Hydrographic Surveys

The USGS delivers continuous streamflow, stage (water-level), and tide data to help emergency managers and other decision makers protect life and property caused by floods and other water-related hazards.

FEMA has requested USGS expertise in hydraulics, hydrology, and mapping to generate flood insurance maps for New England.

Currently, there are 16 designated rivers in New Hampshire in need of daily mean streamflow estimates for managing instream flows. Many of New Hampshire’s Designated Rivers have current and/or historical streamflow data that may be used to extend an existing streamgages streamflow record in time through record extension techniques. Evaluating the feasibility of record extension techniques to...

The purpose of this work is to better understand the effects of dam removal on local hydraulics, fish passage, and flooding. This study is part of a larger effort to monitor ecological resilience changes at nine Hurricane Sandy coastal resiliency aquatic connectivity restoration projects. It will contribute crucial knowledge that will be used to improve aquatic connectivity system cost...

Hydrologic droughts and floods can have severe impacts on river infrastructure, water supply, and ecosystem functioning.

The flood-frequency characteristics for streamgages and regression equations for estimating flood magnitudes have been published.

As part of the National Water Budget Project, our objective is to quantify how well observed trends are simulated.