HomeMy WebLinkAboutSite Certifications - 12/22/2015Project Name: The Learning Experience at Miramont Office Park %�t0t/Q^1 / a—�—�.— ► o
Date: 12/18/2015 ' I�L
Building Permit Numbers: B1404509
(Commercial or multi -family)
Per the requirement in Fort Collins Stormwater Criteria Manual (FCSCM) Volume 1, Section 6.11, please fill in
all applicable items in this Certification Form for Commercial, Multi -Family and Overall Single Family sites.
NOTE: several items must be verified during construction. A copy of the approved grading plan must be
submitted with the as -built grading plan. (As -built elevations must be written in red next to the approved
elevations.)
• Use "Yes" for items completed as described.'
• Use "N/A" for items that are not applicable to the site being certified.
• If any blanks are "No," attach an explanation referencing the item number below.
Attach an explanation or description of the as -built condition for any items listed or for anything not listed but
shown on the approved construction plans.
Provide an as -built redline or Mylar drawing with the following:
I. Water Quality and Quantity Detention Basin Certification - FCSCM Vol.2, Ch.10
For multiple detention basins on a site, provide the following for each basin separately:
A. Volume: Yes As -built topographic verification is attached at 1-foot (or less) contour intervals and
volume verification calculations for the water quality capture volume and the 300-year detention storage
volume.
1, Yes Detention basin topography was prepared by a professional land surveyor registered in the state
of Colorado.
2. Yes Both proposed and as -built contours are shown on the same plan sheet (dashed lines for
proposed and solid lines for as -built).
3. Yes All critical spot elevations as shown on the approved construction plans have been verified and
the as -built elevations are shown on the plan sheet.
4, Yes Stage -storage -discharge tables are provided on a separate document.
5. No Verification that designed drain time is in compliance with Colorado Revised Statute § 37-92-
602(8) is attached and has been uploaded to the Statewide Compliance Portal
(tinvuri.com/COComaliancePortai) for approval. Uploaded documents must include:
a. The cover sheet from the approved drainage report
b. The stamped certification page from the approved drainage report
c. As -built topographic survey
d. Stamped certification page from the Overall Site & Drainage Certification
e. PDF output from the Stormwater Detention and Infiltration Design Data Speadsheet
12/15
Page 1
B. Water Quality and Quantity Detention Basin Grading: Yes Attached is as -built verification that there is
a minimum 2% positive fall into the concrete trickle pans or flow -lines) from all areas in the bottom of
the detention pond. If there is a "soft pad' in the flow -line, all areas still must meet the minimum 2%
grade requirement.
1. Low Flow: Choose one of the following detention basin low flow options as applicable:
a. N/A Turf swale for low flow path in detention basin.
There is a. minimum 2% grade in the flow-line(s) of the detention basin. The flattest as -built grade
is
b. Yes Concrete pan for low flow in detention basin.
There is a concrete pan installed that meets the grades as shown on the approved construction .
plans. (Show as -built spot elevations.)
c. N/A Soft pan for low flow in detention basin.
• Verify and document the soft pan material gradation, trench width and depth -to be verified
during construction by engineer. Picture documentation is preferred or engineers statement of
visual inspection and compliance. (Choose one below.)
o N/A There is a soft pan with an underdrain installed that meets the design on the approved
construction plans. (Show the underdrain grades, bedding material, geotextile, spot elevations,
bends, cleanouts, etc.)
o N/A There is soft pan installed without an underdrain but there is a type A or B soil. The soil
type must be documented by supplying verification from a registered professional geotechnical
engineer.
NOTE: Spot elevations are to be within 0.2 ft. +/-.
2. Side Slopes: Yes The as -built side slopes of the detention basin have been calculated and are shown.
Indicate the side slope with an arrow and a numerical value (e.g., 6.25:1). The maximum slope allowed
is 4:1. Small areas of 3:1 may be acceptable, but slopes steeper than 3:1 must be stabilized or re-
graded. Provide documentation if a variance was granted for steeper slopes during the design process.
