Stormwater Retention/Detention Pond Design:   

• Calculate detention storage volume required to keep the post development discharge below the predevelopment discharge using the hydrograph method.

• Calculate detention storage volume required to keep the post development discharge below the predevelopment discharge using the triangle hydrograph method.

• Calculate detention storage volume required to keep the post development discharge below the predevelopment discharge using SCS detention volume method.

• Calculate storage volume of a stormwater retention/detention pond using the double-end area method.

• Calculate depth and water surface elevation of a storage volume in a stormwater retention/detention pond using the stage-storage relationship.

• Calculate detention/retention pond peak discharge from the known pond storage volume.

• 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.

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

• 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.

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

• 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.

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

• 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.

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

• 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.

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

• 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.

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

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

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

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

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

• Calculate horizontal saturated infiltration recovery for a retention/detention pond using the Andreyev and Wiseman Method.

• Calculate horizontal saturated infiltration recovery for a retention/detention pond using the Simplified Analytical Method.

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