The dams is usually stacked a few high inside a brick formation. If you must go increased, widen the base just like a pyramid. The upper you need the wall top, the thicker The bottom should be. Stacking straight up will create an unstable foundation and They could slide off. https://docs.google.com/forms/d/e/1FAIpQLSdkiMAzS6Jjyov1Ucxcc9rVwrmz-VZ13PFCyxYJ4gez8l10Lg/viewform?usp=sf_link