HomeMy WebLinkAboutSite Certifications - 07/08/20182900 South College Avenue, Suite 3D Fort Collins, CO 80525
970-491-9888 x www.jrengineering.com
November 27, 2017
City of Fort Collins
281 North College Avenue
Fort Collins, Colorado 80524
RE: Affinity of Fort Collins – Overall Site and Drainage Certification
Dear Wes Lamarque:
JR Engineering confirms that the Affinity of Fort Collins overall site, grading and drainage
infrastructure was constructed or installed to meet the design intent. The site is located on the
northern end of Corbett Drive off Harmony Road, adjacent to Front Range Village. The Affinity site
includes a multi-family apartment building, pool house, parking garages, and a paved drive with
parking. The overall site slopes from southwest to north east. Storm water is collected within swales,
curbs, and storm sewer and conveyed to a sand filter located north of the building or within the
primary water quality/detention pond located east of the building. The drainage outfall from the site
is via a 12” ADS pipe, within an easement across the adjacent property to the storm sewer system
within Ziegler Road. The constructed LID facilities including: bioswales along the north and west of
the site, pervious pavers within the entrance drive and the sand filter north of the building treat
runoff from over 75% of the impervious area to meet the City’s LID requirement.
The porous pavement system installed along the entrance drive on the south side of the building was
constructed without underdrains. Although JR Engineering provided a verbal recommendation for an
underdrain for the porous pavement section, a previous geotechnical study,Subsurface Exploration
Report – Addendum No. 2 provided by EEC for Inland Group on June 10, 2015 identified a percolation
rate of 80 minutes per inch for the onsite soils. This percolation rate is deemed suitable for the
porous pavement system without an underdrain. If it is determined that the existing subgrade does
not maintain a suitable infiltration, JR recommends installing an isolated underdrain system tied into
the adjacent curb inlets.
The following items identified in your October 17th email have been corrected per the approved utility
plan:
x All riprap needs to be buried per the detail in the Utility Plans.
9 The riprap was buried per the soil riprap detail in the plans (see images below)
Accepted 7/8/2018 WL
City of Fort Collins Page 2
Affinity November 27, 2017
2900 South College Avenue, Suite 3D Fort Collins, CO 80525
970-491-9888 x www.jrengineering.com
x The south fore-bay in Pond A is holding water and needs to have a positive slope into the
Pond.
9 The bottom of the south fore-bay on Pond A was adjusted and now promotes a positive slope
to the trickle channel (see image below).
x The outlet structure for Pond B does not appear to be built per the plans. This is the outlet
for the sand filter and should have a ponding depth of 1.4 feet before any water spills into the
inlet.
9 The outlet is reconstructed with a flat top as designed. The grated top opening is set at an
elevation of 4937.01 to provide an overall pond depth below overflow of 3.01 feet as
designed (see image below).
City of Fort Collins Page 3
Affinity November 27, 2017
2900 South College Avenue, Suite 3D Fort Collins, CO 80525
970-491-9888 x www.jrengineering.com
This letter includes our completed certification package for the Affinity project. Please let me
know if you have any questions or comments.
Respectfully submitted,
JR ENGINEERING, LLC
Jason Tarry, PE
Project Manager
Ph: (303) 267-6215
Email:jtarry@jrengineering.com
Incl:
Project Name: O.+ Fa r4((/
Date: 9(o
Building Permit Numbers: 61(ooL100 13 ((O3'5 LI
(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: ye 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.
1.'' Detention basin topography was prepared by a professional land surveyor registered in the state
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of Colorado.
2.Y'5 Both proposed and as-built contours are shown on the same plan sheet (dashed lines for
proposed and solid lines for as-built).
3.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.yc Stage-storage-discharge tables are provided on a separate document.
S. "je 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: '1e 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 _____
b.'k) 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.______ 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 engineer's statement of
visual inspection and compliance. (Choose one below.)
o ______ 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 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: '1e' 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.
