HomeMy WebLinkAboutTract Map 1-44 Parcel 39 Hydrology Study Singh Residence7
REDLANDS CONSULTANTS & ASSOCIATES
HYDROLOGY STUDY
For:
31250 NICOLAS RD.
APN:957-090-019
Prepared for:
SOHAN & KULDIP SINGH
750 KIT CT.
TEMECULA, CA 92592
951.7570853
Prepared by:
REDLANDS CONSULTANTS&ASSOCIATES
621 S.BUENA VISTA ST.
OQ?,OFES8
REDLANDS,CA 92373
952.440.9227
w 8312 m
z I A
PREPARATION DATE:July 27,2017 F Civil-
CAL
1 SINGH HYDROLOGY REPORT
APN:957-0-019
TABLE OF CONTENTS
A. EXISTING SITE CONDITIONS-----------------------------------------------------------2
B. PROPOSED SITE CONDITIONS---------------------------------------------------------2
C. BASIS &ASSUMPTIONS---------------------------------------------------------------2
D. CALCULATIONS---------------------------------------------------------------------------3
E. SUMMARY&CONCLUSIONS----------------------------------------------------------3
F. REFERENCES-------------------------------------------------------------------------------4
G. ATTACHMENTS---------------------------------------------------------------------------5
i. Rational Method Calculation Table
ii. RCFC manual graphs and material.
iii. Tributary Areas Map and TOPO
iv. FEMA Map
v. Flood Control Maps
vi. SS-10 Caltrans Outlet Protection/Velocity Dissipation Devices
1
SINGH HYDROLOGY REPORT
APN: 957-0-019
A. EXISTING SITE CONDITIONS
The project is located at the NE corner of Nicolas Rd. and Calle Girasol in Temecula
California.The project consists of 4.03 Ac. with one mobile house and two barns.
There are two upstream areas that naturally drain onto the property.The first enters the
property from the northeast(Al) and the other crosses the property from east to west
within the southern half of the property(A2).
The drainage tributary to Al totals about 15 acre with rural single family development and
drainage from this area was analyzed using the Topographic maps provided by the county of
Riverside County Flood Control with date of preparation 01-09-2012.This area drainage
enters the property within the easterly 80 feet on the north side of the property and
continues through the property south west and exists the property at the southwest corner
and into the Long Valley Wash and continues westerly.
The area drainage of A2 was analyzed by reviewing flood maps provided by Riverside County
Flood Control (attached herein this report)and the original Parcel Map from which this
parcel was originally deeded.
B. PROPOSED SITE CONDITIONS
Through a new house development,the owners of this property are proposing to build a
single family house at the Northwest corner of the property away from the flood plain of A2
and away from the natural drainage from Al. The two barns will be demolished and the
existing mobile house will be moved out of the property.
C. BASIS AND ASSUMPTIONS
The 100-year frequency storm would be used for hydrology and hydraulics calculations for
the proposed development conditions.
We will use the assumption that all the upstream properties will be developed per the
existing zoning.
This hydrology study would determine the following:
The 100 storm-water flow through the property.
Design any required drainage facilities if any to protect the proposed structure and its
pad.
2
SINGH HYDROLOGY REPORT
APN: 957-0-019
D. CALCULATIONS
100-YEAR Peak Flow Rate (Quk300)
The calculation tables are included in the attachments
E. SUMMARY AND CONCLUSION
a. Area 1 will generate 26.7 cfs of storm-water passing through this property in a 100 year
storm. 26.7 cfs can be contained in a 30" cmp at 0.5%slope. However,this amount of
storm-water runoff will pass through the property and the only recommendation is to
protect the slopes of the elevated pad of the house with 4"-8" rock along the north and
easterly slopes of the pad,or through developing a paved interceptor which would
collect any storm-water that is directed to pad and carry the storm-water around the
pad and release it back onto the natural drainage.
