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###### Stormwater Retention/Detention Pond Design:

Hydrograph Method
• Calculate detention storage volume required to keep the post development discharge below the predevelopment discharge using the hydrograph method.
Triangle Hydrograph Method
• Calculate detention storage volume required to keep the post development discharge below the predevelopment discharge using the triangle hydrograph method.
SCS Detention Volume
• Calculate detention storage volume required to keep the post development discharge below the predevelopment discharge using SCS detention volume method.
Pond Storage Volume
• Calculate storage volume of a stormwater retention/detention pond using the double-end area method.
Stage Storage Depth
• Calculate depth and water surface elevation of a storage volume in a stormwater retention/detention pond using the stage-storage relationship.
Estimate Pond Discharge
• Calculate detention/retention pond peak discharge from the known pond storage volume.
Pipe Outlet Control
• Calculate the required diameter for a pipe outlet flow control to match the pre-development peak runoff rate for a stormwater retention or detention pond.

Pipe Outlet Control Discharge
• Calculate the discharge from a pipe outlet flow control for a stormwater retention or detention pond.

Orifice Outlet Control
• Calculate the required area for an orifice outlet flow control under free discharge to match the pre-development peak runoff rate for a stormwater retention or detention pond.

Orifice Outlet Control Discharge
• Calculate the discharge for an orifice outlet flow control under free discharge for a stormwater retention or detention pond.

FHWA Orifice Outlet Control
• Calculate the required area from an orifice outlet flow control under free discharge to match the pre-development peak runoff rate for a stormwater retention or detention pond using the FHWA formula.

FHWA Orifice Outlet Control Discharge
• Calculate the discharge from an orifice outlet flow control under free discharge for a stormwater retention or detention pond using the FHWA formula.

FHWA Circular Orifice Outlet Control
• Calculate the required diameter for a circular orifice outlet flow control under free discharge to match the pre-development peak runoff rate for a stormwater retention or detention pond using the FHWA formula.

FHWA Circular Orifice Outlet Control Discharge
• Calculate the discharge from a circular orifice outlet flow control under free discharge for a stormwater retention or detention pond using the FHWA formula.

Weir Outlet Control
• Calculate the required length of weir for a weir outlet flow control under free discharge to match the pre-development peak runoff rate for a stormwater retention or detention pond.

Weir Outlet Control Discharge
• Calculate the discharge from a weir outlet flow control under free discharge for a stormwater retention or detention pond.

V-Notch Weir Outlet Control
• Calculate the required angle for a V-notch weir outlet flow control under free discharge to match the pre-development peak runoff rate for a stormwater retention or detention pond.

V-Notch Weir Outlet Control Discharge
• Calculate the discharge from a V-notch weir outlet flow control under free discharge for a stormwater retention or detention pond.

Underdrain Spacing
• Calculate the required spacing for the laterals of an underdrain system for a stormwater retention or detention pond.

Underdrain Lateral Area
• Calculate the area served by each lateral and the total area served for an underdrain system for a stormwater retention or detention pond.

Underdrain Discharge
• Calculate the discharge from an underdrain system for a stormwater retention or detention pond.

Unsaturated Vertical Infiltration
• Calculate vertical unsaturated infiltration recovery for a retention/detention pond.

Saturated Horizontal Infiltration - AW
• Calculate horizontal saturated infiltration recovery for a retention/detention pond using the Andreyev and Wiseman Method.

Saturated Horizontal Infiltration - SAM
• Calculate horizontal saturated infiltration recovery for a retention/detention pond using the Simplified Analytical Method.

SCS Pond Routing - 24 hr
• Route up to a 24 hour SCS storm hydrograph for a watershed area through a retention/detention pond.

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