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LEVEL 1 DRAINAGE ANALYSIS
' FOR
R.C. CONSULTING SHORT PLAT
' RENTON, WASHINGTON
' REVISED JANUARY 31, 1993
DECEMBER 2, 1992
' TRIAD JOB NO. 92-158
' PREPARED BY: REVIEWED BY:
BRIAN J. DARROW ALAN D. FURE, P.E.
p RV
EC £
' )iON
1 _ CIATES
1
LEVEL 1 DRAINAGE ANALYSIS
' FOR
1 R.C. CONSULTING SHORT PLAT
RENTON, WASHINGTON
' REVISED JANUARY 31, 1993
DECEMBER 2, 1992
' TRIAD JOB NO. 92-158
1
PREPARED BY: REVIEWED BY:
BRIAN J. DARROW ALAN D. FURE, P.E.
j
1
' EXPIRES 4/19/ q
1
=T
1 _ CIATES
TABLE OF CONTENTS
1
' INTRODUCTION .....................................................................................2
VICINITY MAP........................................................................................3
' ONSITE DRAINAGE BASIN ...................................................................4
Upstream Drainage Analysis for the Basin........................................4
' Upstream Analysis for Point 1/4 Mile Downstream of Basin ............4
' Downstream Drainage Analysis........................................................4
RESOURCES USED FOR ANALYSIS.....................................................5
APPENDIX................................................................................................7
OnsiteBasin Map.............................................................................8
' Upstream Tributary Area Map..........................................................9
' Area Tributary to 1/4 Mile Point Map ................................ ...........10
Downstream Reach Chart.................................................................I I
' Downstream Drainage Map..............................................................12
Landslide Hazard Areas ............................................. ...........13
' Seismic Hazard Areas ......................................................................14
Erosion Hazard Areas.......................................................................15
' Wetlands, Fish-Bearing Waters, and 100-year Floodplain Map.........16
' Water Types Map.............................................................................17
S.C.S. Soils Map..............................................................................18
' FEMA Map......................................................................................19
1
INTRODUCTION
The proposed project is to subdivide approximately 0.9 acres into a two lot short plat.
' The rectangularly shaped parcel is located on the north side of N. 401h- Street,directly east
' of Park Avenue N. More generally, the site lies within Section 32, Township 24 North,
Range 5 East, in Renton, Washington.
A site visit was made on November 18, 1992, an overcast day. The site is vegetated by
' short prairie grass and a few deciduous trees. The only other significant feature on the site
is a house under construction. The entire site consists of slopes ranging from 6 to 15
' percent sloping from the south to the north towards May Creek. The S.C.S. Soils Map,
' located in the appendix, indicates the site is underlain by Alderwood gravelly sandy loam.
' There is only one drainage basin,onsite. All runoff from the site flows overland to May
Creek which empties into Lake Washington just past the quarter mile point downstream of
the site (see Onsite Basin Map and Downstream Drainage Map both located in the
' appendix).
LEVEL 1 DRAINAGE ANALYSIS FOR R. C. CONSULTING SHORT PLAT - PAGE 2
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a C
ONSITE DRAINAGE BASIN
' UPSTREAM DRAINAGE ANALYSIS FOR THE BASIN
' There is less than one-half acre tributary to the onsite drainage basin. Please refer to the
Upstream Tributary Area Map located in the appendix.
' UPSTREAM ANALYSIS FOR POINT QUARTER MILE DOWNSTREAM OF BASIN
' The point that lies one quarter mile downstream of the site is located in May Creek
approximately 100 feet upstream of Lake Washington. The area tributary to this point is
tthe entire May Creek drainage basin. According to the area defined in the Basin
Reconnaisance Program Summary, the May Creek basin conprises 12.9 square miles or
8,256 acres. Please refer to the Area Tributary to 1/4 Mile Point Map located in the
appendix.
' DOWNSTREAM DRAINAGE ANALYSIS
Please refer to the Downstream Drainage Map and accompanying spreadsheet in the
appendix for identification of specific reaches in the downstream drainage system. As
' indicated in the spreadsheet, there were no visual problems with erosion, flooding,
capacity, sedimentation, or overtopping.
