To find the depth of a bore/well, lower a weight on a LIGHT string into the bore/well until you feel it hit the bottom. Then mark the string at the top of the well, pull it out and measure the length of the string that was down the well/bore. NOTE. You need to use a light string in deep bores/wells (light fishing line may be good). If the string is too heavy and the weight too light, the weight of the actual string can make it difficult to feel when you hit the bottom .
To find the static water level, lower a small bottle (with a little sand or gravel in it to give it weight if it is a plastic bottle) into the bore/well on the end of a LIGHT string until you feel it hit the water surface. Then mark the string at the top of the bore/well, pull it out and measure the length of the string that was down the well/bore.