3. Spillway Certification: The following items must be field verified:
a. Yes The location of the spillway is indicated on the as -built plan.
b. Yes The width of the spillway is indicated on the as -built plan.
c. Yes The elevation(s) of the spillway is shown on the as -built plan.
d. Yes A concrete ribbon defines the location and grade of the spillway.
e. No There is downstream scour protection in the spillway as per the construction plans. Indicate
type: Existing Condition (riprap size "D50" gradation and bedding type, geotextile, buried
riprap with inches of bury, etc.).
f. Yes There are no obstructions in the spillway, such as trees, bushes, sidewalks, landscape
features, rocks, etc.
12/16 Page 2
4. Outlet Structure Certification
a. Yes The orifice plate for the approved release rate is installed with the correct size and location of
the orifice.
b. Yes The orifice plate for the water quality outlet is installed with the correct hole size, number of
rows and columns of holes.
C. Yes The bottom hole on both the water quality and quantity outlets are at the bottom of the plate
so no water ponds in front of the plate.
d. Yes The well screen is the correct material and is installed as shown on the construction plans.
e. Yes ..100-year overflow grate elevation is 5000.89 . (Elev. A on detail D-46)
f. Yes The top elevation of the water quality capture volume is 4998.99 . (Elev. B on detail
D-46)
g, Yes Overflow grate is made of the correct material, has the correct bar spacing, is hinged at the
top and bolted at the bottom.
h, Yes The bottom of the outlet box has no obstructions or misalignments that will cause it to retain,
runoff water and is sloped at 2% towards outlet.
11. Channels/swales - FCSCM Vol.1, Ch.7, Sect.3&4
A. Capacity: N/A The as -built capacity of all the major channels and swales has been verified. They meet
or exceed capacity requirements shown in the approved drainage study for this project.
1. N/A All swales are located within the drainage easements as shown on the construction plans.
2. N/A Longitudinal slopes and side -slopes (cross -sections) have been verified. Design criteria requires
longitudinal slopes of 2%1min. (on vegetated swales) and side -slopes no steeper than 4:1 If these
criteria are not met, the certification engineer will write a justification and propose mitigation for each
instance or have the issues corrected. If variances to these criteria have previously been approved and
are shown on the construction plans, no justification is needed.
3. N/A As -built spot elevations on channels/swales are shown that correspond to spot elevations
shown on the approved construction plans.
4, N/A All permanent erosion control measures are installed as shown on the approved construction
plans (e.g., drop structures, riprap, TRMs, etc.). (Include pictures and verification of the materials used
as part of this verification.) .
5. N/A All pans, curbs, storm pipes or other appurtenances appropriately tie into each other in the
system. (Pictures at tie-in points suggested.)
6. N/A The minimum freeboard is provided for all channels and swales as shown on the approved
construction plans or as identified in the approved drainage study. (Show the freeboard provided on
the cross -sections as on the construction plan set or attached as separate documentation.)
7. N/A The low flow portion of all channels or swales is clear of obstructions. (No landscaping, trees,
shrubs, sod, etc..infringe on the low flow portion of channels or swales.)
12/15 Page 3
I
III. Storm Pipes (aka storm drains) - FCSCM Vol.1, Ch.6, Sec. 4
A. Storm Drain Pipe Capacity: Yes The as -built capacity of all pipes installed on this project has been
verified and meets or exceeds the capacity requirements shown in the approved drainage study for this
project.
1. Yes All storm drainpipe sizes and.materials have been verified and are in conformance with the
approved construction plans. (Indicate on the plan and profile sheets that they have been verified.)
Material and size substitutions must be approved prior to installation. If a pipe size or material was
changed during construction, the certification engineer must attach the approval documents or supply
them with this certification. Approval documents must include a calculation documenting the capacity
equivalency (equal or greater) of the substituted size.
2. Yes The longitudinal slope of the pipe is as shown on the approved construction plans. The
acceptable minimum slope is 0.4%. All slopes flatter than the designed slope on the construction plans
must be justified with capacity calculations on an attached sheet.
3, Yes The as -built invert elevations have been verified and are shown on the plan and profile sheets of
the approved construction plans.
B. Storm Drain Pipe Installation Requirements: Yes All pipes are installed in accordance with the
approved construction plans.
