design guide · design guide ndspro.com the s5 system addresses local and federal regulations by...

DESIGN GUIDE

ndspro.com

The S5 system addresses local and federal regulations by

managing stormwater onsite. This guide makes S5 easy

to specify and describes system anatomy, component

functions, design and implementation considerations.

DESIGN GUIDE

ndspro.com

2 3ndspro.comfor installation videos, specs, detail drawings and case studies, visit

A scalable & flexible solution that meets today’s performance standards for onsite stormwater managementFrom the known and trusted leader in stormwater solutions since 1972

S5 by NDS™ offers a comprehensive solution in line with Low Impact

Development policies by managing stormwater as close to its source as

possible through runoff reduction and quality enhancement at the site scale.

The S5 system is built around known and trusted components, providing

solutions that offer 5 key benefits:

• Conservation • Flexibility • Replenishment

• Management • Mitigation

Content04 System Anatomy

06 Introduction

07 Identify Runoff Sources

08 Select Methods of Capture

09 Determine Peak Flow

12 Determine Detention Volume

13 Size System Components

17 Field Layout

18 System Overflow

19 References

This manual provides design guidance for implementation of an S5 system. Consult local, state and federal stormwater-management design guidelines for specific compliance requirements. For more information please contact NDS Technical Services at 888-825-4716 or contact your local NDS sales representative.

SUSTAINABLE STORMWATER SOLUTIONS


NDS S5 components can be configured to meet a wide variety of residential and commercial applications.CAPTURES5 offers several options to collect stormwater from various sources.

• Catch basins function effectively for downspouts from roofs• Channel drains intercept sheet flow from paved surfaces• Permeable grass and gravel paver systems with underdrains collect stormwater from walkways

and parking areas when used as alternatives to traditional impermeable solutions

FILTERPrevent debris and other suspended solids in stormwater from impairing system function.

• Basin and channel grates provide a front line of mechanical filtration• Fabric filters contribute further cleaning of stormwater, extending system life• Grass and gravel paver systems naturally filter and clean stormwater while

flowing through the S5 permeable paver solutions

CONVEYMove stormwater from its sources to downstream detention, infiltration and overflow components.

• Smooth wall and corrugated pipe with appropriate fittings and adapters have known flow characteristics to get the job done

• Using EZflow™ for conveyance will also increase system detention and infiltration, effectively reducing the footprint of the downstream detention area

DETAINS5 detention components provide efficient volume to minimize runoff and maximize infiltration.

• Flo-Well® dry wells and EZflow leaching trench arrangements have defined volumes for this purpose• Flo-Well has 250% more detention volume than traditional stone-filled dry wells

INFILTRATEArrange Flo-Well dry wells and EZflow leaching trenches in customizable configurations and at depths suitable to existing site conditions, soil types and groundwater elevations.

• Flo-Well has an open bottom for direct leaching, and EZflow maximizes soil-contact area for effective infiltration

OVERFLOWAllow for excess stormwater beyond the design storm to overflow from the system in a safe, suitable downstream location.

NDS S5 system provides design flexibility for managing stormwater onsite.

Ideal for working with the contours and features of a site, S5 components

easily adapt to fit a wide range of projects and can be installed without the

use of heavy equipment. A single-source solution, S5 is also easy to specify,

qualifies for LEED credits and offers up to 250% more detention volume than

traditional gravel systems. A list of potential LEED credits for projects using

an S5 system is located in the References section at the end of this guide.

CAPTURE

CAPTURE

CAPTURE

FILTER

OVERFLOW

CONVEY & INFILTRATE

SUSTAINABLE STORMWATER SOLUTIONS

DETAIN & INFILTRATE

DETAIN & INFILTRATE


CONSERVATIONDroughts, storms and pollution increasingly threaten the quality of hydrologic systems and the supply of clean water. S5 systems conserve stormwater on site through filtration, deten-tion and infiltration, improving environmental health and contributing to reserves.

MANAGEMENTS5 systems manage rainfall at the site scale using smaller, decentral-ized controls for filtration, detention and infiltration, helping to mimic pre-de-velopment hydrology. This method is an effec-tive alternative to dispos-ing of stormwater with costly end-of-pipe sys-tems.

