Report (683) 03/23/1999 14:16 5036539095 COMF':;SS EN 11IEERII1G PAGE 02
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TRIANGLE TERRACE
OFFICE BUILDING
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STORM ANALYSIS
March 1999
Prepared by:
Bruce D. Goldson, P.E.
Compass Engineering ��
6564 S.E. Lake Rd. f
Milwaukie, OR 97222 ��
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,4yi a ':•, 10—.. N S ' ` .', .� fit .i:
h i. 1107.4 ;1108.5 :`�'" .' l A a' �. t. b • � M• . ��� : • = > < < K��r.sUNIFdAM:'L � �1 c:C
. O
. 1107.4 Abandonment. When .`'
" ' �' : °: :1".:1•7,....1'.1:.'
"
'
ed by dministra
, requir y the :v�Authori�y;:f',`
:; every drywell which has been abandoned`or• has: been`.'otherwisg : ;;= ::;�;.. •
. . • . discontinued from further use shall .be completelyfilled witti•'earti5 sand,'
gravel, concrete, or other approved material • • : . ,. ' s; :r .
•
1108.0 Catch Basin Specifications . .
1108.1 .General. Catch basins shall be made of approved nmaterial and
:: •;: `;i: ,;�: :!.:;.';::.),........j . sized to carry the designed capacity •
..,, `s' •�: • <�� :i• _ ' ;C: : �Y,�.•.a. C', gn . Catch basins shall have an inside •
.. _ dimension of not less than twenty-four (24) Inches (609.6 nun) and extend
i • . not less than twenty -four (24) inches (609.6 run) below the water line. The '
catch basin can be either square or round and shall be provided with a top
I turned out flange of not less than two (2) inches (50.8 mm) and the outer ir)
...; edge raised to a height of a top edge of the grate. Catch basins made of cast
iron shall have a wall thickness of not less than one - quarter (1/4) inch (6.4
mm) with sleeves attached for connecting the storm drain line, or have other
attachment means. Cast iron and steel catch basins shall be asphalt coated
r inside and outside.
•
Steel -plate catch basins shall not be less than ten (10) gauge, joined with '
welded seams with sleeves attached for connecting the storm drain line or
6 • have other attachment means.
Concrete catch basins shall have a wall thickness of not less than four (4)
inches (100 mm) and be reinforced with number four (4) steel rod installed
•
at intervals not to exceed six (6) inches (150 mm) on center. The inside —
` surface shall have a trowel finish, constructed so as to be watertight. The
• size shall be the same as for cast -iron and steel catch basins. ,
1108.2 Trap. All catch basins shall be trapped by usin an inverted
' one - quarter (1/4) bend or welded baffle. Traps so constructed shall provide , ;
no less than a six- (6) inch (150 mm) water seal. When other than a turned
down one - quarter (1/4) bend is provided, a cleanout shall be required as
•.•;- .; . ,;,.,;: i :; • 44..f^6, (: ::. . :, _:,4 f per Section 719 of this Code_
1108.3 Outlets. Outlets installed in standard twenty-four (24) inch catch
basins shall be at least three (3) inches (75 mm) and not larger than six (6)
. inches (150 mm). When outlets larger than six (6) inches (150 mm) are
• p
•
rovided, a drawing and specifications shall be submitted to the
Administrative Authority for approval of the alternate sizing. All
connections to catch basin outlets shall be made by approved methods.
1108.4 Catch Basin Grates. Grates for catch basins shall be made of
• approved materials and shall be capable of supporting the anticipated load.
Grates shall be designed to prevent bicycle and wheelchair tires'and wheels
• from entering or becoming entrapped.
F ;' - ' 1108.5 Protection of Piping; p g; Integrity.. When drainage piping •
: ' : to or from any catch basin is subject to heavy vehicular traffic or other •
• excessive loads, such piping shall be structurally designed to withstand all
anticipated loads and shall be installed on a firm bed throughout its entire
• length.
120.4
•
•
03/23/1999 14:16 5036539095 COMPASS Er'ruIrIEERiNG PAGE D6
.. :: . '.447:) , , '5; STORM •AND G AO J • ;•• ' ., ,; .:.',.
�. a. 0∎10 /ATER ORAINAGE;:`"yj; lt . ,-:� ;A�_., ble' �s� , ,-
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TABLE 11 -2 • e '� .
.. Si Horizontal Rain , ::�; ;'; "y . r
Size of Honz water Piping '�'` "'� � '
Size of Pipe " ''
. in Inches Maximum-Rainfall in Inches per Hour
1/8" Slope 2 3 4 • 5 . 6
3 1644 1096 822 657 •
: ti 4 3760 2506 1880 1504.: • 1 53 '
7r.• . • 5 6680 4453 3340 • 2672 2227.
•
6 10,700 7133 • 5350 . . 4280 3566 •: •
8 23,000 15,330 11,500 9200 :.. ; 7600
10 41,400 27,600 20,700 16,580. .13,800
12 66,600 44,400 33,300 26,650 ' 22200 •
Size of Pipe
•
in Inches Maximum Rainfall in Inches per Hour
. 1/4" Slope 2 3 4 5 6
3 2320 1546 1160 928 773
4 5300 3533 2650 2120 1766
t 5 9440 6293 4720 3776 3146
6 15,100 10,066 7550 6040 5033
8 32,600 21,733 16,300 13,040 10,866
10 58,400 38,950 29,200 23,350 .19,450
12 94,000 62,600 47,000 37,600 31,350
•
• Size of Pipe
in Inches Maximum Rainfall In Inches per Hour
1/2" Slope 2 3 4 5 6
3 3288 2295 • 1644 1310 1096•
4 7520 5010 3760 3010 2500 •
�. ..•.. '• ..., ..... \~ �� ` • • . •':,:ii. h• ,0 5 13,360 8900 6680, 5320 4450
6 21,400 13,700 10,700 8580 7140
8 46,000 30,650 23,000 18,400 15,320
•
10 82,800 55,200 41.400 33,150 27,600
12 133,200 88,800 66,600 53,200 44,400
15 238,000 158,800 119,000 95,300 79,250 •
•
•
120.7
•