1. Yes The minimum cover requirements for all pipes have been met as shown on the approved
construction plans. These will be called out in critical locations.
2. Yes All encasements and clearances as specified on the approved construction plans have been met.
-- - i - 3,-Yes Any specific joint types or construction methods specified on the approved construction plans
have been met. (List on a separate sheet and attach to this certification.)
IV. Concrete Pans - FCSCM Vol.1, Ch.7, Sec.4.1.3.4
A. Construction/Installation: N/A All concrete pans have been constructed in accordance with the
approved construction plans.
1. N/A The concrete pans are the correct size/width as shown on the approved construction plans.
2. N/A The longitudinal slopes of the pans are as shown on the approved construction plans. The
certification engineer must justify or mitigate longitudinal slopes less than the minimum of 0.4% unless
a flatter slope was approved and is shown on the approved construction plans. Provide mitigation or
justification by separate document.
3. N/A The cross-section of the pan is as shown on the construction plans. (Specifically, the pan cross-
section is "V" shaped and meets the side slope shown on the detail.)
4. N/A The concrete pans are a minimum of 6 inches thick without reinforcement and a minimum of 4
inches thick with a minimum of 6X6-W14xW14 reinforcement per detail D20B and D20C. (Provide
documentation of the reinforcement used if different than shown on the details or on the approved
construction plans.)
5. N/A The spot elevations shown on the concrete pan(s) have been verified and are shown on the as -
built drawings.
12115 Page 4
V. Storm Drain Inlets - FCSCM Vol.1, Ch.6, Sec. 3
A. Construction/Installation: Yes All storm drain inlets have been constructed in accordance with the
approved construction plans.
1. Yes The size and type of inlets are consistent with the inlets shown on the approved construction
plan. Indicate by writing "Verified" on each inlet on the plan sheet or list on a separate document the
inlet number(s), type and size (length). If the inlet installed is other than the one on the approved
construction plan detail sheet, provide the name and source of the detail with justification for equal or
better capacity.
2. Yes The size of the inlet opening is consistent with the approved detail. (Check height and width.)
3. Yes The elevation of the grate (if applicable) is at the elevation shown on the street profile or as
indicated by a spot elevation on the construction plans.
4, Yes The as -built invert elevations of all pipes entering and leaving the inlet are shown on the plan
and profile sheets within construction tolerance of 0.2 feet. If substantially different, provide
justification and capacity calculations to show the capacity is not affected or propose mitigation.
5, Yes The as -built size of the inlet box is.as shown on the construction plans or an explanation or
justification is attached.
6. Yes All inlet covers are stenciled or stamped with the following designation: NO DUMPING =.DRAINS
TO 29415RE RIVER.
VI. Culverts - FCSCM Vol.2, Ch.9
A. Construction/Installation: NIA All culverts have been constructed and/or installed in accordance with
the approved construction plans.
1. N/A All culvert sizes have been verified as indicated on the as -built construction plans as correct.
2. N/A The culvert material type for all culverts installed is as on the approved construction plans and is
indicated on the as -built plans.
3. N/A The as -built invert "in and out" elevations have been verified and are indicated on the as -built
construction plans.
4. N/A The culvert headwalls or wing walls have been installed as shown on the approved construction
plans. Headwalls or wing walls may be needed in the as -built conditions onsite if the slopes adjacent to
the culvert are greater than 4:1. Please note areas needing stabilization in the certification narrative.
An alternative to consider is a turf reinforcement mat (TRM).
Vll. Sub -Drains
A. Construction/Installation: N/A All sub -drains shown on the construction plans have been installed in
accordance with those plans. Sub -drains installed with the sanitary sewer are to be verified on the
sanitary sewer plan and profile sheets of the construction plans. (NOTE: Indicate any sub -drains installed
after the plans were approved on the as -built plans.)
1. N/A The size of the sub -drains are as approved on the construction plans and are indicated on the as -
built plans.
2. NIA The type of sub -drain, in particular the perforated and non -perforated sections of the drain, are
as indicated on the approved construction plans.