FLEXIBILITYHeavy-handed stormwa-ter management infra-structure can negatively alter our sense of place. The dynamic S5 system components provide the freedom to respond to environmental conditions and preserve a site’s unique features.

MITIGATIONExcessive stormwater runoff can introduce pollutants from hard surfaces into our water-ways and cause severe erosion. S5 system filters improve water quality, and detention and infiltra-tion components limit downstream erosion by reducing peak overflows.

REPLENISHMENT Extracting groundwater for drinking, agriculture and industrial processes reduces this limited resource and can cause ground subsidence. Preventing excessive stormwater runoff with an S5 system encourages subsurface recharge which helps balance withdrawl.

CONSERVATIONof water resources

improves ourwell-being.

REPLENISHMENTof groundwater

helps ensurefuture supply.

MANAGEMENT of stormwater at

the source reducesdownstream

impacts.

FLEXIBILITYof system footprintallows for adaptive

implementation.

MITIGATIONof pollution anderosion protectswater systems.

Storm water management plays vital role in the quality and availability of water.

Stormwater management plays a vital role in the quality and availability of water.

Proper stormwater management utilizing S5 can minimize the

negative impacts of excessive runoff and enhance the quality of our

valuable water resources. Built around five key benefits that support

sustainability, the NDS S5 system manages stormwater positively

supporting the principles of Low Impact Development.

Step 1: Identify Runoff SourcesRain will collect as runoff depending on the

type of surface it falls on. Impervious surfaces

such as roofs, concrete and asphalt generate

significantly more runoff than forested areas

and lawns. Clay soils generate more runoff than

sandier soils, compacted soils generate more

runoff than noncompacted soils, and so on.

Each surface type has an accepted coefficient

of runoff, or “C” value, as listed in Table 1

(see page 9) and used in the Rational Method

Equation for calculating runoff. Check with

applicable local design guidelines for runoff

coefficients used in your area.

The lay of the land and slope of roofs and

paved areas dictate the direction and velocity

of stormwater runoff. Runoff may further

collect in low spots in the landscape such as

depressions and shallow swales. Sources of

runoff may include: downspouts and scuppers;

sheet flow from impervious surfaces like

driveways and patios; grass-lined swales;

drain pipe under a permeable paver system

and French drains integrated within bioswales

or planted sand filters.

ROOFS PARKING LOTS

DRIVEWAYS

LANDSCAPE

POOL DECKS

LAWN

Best PracticePermeable pavements have the potential to generate significantly less runoff during storm events than traditional asphalt and concrete surfaces. NDS Tufftrack Grassroad Pavers, EZ Roll Grass Pavers and EZ Roll Gravel Pavers are used in permeable turf and gravel systems that effectively reduce stormwater runoff.

CONSERVATION

Droughts, storms and

pollution increasingly

threaten the quality of

hydrologic systems and

the supply of clean water.

S5 systems conserve

stormwater on site through

filtration, detention and

infiltration, improving

environmental health and

contributing to reserves.

MANAGEMENT

S5 systems manage rainfall

at the site scale using

smaller, decentralized

controls for filtration,

detention and infiltration,

helping to mimic pre-

development hydrology.

This method is an effective

alternative to disposing of

stormwater with costly end-

of-pipe systems.

FLEXIBILITY

Heavy-handed stormwater

management infrastructure

can negatively alter our

sense of place. The dynamic

S5 system components

provide the freedom to

respond to environmental

conditions and preserve a

site’s unique features.

MITIGATION

Excessive stormwater runoff

can introduce pollutants

from hard surfaces into

our waterways and cause

severe erosion. S5 system

filters improve water

quality, and detention and

infiltration components limit

downstream erosion by

reducing peak overflows.

REPLENISHMENT

Extracting groundwater for

drinking, agriculture and

industrial processes reduces

this limited resource and can

cause ground subsidence.

Preventing excessive

stormwater runoff with

an S5 system encourages

subsurface recharge which

helps balance withdrawl.