From the site visit and the performed TOPO survey we discovered that upstream
property owners have diverted all the flows toward the northeasterly corner of the
subject property, and that was the reason the house pad was pushed as far
northeasterly to stay away from the natural drainage area. We also assumed that the
two concrete interceptors surrounding the pad might receive about''/.of the whole
tributary area and were designed accordingly.
Therefore,about 7cfs would be divided equally over the two swales giving each 3.5cfs
rounded up to 4cfs.Total 0,11 for each of the interceptor at the proposed slope (1%) is
8.3 cfs with a cross section area of 1.5 sf.4cfs=O.l1m3/s and from Caltrans reference
attached)a 3"-6" rock with a length of 10 feet,4 foot width and 1' deep would suffice
for protection.
b. We also took consideration to stay away from the natural drainage area. Eventhough,
the course flattens on our site and sheet flows southwesterly,we left a 30' wide area,
15'on either side of the lowest point(Flow line if there were one)and delineated such
on the grading plan.
c. Area 2,the flood plain from the Long Valley wash has been delineated on the original
Parcel Map from which this property was deeded (PM01-pages 45-47).The flood plain
boundaries have also been delineated on a newer Parcel Map contiguous easterly to
this property.The proposed house is located 154' away from the flood plain boundary
line.
3
SINGH HYDROLOGY REPORT
APN: 957-0-019
F. REFERENCES
a. Hydrology Manual, Riverside County, 1978.
b. Handbook of Hydraulics, E. Brater and H. King, 7`^edition.
c. Grading Plan as prepared by our firm.
4
SINGH HYDROLOGY REPORT
APN: 957-0-019
G. ATTACHMENTS
5
RCFC&WCD MANUAL
RATIONAL METHOD CALCULATION FORM
PROJECT: 31250 NICOLAS RD. CALCULATED BY: KHALED FARAH DATE: 7.27.2017
FREQUENCY:100 YR CHECKED BY:KHALED FARAH,PE DATE: 7.27.2017
DRAINAGE AREA SOIL&DEV
AREA I
C
C
Q' I Q SLOPE SECTION
L T >:T
REMARKS
ACRESI (In/Hr)S) FPS) (FT) (MIN) (MIN)
go 1000 12
A C IS 2.7 0.66 26.7 12 INITIALAREA
26.7 0.005 NATURALVALLEY 5.8 96 0.275862
B C 0 0 0 0.0
C C 0 0 0 0.0
B C 0 0 0 0.0
D C 0 0 0 0.0
E C 1 0 0 0 0.0
F C 0 0 0 0.0
TC' LIMITATIONS:
L 100 I. Maximum length = 1000'TC
1000 90 2. Maximum area = 10 Acres 5^
900 80 a
o0 H 6 0
800
70
v 500 u`
y 400 Q
a c $ 300
700 60 c > z00 72O
y
O
acr N E c 100 d
600 0 50 o c o 60 8 —Q.
50
C 30
35 0 d e 112 —u)
m n 6
K Ai f)400 30
Undeveloped O m 2GoodCoverwm35025Undevelopedc1.0
5 Fair Cover
0 - ;6 14
o E
c300 Undeveloped 15 d
290 Poor Cover O .. `
0- .p
2,
16
o F I7 Single milt' w 17 £
J
250
16
14 Acre)IB -
L 0
15 Commercial 0 „ 19 F
0
14 Pav o 20
c
m 200 13 0
12
25 0
0
c
KEY c
150 E 9 L- H Tc-K-Tc o
8
30
m
EXAMPLE: E
7 1) L =550', H =5.0, K=Single Family(1/4 Ac.) 35
Development ,Tc = 12.6 min.1100 6
2) L =550', H =5.0', K= Commercial 40
Development , Tc = 9.7 min.
