Changes

Throughout the construction process, it is sometimes necessary to deviate from the intended design of LID features and adapt the design to on-site conditions. The completion of a post-construction as-built survey is a standard operating procedure for engineering projects that captures any changes made to the feature’s design during construction.

Throughout the construction process, it is sometimes necessary to deviate from the intended design of LID features and adapt the design to on-site conditions. The completion of a post-construction as-built survey is a standard operating procedure for engineering projects that captures any changes made to the feature’s design during construction. For an example of municipal standards for as-built surveys, refer to the City of Toronto's [https://www.toronto.ca/wp-content/uploads/2017/11/98c7-ecs-specs-surveys-engsrv_survey_standards_for_consultant.pdf Engineering Survey Standards for Consultants]<ref>City of Toronto. 2021. Engineering Survey Standards for Consultants. https://www.toronto.ca/wp-content/uploads/2017/11/98c7-ecs-specs-surveys-engsrv_survey_standards_for_consultant.pdf</ref>

'''Survey Steps:'''

'''Survey Steps:'''

#If a pre-engineering survey is not available, use a reference feature as the datum.

#If a pre-engineering survey is not available, use a reference feature as the datum.

#Identify the type, diameter, and material of exposed utilities.

#Identify the type, diameter, and material of exposed utilities.

#Include data on critical feature elevations and existing utilities, such as:<ref>https://www.toronto.ca/wp-content/uploads/2017/11/98c7-ecs-specs-surveys-engsrv_survey_standards_for_consultant.pdf </ref>

#Include data on critical feature elevations and existing utilities, such as:

#*Inverts of newly installed pipe

#*Inverts of newly installed pipe

#*Vertical and horizontal bends in pipes

#*Vertical and horizontal bends in pipes