HomeMy WebLinkAboutSite Certifications - 04/25/2018Project Name: Uot€. 2.. Stsr€.s
Date:
Building Permit Numbers:_
(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 100-year detention storage
volume. NO D7 ) t.v*1e .J 0t.
1.YES Detention basin topography was prepared by a professional land surveyor registered in the state
of Colorado.
2.'1S Both proposed and as-built contours are shown on the same plan sheet (da;hcd lines for
proposed and e4s&lines for as-built).
3.'IS 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.P4/A Stage-storage-discharge tables are provided on a separate document.
5.N/A 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
(tinyurl.com/COCompliancePortal) 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: N/A Attached is as-built verification that there is
a minimum 2% positive fall into the concrete trickle pans or flow-line(s) from all areas in the bottom of
the detention pond. If there is a "soft pan" 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.______ 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 Dto'vre'.nj *bAslr4 is R..AT.
b.t4 IA 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. MIA Soft pan for low flow in detention basin. 10
• Verify and document the soft pan material gradation, trench width and depth - to be verified
during construction by engineer. Picture documentation is preferred or engineer's statement of
visual inspection and compliance. (Choose one below.)
o YS 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 _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. +1-.
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.YE5 The location of the spillway is indicated on the as-built plan. Cb tDt....JAL.% Ct41M
b.!1CS The width of the spillway is indicated on the as-built plan. (si Ora .AL%c. CPA.)
c.)S The elevation(s) of the spillway is shown on the as-built plan.
d.i4/A A concrete ribbon defines the location and grade of the spillway.
e.jkJ& There is downstream scour protection in the spillway as per the construction plans. Indicate
type: il/A (riprap size "D50" gradation and bedding type, geotextile, buried
riprap with t4 /A inches of bury, etc.).
f.YES There are no obstructions in the spillway, such as trees, bushes, sidewalks, landscape
features, rocks, etc.
12/15 Page 2
4. Outlet Structure Certification
a.141A The orifice plate for the approved release rate is installed with the correct size and location of
the orifice.
b.Pt/A The orifice plate for the water quality outlet is installed with the correct hole size, number of
rows and columns of holes.
c.____ 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.______ The well screen is the correct material and is installed as shown on the construction plans.
e.4/6, 100-year overflow grate elevation is M (A . (Elev. A on detail D-46)
f.YS The top elevation of the water quality capture volume is 1( .5O . (Elev. Bon detail
D-46)
g.blIA Overflow grate is made of the correct material, has the correct bar spacing, is hinged at the
top and bolted at the bottom.
h.,4/A 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.
II. Channels/Swales - FCSCM Vol.1, Ch.7, Sect.3&4
A. Capacity: Yes 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.Yc All swales are located within the drainage easements as shown on the construction plans.
2.Longitudinal slopes and side-slopes (cross-sections) have been verified. Design criteria requires
longitudinal slopes of 2% mm. (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.
3.1E5 As-built spot elevations on channels/swales are shown that correspond to spot elevations
shown on the approved construction plans.
4.1E.S 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.YES All pans, curbs, storm pipes or other appurtenances appropriately tie into each other in the
system. (Pictures at tie-in points suggested.)
6.Y&.s 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.)
7.4 .S 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
Ill. Storm Pipes (aka storm drains) - FCSCM Vol.1, Ch.6, Sec. 4
A. Storm Drain Pipe Capacity: N/A. 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.N/A. All storm drain pipe 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.N/A 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.
?4fA 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: All pipes are installed in accordance with the
approved construction plans.
1.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.
2.1ifA All encasements and clearances as specified on the approved construction plans have been met.
3.14/iA. 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: YES All concrete pans have been constructed in accordance with the
approved construction plans.
1.fS The concrete pans are the correct size/width as shown on the approved construction plans.
2.(O 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.Y5 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.VS 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.VS The spot elevations shown on the concrete pan(s) have been verified and are shown on the as-
built drawings.