5
4 Reference:Bibliography item No. 35.
R C F C & W C D TIME OF CONCENTRATION
HYDPOLOGY MANUAL FOR INITIAL SUBAREA
PLATE D-3
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STORMDURATION
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CALCULJ/iION
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RUNOFF INDEX NUMBERS OF HYDROLOGIC SOIL-COVER COMPLEXES FOR PERVIOUS AREAS-AMC II
Cover Type (3)Quality of Soil Group
Cover (2) A B C D
NATURAL COVERS -
Barren 78 86 91 93
Rockland, eroded and graded land)
Chaparrel, Broadleaf Poor 53 70 80 85
Manzonita, ceanothus and scrub oak) Fair 40 63 75 81
Good 31 57 71 78
Chaparrel, Narrowleaf Poor 71 82 88 91
Chemise and redshank) Fair 55 72 81 86
Grass, Annual or Perennial Poor 67 78 86 89
Fair 50 69 79 84
Good 38 61 74 80
Meadows or Cienegas Poor 63 77 85 88
Areas with seasonally high water table, Fair 51 70 80 84
principal vegetation is sod forming grass) Good 30 58 72 78
Open Brush Poor 62 76 84 88
Soft wood shrubs - buckwheat, sage, etc. )Fair 46 66 77 83
Good 41 63 75 81
Woodland Poor 45 66 77 83
Coniferous or broadleaf trees predominate. Fair 36 60 73 79
Canopy density is at least 50 percent) Good 28 55 70 77
Woodland, Grass Poor 57 73 82 86
Coniferous or broadleaf trees with canopy Fair 44 65 77 82
density from 20 to 50 percent) Good 33 58 72 79
URBAN COVERS -
Residential or-Commercial Landscaping Good 32 56 69 75
Lawn, shrubs, etc.)
Turf Poor 58 74 83 87
Irrigated and mowed grass) Fair 44 65 77 82
Good 33 58 72 79
AGRICULTURAL COVERS -
Fallow 76 85 90 92
Land plowed but not tilled or seeded)
R C F C a W C D RUNOFF INDEX NUMBERS
HYDROLOGY MANUAL FOR
PERVIOUS AREA
PLATE D-5.8 0 of 2)
RUNOFF INDEX NUMBERS OF HYDROLOGIC SOIL-COVER COMPLEXES FOR PERVIOUS AREAS-AMC II
Cover Type (3)Quality of Soil Group
Cover (2) A B I C D
AGRICULTURAL COVERS (cont.) -
Legumes, Close Seeded Poor 66 77 85 89
Alfalfa, sweetclover, timothy, etc.) Good 58 72 81 85
Orchards, Deciduous See Note 4
Apples, apricots, pears, walnuts, etc.)
Orchards, Evergreen Poor 57 73 82 86
Citrus, avocados, etc.) Fair 44 65 77 82
Good 33 58 72 79
Pasture, Dryland Poor 67 78 86 89
Annual grasses) Fair 50 69 79 84
Good 38 61 74 80
Pasture, Irrigated Poor 58 74 83 87
Legumes and perennial grass) Fair 44 65 77 82
Good 33 58 72 79
Row Crops Poor 72 81 88 91
Field crops - tomatoes, sugar beets, etc.) Good 67 78 85 89
Small Grain Poor 65 76 84 88
Wheat, oats, barley, etc. ) Good 63 75 83 87
Vineyard
See Note 4
Notes:
1. All runoff index (RI) numbers are for Antecedent Moisture Condition
AMC) II.
2. Quality of cover definitions:
Poor-Heavily grazed or regularly burned areas. Less than 50 per-
cent of the ground surface is protected by plant cover or brush
and tree canopy.
Fair-Moderate cover with 50 percent to 75 percent of the ground sur-
face protected.
Good-Heavy or dense cover with more than 75 percent of the ground
surface protected.
3. See Plate C-2 for a detailed description of cover types.
4. Use runoff index numbers based on ground cover type. See discussion
under "Cover Type Descriptions" on Plate C-2.
