (1974). The water level information for
  34. (1983). The water level record for 1983 began in early January with a recorded level of 15.1m OD declining to 14.8m OD in
  35. (1974). The water level record for Pit 1 for 1974/5 began in
  36. (1983). The winter of 198213 was very wet (124% of average). Flow began on the R.Lavant in November 1983, although high fl ows did not begin until December
  37. (1986). There was signifi cant rainfall in November and
  38. (1983). Two samples of waste material were collected in
  39. (1975). Water Authority
  40. (1976). water level elevations averaging about l l m OD were observed in fi ve boreholes drilled by SWA at the Pulverisation Plant. The pit water level was 11.7m in
  41. wet years, such as the winter of 1974/5, the difference in water level between Church Farm Pit and Shopwyke North Pit increases to about 1.5m but during dry periods the water level dif erence is more typically about 0.5m.

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