BOTH ORBITAL AND IN SITU DATASETS HAVE DEMONSTRATED THE EXISTENCE OF ANCIENT PALEOLAKE BASINS THAT WERE FED BY DEEPLY INCISED VALLEYS ON EARLY MARS. ALTHOUGH THE EVIDENCE THAT THESE VALLEYS AND LAKES WERE FORMED BY LIQUID WATER IS NO LONGER IN SERIOUS DISPUTE MANY CRITICAL QUESTIONS REMAIN INCLUDING: (1) WHAT ENVIRONMENT DID VALLEYS AND LAKES FORM IN?; (2) HOW LONG DID THEIR ACTIVITY LAST?; (3) WHAT GEOMORPHIC PROCESSES WERE IMPORTANT TO FORM THE LANDFORMS WE OBSERVE?; (4) WHAT WERE THE CHARACTERISTICS OF THE TERRAINS THAT WERE ERODED?; (5) HOW MUCH GEOMORPHIC WORK WAS ACCOMPLISHED BY VALLEY FORMATION?; AND (6) HOW DID VALLEY FORMATION INFLUENCE THE TOPOGRAPHY OF THE MARTIAN HIGHLANDS AND VICE VERSA? UNDERSTANDING THESE QUESTIONS IS CRITICAL FOR UNDERSTANDING THE EVOLUTION OF EARLY MARS. ONE STRATEGY THAT ADDRESSES MANY OF THESE QUESTIONS IS TO STUDY THE OUTLET VALLEYS OF HYDROLOGICALLY OPEN PALEOLAKES ON MARS WHICH FORMED DURING LARGE-SCALE BREACH EVENTS WHEN THE BASINS FILLED WITH WATER AND OVERFLOWED. OPEN-BASIN LAKE OUTLET VALLEYS PROVIDE A GEOMORPHIC RECORD OF THE FLOODING AND INCISION THAT OCCURRED DURING THESE LARGE-SCALE OVERFLOW EVENTS. THE PHYSICS OF DAM BREACH AND LAKE OVERFLOW FLOODS IS WELL UNDERSTOOD FROM TERRESTRIAL EXPERIENCE. ADDITIONALLY THE SIZE OF OPEN-BASIN LAKE OUTLETS WHICH ARE SOME OF THE LARGEST VALLEYS ON MARS SUGGEST THAT LAKE OVERFLOW FLOODS WERE A MAJOR DRIVER OF LANDSCAPE EVOLUTION ON EARLY MARS; HOWEVER THERE HAVE BEEN FEW ATTEMPTS TO STUDY AND MODEL THE PROCESS OF MARTIAN LAKE OVERFLOW FLOODS. THUS WE PROPOSE A THREE-PART PROJECT WITH THE OVERARCHING GOAL OF UNDERSTANDING THE PROCESS AND RESULTANT OUTLET VALLEY MORPHOMETRY ASSOCIATED WITH LAKE OVERFLOW FLOODS ON EARLY MARS.