Mount Alexander Shire Council – Stormwater Drainage Inventory & Condition Survey

To collect drainage inventory data to complement the existing stormwater drainage data in Council’s Asset Management System and determine the overall condition of the Stormwater drainage assets.


Stormwater Drainage Inventory & Condition Survey.

Purpose

To collect drainage inventory data to complement the existing stormwater drainage data in Council’s Asset Management System and determine the overall condition of the Stormwater drainage assets.

Objectives

To provide a drainage database that:

  • Meets the needs of all departments within Council
  • Is easy to use and maintain
  • Is compatible with Council’s corporate GIS system
  • Provides detailed information on the condition of the drainage network.

Scope of Services

The data collection was undertaken in the Castlemaine, Castlemaine West, Chewton, Campbell’s Creek and Maldon residential areas.

Specific Requirements

Council supplied digital township plans of the Castlemaine and surrounding residential areas, which show the approximate location of the known drainage network, including pits, pipes, end walls, gross pollutant baskets and traps etc.

All asset locations were verified and the requested inventory information was recorded.

The specification required the following tasks to be undertaken:

  • Carry out a physical inspection of each pit within roadways and easements (including private property) and each end-wall at road culverts, inlets and outfalls, to verify locations shown on the township plan
  • Identify and record any additional pits/drainage lines found that were not shown on the plans
  • Lift the pit lids and inspect the pits identifying size, type, construction material and condition
  • Allocate individual pit and pipe ID numbers
  • Identify pipes entering and exiting the pit including size (diameter), material type, invert depths, direction of flow, pit numbers of upstream/downstream pits and condition
  • For road culverts, inlets and outfalls, identify size, type and material of the end-walls and pipes as well as the direction of flow
  • Identify each retarding basin
  • Identify pits which could not be accessed
  • Identify each Gross Pollutant Trap or Side Entry Pit Bag
  • Report any damage or blockages in the drainage network
  • Upload data into a database for incorporation into Council’s GIS

Methodology

Pit locations were capture using differential GPS. Pits and pipes were linked and fully attributed using AssetMap software. Pit conditions were assessed using mobile camera technology.

Every pipe was fully investigated to ensure complete network coverage.

Deliverables

The project deliverables included:

  • Asset data in MapInfo table format in the projection/datum GDA 94/MGA94 Zone 55 to allow compatibility with Council’s GIS data
  • Asset images including unique asset photos
  • Final Survey Report in both hard copy and electronic format

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