12/15 Page 5
3. N/A The cover requirements per the construction plans are provided.
4. N/A The cleanouts have been installed at the locations shown on the construction plans and are
accessible for cleaning. (Cleanouts can be buried a maximum of 6 inches deep with their locations
marked.)
5. N/A The backfill materials for sub -drains are as shown on the approved construction plans. (This
includes the type, depth and width.)
6. N/A The geo-textile liner completely wraps the sub -drain and the permeable backfill material unless
shown otherwise on the approved construction plans. (Sub -drain pipe wrapped in a sock filter material
is accepted only if approved prior to installation.)
Vill. Curb Cuts
A. Construction: N/A All curb cut openings are constructed in accordance with the approved construction
plans.
1. N/A The size (width) of the curb cut opening is as shown on the approved construction plans.
2. N/A The curb cut openings tie into a downstream swale, pipe, or other appurtenances with a smooth
transition and there no.obstructions such as riprap or sod impeding the flow downstream of the curb
cut.
IX. Sidewalk Culverts & Chases
A. Construction/Installation: N/A All sidewalk culverts have been installed at the locations shown on the
approved construction plans.
1. N/A The size (width and length) I f the culverts are as shown on the approved construction plans.
2.' N/A The cover plate is a minimum 5/8-inch galvanized plate bolted to a galvanized angle iron per the
detail shown on the approved construction plans or per the City's detail.
3. N/A The sidewalk culvert invert "in and out" elevations have been verified and are indicated on the
as -built plans.
4. N/A The sidewalk culvert opening is as shown on the approved construction plans or per the City's
detail.
5. N/A There is a smooth transition both on the inlet and outlet ends of the sidewalk culvert with no
obstructions such as riprap or sod impeding the flow into or out of the sidewalk culvert.
X. Site Gradine
A. Construction: Yes All common open spaces have been graded in accordance with the approved
construction plans.
1. Yes The grading on all common open spaces bordering private lots has been verified as correct and
the as -built rear lot corner elevations have been shown on the as -built plans.
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Page 6
2. N/A The as -built contours for "overlot grading" are shown on the as -built construction plans for all
common open spaces, tracts, outlots, etc. If not in compliance, please attach a narrative describing the
situation for noncompliance and when it may be corrected. An escrow for overlot grading may be
required. (NOTE: Residential Lot Grading Certification is a separate process from this Overall Site
Certification. It is understood that residential lots will be brought to final grade once the foundation is
backfilled so they may be lower than the plan shows at this Overall Site Certification stage.)
3. N/A All turf reinforcement mats (TRMs) have been installed as shown on the approved construction
plans and the slopes are stabilized.
XI. Riprap - FCSCM Vol.l. Ch.7, Sec.4.4.4.3
A. Construction: NIA All riprap has been installed in the locations and sizes indicated on the approved
construction plans.
XII. Permanent Erosion Control Fabric - FCSCM Vol.1, Ch.7
A. Construction: NSA All fabric has been installed in the locations and sizes indicated on the approved
construction plans.
1. NSA All fabric was installed per the details on the approved construction plans.
XIII. Post -Construction Site Cleanup —FCSCM Vol.3. Ch.7
A. Construction: Yes All construction debris and obstructions of any kind have been removed from
drainage paths.
1. Yes All construction debris has been removed except in staging area(s).
2, Yes All ruts have been smoothed out in all construction areas.
3. Yes All areas needing reseeding have been identified and future stabilization goals have been
coordinated with the Erosion Control Inspector and in accordance with FCSCM Vol.2 Chapter 12. Note
the area needing stabilization in the narrative.
XIV. Certification of Other Permanent BMPs - FCSCM Vol.2, Ch.8. Sec.2 & FCSCM Vol.2, Ch.12
A. NIA The construction of channel dropstructures is in accordance with the approved plan both in
location, horizontal dimensions and cross-section.
XV. Certification of LID and Water Quality Facilities - FCSCM Vol.3, Ch.4
A. NSA Attached are the During Construction Inspection Checklist for Low Impact Development (LID) and
other items to be verified during construction, along with pictures and other required_ documentation.