SYSTEM DESIGN GUIDANCE

Coefficient of Runoff* (C) = Runoff/RainfallSurface Type C Surface Type C

Asphalt Pavement 0.85-0.95 Clay Soil - Light Vegetation 0.60

Concrete Pavement 0.90-0.95 Clay Soil - Dense Vegetation/Lawn 0.50

Brick Pavement 0.70-0.85 Loam Soil - Light Vegetation 0.45

Roofs 0.75-0.95 Loam Soil - Dense Vegetation/Lawn 0.35

Compacted Gravel 0.70-0.85 Sand Soil - Light Vegetation 0.40

Bare Gravel 0.50-0.65 Sand Soil - Dense Vegeation/Lawn 0.30


Step 2: Select Methods of CaptureThe nature of managed runoff dictates the type,

size and configuration of capture devices. NDS

catch basins and assorted drain inlets function

well to capture runoff from downspouts and

serve as area drains to collect directional

drainage in the landscape. Channel and

trench drains efficiently collect sheet flows

from impervious surfaces such as parking

lots, driveways, plazas, pool decks & patios.

A perforated or slotted drain pipe may collect

stormwater percolating through a permeable

paver system. Capture can be directed to a

detention device like NDS Flo-Well, or through

filter media for collection by an NDS EZflow

engineered French drain.

Step 3: Determine Peak FlowCalculate peak flow for a given rain event in

your project area to size system elements

including capture devices and conveyance pipe.

The method selected for calculating peak flow

may vary depending on applicable regulatory

requirements and the nature of the project

drainage area. All methods attempt to quantify

a complex natural hydrologic event with simple

math; none are perfect. Current practices

vary and many designers rely on calculation

methods embedded in accepted software

packages including HydroCAD®, StormCAD and

several others.

The Natural Resources Conservation Service

(NRCS) states that the Rational Method is a

valid hydrologic design tool for predicting peak

flow rates from urban watersheds up to

50 acres, and is expressed by the Rational

Method Formula:

Q: It may be useful to modify the Rational Method Formula considering that for most S5

systems the sizing of capture and conveyance components is based on their relative flow

capacities in gallons per minute (gpm) and not cfs, and most drainage areas such as a roof,

driveway, patio or lawn area are more easily measured in square feet (sf) and not acres.

A modification to the formula is expressed as Q = (CiA)/96.23 when a peak runoff rate

expressed in gpm is desired and drainage areas are measured in sf.

C: As explained in Step 1: Identify Runoff Sources, each surface type has an accepted

coefficient of runoff, or “C” value, as listed in Table 1. Select the C value for each of the

corresponding runoff sources in your drainage area for use in the Rational Method Formula.

Best Practice

Filters preserve flow capacity and downstream detention volume, extending the useful life of the system. S5 systems have available fabric filters for 9-inch and 12-inch catch basins. EZflow can collect flows from planted sand filters or bioswales.

CATCH BASIN WITH FILTER

SPEE-D BASIN WITH DRAIN

PAVER UNDERDRAIN

TRENCH DRAIN

FLO-WELL WITH SURFACE INLET

EZFLOW IN BIOSWALE

Q = CiA Q = design peak runoff rate in cubic feet per second (cfs)

C = runoff coefficient (dimensionless)

i = rainfall intensity in inches per hour (in/hr)

A = drainage area in acres (ac)

TABLE 1

* Values are approximate. Always refer to applicable design guidelines for locally accepted runoff coefficient values.



0.5" 0.5"0.5"0.5" 0.5" 0.75"

0.75" 0.5"

0.75"

0.5"

0.5"

1.0"

1.0"

1.0"

0.75"

0.75"0.75"

0.75"

1.0"

1.5"1.0"

1.0"

1.0"

1.0"

1.0"

1.0"1.25"

1.25"

1.25"

1.5"1.5"

2.0" 1.25"

1.5"

1.5"

1.5"

1.5"

1.25"1.25"

1.75"

1.75"2.0"

2.25" 2.5"

2.75"3.0"

3.0"

2.75"

3.0" 2.5"2.75"3.0"

3.0"

2.75"

2.5"

2.5"2.25"

2.25"

2.0"

2.0"

