HomeMy WebLinkAboutSite Certifications - 07/21/2020OVERALL SITE and DRAINAGE CERTIFICATION
Commercial, Multi-Family and Subdivision Certification Form and Checklist
Project Name:
Date:
Building Permit Numbers:
(Commercial or multi-family)
Per the requirement in Fort Collins Stormwater Criteria Manual (FCSCM) Volume 1, Section 6.11 to certify as-
built construction to the approved drainage and grading plans, 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.)
x Use “Yes” for items completed as described.
x Use “N/A” for items that are not applicable to the site being certified.
x 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 - FCSCM Vol.2, Ch.10
For multiple detention basins on a site, provide the following for each basin separately:
A. Volume: 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
of Colorado.
2. 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. Stage-storage-discharge tables are provided on a separate document.
5. 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
/18 Page
Harmony 23 (The Wyatt)
November 12, 2019
B1706872, 73, 74, 75, 76, 77, 78, 79, 80, 81, 82, 83, 84, 85, and 86
Yes
Yes
Yes
Yes
Yes
Yes
/18 Page 2
B.Water Quality and Quantity Detention Basin Grading: 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. 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.
x 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. +/-.
2. Side Slopes: 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: The following items must be field verified:
a. The location of the spillway is indicated on the as-built plan.
b. The width of the spillway is indicated on the as-built plan.
c. 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. There is downstream scour protection in the spillway as per the construction plans. Indicate
type: (riprap size “D50” gradation and bedding type, geotextile, buried
riprap with inches of bury, etc.).
f. There are no obstructions in the spillway, such as trees, bushes, sidewalks, landscape
features, rocks, etc.
1%
Yes
N/A
Yes
N/A
N/A
N/A
Yes
N/A
N/A
N/A
N/A
N/A
N/A
/18 Page 3
4.Outlet Structure:
a. The orifice plate for the approved release rate is installed with the correct size and location of
the orifice.
b. 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. 100-year overflow grate elevation is . (Elev. A on detail D-46)
f. The top elevation of the water quality capture volume is . (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. 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% min. (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. As-built spot elevations on channels/swales are shown that correspond to spot elevations
shown on the approved construction plans.
4. 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. All pans, curbs, storm pipes or other appurtenances appropriately tie into each other in the
system. (Pictures at tie-in points suggested.)
6. 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. 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.)
Yes
Yes
Yes
Yes
Yes POND A=48.05 POND B=45.80
Yes POND A=44.54, B=40.75
Yes
Yes
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
/18 Page 4
III. Storm Pipes (aka storm drains) - FCSCM Vol.1, Ch.6, Sec. 4
A. Storm Drain Pipe Capacity: 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. 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. 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. 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 and construction specifications.
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. All encasements and clearances as specified on the approved construction plans have been met.
3. 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. The concrete pans are the correct size/width as shown on the approved construction plans.
2. 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. 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. 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. The spot elevations shown on the concrete pan(s) have been verified and are shown on the as-
built drawings.
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
/18 Page 5
V. Storm Drain Inlets - FCSCM Vol.1, Ch.6, Sec. 3
A. Construction/Installation: All storm drain inlets have been constructed in accordance with the
approved construction plans and construction specifications.
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. The size of the inlet opening is consistent with the approved detail. (Check height and width.)
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.
5. The as-built size of the inlet box is as shown on the construction plans or an explanation or
justification is attached.
6. All Type C, R, 13 and 16 inlet covers are stenciled or stamped with the following designation (or
an equivalent): NO DUMPING – DRAINS TO POUDRE RIVER.
VI. Culverts - FCSCM Vol.2, Ch.9
A. Construction/Installation: All culverts have been constructed and/or installed in accordance with
the approved construction plans and construction specifications.
1. All culvert sizes have been verified as indicated on the as-built construction plans as correct.
2. The culvert material type for all culverts installed is as on the approved construction plans and is
indicated on the as-built plans.
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: All sub-drains shown on the construction plans have been installed in
accordance with those plans and the construction specifications. 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.
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
N/A
N/A
N/A
N/A
/18 Page 6
3. The cover requirements per the construction plans are provided.
4. 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. 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 and construction specifications.
1. 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: All sidewalk culverts have been installed at the locations shown on the
approved construction plans.
1. 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.
5. 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.
