On Civiltoday.com, find the article summary about 'Dumpy Level Survey'. From this summary, explain what a Dumpy Level is commonly used for and identify one key aspect of knowledge that is incomplete without understanding leveling. Provide these details in your answer.
Navigate to 'http://civiltoday.com/' Locate the article summary titled 'Dumpy Level Survey–What, Where, How, Parts' on the homepage. Extract what the Dumpy Level is commonly used for from the summary. Identify one key aspect of knowledge that is incomplete without understanding leveling from the summary. Synthesize this information into a concise answer.
The Dumpy Level is identified as a 'commonly used leveling instrument'. It is stated that 'Knowledge of surveying is incomplete without the knowledge of leveling'. All information is sourced directly from the 'Dumpy Level Survey–What, Where, How, Parts' article summary visible on the Civiltoday.com homepage.