2.0"

1.75"

0.5" 0.5"0.5"0.5" 0.5" 0.75"

0.75" 0.5"

0.75"

0.5"

0.5"

1.0"

1.0"

1.0"

0.75"

0.75"0.75"

0.75"

1.0"

1.5"1.0"

1.0"

1.0"

1.0"

1.0"

1.0"1.25"

1.25"

1.25"

1.5"1.5"

2.0" 1.25"

1.5"

1.5"

1.5"

1.5"

1.25"1.25"

1.75"

1.75"2.0"

2.25" 2.5"

2.75"3.0"

3.0"

2.75"

3.0" 2.5"2.75"3.0"

3.0"

2.75"

2.5"

2.5"2.25"

2.25"

2.0"

2.0"

2.0"

1.75"

Step 3: Determine Peak Flow (cont.)i: Selecting the rainfall intensity for peak flow calculations considers measured

precipitation patterns for the project location and the time of concentration for the

drainage area. Rainfall intensity-duration-frequency (IDF) curves are published

by the National Weather Service in the United States and are available by region.

Time of concentration (Tc) is how long it takes runoff from the most hydraulically

remote part of the drainage area to reach the outlet and depends on surface type,

surface slope and other factors. Calculating Tc and referring to the appropriate

IDF curve for the project region and selecting an appropriate storm frequency will

provide the corresponding i value for use in the Rational Method Formula.

The design storm frequency and duration selected as the design basis for an S5

system must first comply with applicable regulations and may consider other factors

including watershed sensitivity, economic implications and potential downstream

impacts. It is good practice to use a rainfall intensity (i) value that will allow for sizing

of capture device and conveyance pipe to handle a large majority of reasonably

anticipated storm events. This is especially true where backup and overflow of

stormwater at the point of capture could cause property damage or other undesirable

consequences. Using the 25-year design storm frequency with 30-minute duration

allows for safe sizing of S5 system capture devices and piping. Find your project

location and use the higher rainfall value of the enclosing delineation boundaries.

A: The area of each runoff-source surface type within a drainage area is measured

and used as the A value in the Rational Method Formula to determine peak flow.

These drainage areas can be treated individually or as a composite of surfaces or

catchment areas.

25-Year, 30-Minute Rainfall Map of the United StatesSource: National Oceanic and Atmospheric Administration (www.NOAA.gov) 30-Minute Time Event



GrateFilter

Adapter

Pipe

Basin

CATCH BASIN

Step 5: Size System ComponentsBasin, Inlet and Channel/Trench Grates

Once the runoff source is identified and peak flow is known it becomes a simple process to select the appropriately sized basins, inlets, channel

& trench drains for an S5 system. NDS grates for these components have measured open surface areas and calculated flow capacities. Using

Tables 6 and 7 in the reference section of this manual, simply choose the grate type for the capture device that will handle the calculated peak

flow, keeping in mind that the limiting flow factor for all capture devices may ultimately be the type, diameter and slope of outlet piping.

CHANNEL GRATES

Grate End Cap

End Cap

Outlet

PipeElbowChannel

Step 4: Determine Detention VolumeCalculate detention volume for a given rain event in your project area

to size detention and infiltration components. Regional standards for

calculating an onsite detention & storage volume requirement vary

greatly. These standards are developed to consider storm intensity,

patterns of land use and development, watershed sensitivity, existing

stormwater infrastructure and other factors. The volume mandated

for detention or storage for a project that increases net impervious

surfaces may be pre-determined by the regulating authority based on

type and size of development. The required detention volume is often

equal to the increase in runoff calculated as post-development runoff

minus pre-development runoff for a given rain event, resulting in no

net increase in runoff for the given rain event. Net detention volume

can be calculated by the following formula:

DV: Calculating detention volume allows for selection of the type,

quantity and configuration of detention and infiltration components.

The primary detention and infiltration components of the NDS S5

system are Flo-Well engineered dry well and EZflow engineered

infiltration trench system. To convert cubic feet to gallons simply

multiply cubic feet by 7.48.