LEVEL 1 DRAINAGE ANALYSIS FOR R. C. CONSULTING SHORT PLAT - PAGE 4
1
RESOURCES USED FOR ANALYSIS
Adopted Basin Plan
' The site is located in the May Creek Draiage Basin. According to the 1990 King County
' Surface Water Manual, a basin plan has not been adopted for this area.
' Basin Reconnaissance Summary Report
The site lies within the May Creek Drainage Basin as defined in the King County Basin
Reconnaissance Program Summary Volume II. (please refer to the Area Tributary to 1/4
' Mile Point Map located in the appendix). May Creek is located approximately 250 feet
north of the site. The Reconnaissance Summary does not present any information on May
' Creek. May Creek was either not considered in the study or no present problems were
present and anticipated problems were not expected.
' Critical Drainage Area Maps
The site is not located in any of the critical drainage areas discussed in the reference .
' section of the 1990 King County Surface Water Manual.
' Flood Plain/Floodway Maps
The 100-year flood plain was found on the FEMA Flood Insurance Rate Map for the
creek. (see FEMA map in the appendix). The floodplain elevation does not come within
200 feet of the site. The maximum floodplain elevation nearest the site (elevation 31) is
twenty feet below the lowest point on the site (elevation 51).
LEVEL 1 DRAINAGE ANALYSIS FOR R. C. CONSULTING SHORT PLAT - PAGE 5
Sensitive Areas Folio
' The King County Sensitive Areas Maps did not reveal the site to be in a problem area in
' regards to wetlands, erosion, landslide, or seismic hazards (please refer to the appendix for
the appropriate maps). The maps do indicate a 100-year flood plain approximately 200
' feet north of the site associated with May Creek which runs approximately 250 feet north
of the site.
SWM Division Drainage Investigation Section Problem Map
' According to the SWM Division Drainage Investigation Section Problem Map, there have
' been no complaints in this particular area or downstream of the site.
' Wetland Inventory Notebook
The Wetland Inventory Notebook indicated there were no wetlands located on the site or
in the surrounding area.
LEVEL 1 DRAINAGE ANALYSIS FOR R. C. CONSULTING SHORT PLAT - PAGE 6
1
1
i
1
1 APPENDIX
i
1
i
1
1
i
1
1
1
1
1
1
1
LEVEL 1 DRAINAGE ANALYSIS FOR R. C. CONSULTING SHORT PLAT - PAGE 7
1
slirX :
r
i I E = �, /
I K ENNYDALE CO N
WATER O t �
1 TOWER 1 I
KENNYDALE CO.
j SCALE 1" = 111'
1 I e STACK f
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/ BASIN AREA \�
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125
x-
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B R U s/
ONSITE BASIN MAP
1
LEVEL 1 DRAINAGE ANALYSIS FOR R. C. CONSULTING SHORT PLAT - PAGE 8
1
II / /
II
/ I /
' I KENNYDALE CO /
WATER O I SCALE 1" = 200'
To%TR
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e STACK
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AREA = 0.3 AC I I x
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LL1 , ——
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UPSTREAM TRIBUTARY AREA MAP
LEVEL 1 DRAINAGE ANALYSIS FOR R. C. CONSULTING SHORT PLAT - PAGE 9
7
9Ry
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visa=
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r
DOWNSTREAM REACH CHART
r
REACH REACH APPROX. APPROX. REACH OBSERVED POTENTIAL
DESCRIPTION SLOPE LENGTH CHARACTERISTICS PROBLEMS PROBLEMS
K
A OVERLAND FLOW TO 10% 230 feet Flow over densely vegetated NONE NONE
MAY CREEK slope down to May Creek.
