WEDC Technical Brief No. 57: Surface water drainage - How evaluation can improve performance.

<p dir="ltr">This Technical Brief outlines ways in which, by carrying out a simple evaluation, engineers and technicians can make improvements in the performance of drainage systems.</p><p dir="ltr">Urban drainage is the removal of unwanted water from cities and large towns. When it rains, part of the rainwater, called <i>runoff</i>, runs off the surface and flows along the ground. Surface water drainage removes this runoff.</p>