Both post- and pre-development runoff volumes can be calculated

by the formula:

Vpost & Vpre: Both pre- and post-development runoff volumes

consider surface type, area of each surface type and the depth of

the given rain event.

C: As explained in Step 1: Identify Runoff Sources and in

calculating Q previously, each surface type has an accepted

coefficient of runoff, or “C” value, as listed in Table 1. Select the

C value for each of the corresponding runoff sources in your

drainage area for use in calculating runoff volumes.

A: The area of each runoff-source surface type within a drainage

area is measured in square feet to calculate runoff volumes. These

drainage areas can be treated individually or as a composite of

surfaces or catchment areas.

R: Stormwater regulations often govern the applicable design

storm intensity and duration, which provides a rainfall depth used

to calculate detention volume.

DV = Vpost - Vpre

DV = net detention volume in cubic feet

Vpost = post-development runoff volume in cubic feet

Vpre = pre-development runoff volume in cubic feet

Vpost = CAR orVpre = CAR

V = pre- or post-development runoff volume in cubic feet

C = coefficient of runoff (dimensionless)

A = drainage area in square feet

R = depth of rain event in inches


Smooth-Interior Pipe Discharge RatesApproximate Discharge Rates (Gallons Per Minute)

Pipe

Dia

met

er (I

nche

s)

12 1,458 2,064 2,962 3,635 4,533

10 898 1,346 1,795 2,244 2,917

8 471 718 1,010 1,211 1,571

6 229 328 493 561 741

4 80 112 157 193 260

3 30 44 63 77 103

0.5 1 2 3 5

Pipe Slope (%)

Corrugated-Interior Pipe Discharge RatesApproximate Discharge Rates (Gallons Per Minute)

Pipe

Dia

met

er (I

nche

s)

12 785 1,077 1,503 1,863 2,558

10 538 763 987 1,256 1,616

8 301 435 628 763 987

6 137 195 285 359 471

4 49 74 98 121 166

3 Not Recommended Not Recommended 38 53 69

0.5 1 2 3 5

Pipe Slope (%)


Detention & Infiltration Components

The primary S5 system components to

provide the required detention volume

and maximize infiltration are Flo-Well

engineered dry well and EZflow

engineered infiltration trench products.

Flo-Well is a modular system and can be

used singly or in series, stacked where

groundwater conditions allow and also

combined with EZflow. Flo-Well can be

used as a distribution chamber and as a

pretreatment device to allow for settling

of solids. A standard Flo-Well unit is

open-bottomed for direct infiltration, but

has a bottom plate available if needed.

The cover and side panels have 4-inch

knockouts to receive 4-inch S&D pipe and

cutout guides to accommodate NDS pipe

adapters for 3-inch to 8-inch diameter

pipes. The sides also have 1-inch

knockouts that allow for lateral diffusion

of stormwater when used with a filter

fabric wrap. Flo-Well has a full detention

capacity of 50 gallons (6.7 cubic feet)

and is around 250% more efficient than a

traditional gravel-filled dry well.

EZflow is a gravel-free engineered

infiltration trench consisting of Poly-Rock

expanded polystyrene aggregate fully

encased in a filter-fabric mesh. Standard

bundles are 10-feet long and available

with or without a slotted 3-inch, 4-inch

or 6-inch corrugated pipe. It has better

flow-through and storage volume than

traditional stone-and-pipe infiltration

trenches. The large surface area and

pore space maximizes soil contact

and stormwater infiltration. An EZflow

infiltration trench can conform to terrain

changes and existing features in the

landscape, providing design flexibility and

minimizing disturbance. EZflow bundles

with pipe are compatible with standard

corrugated internal couplings and end

caps. Detention capacities for EZflow

bundles vary with bundle diameter and

pipe, and are listed in Table 4.

FLO-WELL ENGINEERED DRY WELL

EZFLOW ENGINEERED INFILTRATION TRENCH

Pipe

Selection of conveyance pipe type, diameter

and slope must consider calculated peak flow

rates, pipe performance characteristics, S5

system configuration and site constraints.