z
p
n
zWell defined drainage corridor:
5-15' wide, depths ranging
B MAY CREEK 1-2 % 1090 feet from 1-3 feet deep. Overflow NONE NONE-
bank approximately 1 foot
higher than observed water
surface
y
b
r
C LAKE WASHINGTON --- ---
Lake NONE NONE
r
1
Sir
I K ENNYDALE CO /
1 WATER Q —
TowER
KENNYDALE CO. ❑
STACK ❑ b
I
1 CK I SCALE 1" = 200'
e �
1 1/4 MILE POINT
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DOWNSTREAM DRAINAGE MAP
LEVEL 1 DRAINAGE ANALYSIS FOR R. C. CONSULTING SHORT PLAT - PAGE 12
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S.C. S. SOILS MAP
LEVEL 1 DRAINAGE ANALYSIS FOR R. C. CONSULTING SHORT PLAT - PAGE 18
_1.,.—--..-:-_.�_.1.--,_.._.��..._---� .__._-..-.....�:--.-.T- .....c�.a a-.aw,:.+owvai:. .,. .._. .. s.;"::asso:ersi�w'rht:.,.,r;:<v�wu'aewxw..w.arsx•: --.. ._—. _ - _—__'—__._._.___—_ KEY TO h1Al'
-- ---- — -- -- --_--- 1 500-Year Flood Boundary
100•YearFlood Boundary ZONE B
ZbNE�A�'
Zone Designations•With
Date of Identification
'-- _ e.g., 1212174 N
100-Year Flood Boundary------ ��
ZONE B
500•Year Flood Boundary------. - -
405
Base Flood Elevation Line 513
With Elevation In Feet"
9
a
` + _ — —�_ _ Base Flood Elevation in Feet (EL 987)
CORPORATE LIMITS —� Where Uniform Within 7_onc'•
Elevation Reference Mark RM7X I!
' Qp River Mill: •M 1.5
**Referenced to the National Geodetic Vertical Datum of 1929
tzi,i. g. *EXPLANATION OF ZONE DESIGNATIONS. t
!.()NE EXPLANAIION
2 A Areas of 100•Year flood; base {loud elev,itions and
�i..
flood hazard factors not determined.
�I uc between one (I) and three(3) Icet;average depths
i `s•y �\G � AO An•.,s of Illlt-ycar sh.tlluw Ilonding where depths
are JelcnnincJ.
Q of inundation ,ue shown, but no {loud h,v,ud lactors
w
Y AH Areas of 100-year shallow flooding where depths
v G are between one (I) and three (3) feet; base flood
h' PJ J are delcrrminecl shown, but no flood hazard factors
Al A30 Areas of IUU•Ycar Ilond; base (loud cicv.,lions and
IIouJ h.tzard lactors dcicuninrJ.
protection system under construction; base flood
I, A99 Arcas of 100•year Iluud to be perstccled by flood
ZONE C �P
elevations and flood hazard factors not determined.
z
B Are.ls between limits o1 the 100•Ycar IInoJ and 500•
ELEVATION REFERENCE MARKS Year fll, .1v or certain areas subiccl to ) loottoo-year Ilood-
wlicre
ing with .rvcragc dcplhs Icw Ih,ul one (I) loot or where
POO I the contributing drainage area is Icss Ihan one square
�L REFERENCE ELLVATION
};� �• Gt'' � SE 80T1�STREET MARK (FT, NGVD) DESCRIPTION OF LOCATION mile;or area,, prulccteJ by levers hum Ihr base IIuuJ.
(Medium shading)
BARnEF MILL ROAD
(PRIVATE ROAD) RM12 75.31 Top hull Ini.ued 0.5 foot noflh of south end of a 3-foot concrete C Areaso(minimal flooding. (NoshaJing)
k f walk at southeast comer ref Interstate I lighway 405 bridge crossing
D Areas of untlelt use,l, but pnsvl+IV, flood ha/args.
.. I ZONE B �23 \fay (.reek, witcicJ in the n.�ill,wrsl rluhv ( of Section on 1.•1N, t
2d.
Ci V Arcas of IUU\ear to-10al flood w,1h selusily (ss.rve
/ I I:SI'., \\'illann tte NleriJian. I ,I.ihli.hcJ by (.its of Renton Pul+lie action);here tlooJ elevations an+l flood h.VInJ factors
.6 � Works ucl+,utincttl. nut is of i00-y 1
V1 V30 Arc,n ul IUU•Yc.,r cuast.,l tlunJ with vrlutity (wave
r / RM13 95.92 Railroad spike in power pole numhcr 1925, at northeast corner I action);ba%e flood elevations and flood hazard factors
.i` LIMIT OF— j of yard .,I 1925 Nurthe•,sst i;Ist Strevi, situated in the southeast determined.
DETAILED (pwrter of St'Lliun 32, 121N, R51., Willame•Ite Meridian. Lslab-
STUDY N 4 llslied by City of Renton Public Wufks Department.
