Stormwater Management Plan

STORMWATER MANAGEMENT AND MAINTENANCE PLAN

 

aes MAINTENANCE OF RAPID INFILTRATION PITS (RIP’s)
1. Objective To ensure ongoing function of RIP’s in reintroducing
runoff into the subsoil and prevent
surcharge/flooding.
Consequences of | Possible flooding of building during storm events.
Failure
2. Management Strategy | RIP internal surface to remain free of silt/sediment

build-ups.

RIP grates to remain clear and free of debris or
blockages.

 

Actions

Maintenance Contractor to be issued with
laminated copies of final ALTA Projects drawings
A6769/22/PD01 to PDO5 for reference.

Swales and RIP surface grates to be kept clear of
any debris or blockages.

Maintenance contractor with appropriate
enclosed spaces qualifications and procedures in
place to enter each RIP to inspect at quarterly
intervals and after any event where more than
50mm of rain has fallen.

Any debris, leaf litter etc accumulated in the RIP to
be removed and disposed of lawfully.

Upper BIDIM A14 filter layer to be inspected and if
more than 50% covered in silt or mud replaced.

Upper BIDIM A14 filter layer to be replaced
annually.

When replacing upper filter, the sand layer below
to be inspected for discolouration and
contamination and if present ALTA Projects to be
notified for review and further advice.

RIP walls and balance pipes to be inspected for
any signs of cracking or degradation. If observed
ALTA Projects to be notified.

All removed filter layers, sand, sediment, silt to be
disposed of lawfully.

 

Performance Indicators

No surcharging of RIPs.
No overflow from rock pitched weirs

 

Frequency/Deadline

Inspections after rain events or quarterly
(whichever comes first)

 

 

 

Reporting and Review

 

Maintenance Contractor to make entries in service
diary.
Site Owner to review service diary annually.