Standard sewer & drain (S&D) pipe made

from polyvinyl chloride (PVC) with a smooth

interior is recommended for most drainage

applications. Polyethylene (PE) pipe is also

acceptable and available with either smooth

or corrugated interiors. Thicker Schedule 40

PVC pipe with proper bedding is recommended

where piping is routed under driveways and for

other load-bearing installations. Smooth-interior

and corrugated-interior pipes have measured

discharge rates based on pipe diameter and

slope as illustrated in Tables 2 and 3 to the

right. Each type and diameter of pipe has

compatible fittings and connectors.

Best Practice

Using EZflow for conveyance where possible will increase system detention capacity and infiltration and may reduce the footprint of downstream detention and infiltration areas.

TABLE 2

TABLE 3

NDS Detention and Infiltration ComponentsDETENTION VOLUME

PART NUMBER(S) PART DESCRIPTIONGALLONS CUBIC FT

50 6.7 FWAS24WH FLO-WELL ENGINEERED DRY WELL

8.8 1.2 EZ-0701A EZFLOW 7" AGGREGATE BUNDLE

11.4 1.5 EZ-0701F EZFLOW 7" BUNDLE WITH 3" PIPE





45.8 6.1 EZ-1501FB EZFLOW 15" BUNDLE WITH 6" PIPE

TABLE 4



Field LayoutThe efficient configuration of an S5 system is influenced by

several factors requiring careful consideration. Determining

a suitable location for detention and infiltration system

components may be challenging and is influenced by both

spatial constraints and subsurface limitations. Existing

infrastructure, regulatory setbacks and landform play key

roles as do soil hydrologic group and groundwater elevations.

The modular nature and flexibility of S5 infiltration and

detention components allows for scalable and adaptable

implementation conforming to site constraints.

S5 ADAPTABILITY

S5 SCALABILITY

Best Practices

• Call local utility marking services prior to any excavation including preliminary borings and percolation testing.

• Be aware of any applicable zoning ordinances, development setbacks and/or natural resource protections that may govern stormwater management in your jurisdiction.

• The lowest elevation of detention and infiltration components must be above seasonal high groundwater elevations to ensure full system capacity is available.

• Preserve existing natural hydrologic features whenever possible.

Nominal Pipe VolumePIPE

DIAMETER(INCHES)

FULL STORAGE CAPACITY (PER LINEAR FOOT)

GALLONS CUBIC FEET

3 0.4 0.05

4 0.7 0.09

6 1.5 0.20

8 2.6 0.35

10 4.1 0.55

12 5.9 0.79

S5 system piping also has a quantifiable volume

that can be used towards calculating system

detention capacity so long as the pipes are below

the system overflow invert elevation. Volumes per

linear foot for various pipe dimensions are listed

in Table 5.

TABLE 5

EZFLOW INFILTRATION TRENCH

Best Practices

Using EZflow in an infiltration trench array as shown above (a single EZ-1001F bundle atop two EZ-1501A bundles in a 30-inch wide trench) both balances and maximizes S5 detention volume and infiltration capacity.