N/A
N/A
N/A
N/A
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
N/A
N/A
/18 Page 7
2. 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. All turf reinforcement mats (TRMs) 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: All fabric has been installed in the locations and sizes indicated on the approved
construction plans.
1. 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. All construction debris has been removed except in staging area(s).
2. 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 BMPs - 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 construction plans
and specifications both in location, horizontal dimensions and cross-section.
XV. Certification of LID and Water Quality Facilities - FCSCM Vol.3, Ch.4
A. 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.
N/A
N/A
Yes
N/A
N/A
Yes
Yes
Yes
Yes
N/A
N/A
From:Leslie Thompson
To:Jonathan Sweet
Subject:Re: H23 (The Wyatt) Roof Drain into Box Elder Ditch
Date:Friday, January 3, 2020 2:53:55 PM
Hi Jon,
After inspecting the drainage in question, I have no problem with minor drainage into the Box
Elder along the north and east side of the development.
As long as drainage from paved parking lots go into Storm drains, I am ok with the existing
drainage into the Box Elder ditch.
Les Thompson
Ditch Superintendent
Box Elder Ditch
(970)214-6451
On Jan 3, 2020, at 10:45 AM, Jonathan Sweet <jsweet@tstinc.com> wrote:
Happy New Year Les. We are wrapping up the H23 project and the City wants to make
sure that Box Elder is okay with a few roof drains that could potentially travel across a
grassed slope and discharge into the small grated sections of the Box Elder Ditch along
Strauss Cabin Road. Prior to the relocation of the ditch and construction of this project,
most of the western half of the project area and portions of Harmony Road drained
into the Box Elder so we have significantly decreased the runoff to the ditch with H23. I
attached a picture showing one of the areas the City has asked about. I’d be happy to
meet onsite to discuss further. I can also quantify the runoff to the ditch before and
after the H23 construction if this is helpful. What I need is something in writing that
states Box Elder is okay with this runoff entering the ditch.
Thanks Les,
Jon
Jon Sweet, P.E., LEED AP
Project Manager
TST, Inc. Consulting Engineers
748 Whalers Way, Suite 200
Fort Collins, CO 80525
970.226.0557 (main)
970.488.2128 (direct)
970.821.5560 (cell)
<20200103_101808.jpg>
SCALE:
N.T.S.
DETENTION POND B OUTLET STRUCTURE
PLAN VIEW
BASE SLAB
CROSS SECTION
GRATING (WITH HINGED
SECTIONS, EACH SECTION
NOT TO EXCEED 5 FEET
IN LENGTH)
2' WIDE CONCRETE PAN
100-YEAR WATER SURFACE ELEVATION
100-YEAR ORIFICE PLATE
(2 YR. HISTORIC RELEASE RATE)
1.0' FREEBOARD (MIN.)
2' CONCRETE PAN
PREFABRICATED BAR GRATING, CROSS
BARS @ 4" O.C., BEARING BARS 1 1/2" BY
3/16" @ 1 3/16" O.C.
FINISHED GRADE
4:1 SLO
P
E
A
A
HINGE (TYP.)
SEE DETAIL
WQCV WATER SURFACE ELEVATION
A
D
F
H
6"
6"OUTSIDE EDGE OF
STRUCTURE WALL
6" ( TYP.)
J K L
6" WALL TYP.
E
G
I
WALL (TYP.)
#4 BARS @ 12" CTRS. EA. WAY
TYP. FOR WALLS AND FLOOR
POND CREST
(EMERGENCY SPILLWAY)
FLOW
OVERFLOW
WQ ORIFICE PLATE
M
OUTLET PIPE
SIZE =
B
C
WQ ORIFICE PLATE
NOTES:
1. ALL METAL PARTS SHALL BE STAINLESS STEEL, ALUMINUM, OR STEEL. STEEL
SHALL BE HOT DIP GALVANIZED AND MAY BE PAINTED AFTER GALVANIZING.
2. MINIMUM CONCRETE MIX SHALL BE 5 1/2 SACK, 3000 PSI. CONCRETE TO BE
REINFORCED WITH #4 BARS 12" O.C. EACH DIRECTION. 1" CHAMFER ON ALL
EXPOSED CORNERS OF WALLS.
