Environmental Engineering Reference
In-Depth Information
Table 15.1 Site characteristics of the areas modelled using the MIRSED version of WEPP.
Site
Grid
Soil
Soil
Area
references 1
associations
types
modelled
(km) 2
Herefordshire
SO 500490-700490
734 Hollington, 150 Bromyard, 1124
Lugwardine, 415 Escrick.
Loam, Silty Loam,
Silty Clay Loam
75
Beds and Cambs
TL 050080-050520
707 Hanslope, 419 Evesham, 306
Denchworth, 1260 Moreton,
Clay, Clay Loam
112
1412 Oxpasture, 1702 Ragdale.
Dorset
SY 490905-640800
306 Denchworth, 160 Bearsted, 419
Evesham, 505 Fladbury,
Clay, Clay Loam,
Silty Loam,
59
425 Elmton, 1819 Sherborne, 1412
Oxpasture, 2227 Wickham,
Sandy Loam
258 Carstens, 101 Banbury,
Gwent
SO 450100-450000
150 Bromyard, 244 Crewe, 1237 Milford,
400 Eardiston,
Loam, Clay Loam,
Silty Loam
48
Kent
TR 245570-370510
705 Hamble, 237 Coombe, 1307
Newchurch.
Clay, Silty Loam
66
Norfolk east
TG 115400-115300
2225 Wick, 1310 Newport.
Sandy Loam
36
Nottinghamshire
SK 500585-700585
103 Bardsey, 1 Aberford, 282 Cuckney, 144
Bridgnorth,
Loam, Loamy Sand,
Silty Clay Loam
66
336 Delamere, 732 Hodnet, 2249
Worcester, 148 Brockhurst,
Shropshire
SJ 770000-SO770900
1310 Newport, 144 Bridgnorth, 226
Clifton, 1804 Salwick,
Loam, Sandy Loam,
Loamy Sand
48
149 Bromsgrove, 2225 Wick.
Somerset
ST 370180-4801150
419 Evesham, 1209 Martock, 505 Fladbury,
276 Curtisden,
Loam, Clay Loam,
Silty Clay Loam
57
2227 Wickham, 1891 South Petherton, 425
Elmton,
Staffordshire
SJ 860000-SO860800
226 Clifton, 149 Bromsgrove, 124
Blackwood, 1804 Salwick,
Loam, Sandy Loam,
Loamy Sand
88
1310 Newport, 642 Goldstone, 336
Delamere, 144 Bridgnorth,
Sussex west
TQ 380160-410010
2227 Wickham, 1006 Kingston, 306
Denchworth, 31 Andover,
Clay, Loam, Clay
Loam, Silty Loam
59
505 Fladbury, 237 Coombe, 1307
Newchurch, 2004 Upton, 2204 Wantage.
1 Represents flight path after Evans (1988)
2tha 1 year 1 ) were predicted for less than 3% of the
transect, even when extreme slopes are taken into account
with the use of slope distributions within the model.
The Nottinghamshire site illustrates the important
influence of land use upon estimated soil-loss rates.
Whereas slope gradients were as high as 25% and soil tex-
tures were identified as being potentially at risk (Morgan,
1985), much of the land was set-aside, pasture or rough
grassland, taken out of commercial production ensuring
that erosion rates were reasonably low. Certain areas
where winter cereals and root crops, such as sugar beet,
dominate experienced higher erosion, as is illustrated by
the fact that approximately 10% of the transect exceeds
the 1 t ha 1 year 1 threshold.
Average predicted erosion rates in theKent, Shropshire,
Somerset and Staffordshire sites rarely exceeded the nom-
inal soil-loss-tolerance rates. Maximum predicted rates
were higher, though extreme soil loss seems unlikely, as
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