NDS Basin and Inlet Grate Selection TableFlow Capacity

Part Number(s) Part DescriptionGPM CFS10.6 0.024 1, 2, 3 4" SQUARE GRATE

31.8 0.071 4, 5, 6, 6S 6" SQUARE GRATE

13.0 0.029 7, 8, 9 5" SQUARE GRATE

25.2 0.056 FWSD69 FLO-WELL SURFACE DRAIN INLET

28.1 0.063 552B, 553PB MINI CHANNEL BRASS GRATE

8.2 0.018 909B, 905PB 3" ROUND BRASS GRATE

8.2 0.018 915SC, 907PC 3" ROUND CHROME GRATE


16.1 0.036 917SC, 908PC 4" ROUND CHROME GRATE


7.7 0.017 913B, 914PB 5" SQUARE BRASS GRATE



31.2 0.070 78B 4" ATRIUM BRASS GRATE

68.8 0.153 90B 6" ATRIUM BRASS GRATE

104.0 0.232 930B 9" SQUARE BRASS GRATE

131.1 0.292 1230B 12" SQUARE BRASS GRATE

8.0 0.018 14, 15, 16, 16S 3" ROUND GRATE

11.8 0.026 11, 12, 13, 13S 4" ROUND GRATE

27.8 0.062 40, 50, 60, 60S 6" ROUND GRATE

35.2 0.078 10, 20, 30, 30S 8" ROUND GRATE

66.0 0.147 1040, 1050, 1060, 1060S 10" ROUND GRATE

140.7 0.314 1240, 1250, 1260 12" ROUND GRATE

261.9 0.583 1511, 1512 15" ROUND GRATE

12.2 0.027 270 2" ATRIUM GRATE

28.8 0.064 70, 72, 74, 74S 3" ATRIUM GRATE

TABLE 6

System OverflowAn overflow device must be provided for rain

events beyond the detention capacity of the S5

system. Depending on that capacity, overflow

may not be expected except during intense

storm events. Pop-up emitters or basins/adapters

with grates can provide a discharge point for

system overflow. The overflow point should

be located to allow discharge into a water-

safe area considering downstream impacts to

neighboring properties and natural resources.

Discharge system overflow to municipal

storm systems only where allowed by law.

SYSTEM OVERFLOW

Best Practices

• Either the overflow invert or other control device must be set at an elevation that ensures the detention capacity of the system is fully utilized.

• If the overflow point is located in a coastal or flood-prone area subject to storm surge, incorporation of a backflow prevention device may be advised.



