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River Quality

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River Quality RIVER QUALITY October 1992 - September 1993 Susan Wattam Assistant Scientist Scientific Department November 1993 Telephone: (0734) 535422 ENVIRONMENT AGENCY 042725 CIRCULATION LIST Mr P Lloyd, Acting Environmental Services Manager (South-East) Mr J Haines, Environmental Services Manager (West) Mr B Walker, Acting Environmental Services Manager (North-East) Mr P Greaves, Senior Pollution Officer____ el jSoU utiolT^fe^fficer / Mrs J Kinniburgh, Principal Quality Planner Mr J Eastwood, Principal Scientist Quality Regulation Dr R Sweeting, Regional Scientist Dr J Banks, Fisheries & Conservation Manager QUARTERLY RIVER QUALITY REPORT (Period: October 1992 - September 1993) - River Quality Objectives 3820 km of watercourses in the Thames region have river quality objectives and achievement against these objectives is assessed using 1 year’s chemical data. Table I shows the reaches which have failed their quality objectives for the year to September 1993. This period has seen the number of reaches failing their quality objectives fall to a new low. Only 30 reaches failed to meet their objectives, which represents 176 km of watercourse of 4.6% of the total length of watercourses assessed. Table la shows the number of reaches which failed their quality objectives, and the corresponding percentage length of watercourses assessed, over the past 15 months. Table 2a is a matrix showing the total length of river in each class against objectives. Table 2b shows the total lengths of river meeting their quality objectives. EC Freshwater Fish Directive (78/559/EEC) A total length of 1470 km of freshwater river is designated under the EC Freshwater Fish Directive. Of this, 504 km is designated as salmonid and 966 km is designated as cyprinid. 173 sites are used to assess compliance against the water quality standards set in the directive. II sites failed to comply with the standards during the period 1 October 1992 to 30 September 1993 (see table 3). There has been a net increase of 2 sites since the last report (1 salmonid site entered the list and 3 left, whilst 5 cyprinid sites entered the list and 1 left). EC Dangerous Substances Directive (76/464/EEC) 7 sites have failed the standards as set in the EC Dangerous Substances Directive (see table 4). Two new sites (1 in the river Wandle and the other in the river Lee) have been added to the list and both these failures are for total HCH. The Tideway Table 5 shows the achievements of the 3 tideway reaches against their quality objectives and fig. 5a shows the dissolved oxygen profile for the period July - September 1993. During the period July - September 1993 there were numerous outbreaks of rain which caused storm sewage inputs into the tideway and resulted in reduced water quality, but 2 notable incidents occurred. Firstly, after heavy rain on 11 August massive amounts of storm sewage entered the tideway. The "Thames Bubbler" was deployed as a preemptive measure and as a result dissolved oxygen (DO) levels did not fall below 