12/15 Page 4
V. Storm Drain Inlets - FCSCM Vol.1, Ch.6, Sec. 3
A. Construction/Installation: Y6 S All storm drain inlets have been constructed in accordance with the
approved construction plans. t'D6.4A- CV,IS$
1.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.'fE5 The size of the inlet opening is consistent with the approved detail. (Check height and width.) I
3.11/A 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.N /A 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.ALA The as-built size of the inlet box is as shown on the construction plans or an explanation or
justification is attached.
6.7A All inlet covers are stenciled or stamped with the following designation: NO DUMPING - DRAINS
TO POUDRE RIVER.
VI. Culverts - FCSCM Vol.2, Ch.9
A. Construction/Installation: e S All culverts have been constructed and/or installed in accordance with
the approved construction plans. C.WlBS
1./ç All culvert sizes have been verified as indicated on the as-built construction plans as correct.
2.fEc The culvert material type for all culverts installed is as on the approved construction plans and is
indicated on the as-built plans. 5 )D&A '..'l'
3.______ The as-built invert "in and out" elevations have been verified and are indicated on the as-built
construction plans.
4.______ 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).
VII. Sub-Drains
A. Construction/Installation: YS 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.YE.S The size of the sub-drains are as approved on the construction plans and are indicated on the as-
built plans.
2.16 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.YES 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.(&S The backfill materials for sub-drains are as shown on the approved construction plans. (This
includes the type, depth and width.)
6.1&S 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.)
VIII. Curb Cuts
A. Construction: ____ All curb cut openings are constructed in accordance with the approved construction
plans.
1.M/.4 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: YE' All sidewalk culverts have been installed at the locations shown on the
approved construction plans.
1.Y615 The size (width and length) of the culverts are as shown on the approved construction plans.
2.'16S 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.
. es The sidewalk culvert invert "in and out" elevations have been verified and are indicated on the
as-built plans.
4.YST The sidewalk culvert opening is as shown on the approved construction plans or per the City's
detail.
5.'fS 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 Grading
A. Construction: '1S All common open spaces have been graded in accordance with the approved
construction plans.
1. 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.
12/15 Page 6
2.yes 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.R/,& All turf reinforcement mats (TRM5) have been installed as shown on the approved construction
plans and the slopes are stabilized.
Xl. Riprap - FCSCM Vol.1, Ch.7, Sec.4.4.4.3
A. Construction: ?EJ 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: 1ES All fabric has been installed in the locations and sizes indicated on the approved
construction plans.
1. 'jec All fabric was installed per the details on the approved construction plans.
XIII. Post-Construction Site Cleanup - FCSCM Vol.3, Ch.7
A. Construction: 'ies All construction debris and obstructions of any kind have been removed from
drainage paths.
1.y5 All construction debris has been removed except in staging area(s).
2.'tES All ruts have been smoothed out in all construction areas.
3.'es 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. /4/A The construction of channel drop structures 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.YC-5 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
Engineer's contact information:
Name:
EmaiI:tLt.
Phone: 97D .I. 9 98S
Company: c 3 U.C...
Address: 2 o r. to LL E 6 & J six I D
FoA1- O LLA pJ A 1 CD 8 ocz..c PE Stamp
Sign and date
XVI. Certification and Erosion Control Measures
A. All temporary erosion control measures shall be removed upon stabilization. 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
City of
Fort Collins
12/15 Page 8
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Date: 42f F8 Subdivision:
Address: Permit Application #:
Larimer County Parcel #:
Lot
Block: Larimer County Reception #:
(on development agreement)
I, (print) 1Trva77+'ç 3 Aç -LALoQ Ee , a Colorado registered professional engineer, verify that construction
of all stormwater facilities and grading is complete and hereby submit this certification.
Please answer the following questions by initialing the appropriate response. For each question initialed "No," attach an
explanation detailing how this will affect stormwater drainage for this lot and any adjacent lots.
