OPW16/0021- Operational Works Application 2 of 4

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What%to%look%for%                     Performance%Indicator%(PI)%          Condition%Rating*%   Maintenance%Undertaken**%   Additional%Work%Needed%
SURROUNDS%
                                      No!damage!that!poses!a!risk!to!
Damaged%or%removed%
                                      public!safety!or!structural!         !                    !                           !
structures%(e.g.!traffic!bollards)!
                                      integrity!
INLET%
                                      Inlet!is!structurally!sound!and!
Erosion%                              there!is!no!evidence!of!erosion!     !                    !                           !
                                      or!subsidence!/!settlement!
                                      No!damage!that!poses!a!risk!to!
Damaged%or%removed%
                                      public!safety!or!structural!         !                    !                           !
structures%(e.g.!weir)%
                                      integrity!
Sediment,%litter%or%debris%           No!blockage!                         !                    !                           !
BATTER%SLOPES%AND%BASE%INVERT%
                                      Minor!erosion!only!that!does!
                                      not!prose!a!risk!to!public!safety!
Erosion%                                                                 !                      !                           !
                                      or!structural!integrity!and!would!
                                      not!worsen!if!left!unattended!
Crust%of%fine%sediment%               No!surface!crusting!                 !                    !                           !
                                      No!surface!depressions!or!
Depressions%or%mounds%                                                     !                    !                           !
                                      mounds!>!100mm!
                                      Filter!media!is!draining!freely,!
                                      whereby!water!is!not!ponded!
                                      on!the!surface!for!more!than!12!
Hydraulic%conductivity%or%
                                      hours!after!rainfall!and!there!is!   !                    !                           !
permeability%
                                      no!obvious!impermeable!or!
                                      clayElike!surface!of!the!filter!
                                      media**!
                                      Clean!out!points!not!damaged!
Underdrains%/%clean%out%points%                                            !                    !                           !
                                      and!end!caps!securely!placed!
                                                                      2!
Litter%                               Maximum!1!piece!litter!per!4m        !                    !                           !


[OCR of page images]
What to look for
SURROUNDS

Damaged or removed
structures (e.g. traffic bollards)

INLET

Erosion

Damaged or removed
structures (e.g. weir)

Sediment, litter or debris

Performance Indicator (PI) Condition Rating*

No damage that poses a risk to
public safety or structural
integrity

Inlet is structurally sound and
there is no evidence of erosion
or subsidence / settlement

No damage that poses a risk to
public safety or structural
integrity

No blockage

BATTER SLOPES AND BASE INVERT

Erosion

Crust of fine sediment

Depressions or mounds

Hydraulic conductivity or
permeability

Underdrains / clean out points

Litter

Minor erosion only that does
not prose a risk to public safety
or structural integrity and would
not worsen if left unattended
No surface crusting

No surface depressions or
mounds > 100mm

Filter media is draining freely,
whereby water is not ponded
on the surface for more than 12
hours after rainfall and there is
no obvious impermeable or
clay-like surface of the filter
media**

Clean out points not damaged
and end caps securely placed

Maximum 1 piece litter per 4m?

Maintenance Undertaken**

Additional Work Needed