50% saturation. Secondly, very heavy rain occurred on 7/8 September (rainfall was greater than 30 mm in some parts of the region). This time the "Thames Bubbler” was not deployed and DO levels fell to 27%. Also during the Salmon freshet experiment come into operation. The aim of this scheme is to increase the freshwater flows entering the tideway, by reducing the amount abstracted, to assist the salmon run up the Thames. The result of this scheme was that whenever it was in operation more freshwater entered the tideway and this improved the water quality. DO levels were usually at least 60% saturation in the upper tideway. Throughout the period the middle tideway has been satisfactory. DO levels have ranged between 30 and 50% saturation as a result of the influences of storm sewage inputs and various extreme spring tide cycles. 3 sites on the tideway failed the standards as set in the Dangerous Substances Directive. There has been a net decrease of 1 site since the last report and now all of these failures are for total HCH (see table 6). Table I R I ^ R Q ^ - Reaches Failing Their Quality Objectives ;s\ 1 October 1992 - 30 September 1993 RIVER Reach Length (km) Sample Point RQO Class Class Determining Achieved Failing Dets. BLACK DITCH Old Railway to Kingsey Cuttle 1.900 BLACK DITCH AT A4129 IB 2A BOD BOURNE (BERKS) Chapel Row to Pang 7.600 BOURNE (BERKS) ABOVE PANG 1A IB DO/AmN BURCHFIELD BROOK Burghfleld Cmn, to Foudry Brook 6.860 BURGHFIELD BROOK ABOVE FOUDRY 1A IB BOD/DO DENTON BROOK Source to Cuddesdon STW 1.470 DENTON BROOK AT DENTON IB 2A AmN ENBORNE Baughurst Brook to Kennet 6.050 ENBORNE, BRIMPTON GS 1A IB DO FILCHAMPSTEAD BROOK Dean Court to Thame* 2.200 FILCHAMPSTEAD BK US THAMES IB 2A BOD HARCOURT BROOK Stantn Harcourt to Limb Brook 2.870 HARCOURT BROOK ABOVE LIMB BRO IB 2A DO KENNET AND AVON CANAL Croftn (Summit) to Kintbury 19.470 K & A CNL, FROXFIELD BR 1A 2A BOD KENNET AND AVON CANAL Woolhampton to Ufton 4.450 K&ACNL, UFTON BR 1A IB BOD LERTWELL BROOK Ashbury to Tuckmill Brook 2.050 LERTWELL BROOK 150M BELOW ZUL IB 2A BOD/AmN LYDIARD BROOK Source to Rod bourne Tip 3.700 LYDIARD BK DS STW LYDIARD MLCT 1A 2A AmN OCK Longcot to Stnford itv STW 12.450 OCK, STANFORD-IN-THE-VALE BR 1A IB AmN PADWORTH STREAM Old Warren to Kennet 5.720 PADWORTH STREAM AT BRIDGE 386,. 1A IB BOD SUMMERSTOWN DITCH Summentown to Cutters Brook 2.380 SUMMERSTOWN DITCH 100M BELOW 2B 3 BOD/DO/UiA SWILL BROOK West CrudweU to Flagh&m Brook 9.980 SWILL BROOK AT OAKSEY LANE 1A IB DO SWILL BROOK Flaghom Brook to Thames 3.620 SWILL BK, PIKE CNR ASHTON KYNS 1A IB DO THAMES Kennet to Loddon 7.910 THAMES, SONNINO WEIR IB 2A BOD THAMES Cut to Bovcncy Weir 3.810 THAMES, BOVENEY IB 2A BOD WHEATLEY DITCH Wheatley STW to Thame 0.260 WHEATLEY DITCH AT SUPERSTORE C 2B 3 BOD/DO/UiA WOODHILL BROOK Stockham Bridge to Childrey Brook 2.500 WOODHILL BROOK ABOVE CHILDREY IB 3 BOD | BOURNE (SOUTH) West End Common to Bourne 22.200 BOURNE S, MIMBRIDGE CHOBHAM IB 2A AmN VYNE STREAM Sherborne St.Jn to Bow Brook 4.160 VYNE STR DS VYNE LAKE IB 2A BOD i Table 1 •■ w .% v.w AA^.w .w .v<v^w vv.w i.Vi% y..v.S ¥.,.*.yi‘<si.,.w .|.v<*iV«y^’.w .