https://digitalcommons.usm.maine.edu/cbep-presentations/1061/thumbnail.jp

LeBlanc, Alan G.

Olcott, John Z., Jr.

Prouty Gill, Amy

English

University of Southern Maine: Digital Commons@USM

University of Southern Maine USM Digital Commons Presentations Casco Bay Estuary Partnership (CBEP) 11-4-2003 Stormwater Basins and Aesthetics – Not a Contradiction! Amy Prouty Gill City of Nashua Alan G. LeBlanc CDM John Z. Olcott Jr. CDM Follow this and additional works at: https://digitalcommons.usm.maine.edu/cbep-presentations Recommended Citation Gill, A.P., LeBlanc, A.G., & Olcott, Jr., J.Z. (2003). Stormwater Basins and Aesthetics – Not a Contradiction!. [Presentation slides]. Portland, ME: University of Southern Maine, Muskie School of Public Service, Casco Bay Estuary Partnership. This Book is brought to you for free and open access by the Casco Bay Estuary Partnership (CBEP) at USM Digital Commons. It has been accepted for inclusion in Presentations by an authorized administrator of USM Digital Commons. For more information, please contact jessica.c.hovey@maine.edu. Stormwater Basins andAesthetics – Not a Contradiction!Amy Prouty Gill – City of NashuaAlan G. LeBlanc, P.E. – CDMJohn Z. Olcott, Jr., R.L.A. - CDMNovember 4, 2003Nashua, New Hampshire – Introduction? Southern NewHampshire? Population 86,000(+)? Sewer ServicePopulation 100,000? January Average LowTemp. = 12° F? 270 miles gravity sewer(~25% of area hascombined sewers)Looking Ahead – EPA’s Final NPDESPhase II Stormwater Rule? As of 1997, experiencedas many as 197 CSOdischarges annually.? 1997: Globalassessment ofalternatives; study usedto select most cost-effective approach;accepted by state.? 1999:  City made policydecision to institute anintegrated infrastructureprogram - AdministrativeOrder issued? 2000-2003: New Cityadministration re-assessed this policy &reviewed availablealternativesStormwater Management in Nashua -Going Forward? Approach will feature combination of elementsidentified in study - storage, treatment, andlimited separation? Implementing localizedseparation, storage, and/ortreatment as necessary? Anniversary ParkStormwater DetentionBasin – FirstImplementation of ThisApproach!How This Project Evolved? Summer 2001 Flood Strikes Nashua!? Sargents Avenue Area Flooded? CDM Already Designing Sewer SeparationThroughoutNashua? Cost-Effective,Sensible SolutionNeeded!Project AreaCharacteristics? 31-Acre SuburbanNeighborhood? Undersized /OverloadedCombined Sewer? Flat Terrain? Nashua River 2Miles AwayRemedies to Flooding - Alternatives? SeparateSewers to River? Infiltration? In-Line Storage? Basin DetentionSelected Remedy? Detention Basin with LocalSewer Separation? Detain & Restrict Flow? Shave Peak, Bleed Back? Achieve Some Treatment? Re-BuildInfrastructureImplementing the Solution? $2.4M Construction Bid;12-months to SubstantialCompletion? 2-Cell Detention Basin &Stormwater Treatment UnitUpstream of Basin? Under-used Piece ofProperty Revitalized!? How to Make It All LookGood?Poorly Utilized LandCreates a “Wet Meadow”Typical BasinThe Ugly, and Unusable, Hole in theGroundKeep OutKeep Out…againKnow the Subsurface ConditionsAfter seedingYears laterOther UsesGolf Course Water HazardIrrigation SourceCreate a “Passive Recreational Park”A Featureless SiteAlternative #1 – Single Cell BasinAlternative #2 – Double Cell BasinFinal Concept and Plan – Double CellBasinPath PlacementKnow the Site UsersBasin Overflow/Spillway AreaStone Arched CulvertPrecast Concrete StructureNew Park FeaturesHandicap AccessUpper Basin Inlet AreaLower Basin Outlet AreaStones in ChannelWildlife HabitatStoneworkNative VegetationPlants in Naturalized Groupings“Showcase of Nature”Multi-Discipline DesignDedication

Stormwater Basins and Aesthetics – Not a Contradiction!

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Stormwater Basins and Aesthetics – Not a Contradiction!

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