100-YR ORIFICE
BLOCK-OUT IN WALL
SECTION "A - A"
8"
BASE SLAB
GRATE (TOP FLUSH W/ TOP OF STRUCTURE)
HINGE DETAIL
1 1/2" DEEP BY 2 1/2" WIDE
GRATE SUPPORT LEDGE
FORMED IN CONCRETE WALLS
1/4" STEEL
HINGE PLATE
SIDE VIEW PLAN VIEW
1" BAR WELDED
TO GRATING
3"
7"
GRATE SUPPORT LEDGE
FORMED INTO STRUCTURE WALL
NOTCH GRATING
TO CLEAR HINGE
PROJECTION
SECURE HINGE
PLATE TO WALL
WITH 3/8" BOLTS
SCALE:
N.T.S.
STANDARD
CONSTRUCTION DETAILS
DETENTION POND OUTLET -MODIFIED
SHEET
2 OF 2
#4 BARS @ 12" CTRS. EA. WAY
TYP. FOR WALLS AND FLOOR
(6" MIN.)
M
SCALE:
N.T.S.
DETENTION POND A OUTLET STRUCTURE
PLAN VIEW
BASE SLAB
CROSS SECTION
GRATING (WITH HINGED
SECTIONS, EACH SECTION
NOT TO EXCEED 5 FEET
IN LENGTH)
100-YEAR WATER SURFACE ELEVATION
100-YEAR ORIFICE PLATE
(2 YR. HISTORIC RELEASE RATE)
1.0' FREEBOARD (MIN.)
PREFABRICATED BAR GRATING, CROSS
BARS @ 4" O.C., BEARING BARS 1 1/2" BY
3/16" @ 1 3/16" O.C.
FINISHED GRADE
4:1 SLO
P
E
A
A
HINGE (TYP.)
SEE DETAIL
A
F
H
6"OUTSIDE EDGE OF
STRUCTURE WALL
6" ( TYP.)
J L
G
I
#4 BARS @ 12" CTRS. EA. WAY
TYP. FOR WALLS AND FLOOR
POND CREST
(EMERGENCY SPILLWAY)
FLOW
OVERFLOW
M
OUTLET PIPE
SIZE =
B
C
6" WALL TYP.
SCALE:
N.T.S.
DETENTION POND A WATER QUALITY OUTLET STRUCTURE
PLAN VIEW
BASE SLAB
CROSS SECTION
US FILTER STAINLESS STEEL
WELL SCREEN NO.93 OR
APPROVED EQUAL
WQCV WATER SURFACE ELEVATION
WQ ORIFICE PLATE
US FILTER STAINLESS STEEL WELL
SCREEN NO.93 OR APPROVED EQUAL
4:1 SLO
P
E
A
A
HINGE (TYP.)
SEE DETAIL
A
D
6"OUTSIDE EDGE OF
STRUCTURE WALL
6" ( TYP.)
J
E
#4 BARS @ 12" CTRS. EA. WAY
TYP. FOR WALLS AND FLOOR
FINISHED GRADE
WQCV POND CREST
(EMERGENCY SPILLWAY)
FLOW
M
OUTLET PIPE
SIZE =
B
C6" WALL TYP.
Project:
Basin ID:
Design Information (Input):
Width of Basin Bottom, W =ft Right Triangle OR…
Length of Basin Bottom, L =ft Isosceles Triangle OR…
Dam Side-slope (H:V), Zd =ft/ft Rectangle OR…
Circle / Ellipse OR…
Irregular X (Use Overide values in cells G32:G52)
MINOR MAJOR
Storage Requirement from Sheet 'Modified FAA': acre-ft.
Stage-Storage Relationship:Storage Requirement from Sheet 'Hydrograph': acre-ft.
Storage Requirement from Sheet 'Full-Spectrum': acre-ft.
