SuDS in London - a guide
sustainable-urban-drainage-november-2016
sustainable-urban-drainage-november-2016
You also want an ePaper? Increase the reach of your titles
YUMPU automatically turns print PDFs into web optimized ePapers that Google loves.
5.17 LuL depot roof, Middlesex<br />
Location<br />
Ruislip Depot<br />
Middlesex<br />
Extent<br />
125m²<br />
Cost<br />
£30,000 (Trial project)<br />
Date<br />
2012<br />
Credits<br />
<strong>London</strong> Underground Limited<br />
GLA<br />
University of East <strong>London</strong><br />
GRC<br />
<strong>SuDS</strong> components<br />
Green roofs<br />
After Installation<br />
Summary<br />
Retrofit green roof and monitor<strong>in</strong>g<br />
of source control.<br />
Project description<br />
A small-scale trial to evaluate the<br />
effectiveness of retrofitted green roofs,<br />
for LUL depot environments. From the<br />
results it will be decided whether LUL<br />
could benefit from a broader application.<br />
Objectives<br />
• Introduc<strong>in</strong>g environmentallyfriendly<br />
measures to address<br />
runoff from depot roof<br />
• Achieve low ma<strong>in</strong>tenance<br />
• Address Mayoral policy for <strong>SuDS</strong> by<br />
<strong>in</strong>stall<strong>in</strong>g a green roof source control<br />
• Ensure retrofitt<strong>in</strong>g on operational<br />
railway followed the rigorous<br />
assurance and safety procedures<br />
of <strong>London</strong> Underground, without<br />
<strong>in</strong>terruption of service<br />
Actions and results<br />
• Biodiverse extensive green roof<br />
types, each 18.5m x 3.3m, have been<br />
<strong>in</strong>stalled on a section of flat roof<br />
• One section (south) has a dra<strong>in</strong>age<br />
board with 65mm of extensive<br />
green roof substrate. The other<br />
section (north) uses recycled wool<br />
fibre <strong>in</strong>stead of dra<strong>in</strong>age board<br />
• Both roofs are vegetated with sedum<br />
cutt<strong>in</strong>gs and seeded/planted with<br />
annual and perennial wildflowers<br />
• The two trials are separated by an<br />
impermeable barrier to facilitate<br />
the measurement of runoff. Total<br />
saturated load<strong>in</strong>g is less than 100kg/m²<br />
• With the assistance of the University<br />
of East <strong>London</strong>, monitor<strong>in</strong>g devices<br />
have been <strong>in</strong>stalled <strong>in</strong> two downpipes<br />
of a green roof and two downpipes<br />
of a conventional control roof to<br />
measure water attenuation<br />
• GLA support has been provided<br />
through Dra<strong>in</strong> <strong>London</strong>. A small fund<br />
enables monitor<strong>in</strong>g performance<br />
109 5 Case studies
Change language