Spillway Certification: The following items must be field verified:
a.'(e The location of the spillway is indicated on the as-built plan.
b.'1e 5 The width of the spillway is indicated on the as-built plan.
c.'fe> The elevation(s) of the spillway is shown on the as-built plan.
d.______ A concrete ribbon defines the location and grade of the spillway.
e.'fe> There is downstream scour protection in the spillway as per the construction plans. Indicate
type: L Surjcc ieraW (riprap size "D50" gradation and bedding type, geotextile, buried
riprap with I P " inches of bury, etc.).
f.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.The orifice plate for the approved release rate is installed with the correct size and location of
the orifice.
b.'*5 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.'(es The well screen is the correct material and is installed as shown on the construction plans.
e.'je 100-year overflow grate elevation is "193o .SO . (Elev. A on detail D-46)
f."je5 The top elevation of the water quality capture volume is '193Z -50 . (Elev. B on detail
D-46)
g.> Overflow grate is made of the correct material, has the correct bar spacing, is hinged at the
top and bolted at the bottom.
h.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: 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.'t-6 swales are located within the drainage easements as shown on the construction plans.
2."fe', 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._6 spot elevations on channels/swales are shown that correspond to spot elevations
shown on the approved construction plans.
4."(eS 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."fr5 All pans, curbs, storm pipes or other appurtenances appropriately tie into each other in the
system. (Pictures at tie-in points suggested.)
6."fr 5 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." e C) 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
III. Storm Pipes (aka storm drains) - FCSCM Vol.1, Ch.6, Sec. 4
A.Storm Drain Pipe Capacity: '1S 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. S 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. "le$ 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. '1eS 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: 'frr, All pipes are installed in accordance with the
approved construction plans.
1.'fe$ 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.
3.'jes 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: All concrete pans have been constructed in accordance with the
approved construction plans.
1."fe The concrete pans are the correct size/width as shown on the approved construction plans.
2.'1) 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." e) 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.'1 0 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.'1('> The spot elevations shown on the concrete pan(s) have been verified and are shown on the as-
built drawings.
12/15 Page4
V. StormDrainInlets -FCSCMVol.1,Ch.6,Sec.3
A. Construction/Installation: All storm drain inlets have been constructed in accordance with the
approved construction plans.
1.e , 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."_ The size of the inlet opening is consistent with the approved detail. (Check height and width.)
'j 3.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.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.
S. "IC) The as-built size of the inlet box is as shown on the construction plans or an explanation or
justification is attached.
6. "{ (S All inlet covers are stenciled or stamped with the following designation: NO DUMPING - DRAINS
TO POUDRE RIVER.
VI. Culverts -FCSCMVol.2,Ch.9
A. Construction/Installation: 'je All culverts have been constructed and/or installed in accordance with
the approved construction plans.
i. "(t> All culvert sizes have been verified as indicated on the as-built construction plans as correct.
2."fr The culvert material type for all culverts installed is as on the approved construction plans and is
indicated on the as-built plans.
3.'fr 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: 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.The size of the sub-drains are as approved on the construction plans and are indicated on the as-
built plans.
2.______ 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.'Ic> The cover requirements per the construction plans are provided.
4.'c> 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.The backfill materials for sub-drains are as shown on the approved construction plans. (This
includes the type, depth and width.)
6.'f'i 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.'lc ~ The size (width) of the curb cut opening is as shown on the approved construction plans.
2.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: '10 All sidewalk culverts have been installed at the locations shown on the
approved construction plans.
1.'1(2 The size (width and length) of the culverts are as shown on the approved construction plans.
2.__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.The sidewalk culvert invert "in and out" elevations have been verified and are indicated on the
as-built plans.
4.The sidewalk culvert opening is as shown on the approved construction plans or per the City's
detail.
s. Ye? 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: __ 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.N 0 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.___Q turf reinforcement mats (TRM5) have been installed as shown on the approved construction
plans and the slopes are stabilized.
XI. Riprap - FCSCM Vol.1, Ch.7, Sec.4.4.4.3
A. Construction: ______ 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: "tC) All fabric has been installed in the locations and sizes indicated on the approved
construction plans.
1. 1 C) All fabric was installed per the details on the approved construction plans.
XIII. Post-Construction Site Cleanup - FCSCM Vol.3, Ch.7
A. Construction: All construction debris and obstructions of any kind have been removed from
drainage paths.
1."fr) All construction debris has been removed except in staging area(s).