12/15 Page 7
XVI. Certification and Erosion Control Measures
A. All temporary erosion control measures shall be removeduponstabilization. If at the time of preparing
this certification there are any erosion control measures still remaining on the site, please note them in
the narrative and verify that they need to remain at this time. If in doubt as to the need for any control
measure, please consult with the Erosion Control Inspector at 970-221-6700.
XVII. Statement of Compliance
A. This certification is signed and stamped. By signing this form, the engineer(s) attests that he/she has
visited and observed the site, and to the best of his/her knowledge, the as -built conditions of the drainage
facilities are as described in the above form and in the enclosed as -built plans.
B. Failure to properly disclose all known information could result in the rejection of this certification and
prevent the release of any and all Stormwater Utility permit holds on Building Permits and/or Certificates
of Occupancy within this development.
XVIII. Signature and Stamp by a Colorado -Registered Professional Engineer.
Engineer's contact information:
Name: Mark Cevaal v
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Email: mcevaal@redland.com .O
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Phone: 720-283-6783 O�• �21►��' �.�
Company: Redland cc�sSpLS•:`
Address:8000 S. Lincoln St., Suite 206
Littleton, CO 80122 PE Stamp
Sign and date
Fort Collins
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12115
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Page 1
(it)
Dmg Area
Incr Total
(ac) (ac)
Rnoff
coeff
(C)
Area x C
Tc
Rain
(1)
(in/hr)
Total
Flow
(cfs)
Cap
full
(cfs)
el
(ft/s)
Pipe
Invert Elev
HGL Elev
Grnd / Rim Elev
Line ID
yslatlonLLen
Incr
Total
InletSyst
).
Size
(in)
Slope
(%)
Dn
(it)
Up
M
Dn
(it)
Up
(it)
Dn
(ft)
Up
(ft)
1
End
136.09C
0.00
0.00
0.00
0.00
0.00
0.0
0.0
-0.0.
13.96
13.71
4.44
24
0.37
4997.83
4998.33
5000.90
5001.42
5001.80
5003.20
Project File: New.stm 100-YR FLOW, STM INLET 1-2 TO POND
Number of lines: l
Run Date: 12/17/2015
NOTES:Intensity = 127.16 / (Inlet time + 17.80) A 0.82; Return period =Yrs. 100, ; c = cir e = ellip b = box '
S. �.100
Hydraulic Grade Line Computations
Page 1
Line
Size
(in)
G
(cfs)
Downstream
Len
(h)
Upstream
Check
JL
Minor
loss
(ft)
Invert
elev
(ft)
HGL
elevhead
(tt)
Vol
(ft/s)
Vol
(ft)
EGL
elev
(11)
Sf
(%)
Invert
elev
(tt)
HGL
elev
(ft) (ft)
Depth
Area
(sgft)
Vol
(ft/s)
Vol
head
IN
EGL
elev
IN
Sf
N
Ave
Sf
(%)
Enrgy
loss
(ft)
coeff
(K)
1
24
1396
4997,83
T003.14
4.44
SE I
031
PO
500121
D
0.381
136.09
4998.33
500142
2.00
314
4.44
031
5001.73
0381
0381
0.519
L00
0.31
5000.90
SET
Project File: Newstm 100-YR FLOW, STM INLET 1-2 TO POND
Number of lfnea: i
ftun Dete: 12/17/2015
c = cir e = ellip b = box
SI.—sawe 0040
Storm Sewer Profile Proj.file: New.slm
E lev.(ft)
5010.00
a�
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5007.00
MIN
00
5004.00
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INIIIIIIIIIIIIIII
5001.00
00
4998.00
00
499500
�.00
0 10 20 30 40 50 60 70 80 90 100 110 120 130 140
HGL EGL
Reach (fl)
..
