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 />
Feature &<br />
ATTRIBUTE /<br />
SERVICE<br />
Flood Risk<br />
Floodplain:<br />
Conveyance of<br />
flood flows<br />
Quality<br />
Indicator<br />
Surface <strong>water</strong>s<br />
Ground<strong>water</strong><br />
Scale 1 , Details <strong>and</strong><br />
Grading<br />
Regional / Local:<br />
Proposed Development<br />
within River Avon <strong>and</strong><br />
Clay Coton Yelvertoft<br />
Brook 1:100 year<br />
indicative floodplain<br />
Local: Alluvial <strong>and</strong> river<br />
terrace gravel deposits<br />
with <strong>water</strong> table in places<br />
Importance Potential Impact Magnitude<br />
without<br />
Mitigation<br />
Medium<br />
Medium<br />
Potential increase in flood peak<br />
due to construction within flood<br />
plain<br />
Change in road runoff rates<br />
Residual loss of deposits during<br />
construction phase<br />
Minor<br />
adverse<br />
Minor<br />
adverse<br />
Magnitude<br />
with<br />
Mitigation<br />
(Negligible)<br />
Minor<br />
beneficial<br />
Significance<br />
of Effect<br />
(Neutral)<br />
Negligible Negligible Neutral<br />
Slight beneficial<br />
below 1m<br />
Local: Clay soils Low None (Negligible) (Negligible) (Neutral)<br />
1 Assume that quality <strong>and</strong> rarity of <strong>the</strong> same grading <strong>and</strong> that all features of limited substitutability<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 44
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