NDS Channel Grate Selection TableFLOW CAPACITY

PART NUMBER(S) PART DESCRIPTIONGPM CFS

3.06 0.007 8001, 8002, 8003 MICRO CHANNEL

30.29 0.067 540, 541, 542, 543, 544, 551 MINI CHANNEL GRATE

16.64 0.037 554S, 554GR, 554GY, 554 MINI BOTANICAL PLASTIC

16.49 0.037 554CI MINI BOTANICAL CAST IRON

17.54 0.039 555S, 555GR, 555GY, 555 MINI WAVE PLASTIC

12.56 0.028 555CI MINI WAVE CAST IRON

51.27 0.114 240, 241, 242, 243, 244, 251 SPEE-D CHANNEL GRATE

23.8 0.053 252S, 252GR, 252GY, 252 SPEE-D BOTANICAL PLASTIC

27.5 0.061 252CI SPEE-D BOTANICAL CAST IRON

23.8 0.053 253S, 253GR, 253GY, 253 SPEE-D WAVE PLASTIC

22.67 0.051 253CI SPEE-D WAVE CAST IRON

72.29 0.161 714 3" PRO CHANNEL GRATE

24.26 0.054 826 5" PRO PERFORATED PLASTIC

71.95 0.160 814, 815, 816, 817, 818, 819 5" PRO PLASTIC GRATE

48.7 0.109 828 5" PRO LOAD STAR

70.05 0.156 823 5" PRO CAST IRON

42.28 0.094 836 8" PRO PERFORATED PLASTIC

92.63 0.206 837 8" PRO PLASTIC GRATE

94.37 0.210 838 8" PRO LOAD STAR

71.28 0.159 888 8" PRO CAST IRON

149.19 0.332 847 12" PRO PLASTIC

142.86 0.318 845 12" PRO CAST IRON

77.7 0.173 660, 661, 661LG, 662, 663, 664 DURA SLOPE PLASTIC GRATE

26.77 0.060 DS-670, DS-671 DURA SLOPE PERFORATED PLASTIC

23.34 0.052 DS-226, DS-228 DURA SLOPE PERFORATED STEEL GRATE

63.78 0.142 DS-231, DS-232 DURA SLOPE CAST / DUCTILE IRON GRATE

70.64 0.157 DS-221 DURA SLOPE GALVANIZED STEEL

29.2 0.065 DS-601 DURA SLOPE WEAVE PATTERN

41.32 0.092 DS-602 DURA SLOPE DIAMOND PATTERN

34.39 0.077 DS-603 DURA SLOPE TILE PATTERN

49.1 0.109 DS-604 DURA SLOPE BRICK PATTERN

72.46 0.161 DS-609 DURA SLOPE DECO SLOT

5.75 0.013 DS-660MG, DS-661MG, DS-661LGMG, DS-662MG, DS-663MG, DS-664MG, DS-665MG,

DS-817LGMG, DS-232MG

DURA SLOPE RADIUS COUPLING SLOT

TABLE 7

NDS Basin and Inlet Grate Selection Table (CONT.)Flow Capacity

Part Number(s) Part DescriptionGPM CFS52.0 0.116 75, 76, 78, 78S 4" ATRIUM GRATE

86.9 0.194 80, 81, 90, 90S 6" ATRIUM GRATE

44.2 0.098 640, 641, 642 6" x 6" x 4" SQUARE GRATE

44.2 0.098 637, 638, 639 6" x 6" x 6" SQUARE GRATE

41.6 0.093 771, 772, 773, 773S 7" SQUARE GRATE

52.5 0.117 881, 882, 883, 883S 8" SQUARE GRATE

86.9 0.194 950, 960, 970, 970S 9" SQUARE GRATE

96.4 0.215 981, 991 9" x 9" ATRIUM GRATE

114.7 0.256 980, 990, 999, 99S 9" SQUARE GRATE

66.7 0.149 913 9" SQUARE CAST IRON GRATE

189.5 0.422 915 9" SQUARE GALVANIZED STEEL GRATE

154.8 0.345 1280, 1290 12" x 12" ATRIUM GRATE

155.3 0.346 1210, 1211, 1212, 1212S 12" x 12" SQUARE GRATE

113.8 0.254 1213 12" x 12" SQUARE CAST IRON GRATE

348.1 0.775 1215 12" x 12" SQUARE GALVANIZED STEEL GRATE

74.8 0.167 1218S, 1218GR, 1218GY, 1218 12" SQUARE BOTANICAL PLASTIC

87.4 0.195 1218CI 12" SQUARE BOTANICAL CAST IRON

78.5 0.175 1224S, 1224GR, 1224GY, 1224 12" SQUARE WAVE PLASTIC

78.3 0.174 1224CI 12" SQUARE WAVE CAST IRON

247.4 0.551 1881, 1891 18" x 18" ATRIUM GRATE

264.0 0.588 1810, 1811, 1812 18" SQUARE GRATE

338.7 0.755 1813 18" x 18" SQUARE CAST IRON GRATE


708.8 1.579 2411, 2412 24" SQUARE GRATE

602.7 1.343 2413 24" SQUARE CAST IRON GRATE


21.6 0.048 D6 6" ROUND CAST IRON GRATE




147.8 0.329 D12H-WO 12" SQUARE HINGED CAST IRON GRATE

TABLE 6

REFERENCE TABLES


Category: Sustainable SitesCredit 5.1 Site Development – Protect or Restore Habitat

Credit 5.2 Site Development – Maximize Open Space

Credit 6.1 Stormwater Design – Quantity Control

Credit 6.2 Stormwater Design – Quality Control

Credit 7.1 Heat Island Effect – Nonroof

Category: Materials & ResourcesCredit 4.1 Recycled Content – Recycled Content: 10%

Credit 4.2 Recycled Content – Recycled Content: 20%

Credit 5.1 Regional Materials – 10% Extracted, Processed & Manufactured Regionally

Credit 5.2 Regional Materials – 20% Extracted, Processed & Manufactured Regionally

LEED CREDIT QUALIFICATIONS NOTES

NDS Customer Service851 N. Harvard Ave., Lindsay, CA 93247Phone: 800.726.1994 • 559.562.9888Fax: 800.726.1998 • 559.562.4488www.ndspro.com

Visit ndspro.com for specs, detail drawings and case studies

NDS has an over 40-year history manufacturing quality stormwater

management products. In that time our understanding and appreciation for

the effects of stormwater runoff on our environment has evolved, culminating

in the development of S5 Sustainable Stormwater Solutions. This evolution

towards a system-based approach to comprehensive stormwater

management represents a paradigm shift reflective of ongoing research,

changing attitudes and advancing regulations that aim to reduce runoff and

maximize groundwater recharge. NDS is committed to providing effective

solutions for the next 40 years and beyond.

design guide · design guide ndspro.com the s5 system addresses local and federal regulations by...

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