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ON SITE DETENTION (DESIGN PROCEDURES (review all plan, submit preliminary…
ON SITE DETENTION
DESIGN PROCEDURES
review all plan
submit preliminary drainage plan
copies of approve plan
discuss site layou
select discharge control device
prepare contour plan
finalise storage volume
design storage system
design drainage
identify drainage sonstraints
preliminary drainage plan
detail design drawing
calculation sheets
review design
maintenance schedule
submit building plan application
PRIMARY OUTLETS
proprietary products
wibeldrossel
hydrobrake
Phillips Multi-cell
discharge control pit DCP
to flow regulator house for above ground storage
flow restricting pipe
difficult to modify hydraulic capacity
trash screens
screen type
screen area
screen orientation
general consideration
orifice
simplest flow regulating devices
general design consideration
flow regulator location
protection from blockage
flow regulation
drowned outlets
SECONDARY OUTLETS
above ground - broad crested
below ground - overflow system
OPERATION AND MAINTENANCE
general
install acces ladder
minimizing maintenance
fitted inlet pit & manhole
provision for freshwater
maintenance schedule
by property owner, resident, handymen
clear and simple
residential lots
inspect every 3 month
clean every 6 months
commercial & industrial lots
inspect every 2 months
clean every 2 months