on-site storage control zrooftop storage zparking lot storage zunderground storage commercial...
DESCRIPTION
Roof structures Parking 95% impervious Roads 90% impervious Building footprint 30% Parking and Roads 65% Pervious 5% Total Width W Roof storage 75%total roof area Total Breadth B Parking 67% B Roads 33% B Schematic of Commercial SiteTRANSCRIPT
On-Site Storage Control
Rooftop storageParking lot storageUnderground storage
Commercial developments may have a percentage of impervious areas of 85% or more. On-site storage is often preferred to centralized storage for cost sharing, quality control and spill control. Methods include:-
Roof structures
1 2
3
Parking95%
impervious
Roads90%
impervious
Buildingfootprint
30%Parking and Roads
65%Pervious
5%
Total Width W
Roof
stor
age
75%
tota
l roo
f are
a
Tot a
l Bre
a dth
B
Park
ing
67%
B
Road
s33
% B
Schematic of Commercial Site
Roof structures
1 2
3
Parking95%
impervious
Roads90%
impervious
Buildingfootprint
30%Parking and Roads
65%Pervious
5%
Total Width W
Roof
stor
age
75%
tota
l roo
f are
a
Tot a
l Bre
a dth
B
Park
ing
67%
B
Road
s33
% B
Schematic of Commercial Site
Example of On Site control
Totalarea 10 ha
Imperv. 90% 1.95
Pervious 10% 0.22
Parking 4.33
Roads 2.17
Roof 3.00
Parking &roads 6.50
Grass 0.50
73%imper
v
0.50
Imperv. 95% 4.11
Pervious 5% 0.22
Part 3 pervious areaPart 3 impervious area
0.72
1
3
2
Part 3 total area 2.671.95
Example of On Site control
Model Rooftop storage
Roof areahectares
Store areahectares
Area/drainsq.metre
Drain flow L/min/25m
m
Roof slopegH:1V
3.000 2.250 450.0 24.000 200.00
Outflow from Rooftop
Parking Lot storage
99.0
100.0Inlet Control Device
100.5
Define Wedge storage
Wedge invert
Grade 1 g1H:1V
Grade2 g2H:1V
Angle subtended
Number of wedges
100.00 60.00 120.00 90.00 67.00
Outflow from Parking storage
Parking lot storage (2)
Rim elevation
Catch basinInvert level
Volume
Discharge
Rim capacity
Compare outflow with and without on-site storage
0.889
0.492