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1. INTRODUCTION
The subject development proposes the division of groximately 0.45 Acres into 2single-
family lots. It is located along the south side of 176 street SW, just west of Olympic
View Dr..
In the existing condition the site is cleared with one existing single family residence. The
existing residence will not be figured into calculations.
Per the Snohomish County Soils Survey, the soils in this area are Alderwood, Hydrologic
soils group C.
11. DESIGN OVERVIEW AND STANDARDS
Runoff is to be collected and conveyed to an underground detention pipe located in the
central area of the site, under the proposed driveway. From detention, runoff shall be
discharged into the existing storm drainage system within 176'h Street SW.
OFFSITE- RUNOFF
The subject site is located on a slight rise with topography sloping away on all sides.
Little or no runoff is anticipated to runoff onto the site.
THE DEVELOPED CONDITION
The developed condition will simply increase the amount of impervious area on the site.
Impervious areas are as follows:
Roads 0.02 acres
Pond 0.00 acres
Lots 0. 18 acres (4,000 sf / lot*
Total 0.20 acres @ CN 98
Most existing impervious area has been or will be demolished during new home
construction. The new home currently under construction has a roof plan of only
2,800 sf and the second is likely to be similar. An assumed value of 4,000 sf per lot
should be adequate to include the new homes and any impervious area from drives
and patios.
The balance of 0.25 acres will be evaluated @ CN 86.
Runoff from the site, including roof drains, will be conveyed via yard drains and
underground pipes with in the yards.
CAMy Documents\DRN. REM99025drn.doc Last printed 09/16/99 9:03 AM
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DETENTION AND RELEASE
Detention and release will be per DOE standards. Because runoff will ultimately be
discharged into the Puget Sound, discharge will be limited to maintain the existing
condition peak flows for the 2, 10 and 100 yr. events.
The total area being considered in this basin is approximately 0.45 Ac. As noted above,
the soil is ofthe hydrologic soils group C.
A 48" pipe was selected as the detention structure for this project. The length was
determined to be 55'.
From Snohomish Co. Isopluvials, intensities are as follows:
Era;
Intensities in total inches in 24 hr event are-,
2 1.50"
yr.
10 yr. 2.00"
100 3.00"
0
yr.
The basins and hydrographs developed by the Waterworks software are attached to this
i
report.
The stage discharge calculations made with the Water -works software predict a single
co
orifice discharge structure with a riser discharge to handle overflow. The orifice is to b
1.00" diameter at elevation 426.00' (2 feet below the outlet elevation). The 12" diameter
riser is to be at elevation 432.00'. Please see Waterworks summary attached.
Stage calculations show a high water stage for the 100 year event at 432.02', providing a
total detention volume of-, 683 cE
DOWNSTREAM ANALYSIS
Discharge ftom the proposed detention structure will flow directly into an existing catch
basin along the southern side of 176b Street SW.
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CAMy DocumentsTRN. REM99025drn.doc Last printed 09116/99 9:06 AM
L
-9/1�/qq Hardt Engineering page I
0 HOVDE SHORT PLAT
DETENTION CALCUALTIONS
IST SUBMITTAL
BASIN SUMMARY
BASIN ID: Al NAME: 6 MO EX
SBUH METHODOLOGY
TOTAL AREA ....... 0.45 Acres BASEFLOWS: 0.00 cfs
RAINFALL TYPE .... TYPE1A PERVIOUS AREA
PRECIPITATION .... 0.99 inches AREA..: 0.45 Acres
TIME INTERVAL .... 10.00 min CN.... : 86.00
TIME OF CONIC ..... 22.21 min IMPERVIOUS AREA
ABSTRACTION COEFF: 0.20 AREA..: 0.00 Acres
CN .... : 98.00
TcReach - Sheet L: 125.00 ns:0.1500 p2yr: 1.55 s:0-0100
PEAK RATE: 0.01 cfs VOL: 0.01 Ac-ft TIME: 540 min
BASIN ID: A2 NAME: 2 YR EX
SBUH METHODOLOGY
TOTAL AREA ....... 0.45 Acres BASEFLOWS: 0.00 cfs
RAINFALL TYPE .... TYPEIA PERVIOUS AREA
PRECIPITATION .... 1.50 inches AREA..: 0.45 Acres
TIME INTERVAL .... 10.00 min CN.... : 86.00
TIME OF CONIC ..... 22.21 min IMPERVIOUS AREA
ABSTRACTION COEFF: 0.20 AREA..: 0.00 Acres
CN.... : 98.00
