Development and Evaluation of a Record Extension Technique for Estimating Discharge at Selected Stream Sites in New Hampshire

Scientific Investigations Report 2019-5066
Prepared in cooperation with the New Hampshire Department of Environmental Services
By:  and 

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Abstract

Daily mean discharges are needed for rivers in New Hampshire for the management of instream flows. It is impractical, however, to continuously gage all streams in New Hampshire, and at many sites where information is needed, the discharge data required do not exist. For such sites, techniques for estimating discharge are available. The U.S. Geological Survey, in cooperation with the New Hampshire Department of Environmental Services, developed and evaluated the accuracy of estimated discharge records for six discontinued U.S. Geological Survey streamgages in New Hampshire.

The estimated records were developed by using the maintenance of variance extension, type 1 (MOVE.1), record extension technique and were generated for periods with concurrent observed records to allow for evaluation. The six discontinued streamgages were on New Hampshire designated rivers throughout the State and had drainage areas ranging from 35.6 to 395 square miles with little to no regulation.

Estimated records for four of the six streamgages had Nash-Sutcliffe efficiency coefficients greater than 0.85. The other two streamgages had Nash-Sutcliffe efficiency coefficients between 0.45 and 0.60. For the four streamgages with the higher Nash-Sutcliffe efficiency coefficients, more than 35 percent of the estimated record was within 15 percent of the observed record. At the other two streamgages, more than 23 percent of the estimated record was within 15 percent of the observed record.

At lower discharges (exceeded 80 percent of the time), for four of the six streamgages, more than 40 percent of the estimated record was within 15 percent of the observed record. The site with the lowest Nash-Sutcliffe efficiency coefficient had more than 14 percent of the estimated record at low discharges within 15 percent of the observed record.

Suggested Citation

Olson, S.A., and Meyerhofer, A.J., 2019, Development and evaluation of a record extension technique for estimating discharge at selected stream sites in New Hampshire: U.S. Geological Survey Scientific Investigations Report 2019–5066, 23 p., https://doi.org/10.3133/sir20195066.

ISSN: 2328-0328 (online)

Study Area

Table of Contents

  • Abstract
  • Introduction
  • Selection of Study and Reference Streamgages
  • Generation of Estimated Records From the MOVE.1 Record Extension Technique
  • Error Analysis of Estimated Record
  • Summary
  • References Cited
  • Appendix 1. Plots of Discharge Measurements at Study Streamgages and Concurrent Daily Mean Discharge at Reference Streamgages
  • Appendix 2. Flow-Duration Curves of the Observed and Estimated Daily Mean Discharges at Study Streamgages

Additional publication details

Publication type Report
Publication Subtype USGS Numbered Series
Title Development and evaluation of a record extension technique for estimating discharge at selected stream sites in New Hampshire
Series title Scientific Investigations Report
Series number 2019-5066
DOI 10.3133/sir20195066
Year Published 2019
Language English
Publisher U.S. Geological Survey
Publisher location Reston, VA
Contributing office(s) New England Water Science Center
Description iv, 23 p.
Country United States
State New Hampshire
Online Only (Y/N) Y
Additional Online Files (Y/N) N