n
Y
,
Storm Sewers
Storm Sewer Tabulation
Page 1
Station
Len
Itt)
Dmg Area
Incr Total,
(at) (ac)
Rnoff
coeff
(C)
Area x C
7c
Rain
11)
(in/hr)
Total
Flow
(cfs)
Cap
full
(cfs)=
Val
(R/s)
Pipe
Invert Elev
HGL Elev
Grnd / Rim Elev
Line ID
Line
7o
Lino
Incr
Total
Inlet
(min)
Syst
(min)
Size
Slopo
Dn
Up
(Fl)
Dn
(R)
Up
(Fl)
Dn
(n)
Up
(it)
1
End
76.490
0.00
0.00
0.00
0.00
0.00
0.0
0.0
0.0
1.83
1.47
2.63
12
0.17
4996.76
4996.89
4997.55
4997.77
5000.71
5000.89
Project File: New.stm 100-yr from Pond 10 STM MH 1-1
Number of lines: l
Runbate: 12/18/2015
NOTES:Intensity = 88.24 / (Inlet time + 15.50) " 0.83; Retum period =Ym. 10 ; c = cir e = ellip b = box -
Strom Seen M 40
Hydraulic Grade Line Computations
Page 1
Line
Size
(in)
D
WS)
Downstream
Len
(ft)
Upstream
Check
JL
Minor
loss
Iftl
Invert
elev
(ft)
HGL
elev,
(ft)
Depth
(ft)
Area
(stift)
Val
(Ws)
Val
head
(ft)
EGL
elev
(ft)
Sf
N
Invert
elev
(ft)
HGL
elev
(ft)
Depth
(ft)
Area
(stilt)
Vol
(ft/s)
Vol
head
(ft)
EGL
alev
(a)
St
N
Ave
Sf
N
Enrgy
loss
(ft)
coeft
(K)
1
12
1.83
4996.76
4997.55
0.79
0.66
2.76
0.12
4997.67
0.286
76.490
4996.89
4997.77
0.88
0.73
2.50
0.10
4997.87
0.238
0.262
0.200
1.00
1
0.10
Project File: New.stm 100-yr from Pond to STM MH 1-1
Number of lines: l
Run Date: 12/1812015
c=cir a=ellip b=box
Sri Sew AO40
Storm Sewer Profile
Proj. file: New.stm
Elev. (ft)
5009.00
U o
o�
OOg
Ppm
O9WO
B >
O
J Om
m Op
f pY
WW
5009,00
5006.00
6006.00
5003.00
5003.00
5000.00
5000.00
4997.00
— —
— —
4997.00
4994.00
— 4994.00
0 10 20 30 40 50 60 70 80 90 100
HGL EGL
Reach (ft)
Storm Sewers
Storm Sewer Tabulation
Page 1
Station
Len
IH)
Dmg Area
Incr Total
(acl (ac)
RnoH
coeH
(CI
Area x C
Tc
Rain
11)
pNhr)
Total
Flow
(cfs)
Cap
full
(cts)
el+
(Ws)
Pipe
Invert Elev
HGL Elev,
Gmd I Rim Elev
Line ID
Line
7o
Line
Incr
Total
Inlet
(min)
Syst
(min)
Size
(in)
Slope
(%)
Dn
IHI
Up
(H)
Dn
(H)
Up
lHl
Dn
(it)
Up
(it)
1
End
136.09C
0.00
0.00
0.00
0.00
0.00
0.0
0.0
0.0
3.75
13.71
2.20
24
0.37
4997.83
4998.33
4999.17
4999.23
5001.80
5003.20
Project File: New.stm 10-YR STM INLET 1-2 TO POND
Number of lines:I
Run Date: 12J172015
NOTES:Intensity = 88.24 / (Inlet time t 15.50) A 0.83; Return. period =Yrs. 10 ; c = cir e = ellip b = box
Strom Seven v1040
Hydraulic Grade Line Computations
Page 1
Line
Size
(in)
G
(CIS)
Downstream
Len
(it)
Upstream
Check
JL
Minor
loss
Iff)
Invert
elev
(ff)
HGL
elev
(it)
Depth
lit)
Area
(stiff)
Vel
(H/s)
Vol
head
III)
EGL
elev
(ff)
Sf
N
Invert
elev
(ff)
HGL
elev
(it)
Depth
(it)
Area
Is9H)
Vel
(we)
Vol
head
(it)
EGL
elev
(it)
Sf
N
Ave
Sf
M
Enrgy
loss
(ff)
coeH
(K)
1
24
3.75
4997.83
4999.17
1.34
2.24
1.68
0.04
4999.21
0.044
136.09
4998.33
4999.23
0.90
1.38
2.73
0.12
4999,35
0.157
0.101
0.137
1.00
0.12
Project File: New.stm 10-YR STM INLET 1-2 TO POND
Number of lines:l
Run Date: 12/172015
c=cir a=ellip b=box
Storm Se 0e40
Storm Sewer Profile