1.Certification includes attached Storm wate r-a pproved grading plan. (NOTE: City's No Yes 114
Building Department does not approve grading plans).
2.Certification includes the attached as-built survey dated 't IIS(must be within 60 No Yes _T=V
days of the date the certification is submitted) accurately and truthfully depicting
elevations for:
• Top of foundation/finished floor
• Finished grade on each side of the structure
• Quarter points along each lot line (not more than 50 feet apart)
• Break points/high points
• Swales
• Berms
• Retaining walls
• Air conditioning pads
• Window wells
• Any other appurtenance(s) within an easement
3.All elevations are within a 0.2 foot tolerance of the approved grading plan.
4.The top of foundation is at least 6 inches above the highest grade surrounding the
structure.
S. There is a minimum grade of 5% away from the structure within the first 5 to 10 feet
adjacent to the residence.
6.All slopes meet or exceed the minimum requirement of 2% (1% is acceptable on single
family lots when the swale is draining the runoff from only two adjoining properties)
and are not steeper than 25% (4:1).
7.All flow lines of stormwater drainage swales area minimum of 6 inches below the
elevation of ground adjacent to the structure and will direct drainage as shown on the
Storm water-approved grading plan.
8.All downspout locations and discharge directions are shown on the as-built survey.
Runoff is directed into an appropriate drainage system or lot line swale, and it is not
directed onto neighboring properties.
5 26 16
No 11)4 Yes
No Yes 1fl4
No Yes T4
No Yes 7134
No 74 Yes
No -Yes TI4
Page 1
9.A smooth transition with no vertical offset (step) in grade is provided at the lot line to all No Yes 171114
adjacent properties.
10.The grading of this lot does not adversely affect neighboring properties or City No Yes T4
infrastructure.
11.Landscaping has been completed prior to survey. If not, please indicate who will be No Yes
responsible for completing landscaping:
12.Final site cleanup has been completed. No - Yes TH
13.I personally visited the site as part of the certification process, and in my professional No _____ Yes TTW
opinion, the as-built survey is an accurate representation of the site conditions.
14.Based on this information, I certify that (check one):
El The elevations and drainage patterns of the lot/site are in substantial conformance with the City
approved drainage and grading plan for the property (information attached).
The elevations and drainage patterns of the lot/site as measured are in general conformance with the
City approved drainage plan with exceptions (information attached). In my professional judgment the
elevations and grading of the lot/site as constructed are functionally adequate and equivalent to the
specifically approved drainage plan, and will affect stormwater drainage on and off the lot/site in a
manner consistent with the approved drainage plan.
io 37953
S. ••• •
'ONAL 7
PE Stamp
Sign and date
Name:7t.mOfl.- J. ALPFF, P P. I CFM
Email: I'PPj
Phone: 1 70.19t,
Company: J i
Address: 2dD S. oG& AVZ jrE. 36
'r C.o &.SLI Lb Rorls -
NOTE: A complete certification must be submitted at least two weeks prior to a request for a Certificate of Occupancy
for the lot/site, including, but not limited to, drawings of the lot/site showing the approved design and as-built surveyed
elevations of all structures, drainage and grading features, written information/explanation of discrepancies, and other
information necessary to confirm the above certification to:
Email (preferred)
WaterUtilitiesEng@fcgov.com
Mailing Address
Fort Collins Utilities
ATIN: Water Utilities Engineering
281 North College Avenue
Fort Collins, CO 80521
Questions?
970-221-6700
City of
Fort Collins
52616 Page
7200 South Alton Way, Suite C400
Centennial, CO 80112
303-740-9393 x Fax 303-921-7320
3930 Sinton Road, Suite 219
Colorado Springs, CO 80907
719-593-2593 x Fax 303-921-7320
X 2900 South College Avenue, Suite 3D
Fort Collins, CO 80525
970-491-9888 x Fax 303-921-7320
MEMORANDUM
To:City of Fort Collins, Bldg Dept.