2.'ks All ruts have been smoothed out in all construction areas.
3.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 BMP5 - FCSCM Vol.2, Ch.8, Sec.2 & FCSCM Vol.2, Ch.12
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. "(i 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 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
Engineer's contact information:
Name: 'iOOV\ \cr1
Email: I*crr\1 I
Phone: So3- 2(a7-(0ZIS
Company: cj E'r.
Address: Z9Oo S Co "04e 3P
Eoyt Ct.v\s CO OSZS
M.
ka
ON
PE Stamp
Sign and date
FPt°oI.Lins
12/15 Page 8
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(A) CURB INLET GRATE: 4940.14
INV E: 4933.59
INV S: 4933.64
(B) CUB INLET GRATE: 4940.17
INV E: 4935.68
INV S: 4936.57
INV W: 4936.25
(C) MANHOLE RIM: 4940.98
INV N: 4936.88
INV SE: 4936.93
(D) AREA DRAIN GRATE: 4939.98
INV NW: 4937.24
(E) MANHOLE RIM:4941.06
INV E: 4936.60
INV S: 4936.60
(F) AREA DRAIN GRATE: 4940.29
INV N: 4936.69
INV S: 4936.69
(G) AREA DRAIN GRATE: 4940.52
INV N: 4937.30
(H) CURB INLET GRATE: 4941.07
INV NW: 4935.82
INV E: 4935.80
(I) CURB INLET GRATE: 4940.06
INV NW: 4936.60
INV SE: 4936.16
(J) AREA DRAIN GRATE: 4941.26
INV N: 4937.92
INV SE: 4937.11
(K) AREA DRAIN GRATE: 4941.13
INV S:4938.35
(L) AREA DRAIN GRATE: 4939.00
INV E: 4934.54
INV W: 4935.07
(M) MANHOLE RIM: 4939.36
INV N: 4935.46
INV E: 4934.41
INV W: 4934.45
(N) CURB INLET GRATE: 4939.96
INV S: 4936.06
(O) MANHOLE RIM: 4939.02
INV NE: 4933.82
INV W: 4933.90
(P) CURB INLET GRATE: 4936.72
INV W: 4933.67
(Q) MANHOLE RIM: 4934.98
INV E: 4930.03
INV SW: 4929.98
(R) AREA DRAIN GRATE: 4939.00
INV S: 4935.48
INV W: 4935.58
(S) MANHOLE RIM: 4940.48
INV SE: 4932.93
INV W: 4933.03
(T) CURB INLET GRATE: 4940.14
INV E: 4934.64
INV W: 4934.69
STORM DRAIN AS-BUILT ELEVATIONS
SEE SHEET 2 FOR OFFSITE STORM
Sheet 1 of 2 Project #: 2016-031 Date: Aug. 22, 2017 Scale: 1"=30' Drawn: CDB
4025 Automation Way Suite C4
Fort Collins, CO 80525
970-232-9645
www.WashburnSurveying.com
AFFINITY SUBDIVISION AS-BUILT SURVEY
LOT 1, BLOCK 1 OF THE AFFINITY SUBDIVISION
Sheet 2 of 2 Project #: 2016-031 Date: Aug. 22, 2017 Scale: 1"=30' Drawn: CDB
4025 Automation Way Suite C4
Fort Collins, CO 80525
970-232-9645
www.WashburnSurveying.com
AFFINITY SUBDIVISION OFFSITE STORM AS-BUILT SURVEY
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POND 286 OVERFLOW WEIR PROFILE PROFILE
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City of Fort Collins, Colorado
UTILITY PLAN APPROVAL
DateCity Engineer
DateWater & Wastewater Utility
DateStormwater Utility
DateParks & Recreation
DateTraffic Engineer Date
DateEnvironmental Planner
Date
City of Fort Collins, Colorado
UTILITY PLAN APPROVAL
DateCity Engineer
DateWater & Wastewater Utility
DateStormwater Utility
DateParks & Recreation
DateTraffic Engineer Date
DateEnvironmental Planner
Date
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City of Fort Collins, Colorado
UTILITY PLAN APPROVAL
DateCity Engineer
DateWater & Wastewater Utility
DateStormwater Utility
DateParks & Recreation
DateTraffic Engineer Date
DateEnvironmental Planner
Date
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City of Fort Collins, Colorado
UTILITY PLAN APPROVAL
DateCity Engineer
DateWater & Wastewater Utility
DateStormwater Utility
DateParks & Recreation
