Chapter 9: Road drainage and the water environment
Chapter 9: Road drainage and the water environment
Chapter 9: Road drainage and the water environment
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M1 JUNCTION 19 IMPROVEMENT<br />
ENVIRONMENTAL STATEMENT VOLUME 2<br />
CHAPTER 9 – ROAD DRAINAGE AND THE WATER ENVIRONMENT<br />
Table 9.13 M1 Junction 19 Water Environment Features Summary: Operation Effects<br />
Feature &<br />
ATTRIBUTE /<br />
SERVICE<br />
Surface Water<br />
River:<br />
Water supply<br />
Transport &<br />
dilution of waste<br />
products<br />
River:<br />
Biodiversity<br />
Quality<br />
Indicator<br />
Chemical <strong>water</strong><br />
quality<br />
Non potable<br />
abstraction<br />
Drinking <strong>water</strong><br />
supply<br />
Biological<br />
<strong>water</strong> quality<br />
Scale 1 , Details <strong>and</strong><br />
Grading<br />
Regional / Local: River<br />
Avon RE1<br />
Regional / Local: Clay<br />
Coton Yelvertoft Brook<br />
RE2<br />
Local: Status of o<strong>the</strong>r<br />
<strong>water</strong> courses not<br />
recorded<br />
Local: No abstractions<br />
within 2 km downstream:<br />
National / Regional: River<br />
Avon drinking <strong>water</strong><br />
supply downstream of<br />
development, assumed<br />
DW3 <strong>and</strong> within critical<br />
travel time<br />
Regional / Local: River<br />
Avon GQA C (monitored<br />
downstream of site)<br />
Importance Potential Impact Magnitude<br />
without<br />
Mitigation<br />
Magnitude<br />
with<br />
Mitigation<br />
Very High Increased routine runoff to<br />
<strong>water</strong>courses. Pollutant<br />
Negligible Minor<br />
beneficial<br />
High concentrations within acceptable Negligible Minor<br />
limits. Slight increase in pollution<br />
beneficial<br />
incident risk. The introduction of<br />
(assumed) treatment ponds <strong>and</strong> o<strong>the</strong>r Negligible Minor<br />
Medium - pollution prevention measures<br />
beneficial<br />
Low<br />
offer an improvement in <strong>the</strong> quality<br />
of discharges to receiving <strong>water</strong>s,<br />
compared with <strong>the</strong> do minimum<br />
scenario.<br />
Significance<br />
of Effect<br />
Moderate<br />
beneficial<br />
Slight beneficial<br />
Slight beneficial<br />
Low None (Negligible) (Negligible) (Neutral)<br />
High<br />
Medium<br />
Increased routine runoff to<br />
<strong>water</strong>courses. Pollutant<br />
concentrations within acceptable<br />
limits. Slight increase in pollution<br />
incident risk. The introduction of<br />
treatment ponds <strong>and</strong> o<strong>the</strong>r<br />
pollution prevention measures<br />
offer an improvement in <strong>the</strong> quality<br />
of discharges to receiving <strong>water</strong>s,<br />
compared with <strong>the</strong> do minimum<br />
scenario.<br />
Increased routine runoff to<br />
<strong>water</strong>courses. Pollutant<br />
concentrations within acceptable<br />
Negligible<br />
Negligible<br />
Minor<br />
beneficial<br />
Minor<br />
beneficial<br />
Slight beneficial<br />
Slight beneficial<br />
B0531000_ID_70-EIA Vol 2 Chap 9 <strong>Road</strong> Drainage <strong>and</strong> <strong>the</strong> Water Environment Final Rev 4.doc Page 41
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