From:Tim Halopoff, PE, CFM
Date:4-24-2018
Subject:Home2 Suites – Drainage Certificate Supplement
Non-Impacting Drainage Items
Certification of Lot Grading - Supplement
3.Not all elevations are within 0.2’ of the approved grading plans, but the drainage intent has been met
without impacts to adjoining properties.
7.Concrete Drainage Pan on the north side of the building in the skinny planter area has a flowline less
than 0.5’ below finished floor, but the area draining to the pan is mere square feet, the drainage intent has been
met and should have no negative impact on the site drainage.
Overall Site and Drainage Certification - Supplement
IV-Concrete Pans, #2. For short distances of the Concrete Drainage Pan on the north side of the building in the
skinny planter area, the longitudinal slope of the pan is less than 0.4%. The pan maintains positive slope all the
way to its discharge point in the parking lot, the drainage intent has been met and should have no negative
impact on the site drainage.
Potentially Impacting Drainage Items (Home2 Suites Items to Address)
Areas of Concern
1.On Page 5 of the site photos (attached), it may be seen that the permeable pavers immediately adjacent
to the Texas Roadhouse gutter line have settled, leaving a 1” or more lip that may be a tripping hazard, and will
ultimately result in further subsidence given vehicular traffic. Recommend resetting first few rows of pavers
with additional gravel/sand bedding.
2.On Page 5 of the site photos (attached), it may be seen that the curb return on the southeastern-most
portion of the project, on the Cinemark property, has subsided and created a ponding area. Recommend rework
of curbline to flow easterly.
7200 South Alton Way, Suite C400
Centennial, CO 80112
303-740-9393 x Fax 303-921-7320
3930 Sinton Road, Suite 219
Colorado Springs, CO 80907
719-593-2593 x Fax 303-921-7320
X 2900 South College Avenue, Suite 3D
Fort Collins, CO 80525
970-491-9888 x Fax 303-921-7320
(Drainage Memorandum Continued)
Existing Condition Drainage Items (Not caused by Home2 Suites)
1.On Page 6 of the site photos (attached), it may be seen that the Texas Roadhouse parking area in the
southwest corner of their lot has degraded over time. Previous drainage reports show that this entire lot should
drain northerly to Delaney Drive and indications on-site seem to suggest that this area drained to the north
previously. As far as can be told, the drainage on the Texas Roadhouse side appears to be caused by neglect
and disrepair on the part of Texas Roadhouse, as the state of the asphalt, curb and gutter show signs of long-
term settling.
2.On Page 6 of the site photos (attached), it may be seen that the Cinemark drainage at the southwest rear
exit door appears to take water in a sump condition. The condition appears to be an adversely sloped pan at the
roof drain effluence as well as poor grading on the walk and in the planter areas. This condition was observed
by several JR employees prior to the onset of construction, when the lot was vacant (existing condition).
BASIN 1
BASIN 2
Stormwater Facility Name:
Facility Location & Jurisdiction:
User Input: Watershed Characteristics User Defined User Defined User Defined User Defined
Watershed Slope =0.005 ft/ft Stage [ft]Area [ft^2]Stage [ft]Discharge [cfs]
Watershed Length =390 ft 0.00 475 0.00 0.02
Watershed Area =0.65 acres 0.25 713 0.25 0.02
Watershed Imperviousness =84.8%percent 0.50 958 0.50 0.02
Percentage Hydrologic Soil Group A =0.0%percent 0.75 1,211 0.75 0.02
Percentage Hydrologic Soil Group B =0.0%percent 1.00 1,346 1.00 0.02
Percentage Hydrologic Soil Groups C/D =100.0%percent 1.25 1,717 1.25 3.00
1.50 1,976 1.50 6.80
User Input 17
WQCV Treatment Method =12.00 hours
After completing and printing this worksheet to a pdf, go to:
https://maperture.digitaldataservices.com/gvh/?viewer=cswdif
create a new stormwater facility, and
attach the pdf of this worksheet to that record.
