Impacts of Increased Runoff
-
Upload
imogene-carson -
Category
Documents
-
view
28 -
download
4
description
Transcript of Impacts of Increased Runoff
![Page 1: Impacts of Increased Runoff](https://reader030.fdocuments.us/reader030/viewer/2022032804/56812a74550346895d8df9a9/html5/thumbnails/1.jpg)
Impacts of Increased RunoffLocalized floodingChanges flood plain in larger streamsChanges stream channels (deepens, widens, steeper banks)
![Page 2: Impacts of Increased Runoff](https://reader030.fdocuments.us/reader030/viewer/2022032804/56812a74550346895d8df9a9/html5/thumbnails/2.jpg)
Impaired Streams
![Page 3: Impacts of Increased Runoff](https://reader030.fdocuments.us/reader030/viewer/2022032804/56812a74550346895d8df9a9/html5/thumbnails/3.jpg)
Caveats
Annual averages, not models for local or site-specific water supply or well analysesConundrum–larger areas allow more accurate but less useful estimates; estimates for small areas not really reliable for regulatory workNeed to refine results for watersheds and subwatershed (local uses) – data limitsBudgets based on issue – drought, average times, wet periods
![Page 4: Impacts of Increased Runoff](https://reader030.fdocuments.us/reader030/viewer/2022032804/56812a74550346895d8df9a9/html5/thumbnails/4.jpg)
What is Available Water?
Surface WaterSafe yieldDrought of recordSustainable demandsNo harm to othersNo harm to streamsBased on storage and stream flow
Ground WaterDependable yieldNo harm to aquiferNo harm to othersNo harm to streamsBased on recharge and well locations
![Page 5: Impacts of Increased Runoff](https://reader030.fdocuments.us/reader030/viewer/2022032804/56812a74550346895d8df9a9/html5/thumbnails/5.jpg)
The Major Public Users (Raritan)
Surface WaterElizabethtown WaterMiddlesex WaterNew BrunswickNorth BrunswickUnited Water-MatchaponixSayreville
Ground WaterElizabethtown WaterPerth AmboyNJ American WaterMany municipalities
![Page 6: Impacts of Increased Runoff](https://reader030.fdocuments.us/reader030/viewer/2022032804/56812a74550346895d8df9a9/html5/thumbnails/6.jpg)
Why Public Supplies?
Population density exceeds levels that on-site wells can supportCost-effectivenessLink to public sewer systemsSurface supplies – 1.2 million people
![Page 7: Impacts of Increased Runoff](https://reader030.fdocuments.us/reader030/viewer/2022032804/56812a74550346895d8df9a9/html5/thumbnails/7.jpg)
Passing Flows
Control withdrawals and/or releases to minimize low flow conditionsApplies to regulated withdrawalsMajor Raritan Basin controls
South Branch at Stanton StationRaritan at ManvilleRaritan at Bound Brook
![Page 8: Impacts of Increased Runoff](https://reader030.fdocuments.us/reader030/viewer/2022032804/56812a74550346895d8df9a9/html5/thumbnails/8.jpg)
Total Available Water
Surface WaterNJWSA 225 MGDNew Brunswick 8 MGDOthers – limitedConstructed facilities
Ground Water85-135 MGD totalAmount uncertainNaturally availableNot concentrated
![Page 9: Impacts of Increased Runoff](https://reader030.fdocuments.us/reader030/viewer/2022032804/56812a74550346895d8df9a9/html5/thumbnails/9.jpg)
Projected Water DemandsRaritan River Basin Water Supply Demands
225
250
275
300
325
350
1990 2000 2010 2020 2030 2040
Year
MG
D
Low Projections High Projections
Includes demands from out of basin
![Page 10: Impacts of Increased Runoff](https://reader030.fdocuments.us/reader030/viewer/2022032804/56812a74550346895d8df9a9/html5/thumbnails/10.jpg)
Assessment
Basin demand approaching available supplies before 2040 – new surface water project neededGround water demands can exceed local supplies in shorter times – proved by dry domestic wells in droughtMinimal additional ground water
![Page 11: Impacts of Increased Runoff](https://reader030.fdocuments.us/reader030/viewer/2022032804/56812a74550346895d8df9a9/html5/thumbnails/11.jpg)
Statewide Water Supply Plan
RecommendationsConservationProtect existing sourcesKingston Quarry if available in timeConfluence Pumping Station second bestSix Mile Run – wait
![Page 12: Impacts of Increased Runoff](https://reader030.fdocuments.us/reader030/viewer/2022032804/56812a74550346895d8df9a9/html5/thumbnails/12.jpg)
CaveatsPollution – can reduce availabilityGround water – demands must be spread to avoid overdrawing local aquifersGround water – estimates are roughConservation – use rates can changePassing flows – influence safe yieldsHydrology – development can change itClimate – changes affect yields
![Page 13: Impacts of Increased Runoff](https://reader030.fdocuments.us/reader030/viewer/2022032804/56812a74550346895d8df9a9/html5/thumbnails/13.jpg)
NJDEP Water Budget Project
Focusing on watersheds (HUC-11)Documenting site and size of all permitted water withdrawalsEstimating ground water rechargeEstimating flow needs (volume and timing) for aquatic ecosystemsDeveloping water budgets in 2004
![Page 14: Impacts of Increased Runoff](https://reader030.fdocuments.us/reader030/viewer/2022032804/56812a74550346895d8df9a9/html5/thumbnails/14.jpg)
Key Issues for Hunterdon County
Rely on local resources or import? Scale?Surface water or ground water?If ground water, how conservatively should supplies be estimated?What level of knowledge is sufficient?What roles for conservation, recycling and reuse of water?What level of aquatic ecosystem protection?What are the implications for master plans?