5. Reference Bibliography item 17.
R C F C a w C p RUNOFF INDEX NUMBERS
1YDROLOGY NIANUAL FOR
PERVIOUS AREA
PLATE D-5.5(2 of 2)
ACTUAL IMPERVIOUS COVER
Recommended Value
Land Use (1) Range-Percent For Average
Conditions-Percent(2
Natural or Agriculture 0 - 10 0
Single Family Residential: (3)
40,000 S. F. (1 Acre) Lots 10 - 25 20
20,000 S. F. (11 Acre) Lots 30 - 45 40
7,200 - 10,000 S. F. Lots 45 - 55 50
Multiple Family Residential:
Condominiums 45 - 70 65
Apartments 65 - 90 80
Mobile Home Park 60 - 85 75
Commercial, Downtown 80 -100 90
Business or industrial
Notes:
1. Land use should be based on ultimate development of the watershed.
Long range master plans for the County and incorporated cities
should be reviewed to insure reasonable land use assumptions.
2. Recommended values are based on average conditions which may not
apply to a particular study area. The percentage impervious may
vary greatly even on comparable sized lots due to differences in
dwelling size, improvements, etc. Landscape practices should also
be considered as it is common in some areas to use ornamental grav-
els underlain by impervious plastic materials in place of lawns and
shrubs. A field investigation of a study area should always be made,
and a review of aerial photos, where available may assist in estimat-
ing the percentage of impervious cover in developed areas.
3. For typical horse ranch subdivisions increase impervious area 5 per-
cent over the values recommended in the table above.
R C F C Ik W C D IMPERVIOUS COVER
HYDROLOGY MANUAL
FOR
DEVELOPED AREAS
PLATE D-5.6
RUNOFF COEFFICIENT CURVE DATA
The data in the following tables may be used to develop runoff
coefficient (C) curves for any combination of runoff index (RI)
number and antecedent mositure condition (AMC) . For an RI number
with an AMC of II (from Plate D-5.5) enter the tables on the
following pages and plot the "C" curve data directly on Plate
D-5.8. "C" curve data is given for even RI numbers only, but values
may easily be interpolated for odd RI numbers.
For an AMC of I or III enter the tabulation on this page with the
RI for AMC II, and read the appropriate RI for AMC I or III. Use
this revised RI to enter the tables on the following pages to deter-
mine "C". For example if RI = 40 for AMC II, then RI 22 for AMC I
and RI = 60 for AMC III.
AMC ADJUSTMENT RELATIONSHIPS
11 It* *I 1p OIKR *IF" Pt FOR 07WF
aW II •Mc cOM01110Ns1 A" 11 .NC cOM01tlOMI
e4 I AMC III AMC I •K III
1e -- It ss 19 T.
it -- 2•5a 16 /S
It — is st 11 1s
5a 18 16
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10 00 •I r1
la .. 1t of •I )a
11 11 of .t To
U .. 1.N •1 ee
to -- 14 e. .• at
to 11 05 •s at
tt Ie 10 as .• et
tt 11 19 7 •1 e1
21 I1 •1 as .a o•
i• it t N so o.
h 2 41 To sl s5
to R .•11 it ea
11 11 H ft s] as
za 1• 41 n s• at
z9 1• 49 55 ee
to IS se 15 SI as
11 16 sl 16 so e9
It R st 11 so 69
11 V 51 to 60 90
1. 1e 54 19 at q
is I$ ss as O 91
16 to s•el a• of
11 z1 sl at as 92
1e z1 a 41 et 91
19 zI » u as 91
4 1 zi ae as Ia 9•
1 to al es It o•
t t. at tl /1 9s
tl zs al U IS 9s
is a.N 1a 9a
s to aS 9e 14 99
ti H 91 sa 7
41 to at 92 a1 91
e 29 as 91 el 9e
N 10 N 9. 45 91
So 11 le 9S e) O
51 11 fo 96 a9 N
st 1t 11 1 91 90
s1 11 ft 9e o. 99
9• 14 71 99 91
R C F C a W C D RUNOFF COEFFICIENT
HYDROLOGY MANUAL CURVE DATA
PLATE D-5.7 (I of 12)
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