Portfolio Type: Hydrological Studies & Dams

Hydrologic multi-state model for researching fluvial-tidal interactions This model is designed to assist University researchers with understanding the freshwater component of the Saco River outlet area where tidal and freshwater flows meet and interact. The model was developed using ArcGIS, Geo HMS and HECHMS to create a simulation of the Saco River Basin. The model can be used to simulate design storms such as a 100-year, 24-hour rainfall event or can simulate the impacts of actual recorded NEXRAD data from real storm events. The model incorporates GIS based land use, watershed, soils, and topographic information, as well as river sections,…

Northstar Hydro prepared a hydrologic and hydraulic analyses for the planned breach/removal of the dam that impounded a lake originally built in the 1940’s as a water supply for an industrial mill in Pennsylvania.  The lake owner proposed to remove the dam that impounds lake and restore the stream to a free-flowing natural state.  Northstar analyzed the watershed hydrology using GIS tools and model HECHMS and studied dam removal affects using model HECRAS.

Determined water supply for firefighting to improved insurance certification The purpose of this project is to evaluate whether the 23 dry hydrants within and adjacent to the Town of Bridgton meet the certification requirements under the Insurance Services Office’s (ISO) Public Fire Suppression Rating Schedule. The certification requires that the water source have the ability to flow 250 gallons per minute (gpm) for a two hour period under the 50-year drought condition. Thus under the 50-year drought condition each ponded source must have 30,000 gallons or 4,010 cubic feet of water available. At the time of this report Bridgton did…

Older dam modifications were causing property damage, dam was redesigned after hydrological study Northstar prepared a hydrologic and hydraulic study of the Maranacook Lake watershed and the outlet dam.  The study was designed to understand flow through the watershed, outflow through the dam and potential modifications to the dam to improve lake level management options. Residents along the lake have been experiencing higher lake levels since the dam was reconstructed several years ago. Northstar constructed a HECHMS model of the watershed,  and a HECRAS hydraulic model for the bridge and dam .  Northstar continues to work with the designer, the Towns…