QPPQ Stream Flow Method

For more information about the Instream Flow Program please visit the ISF webpage.

QPPQ Transform Method  – Final Reports

The update and testing of the QPPQ method for calculating daily stream flows at any location was conducted in two parts. The two reports describing the update methods and the testing are provided below.

Public Information Meeting  – August 27, 2018

NHDES held an information meeting describing the second phase of testing of a method for determining historical daily stream flows at ungaged locations known as the QPPQ Transform Method. The meeting was held August 27, 2018 from 2:00 to 3:30 pm at the NHDES offices in Concord. Neil Fennessey of HYSR described how the method was tested and the results. A pdf of the presentation is available at HYSR NHDES Negative Run-length Presentation 8-27-2018.

Public Information Meeting – March 29, 2018

NHDES held an information meeting describing a method for determining historical daily stream flows at ungaged locations known as the QPPQ Transform Method. At the meeting, held March 29, 2018 from 10:00 to 11:30 am at the NHDES offices in Concord, HYSR and NHDES presented details of how the method works and how it was updated. This meeting was open to the public.

The Instream Flow Program uses multi-year records of historical stream flow data in the model that determines protected instream flow criteria. Daily data records are needed for Designated Rivers where there are no gages. These data can be developed using measured flows from nearby rivers and regression analysis of watershed parameters affecting stream flow. The results of this project will be used to develop the protected instream flow criteria for ungaged designated rivers.

NHDES has contracted with HYSR, the author of the QPPQ Transform Method currently used by state and federal government agencies to determine historical stream flows at ungaged locations, to evaluate this application. This project updates the original QPPQ method using new land and river characteristics data that were developed after the QPPQ method was first published and are available now via GIS. This project acts as a proof-of-concept that the updated QPPQ Transform Method will result in accurate stream flow data.

HYSR’s project report “A Final Report on the Update of a Regional Streamflow Duration Curve Model for the Northeast United States and the Generation of Estimated Daily Flows Using the QPPQ Transform Method at Ungaged Sites in New Hampshire” is posted below:

The presentations given on March 29, 2018 are posted below: