Trench Drain Design RequestTECHNICAL SUPPORT

 

ACO Polycrete Pty Ltd provides a free complimentary service to assist the correct design and choice of trench drainage. This service is available for all ACO brands which incorporates trench drain design.

The sections below will guide you through this service for ACO Drain inquiries.


 

 

   Trench Hydraulics - Project specific flow calculations to ensure correct sizing of trenches

TO REQUEST THIS SERVICE, CLICK HERE

hydraulic design program‘Hydro’ is a purpose written, hydraulic design program modelled on differential calculus for non-uniform flow in open channels. The program was further refined with empirical data, following a series of experiments modelling lateral intake into trenches. Analysis of the effect of slope, run length, and trench cross sectional profiles were incorporated into the program.

Complex scenarios such as the effects of water inflow from downpipes or inlets along the length of the trench can also be modelled by the ‘Hydro’ program. ACO can use ‘Hydro’ to recommend optimum outlet positions along trench runs.

To generate results from the ‘Hydro’ program, the following information is required:

  • Length of trench run (metres)
  • Length and width of catchment area (metres)
  • Surrounding pavement/surface type, e.g., concrete, asphalt, etc.
  • Rainfall intensity (mm/hr)
  • Ground fall along trench (%)
  • Perpendicular approach slopes to trench (%)
  • Preferred position of outlets along trench and any outlet size restrictions
  • Any slab depth restrictions

Results are provided either electronically (PDF) and/or in printout format.

'Hydro' plot shows:

1 Position and size
of minimum 'freeboard' (gap between the underside of grate and the top of liquid in trench).
 
2 The hydraulic profile of the liquid
 
3 Flow velocity and flow rate at all points along the trench
 
4 Discharge flowrate
capacity of the channel run. (14.75 l/s from example below)
 
5 Hydraulic utilisation of trench (%) is given. If over 100% flooding occurs. (71.35% from example below)
hydraulic calculator for ACO Drain channel systems

   Grate Hydraulics - Project specific grate intake calculations to provide grate catchment data

TO REQUEST THIS SERVICE, CLICK HERE

Grating Intake CalculatorACO has independently measured, by experimentation, the hydraulic intake capacities of ACO Drain grates. Tests were carried out under varying flow rates and catchment approach slopes. To determine the hydraulic utilisation, each grate was tested until bypass occurred (point at which liquids would pass across grate).

The Grating Intake Calculator (GIC) provides information on the intake efficiency of the chosen grate. If the required liquid intake is greater than the grate’s performance, the extent of bypass (or failure) will be calculated. (click here for more info)

To generate results from the ‘GIC’ program the following information is required:

  • Length of trench run (metres)
  • Length and width of catchment area (metres)
  • Position of trench in catchment area
  • Surrounding pavement/surface type, e.g., concrete, asphalt, etc.
  • Rainfall intensity (mm/hr)
  • Perpendicular approach slopes to trench (%)
  • Preferred grate type

Results are provided either electronically (PDF) and/or in printout format.

'GIC' plots shows:

1 Catchment
geometry and
hydraulics
  2 Head of water
approaching
grate
 
3 Additional notes relating to grate performance
  4 Recommended
grate information
  5 Total intake
area per metre of
trench run
 
6 Hydraulic utilisation of grate (100% means all grate intake capacity is used)
Grating Intake Calculation

 

   Run Layout Scheduling - Plan and profile layouts complete with bill of materials

TO REQUEST THIS SERVICE, CLICK HERE

CAD design serviceCAD Design Service

ACO can provide a cost-effective surface drainage solution to satisfy a project’s design requirements. Trench drain layouts will be designed to take full advantage of existing and proposed site grades, utilising existing services where possible.

In order to produce a plan layout, the following information is required:

  • Plan of site showing elevations
  • Existence of any depth restrictions
  • Position and type of any plumbing fixtures/outlets
  • Position of any permanent structures
  • Liquid flow pattern and type of traffic (including traffic flow)


Results provided are:

  • Plan layouts (CAD) showing the trench drain positions relative to site structures
  • Installation drawings and specifications

CAD printout provides:

1 Plan view of
trench run
layout
  2 Liquid flow
directions
  3 Position and
type of outlet
  4 Trench and
grate type
run layout
run layout

ACO Scheduler

ACO has written a proprietary software program, ‘Scheduler’, that shows trench drain runs in profile. The program automatically plots each run showing positions of accessories, outlets, junctions, etc. It automatically calculates a ‘Bill of Materials’ for each run and totals multiple runs to ensure the correct amount of parts and pieces are ordered. ‘Scheduler’ plots are particularly useful for installers.

Results (CAD) provided are:

  • Sectioned profile of trench runs
  • Parts schedule fully itemising parts and pieces

run layout

'Scheduler' plot provides:

1 Profile view of trench run
 
2 Direction change - e.g., 90o corner or junction
 
3 Positions and types of outlets
 
4 Detailed Bill of Materials to ensure all parts are correctly
ordered
run layout
run layout

 

 

   Ponding Analysis - Risk analysis of flood situations, including estimated flood size and duration

TO REQUEST THIS SERVICE, CLICK HERE

ponding analysisTemporary ponding is a short lived flood situation, which, in some circumstances, can be tolerated allowing an intentionally undersized trench drain system. It allows a more economical system to be used that will work effectively under most weather conditions, but will be slightly under designed for heavy storms.

Ponding analysis should only be considered where buildings and property are not in close proximity to the drainage system to minimise risk of damage. It is an ideal option for the outer areas of large parking lots, distribution yards, etc., (Risk Analysis).

The ponding analysis map shows the size and duration of the flood.

In order to produce a ponding analysis, the following information is required:

  • Full information required to run the 'Hydro' plot (see 'Trench Hydraulics' above)
  • Plan of site showing elevations
  • Existence of any buildings
  • Perpendicular approach slopes to trench (%)

Results provided are:

  • Plot showing extent of ponding: width and depth

Ponding analysis shows:

1 Design
discharge
  2 Trench drain
size and type
  3 Run-off scenario   4 Width of
temporary
ponding
  5 Visual map of
worst ponding
scenario
  6 Project notes
Ponding analysis


 

To download a pdf of ACO’s services, click here