DateTraffic Engineer Date
DateEnvironmental Planner
Date
Stormwater Facility Name:
Facility Location & Jurisdiction:
User Input: Watershed Characteristics User Defined User Defined User Defined User Defined
Watershed Slope =0.020 ft/ft Stage [ft]Area [ft^2]Stage [ft]Discharge [cfs]
Watershed Length =832 ft 0.00 31 0.00 0.50
Watershed Area =3.71 acres 1.00 4,080 1.00 0.50
Watershed Imperviousness =60.8%percent 2.00 5,781 2.00 0.50
Percentage Hydrologic Soil Group A =percent 3.00 6,489 3.00 0.50
Percentage Hydrologic Soil Group B =percent 4.00 7,478 4.00 18.50
Percentage Hydrologic Soil Groups C/D =100.0%percent 4.12 7,739 4.12 18.50
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 0.00 1.40 0.00 2.86 in
Calculated Runoff Volume =0.059 0.142 0.000 0.293 0.000 0.757 acre-ft
OPTIONAL Override Runoff Volume =acre-ft
Inflow Hydrograph Volume =0.059 0.141 #N/A 0.293 #N/A 0.756 acre-ft
Time to Drain 97% of Inflow Volume =1.7 3.7 #N/A 7.2 #N/A 9.6 hours
Time to Drain 99% of Inflow Volume =1.7 3.7 #N/A 7.3 #N/A 10.0 hours
Maximum Ponding Depth =0.43 1.25 #N/A 2.33 #N/A 3.33 ft
Maximum Ponded Area =0.04 0.10 #N/A 0.14 #N/A 0.16 acres
Maximum Volume Stored =0.009 0.071 #N/A 0.205 #N/A 0.351 acre-ft
Location for 1-hr Rainfall Depths (use dropdown):
Workbook Protected Worksheet Protected
Stormwater Detention and Infiltration Design Data Sheet
Affinity Subdivision Pond B
City of Fort Collins
Pond B - SDI_Design_Data_v1.08.xlsm, Design Data 9/25/2017, 7:42 AM
WQCV_Trigger =1
RunOnce=1
CountA=1
Draintime Coeff=0.8
0 1 2 3
#N/A
#N/A
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Stormwater Detention and Infiltration Design Data Sheet
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Pond B - SDI_Design_Data_v1.08.xlsm, Design Data 9/25/2017, 7:42 AM
Stormwater Facility Name:
Facility Location & Jurisdiction:
User Input: Watershed Characteristics User Defined User Defined User Defined User Defined
Watershed Slope =0.020 ft/ft Stage [ft]Area [ft^2]Stage [ft]Discharge [cfs]
Watershed Length =722 ft 0.00 0 0.00 0.00
Watershed Area =3.62 acres 0.50 995 0.50 0.10
Watershed Imperviousness =60.0%percent 1.50 5,756 1.50 0.28
Percentage Hydrologic Soil Group A =percent 2.50 7,418 2.50 1.23
Percentage Hydrologic Soil Group B =percent 3.50 8,685 3.50 1.46
Percentage Hydrologic Soil Groups C/D =100.0%percent 4.50 10,438 4.50 1.67
5.50 12,694 5.50 1.85
User Input 17 6.50 15,415 6.50 2.01
7.32 17,926 7.32 2.10
WQCV Treatment Method =40.00 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 0.00 1.40 0.00 2.86 in
Calculated Runoff Volume =0.071 0.137 0.000 0.283 0.000 0.735 acre-ft
OPTIONAL Override Runoff Volume =acre-ft
Inflow Hydrograph Volume =0.071 0.136 #N/A 0.282 #N/A 0.735 acre-ft
Time to Drain 97% of Inflow Volume =5.5 7.5 #N/A 8.7 #N/A 10.8 hours
Time to Drain 99% of Inflow Volume =5.8 8.0 #N/A 9.4 #N/A 12.1 hours
Maximum Ponding Depth =1.18 1.60 #N/A 2.25 #N/A 4.09 ft
Maximum Ponded Area =0.10 0.14 #N/A 0.16 #N/A 0.22 acres
Maximum Volume Stored =0.046 0.096 #N/A 0.191 #N/A 0.542 acre-ft
Location for 1-hr Rainfall Depths (use dropdown):
Workbook Protected Worksheet Protected
Stormwater Detention and Infiltration Design Data Sheet
Affinity Subdivision Pond A
City of Fort Collins
SDI_Design_Data_v1.08.xlsm, Design Data 9/22/2017, 2:19 PM
