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	B	D	E	F	G	H	I	J	K	L	M	N	O
1
2	1. Proposed Development
3
4	Figure 5.A1	KUALA LUMPUR falls under Region 1 (West coast)
5		Project Area	=	1	ha
6		Terrain	=	lowlying					1	l	=	1000	m3
7		% of impervious area	=	80	%
8									From Table 5.A1, Region 1 (West coast)
9	Table 5.A1	Permissible Site Detention (PSD/ha)							Impervious area		Lowlying
10		for 80% of impervious area;				=	65.300	l/s/ha	75	%	65.2	PSD
11		for area of 1 ha, PSD;				=	65.3000	l/s	90	%	65.5	PSD
12									75	%	478.3	SSR
13		Post-development discharge				=	0.0653	m3/s	90	%	540.4	SSR
14
15		Site Storage Requirement (SSR)				=
16		for 80% of impervious area;				=	499.0000	m3/ha
17		for area of 1 ha, SSR;				=	499.0000	m3
18
19	2. Determine the Inlet Pipe Diameter and Outlet Pipe Diameter
20									From Table 5.A2, Kuala Lumpur
21	Table 5.A2	- Take Kuala Lumpur to determine							Impervious area		Lowlying
22	refer 80%	OSD volume, Inlet Size and Oulet Size							75	%	62.0	PSD
23		(adopt smaller PSD and larger SSR)							90	%	62.3	PSD
24									75	%	466.1	SSR
25		PSD	=	62.1	l/s/ha	=	0.06210	m3/s	90	%	529.7	SSR
26		SSR	=	487.30	m3/ha	=	487.3000	m3	75	%	190.0	Inlet
27		Inlet Flow	=	196.67	l/s/ha	=	0.1967	m3/s	90	%	210.0	Inlet
28
29		(compare PSD with PSD obtained from Table 5.A1, adopt
30		smaller PSD),				PSD =	0.06210	m3/s
31		(compare SSR with SSR obtained from Table 5.A1, adopt larger				SSR =	499.0000	m3
32		SSR)
33
34	Table 5.A3	Inlet & Overflow Pipe (Require size)				=	510	dia. mm	From Table 5.A3, 1 ha
35		Inlet & Overflow Pipe (Propose size)				=	550	dia. mm	Impervious area		Lowlying
36	refer 80%	Oulet Pipe (Require size)				=	195	dia. mm	75	%	480.0	Volume
37		Oulet Pipe (Propose size)				=	195	dia. mm	90	%	540.0	Volume
38									75	%	500.0	Inlet
39									90	%	529.0	Inlet
40									75	%	195.0	Outlet
41									90	%	195.0	Outlet
42
43	3. Check for Inlet and Outlet Pipe Diameter
44									From Table 5.A4, Lowlying Terrain
45	Table 5.A4	Determine the Overflow Pipe Diameter using Inlet Flow obtained				=	448	dia. mm	Discharge	Dia.
46	(interpolate)	from Table 5.A2 as discharge : 0.1967 m3/s				~	450	dia. mm	0.06	292
47									0.08	315
48		Determine the Outlet Pipe Diameter using PSD value obtained				=	294	dia. mm	0.16	406
49		from Table 5.A2 as discharge : 0.0621 m3/s				~	300	dia. mm	0.22	474
50
51	4. Sizing of On Site Detention Pond
52		The required storage is				=	499.0000	m3
53		Propose OSD Drain Size				=	583.2	m3
54						27mx27mx0.8m	583.2 x 499	OK!
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