Labels Water Side Basin Basin Surface Surface Volume Surface Volume Target Volumes
for WQCV, Minor, Surface Slope Width at Length at Area at Area at Below Area at Below for WQCV, Minor,
& Major Storage Elevation (H:V) Stage Stage Stage Stage Stage Stage Stage & Major Storage
Stages ft ft/ft ft ft f 2 f 2 Use f 3 acres acre-f Volumes
(input) (input)Below El.(output) (output) (output)Overide (output) (output) (output) (for goal seek)
4843.00 (input)906 0 0.021 0.000
4844.00 4.00 0.00 0.00 9,950 5,428 0.228 0.125
WQCV 4844.54 4.00 0.00 0.00 15,874 12,400 0.364 0.285 0.180
4845.00 4.00 0.00 0.00 19,824 20,611 0.455 0.473
4846.00 4.00 0.00 0.00 26,041 43,543 0.598 1.000
4847.00 4.00 0.00 0.00 30,440 71,784 0.699 1.648
100-yr + WQCV 4848.05 4.00 0.00 0.00 35,689 106,502 0.819 2.445 2.450
4849.00 4.00 0.00 0.00 43,378 144,058 0.996 3.307
Box Elder Ditch 4849.20 4.00 0.00 0.00 44,367 152,833 1.019 3.509
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STAGE-STORAGE SIZING FOR DETENTION BASINS
H23
Check Basin Shape
Pond A - ASBUILT
UD Detention Pond A As Built VolCalc, Basin 11/13/2019, 8:25 AM
Project:
Basin ID:
STAGE-STORAGE SIZING FOR DETENTION BASINS
4843.00
4844.00
4845.00
4846.00
4847.00
4848.00
4849.00
4850.00
0.00 0.50 1.00 1.50 2.00 2.50 3.00 3.50 4.00
St
a
g
e
(
f
t
.
e
l
e
v
.
)
Storage (acre-feet)
STAGE-STORAGE CURVE FOR THE POND
UD Detention Pond A As Built VolCalc, Basin 11/13/2019, 8:25 AM
Project:
Basin ID:
Design Information (Input):
Width of Basin Bottom, W =ft Right Triangle OR…
Length of Basin Bottom, L =ft Isosceles Triangle OR…
Dam Side-slope (H:V), Zd =ft/ft Rectangle OR…
Circle / Ellipse OR…
Irregular X (Use Overide values in cells G32:G52)
MINOR MAJOR
Storage Requirement from Sheet 'Modified FAA': acre-ft.
Stage-Storage Relationship:Storage Requirement from Sheet 'Hydrograph': acre-ft.
Storage Requirement from Sheet 'Full-Spectrum': acre-ft.
Labels Water Side Basin Basin Surface Surface Volume Surface Volume Target Volumes
for WQCV, Minor, Surface Slope Width at Length at Area at Area at Below Area at Below for WQCV, Minor,
& Major Storage Elevation (H:V) Stage Stage Stage Stage Stage Stage Stage & Major Storage
Stages ft ft/ft ft ft f 2 f 2 Use f 3 acres acre-f Volumes
(input)(input)Below El.(output) (output) (output)Overide (output) (output) (output) (for goal seek)
4839.25 (input)0 0 0.000 0.000
4840.00 4.00 0.00 0.00 5,188 1,946 0.119 0.045
ASBUILT WQCV 4840.75 4.00 0.00 0.00 18,819 10,948 0.432 0.251
4841.00 4.00 0.00 0.00 19,638 15,755 0.451 0.362
4842.00 4.00 0.00 0.00 25,438 38,293 0.584 0.879
4843.00 4.00 0.00 0.00 29,625 65,825 0.680 1.511
4844.00 4.00 0.00 0.00 34,085 97,680 0.782 2.242
4845.00 4.00 0.00 0.00 38,495 133,970 0.884 3.076
ASBUILT 100-yr + WQCV 4845.80 4.00 0.00 0.00 42,332 166,301 0.972 3.818
4847.00 4.00 0.00 0.00 48,571 220,842 1.115 5.070
4848.00 4.00 0.00 0.00 54,307 272,281 1.247 6.251
4849.00 4.00 0.00 0.00 61,481 330,175 1.411 7.580
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STAGE-STORAGE SIZING FOR DETENTION BASINS
H23
Check Basin Shape
POND B - ASBUILT
UD Detention Pond B VolCalc - As Built, Basin 11/13/2019, 8:39 AM
Project:
Basin ID:
STAGE-STORAGE SIZING FOR DETENTION BASINS
4839.25
4841.25
4843.25
4845.25
4847.25
4849.25
4851.25
0.00 1.00 2.00 3.00 4.00 5.00 6.00 7.00 8.00
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Storage (acre-feet)
STAGE-STORAGE CURVE FOR THE POND
UD Detention Pond B VolCalc - As Built, Basin 11/13/2019, 8:39 AM