WQCV_Trigger =1
RunOnce=1
CountA=1
Draintime Coeff=1.0
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Check Data Set 1 Check Data Set 1
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Stormwater Detention and Infiltration Design Data Sheet
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SDI_Design_Data_v1.08.xlsm, Design Data 9/22/2017, 2:19 PM
1
Jason Tarry
From:mailer@digitaldataservices.com
Sent:Monday, September 25, 2017 9:36 AM
To:Jason Tarry
Subject:Stormwater Detention and Infiltration Facility - Affinity Subdivision Pond A
Thank you for submitting to the Colorado Stormwater Detention and Infiltration database. Your facility has
been recorded and the local jurisdiction has been notified.
Facility ID:SWDF-20170925083521
Name:Affinity Subdivision Pond A
Division:South Platte
Jurisdiction:FortCollins
Design Storm:Water Quality
Water Surface Acres:0.41
Edit Key:db5bc7df8e998ca6f87bc703367b8bc4
If you wish to edit the facility in the future, you will need the Edit Key listed above. If you lose the key, you
will not be able to edit the facility information in the future.
1
Jason Tarry
From:mailer@digitaldataservices.com
Sent:Monday, September 25, 2017 9:42 AM
To:Jason Tarry
Subject:Stormwater Detention and Infiltration Facility - Affinity Subdivision Pond B
Thank you for submitting to the Colorado Stormwater Detention and Infiltration database. Your facility has
been recorded and the local jurisdiction has been notified.
Facility ID:SWDF-20170925084158
Name:Affinity Subdivision Pond B
Division:South Platte
Jurisdiction:FortCollins
Design Storm:100-Year
Water Surface Acres:.18
Edit Key:5346cd878fe0258237fe126e087f6747
If you wish to edit the facility in the future, you will need the Edit Key listed above. If you lose the key, you
will not be able to edit the facility information in the future.
DP01 PROFILE
STA 10+00.00 TO 17+19.51
DP02 PROFILE
STA 10+00.00 TO 11+24.05
DP03 PROFILE
STA 10+00.00 TO 11+15.00
DP05 PROFILE
STA 10+00.00 TO 10+61.68
DP06 PROFILE
STA 10+00.00 TO 10+73.22
DP08 PROFILE
STA 10+00.00 TO 12+24.48
Know what's
DP04 PROFILE
STA 9+00.00 TO 17+00.00
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City of Fort Collins, Colorado
UTILITY PLAN APPROVAL
DateCity Engineer
DateWater & Wastewater Utility
DateStormwater Utility
DateParks & Recreation
DateTraffic Engineer Date
DateEnvironmental Planner
Date
OFFSITE DP01 PROFILE (1)
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City of Fort Collins, Colorado
UTILITY PLAN APPROVAL
DateCity Engineer
DateWater & Wastewater Utility
DateStormwater Utility
DateParks & Recreation
DateTraffic Engineer Date
DateEnvironmental Planner
Date
OFFSITE DP01 PROFILE (3)
STA 26+00.00 TO 33+00.00
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City of Fort Collins, Colorado
UTILITY PLAN APPROVAL
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DateWater & Wastewater Utility
DateStormwater Utility
DateParks & Recreation
DateTraffic Engineer Date
DateEnvironmental Planner
Date
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City of Fort Collins, Colorado
UTILITY PLAN APPROVAL
DateCity Engineer
DateWater & Wastewater Utility
DateStormwater Utility
DateParks & Recreation
DateTraffic Engineer Date
DateEnvironmental Planner
Date