These levees are referred to as dykes. These sedimentary sequences have been cut by igneous dykes and sills. The water level inside the park is regulated by means of dykes and artificial embankments. Tide gates are used in conjunction with dykes and culverts. The Karkonosze Granite is intruded by somewhat younger lamprophyre dykes. The irrigation was accomplished by the use of "shaduf", canals, channels, dykes, weirs, and reservoirs. It consists of peninsular gneiss, granites, basic dykes and laterites. The inland portion contains cultivable land recently reclaimed by a system of canals and dykes. A few metabasic dykes intrude the gneiss in the east. The burrows can be problematic for farmers, as they cause destruction of farm dykes. Among its former pastors were D. L. Dykes, Jr., and John E. Fellers. Mack, Jimmy Dykes, and Eddie Joost. Predominant rock types found here are Archaean-basic dykes, Charnockites and Gneisses. Similarly, he was a big influence on Doyle Dykes. Often these weaknesses are faults, but they may also be dykes or bedding-plane contacts.