TcReach - Sheet I L: 125.00 ns:0.1500 p2yr: 1.55 s:0-0100
PEAK RATE: 0.03 cfs VOL: 0.02 Ac-ft TIME: 490 min
BASIN ID: A3 NAME: 10 YR EX
SBUH METHODOLOGY
TOTAL AREA ....... 0.45 Acres BASEFLOWS: 0.00 cfs
RAINFALL TYPE .... TYPE1A PERVIOUS AREA
PRECIPITATION .... 2.00 inches AREA..: 0.45 Acres
TIME INTERVAL .... 10.00 min CN.... : 86.00
TIME OF CONC ..... 22.21 min IMPERVIOUS AREA
ABSTRACTION COEFF: 0.20 AREA..: 0.00 Acres
CN.... : 98.00
TcReach - Sheet L: 125.00 ns:0.1500 p2yr: 1.55 s:0.0100
PEAK RATE : 0.06 cfs VOL: 0.03 Ac-ft TIME: 490 min
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9/16/99 Hardt Engineering page 2
HOVDE SHORT PLAT
DETENTION CALCUALTIONS
IST SUBMITTAL
BASIN SUMMARY
BASIN ID: A4 NAME: 100 YR EX
SBUH METHODOLOGY
TOTAL AREA ....... 0.45 Acres BASEFLOWS: 0.00 cfs
RAINFALL TYPE .... TYPElA PERVIOUS AREA
PRECIPITATION .... 3.00 inches AREA..: 0.45 Acres
TIME INTERVAL .... 10.00 min CN.... : 86.00
TIME OF CONC ..... 22.21 min IMPERVIOUS AREA
ABSTRACTION COEFF: 0.20 AREA..: 0.00 Acres
CN.... : 98.00
TcReach - Sheet L: 125-00 ns:0.1500 p2yr: 1.55 S:0-0100
PEAK RATE: 0.13 cfs VOL: 0.06 Ac-ft TIME: 480 min
BASIN ID: BI NAME: 6 MO DEV
SBUH METHODOLOGY
TOTAL AREA ....... 0.45 Acres BASEFLOWS: 0.00 cfs
RAINFALL TYPE .... TYPElA PERVIOUS AREA
PRECIPITATION .... 0.99 inches AREA..: 0.25 Acres
TIME INTERVAL .... 10.00 min CN.... : 86.00
TIME OF CONC ..... 10.00 min IMPERVIOUS AREA
ABSTRACTION COEFFt 0.20 AREA..: 0.20 Acres
CN.... : 98.00
PEAK RATE: 0.04 cfs VOL: 0.02 Ac-ft TIME: 480 min
BASIN ID: B2 NAME: 2 YR DEV
SBUH METHODOLOGY
TOTAL AREA ....... 0.45 Acres BASEFLOWS: 0.00 cfs
RAINFALL TYPE .... TYPEIA PERVIOUS AREA
PRECIPITATION .... 1.50 inches AREA..: 0.25 Acres
TIME INTERVAL .... 10.00 min CN .... : 86.00
TIME OF CONC ..... 10.00 min IMPERVIOUS AREA
ABSTRACTION COEFF: 0.20 AREA..: 0.20 Acres
CN.... : 98.00
PEAK RATE: 0.08 cfs VOL: 0.03 Ac-ft TIME: 480 min
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BASIN ID: B3 NAME: 10 YR DEV
SBUH METHODOLOGY
TOTAL AREA ....... 0.45 Acres BASEFLOWS: 0.00 cfs
RAINFALL TYPE .... TYPEIA PERVIOUS AREA
PRECIPITATION .... 2.00 inches AREA..: 0.25 Acres
TIME INTERVAL .... 10.00 min CN.... 86.00
TIME OF CONC ..... 10.00 min IMPERVIOUS AREA
ABSTRACTION COEFF: 0.20 AREA..: 0.20 Acres
CN.... 98.00
PEAK RATE: 0.12 cfs VOL: 0.05 Ac-ft TIME: 480 min
BASIN ID: B4 NAME: 100 YR DEV
SBUH METHODOLOGY
TOTAL AREA ....... 0.45 Acres BASEFLOWS: 0.00 cfs
RAINFALL TYPE .... TYPEIA PERVIOUS AREA .25 Acres
PRECIPITATION .... 3.00 inches AREA..: 0
TIME INTERVAL .... 10.00 min CN.... : 86.00
TIME OF CONC ..... 10.00 min IMPERVIOUS AREA
ABSTRACTION COEFF: 0.20 AREA..: 0.20 Acres
CN.... 98.00
PEAK RATE. 0.21 cfs VOL: 0.08 Ac-ft TIME: 480 min
-,7
Engineering
page 4
9/16/99
Hardt
HOVDE SHORT PLAT
DETENTION CALCUALTIONS
IST SUBMITTAL
HYDROGRAPH
SUMMARY
PEAK
TIME
VOLUME
HYD
RUNOFF
OF
OF
Contrib
Area
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NUM
RATE
PEAK
HYDRO
cfs
min.
cf\AcFt
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0.006
540
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0.45
2
0.029
490
804 cf
0.45 Z e-
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0.058
490
1387 cf
0.45
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4
0.129
480
2716 cf
0.45
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0.039
480
742 cf
0. 45 r_
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0.077
480
1376 cf
0.45 Z J7,
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7
0.118
480
2059 cf
0.45
M
8
0.207
480
3518 cf
0.45
0.45
M
18
0.031
560
1376 cf
4Z-
19
0.040
570
2060 cf
0.45
20
0.119
520
3519 cf
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9/16/99
Hardt Engineering
page 6
HOVDE SHORT PLAT
DETENTION CALCUALTIONS
IST SUBMITTAL
DISCHARGE STRUCTURE
LIST
MULTIPLE ORIFICE ID No.
Description:
outlet Elev: 428.00
Elev: 426.00 ft
Orifice Diameter: 1.0000
in.
RISER DISCHARGE
ID No. 2
Description: RISER
Riser Diameter (in):
12.00 elev:
432.00 ft
Weir Coefficient ...
3.782 beight:
433.00 ft
orif Coefficient ...
.9.739 increm:
0.10 ft
COMBINATION DISCHARGE
ID No. 3
Description:
Structure: 1 Structure:
Structure: 2 Structure:
Structure: