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Evaluation of the Impact of Sediment on Breeding Salmonids Across

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Evaluation of the Impact of Sediment on Breeding Salmonids Across DE Ops South EST East Okement- A30 Road Bridge (SX 600 946) Geographical Information Westdown Camp Tilshead Analysis of the Trout fry and parr data over a ten year period on the East and West Okement watercourses show a very 140 y t Wiltshire stable and consistent level of population close to where the waters come off the training area. i s 120 SP3 4RS Numbers of fish typically range between 9 and 22 parr per 100 square metres of watercourse. n e 100 ) D Trout Parr These figures are considered to indicate a healthy level of population with no evidence of catastrophic pollution incidents. 2 t u m 80 Trout Fry o 0 r East Okement River 0 Evaluation of the T 1 / 60 Salmon Parr ( n o Salmon Fry ± 40 impact of sediment m l a 20 S on breeding Salmonids 0 1995 1998 2002 2003 2005 2006 across Year Dartmoor Training Area Project No 25_09_07 Date 16/10/07 West Okement- Okehampton Castle (SX 585 943) Scale Not to a Specific Scale 140 This map is reproduced from Ordnance Survey material with the y t i permission of Ordnance Survey on behalf of the Controller of s 120 Her Majesty’s Stationery Office © Crown copyright. Unauthorised n e 100 reproduction infringes Crown copyright and may lead to prosecution ) D Trout Parr or civil proceedings. Defence Estates, Lic. No. 10003250, 2007 2 t © Crown copyright. All rights reserved Defence Estates u m 80 Trout Fry o 0 r 0 T 1 60 Salmon Parr / ( n This map has been used to bring together sediment o 40 Salmon Fry m source and breeding Salmonid data to evaluate l a 20 potential trends or effects. Defence Estates is most S The North Teign River which might be expected to be primarily grateful for the Salmonid data provided by the Devon 0 affected by silt from the eroding peat has consistent numbers 1995 1998 2002 2003 2004 2006 and Cornwall Environment Agency Fishery Departs of trout in the 6 to 16 parr per 100 square metres over the last and Blanket Bog Erosion data provided by Dartmoor Year West Okement River ten years. ESA Officer. North Teign - Leigh House (SX 683 879) 140 y t i s 120 n e 100 Trout Parr D ) 2 t u 80 m Trout Fry o 0 r 0 T 1 / 60 Salmon Parr ( n o 40 Salmon Fry m l a 20 S 0 1996 1999 2002 2003 2004 2005 2006 Year The Willsworthy Brook which feeds into the Tavy supports higher numbers of juvenile trout than the Okement, with counts consistently up to 30 to 60 per 100 square metres of watercourse and smaller numbers but healthy counts of Salmon. Tavy - Willsworthy Brook (SX 534 817) y 140 t i s 120 n e Trout Parr D ) 100 2 t u m 80 Trout Fry o 0 r 0 T 60 1 / Salmon Parr ( n o 40 Salmon Fry m l 20 a S 0 1995 1996 1997 1998 1999 2000 2002 2003 2004 2005 2006 Year Tavy - Hill Bridge (SX 539 816) The River Tavy could also be affected by silt from the eroding peat but there is no physical y 140 t i evidence to support this. s 120 n e Trout Parr D ) 100 t 2 u m 80 Trout Fry o 0 r 0 T 60 / 1 Salmon Parr ( n Watercourses o 40 Salmon Fry m l 20 a Roads/Tracks S 0 1995 1996 1997 1998 1999 2000 2002 2003 2004 2005 2006 Training Area Extent Year Erosion of Blanket Bog.
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