General Announcement

A webinar on manhole rehabilitation by Dr. Iain Naismith

ISTT Educational Webinar Series

Iain Naismith

Sewer Manhole Rehabilitation – quality assurance and comparison of techniques


 20 May 2021 Time: 14:00 GMT(15:00 BST) / 10:00 am US Eastern Daylight Saving Time (EDT)

The next ISTT educational webinar (available only to ISTT members) will be given by Dr.Iain Naismith and Dipl.-Ing. Markus Gillar, a senior research fellow at IKT (Germany).  Please sign up for the webinar from here.Register now

This webinar is organized by the ISTT Technology and Education Committee. ISTT plans more webinars in the coming months as our usual face-to-face meetings are on hold. All the past webinars (video/presentation file) are available on the ISTT member page. For any questions or requests, please contact


Title: Sewer Manhole Rehabilitation – quality assurance and comparison of techniques

Speaker: Dr. Iain Naismith and Dipl.-Ing. Markus Gillar – Senior Research Fellows at IKT – Institute for Underground Infrastructure (Germany).


This webinar highlights the lessons learned from 1:1 scale evaluation of the performance of technologies available for the rehabilitated of manholes, with a particular focus on sealing against groundwater infiltration.
The surcharging of sewer systems by groundwater impacts both their operation and that of the wastewater treatment works they connect to. Relining sewer pipes is part of the answer, but manhole shafts are also a significant pathway for infiltration.

This webinar explains the approach taken, at the request of German sewer network owners, to provide them with knowledge about the performance and limits of manhole rehabilitation technologies and what quality assurance issues they need to be aware of. It will also signpost attendees to where this information is publicly available.

It will cover:
• Sewer manhole functions and the issues associated with them
• How IKT went about examining rehabilitation, defining damage patterns and reviewing the market
• What was discovered about the performance of rehabilitation techniques
• Key issues for applying QA to installations


◆About : Dr. Iain Naismith
Dr Iain Naismith is a Senior Research Fellow at IKT with 35 years experience in environmental, water and sewerage related research. Based in the UK, he has a particular focus on international projects and knowledge sharing for this not-for-profit engineering research institute. He has been involved in the evaluation of performance of sewerage repair and rehabilitation products and products in contact with drinking water for some 20 years.

◆About : Dipl.-Ing. Markus Gillar
is a Senior Research Fellow and Project Manager at IKT. He led IKT’s two-year 1:1 scale evaluation project on the rehabilitation of sewer manholes and has subsequently run regular knowledge share training courses. He is currently managing a two-year evaluation of pressure sewer rehabilitation techniques and is developing IKT’s new ‘Heavy Rain’ laboratory that will examine the interaction between surface and underground drainage infrastructure.

Please sign up for the webinar from here.