From: Grant Leggett [grantleggett@boyerplanning.co.uk]
Sent: 27 October 2011 08:32
To: Rose, Charles
Cc: Sexton, Gavin
Subject: RE: Elsworthy Road

Dear Gavin,

Further to my email yesterday, we have calculated the impacts of reducing the green roof area. Based on an approx 100 year return period storm:

· Reduced area of green roof results in surface water discharge increasing from 2.2 to 2.33l/s

· Therefore total combined discharge from site (including 1.5l/s foul flow) increases from 3.7 to 3.83l/s

· New discharge rate represents an increase of less than 4%.

I trust you will agree that the very minor increase in runoff (still well below existing) remains acceptable, and you would like us to proceed with final drawings of the revised roof design?

Regards,

Grant Leggett
Associate Director
London

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