‘i»»v<y^vs *, ,? <* s > ■ < ^v<> <• / / ^ a a ^ ✓ «v '.«• i < ' ' **v» ss a ■•** w ^ n > %w> v iv r w s RIVER QU^ITY ASSESSMENT - Reaches Failing Their Quality Objectives / j || 1 October 1992 - 30 September 1993 RIVER Reach Length (km) Sample Point RQO Class Class Determining Achieved Failing Dets. i p r a i S S f m m i BULBOURNE Northchurch to Gade 9.700 BULBOURNE US GADE 1A IB AmN CATHERINE BOURNE Shenley STW to Mimmshall Brook 3.250 CATHERINE BRN, RABLEY PK 1A 2B AmN/UiA OADE Bulboume to Gade Avenue SWO 11.320 GADE/GUC, HUNTON BR 1A IB BOD GUC (BATCHWORTH REACH Source to Colne 2.170 GUC US SPRING WELL LOCK IB 2A BOD GUC (CROXLEY REACH) Source to Gade 1.970 GUC AT LOT MEAD LOCK IB 2A BOD GUC (PDC FARM REACH) Source to Berkhamsted STW 1.730 GUC US BERKHAMSTED STW IB 2A BOD M1SB0URNE Lttle Missenden to Bury End Arm 6.260 MISBOURNE, LTL MISSENDEN 1A IB DO VER Dolittle Mill to Sopwell St. Alb 9.030 VER, GORHAMBURY 1A IB DO Table la RIVER QUALITY ASSESSMENT June 1992 - September 1993 Failed To Meet Objective No. Reaches l l l l l % Total Length of Rivers Period Table 2 RIVER QUALITY ASSESSMENT - Rivet Thames 1 October 1992 - 30 September 1993 Length Class RIVER Reach (km) Sample Point RQO Achieved THAMES Source to Swill Brook 11.150 THAMES, SOMERFORD KEYNES BR IB 1A THAMES Swill Brook to Cemey Wick Bk 3.550 THAMES, WATERHAY BR ASHTON IB 1A THAMES Ccrney Wick Bk to Key 3.950 THAMES, CRICKLADE IB IB THAMES Key to Ray 1.450 THAMES AT EYSEY IB IB THAMES Ray to Share Ditch 7.350 THAMES, CASTLE EATON 2A IB THAMES Share Ditch to Bydemill Brook 3.820 THAMES, HANNINGTON BR 2A IB THAMES Bydemill Brook to Coin 2.870 THAMES, INGLES HAM 2A IB THAMES Coin to Shifford Weir 22.530 THAMES, BUSCOT INTAKE 2A 1A THAMES Shifford Weir to Bablock Hythe 12.410 THAMES, NEWBRIDGE IB 1A THAMES Bablock Hythe to Evenlode 7.970 THAMES, FARMOOR INTAKE IB IB THAMES Evenlode to Castle Mill Str 9.270 THAMES, TROUT INN GODSTOW IB 1A THAMES Castle Mill Str to Cherwell 1.360 THAMES, FOLLY BR OXFORD IB 1A THAMES Cherwcll to Sandford Lock 4.410 THAMES, DONNINGTON BR OXFOR 2A IA THAMES Sandford Lock to Ock 8.510 THAMES, RADLEY COLLEGE 2A 2A THAMES Ock to Thame 15.240 THAMES, DAYS LOCK IB IB THAMES Thame to Goring STW 14.230 THAMES, WALLINGFORD BR IB IB THAMES Goring STW to Whitchurch STW 8.500 THAMES US GORING WEIR IB IB THAMES Whitchurch STW to Kennet 12.590 THAMES, CAVERSHAM WEIR IB IB THAMES Kennet to Loddon 7.910 THAMES, SONNING WEIR IB 2A THAMES Loddon to Fawley Ct Str 7.590 THAMES, HENLEY BR IB IB THAMES Fawley Ct Str to Cut 27.230 THAMES, COOKHAM BR IB IB THAMES Cut to Boveney Weir 3.810 THAMES, BOVENEY IB 2A THAMES Boveney Weir to Romney Lock Cut 4.290 THAMES 400M DS BOVENEY DT IB 1A THAMES Romney Lock Cut to Windsor STW 5.770 THAMES, SUNNYMEADS INTAKE IB 1A THAMES Windsor STW to Wey 16.040 THAMES, NSWC INTAKE CHERTSE IB 1A THAMES Wey to Mole 10.530 THAMES, MWD WALTON INTAKE IB 1A THAMES Mole to Hogsmill 4.010 THAMES US RAVENS AIT SURBITO IB 1A THAMES Hogsmill to Teddington 2.700 THAMES, TEDDINGTON WEIR 2A IB TableJ i ................................................................
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