Proj. file: New.stm
Elev. (fl)
501000
a c
�'Om
A
O YOi�
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4U W
ovW
MOE
5
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5010.00
5007.00
5007M
5004.00
5004.00
5001.00
5001.00
4998 00
4993.00
4995.00
4995.00
0 10 20 30 40 50 50 70 50 90 100 110 120 130 140
HGL - EGL
Reach (ft)
Stormwater Detention and Infiltration Design Data Sheet
Stormwater Facility Name: The Learning Experience at Miramont Office Park
Facility Location & Jurisdiction: Boardwalk Drive and Oakridge Drive, Fort Collins, CO
User (Input) Watershed
Watershed Slope=
Watershed Length -to -Width Ratio=
Watershed Area =
Watershed Imperviousness =
Percentage Hydrologic Soil Group A=
Percentage Hydrologic Sol[ Group B =
Percentage Hydrologic Soil Groups C/D =
Characteris
0.020
1.00
3.65
68.8%
0.0%
0.0%
100.0%
User Input: Detention Basin Characteristics
WQCV Design Drain Time= 40.00 hours
After completing and printing this worksheet to a pdf, go to:
https://maperture.dlgltaidatasemices.com/gvh/?viewer=cswdif,
create a new stormwater facility, and
attach the pdf of this worksheet to that record.
Design Storm Return Period -
Two -Hour Rainfall Depth =
Calculated Runoff Volume -
OPTIONAL Override Runoff Volume =
Inflow Hydrograph Volume =
Time to Drain 97%of Inflow Volume -
Time to Drain 99%of Inflow Volume =
Maximum Ponding Depth =
Maximum Ponded Area -
Maximum Volume Stored -
Routed Hvdrneranh Results
User Defined
Stage[ft]
User Defined
Area la"21
User Defined
Stage(ftl
User Defined
Discharge[cfs]
0.00
0
0.00
0.03
0.50
1,700
0.50
0.03
1.00
3,396
1.00
0.03
1.50
4,786
1.50
0.03
2.00
6,177
2.00
0.03
2.50
6,368
2.50
0.34
3.00
6,575
3.00
0.53
390
6,923
3.90
0.77
4.00
6,967
4.00
1.60
5.00
7,747
5.00
1.73
5.59
11,541
5.59
1.83
6.30
11,541
6.30
2.00
&60
11,541
6.60
32.35
WQCV
2Year
5Year
10 Year
25 Year
50 Year
100 Year
0.53
0.98
1.36
1.71
2.31
2.91
3.67
0.081
0.200
0.309
DA12
0.599
0.778
1.020
0.080
0.199
0.308
0.411
0.599
0,778
1.020
31
65
66
67
66
65
64
32
66
69
70
71
72
72.
1.41
2.25
2.84
3.42
4.28
5.14
5.99
0.303
0.1441
0.149 1
0.155
1 0.165
0. 198
0.265
0.075
0.1631
0.270
1 0.357
1 0.495
0.645
0.856
n
acre -fit
acre -fit
acre ft
tours
lours
R
3Cre5
cre-ft
Design Data 12/22/2015, 11:40 AM
Stormwater Detention and Infiltration Design Data Sheet
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�100YR IN
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�SOYR IN
25
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25YR IN
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20
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u
-
••••• SYR OUT
-
—2YR IN
- - - 2YR OUT
30
WON IN
-
••••^ WON OUT
_
5
0 In
0A
T
B
5
G
4
z
z
C
i
Sy
2
1
0
0.1
-.-
ia-T. �' — _ -- ��RI`Rr'RRrTRR�hxRAR�rJPitTwSJ?li.
1 10
TIME [hr)
1 10
DRAIN TIME [hr]
100
Design Data 12/22/2015, 11:40 AM