STUDY
21
ZONE rtN114 115.93 Raihu.ul spike in power pole number IU'J4, at residential address Nul I � ift U`1 R
5312 Northeast 31st Street, situated in the southeast quarter of
l ertain areas not in the special flood hazard arras(zrnles'A and V)
I36 Section 32, T24N, RSL, Willanu'1tc Mcridi•ut, King County, \\'ash• m.ty fill prrvtccled by Iinod control s110Llures.
+ t ZQNE A2 �Q 38 ington. Established by City of Renton I'ublic Works Department.
ITE RM12 this reap % Inr flojtca% %whit- r1 {+Iloo.r•s uIn ; it too nut ones
satil'v show- ,tll area,, sufilecl to IlooJu,g ut Ifir conunumly' or
i S I all pLmintetriL Ir.1ltnes nulsnle spot i.11 flood h.varrl .ueas.
ZONE B
if Qp`.
NORTH
40T STREE For .uliuirtirig m.,p panels, srr separately printed InJes In Map
I'.tncls.
� y^
ZONE B
Jv
00 INITIAL. IDENTIFICATION: j
JUNE 7,1974
4' Z I LUOD HAZARD BOUNDARY MAI' RI_VISIONS:
' ------ - -'-- --- _. _-- w I NOVEMBER 7, 1915
O .' ) N RTH 38TFI STREET —_ .— Z
> —
52 w P 11.00I) INSURANCE RAT MAP F.FFIXI I\11 :
I
�Q" I MAY 5, 1981
�OQ F O 1 LOUD INSURANCL RA I L MAI' RLVISIONS: j
¢ U 1
O
441 L
�Y NORTHEAST 36TH STREET —�
—ZONE B
r"r' Qv NORTH 35TH STREET 62 ZONE A2 ;
/ 64 y
c�
L I
Z I ZONE C 1
r'- cc w
p > F :
t4 Z a I
4' 72
NORTH 33RD iTREET ZONE B•_ �I
Refer to file 1 1.1)OI) INSURANCE RATE N1AP EFFECTIVE date
ZONE B shown on this map to determine when actuarial rates apply to
4 Q 11 j %ilmlun•s in the/ones where elevations of dcplhs have been c+1ah• i
Q Y Nc ZONE B ZONE lishe,l.
t� :7 •... > ?fSr s RM13 102 B
4 w G r Trt determine it (loud insurance is availabie in this communitY,
w a RFfT 97 ` R(+;llrl �/�\ 1'rng,arncow il.1 Y�t (8 ur u))r638e6>20,(itt(800) I12•1.8872r call the al Flood Insurance
ca
ZONE B 87
;: 92 v 1
-------- -- ----- - - 17
NORTH ---30_IltSfREF7 ---- �"
ZONE A2
ZONE )
B 50o AI'PKUXIMo I L SCALE 500 FEET
i
Z , v ZONE B j
I m ZONE
ST.nrFT .. r--------_..
Yn r y I ',1_IMI I UI
`ZONE B �a° u1 I All 11) NATIONAL FLOOD INSURANCE PROGRAM
ZONEA2 sluu�,
�t
}
' NORTHEg$T 27Tfi
ZONE C i Iyl FIRM
_ FLOOD INSURANCE RATE MAP
1 t N
x7
,, ---- ~ C 17 Y OF
-- ' RENTON, WASHIN'GTON
a LCORf'ORATE LIMITS KING COUNTY
o _ _
I
�. it
PANEL 1 OF 5
pro:
(SEE MAP INDEX FOR PANELS NOT PRINTED)
4"t{ Vrt z
k — ZONE C
x
I I
��;,
`C,,F, ♦` z I I COMMUNITY-PANEL NUMBER
r 530088 0001 B 1
405
EFFECTIVE DATE:
��q I i
O I
' } I I I I I�IIIL c (u1n►> ! MAY 5, 1981
9
F o \ I AREA NOT INCLUDIA)
—\ � F
� federal a vergency management agenc
y
L� --- - —-- — -------- — —
.':: C �,)NsFT (;oui rvnr,�, -- I _ I federal insurance administration
t� r I JOINS PANEL 0003
JOINS PANEL 0002