Capture area ( DTA) Accumulating basin of Gadjah Mungkur consist of some set of fisiografi that is set of Mount of Lawu, Mountain Of Glorious Batur, Mountain Of South have Stone [to] of Vulkanis and also Mountain of South have Limestone.
1. [In] DTA Accumulating basin of Gadjah Mungkur have happened erosion enough heavily marked [by] the existence of mains rock emerging, ditch erosion and sedimentation. From 102 Sub of DAS [in] DAS Solo covering 23 sub-province region, there [is] 28 Sub of DAS owning big erosion potency. erosion of Aktual smallest that happened [is] 4,72 ton/Ha/th [in] Sub of DAS Precel and biggest erosion happened [in] Sub of DAS Dengkeng equal to 195,84 ton/Ha/th ( Anonimus, 2002).
2. Capture area irrigate [among/between] Natty Mount and its Lawu farm very fertile so that cause growth of industry and settlement [in] this [is] region very fast. Affect that happened [is] household waste and factory waste will contaminate ground water, stream coefficient will mount so that erosion even also potentially mount also.
3. Watercourse of Bengawan Solo [in] area of Sragen, Ngawi, [in] upstate come from area Mountain of Kendeng have type [to] of intermitten ( emiting a stream of when the rains) because water capture area [do] not too wide [of] storey;level pass of low rock ( napal), and also rainfall ± 2000 mm / th with dry month;moon 5-6 months with scarce and high stream koefisiensi [of] ground water.
4. Bengawan Madiun emit a stream of from Sub-Province area of Ponorogo, Madiun and of Magetan. Part of pate;upstream [in] sub-province area of Ponorogo the condition of farm very [is] critical marked [by] the existence of ditch erosion, slide mains rock appearance and farm ( Anonimus, 2002).
5. Area of Bengawan Solo Go downstream by fisiografi in the form of Mountain of Apex [in] northside river, Mountain of Kendeng [in] side river south and plain of aluvial.
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