Routed Hydrograph Results
Design Storm Return Period =WQCV 2 Year 5 Year 10 Year 50 Year 100 Year
One-Hour Rainfall Depth =0.53 0.82 1.13 1.40 2.39 2.86 in
Calculated Runoff Volume =0.015 0.037 0.054 0.069 0.125 0.153 acre-ft
OPTIONAL Override Runoff Volume =acre-ft
Inflow Hydrograph Volume =0.015 0.037 0.053 0.068 0.125 0.152 acre-ft
Time to Drain 97% of Inflow Volume =11.5 19.2 18.9 18.6 17.4 16.9 hours
Time to Drain 99% of Inflow Volume =11.8 19.7 19.7 19.7 19.3 19.2 hours
Maximum Ponding Depth =0.66 1.02 1.05 1.09 1.17 1.22 ft
Maximum Ponded Area =0.026 0.032 0.033 0.034 0.037 0.038 acres
Maximum Volume Stored =0.012 0.022 0.023 0.025 0.027 0.029 acre-ft
Stormwater Detention and Infiltration Design Data Sheet
Bioretention LID Basin #1
Home2 Suites at Harmony Village, City of Fort Collins
Location for 1-hr Rainfall Depths (use dropdown):
Workbook Protected Worksheet Protected
(Bioretention LID Basin #1)SDI_Design_Data_v1.04.xlsm, Design Data 3/29/2016, 10:58 AM
Stormwater Facility Name:
Facility Location & Jurisdiction:
User Input: Watershed Characteristics User Defined User Defined User Defined User Defined
Watershed Slope =0.005 ft/ft Stage [ft]Area [ft^2]Stage [ft]Discharge [cfs]
Watershed Length =500 ft 0.00 270 0.00 0.00
Watershed Area =1.02 acres 0.25 360 0.25 0.00
Watershed Imperviousness =86.1%percent 0.50 427 0.50 0.00
Percentage Hydrologic Soil Group A =0.0%percent 0.75 497 0.75 0.00
Percentage Hydrologic Soil Group B =0.0%percent 1.00 610 1.00 0.00
Percentage Hydrologic Soil Groups C/D =100.0%percent 1.25 816 1.25 3.00
1.50 1,190 1.50 6.00
User Input 17 1.72 1,300 1.72 10.40
WQCV Treatment Method =12.00 hours
After completing and printing this worksheet to a pdf, go to:
https://maperture.digitaldataservices.com/gvh/?viewer=cswdif
create a new stormwater facility, and
attach the pdf of this worksheet to that record.
Routed Hydrograph Results
Design Storm Return Period =WQCV 2 Year 5 Year 10 Year 50 Year 100 Year
One-Hour Rainfall Depth =0.53 0.82 1.13 1.40 2.39 2.86 in
Calculated Runoff Volume =0.025 0.060 0.086 0.109 0.197 0.241 acre-ft
OPTIONAL Override Runoff Volume =acre-ft
Inflow Hydrograph Volume =0.024 0.059 0.085 0.109 0.197 0.241 acre-ft
Time to Drain 97% of Inflow Volume =>196 >196 >196 >196 >196 >196 hours
Time to Drain 99% of Inflow Volume =>196 >196 >196 >196 >196 >196 hours
Maximum Ponding Depth =1.02 1.11 1.12 1.14 1.23 1.27 ft
Maximum Ponded Area =0.014 0.016 0.016 0.017 0.018 0.019 acres
Maximum Volume Stored =0.010 0.012 0.012 0.012 0.014 0.014 acre-ft
Stormwater Detention and Infiltration Design Data Sheet
Bioretention LID Basin #2
Home2 Suites at Harmony Village, City of Fort Collins
Location for 1-hr Rainfall Depths (use dropdown):
Workbook Protected Worksheet Protected
(Bioretention LID Basin #2)SDI_Design_Data_v1.04.xlsm, Design Data 3/29/2016, 11:01 AM
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