EXECUTIVE SUMMARY

LAND USE DIRECTION BASED ON ENVIRONMENTAL GEOLOGY ASPECTS IN NGADIRGO, WONOLOPO AND WONOPLUMBON SUBDISTRICT

Created To Fulfill Environmental Geology Subject Task

(TKP 250)

Lecture : Ir. Hadi Nugroho Dipl. EGS, MT

By : Group IA

Renny Desiana 21040112130051 Dwitantri Rezkiandini 21040112130071 Aulia Adhiyajna F. 21040112130089 Ferdianta Wahyu N. Pratama 21040112130097 Oktaviana Rahayu J.A. 21040112130099 Yosephine Purba 21040112140041 Fajar Hadhiyanto Wibowo 21040112140125

DEPARTMENT OF URBAN AND REGIONAL PLANNING

FACULTY OF ENGINEERING DIPONEGORO UNIVERSITY

SEMARANG

2013

ii

TABLE OF CONTENTS

TABLE OF CONTENTS ……………………………………………………………….. ii

TABLE LISTS ……………………………………………………………….. iii

CHAPTER I INTRODUCTION ……………………………………………………………….. 1

1.1 Background ……………………………………………………………….. 1

1.2 Issues ……………………………………………………………….. 2

1.3 Goals and Purposes ……………………………………………………………….. 2

1.3.1 The Purposes ……………………………………………………………….. 2

1.3.2 Target ……………………………………………………………….. 2

1.4 Scope ……………………………………………………………….. 3

1.4.1 Regional Scope ……………………………………………………………….. 3

1.4.2 Scope of Content ……………………………………………………………….. 3

1.5 Methodology ……………………………………………………………….. 3

1.5.1Data Collection

Methods ……………………………………………………………….. 3

1.5.2 Analysis Methods ……………………………………………………………….. 4

CHAPTER II DISCUSSION ……………………………………………………………….. 5

2.1 Regional’s

Characteristic ……………………………………………………………….. 5

2.1.1 Geographical

Location ……………………………………………………………….. 5

2.1.2 Physically

Characteristic ……………………………………………………………….. 5

CHAPTER III CONCLUSION ……………………………………………………………….. 18

iii

TABLE LISTS

Table II.1 SWOT Analysis Ngadirgo

Village, Wonolopo and

Wonoplumbon

……………………………………………………… 11

Table II.2 Slope Analysis Ngadirgo

Village, Wonolopo and

Wonoplumbon

……………………………………………………… 12

Table II.3 Analysis of Rainfall Village

Ngadirgo, Wonolopo, and

Wonoplumbon

……………………………………………………… 12

Table II.4 Analysis of Slope Village

Ngadirgo, Wonolopo, and

Wonoplumbon

……………………………………………………… 13

Table II.5 SWOT Analysis Ngadirgo Village, Wonolopo, and Wonoplumbon

……………………………………………………… 14

1

CHAPTER I

INTRODUCTION

1.1 Background

Environmental Geology is essentially a science of applied geology in an effort

aimed at utilizing natural resources and energy efficiently and effectively to meet the

needs of human life in the present and the future by reducing the environmental impact

caused as much as possible (Iqbal, 2011). Meanwhile, according to Hrasna (2002), states

that with respect to the original definition of the environment, the Environmental Geology

can be defined as part of the lithosphere, which directly affects the condition of the

existence and development of society, people who exploit and which converts the

environment.

From the above statements, it can be concluded that Environmental Geology is a

science which to study the relationship between aspects of geology, natural resources,

and human being. This relationship takes part in solving the problems of land use, minimize

disasters that may occur due to human activities, and maximizing the potential of existing

resources in a region.

Environmental Geology Science has nine aspects of geology consisting of

morphology, topography, lithology, geological structure, stratigraphy, hydrology,

climatology, hydrogeology, and geologic hazards. These aspects will provide an important

information for planning the world. The real benefit of the geological aspects is as a guide

in determining aspects of land use of an area. By considerations of this geology aspects,

land use mapping of an area is expected can be optimal, and can reduce the environmental

impact that could arise in the future.

Based on the descriptions above and seeing the physical circumstances in District

Mijen, so it will need a further assessment of the function of land use in the District Mijen,

particularly in sub-villages which serve as study area that is Ngadirgo Village, Village

Wonolopo, and Wonoplumbon Village. Green open space area is dominating several

villages in the district Mijen. One of the problems that can be studied further is the

conversion of green open space into residential areas. Many residential areas were built in

the green open space that are not really suitable to be conversed as it is.

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With a more depth and detailed assessment to the sub-urban villages in the study

area, is expected to provide a major contribution to the development in those sub-urban

villages. Assessment which based on the environment al geology aspects would make a

future planning will be done more sustainable so that all kinds of geological hazards that

may arise in the future will be minimized.

1.2 Issues

The problems which being the main focus of this paper is on the direction of land

use in accordance with aspects of environmental geology in the Ngadirgo Village,

Wonolopo Village, and Wonoplumbon Village so that development can be done more

attention to environmental aspects and to minimize hazards that could occur in the future.

This problem can be analyzed through analysis of land suitability analysis is based on

referrals and Spatial Planning (Spatial) as determined by the relevant government, the

Regional Planning Board of Semarang. The land suitability identification of study area

based on the potential and constraints of the geological aspects found in the field, namely

morphology, topography, lithology, geological structure, strartigrafi, hydrology,

climatology, hydrogeology, and geologic hazards.

1.3 Goals and Purposes

1.3.1 The Purposes

The purpose of making this paper is to analyze and identify the physical condition of

Ngadirgo Village, Wonolopo Village, and Wonoplumbon village in the Mijen district so

as to provide a proper land use guidance which appropriate land use analysis and land

suitability function of the area in accordance with the geological aspects.

1.3.2 Target

1. Analyze the study area borders and the state of the study area in general.

2. Analyze the study area issues which are related to environment al geology aspects.

3. Identify environmental geology aspects in the study area including morphology,

topography, lithology, geological structure, stratigraphy, hydrology, climatology,

hydrogeology, and geologic hazards.

4. Assess the area function of the study area.

5. Analyzing potential and constraints in the study area according to their natural

condition.

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6. Provide recommendations based on the function of the area, the potential and

constraints in the study area.

1.4 Scope

1.4.1 Regional Scope

The scope are Ngadirgo Village, Wonolopo Village, and Wonoplumbon Village. These

villages are part of the Mijen district. Ngadirgo Village broad is 10.01km2, Wonolopo

Village broad is 2.21 km2, and Wonoplumbon Village broad is 6.80 km2. These three

villages have administrative boundaries, namely:

- North : District Ngaliyan

- South : Village Jatisari

- West : Kendal

- East : Village Pesantren

1.4.2 Scope of Content

The material discussed in this paper is the physical state of Ngadirgo Village, Wonolopo

Village, and Wonoplumbon Village, District Mijen, Semarang based on geological

aspects, namely:

- Morphology

- Topography

- Lithology

- Geological Structure

- Stratigraphy

- Hydrology

- Climatology

- Hydrogeology

- Geological Hazards

1.5 Methodology

In the discussion and preparation of this paper using two methods, namely:

1.5.1 Data Collection Methods

Data that required in the preparation of this paper is the primary data and secondary

data.

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- Primary Data

Primary data is data which collected directly by the researcher of the respondents,

not derived from data collection has ever done before. Primary data collection

techniques can be done through questionnaire, interviews, focus group

discussions, and observations.

- Secondary Data

Secondary data is data that has been collected by someone else and not prepared

for the preparation of the paper, but can be used for data collection purposes.

1.5.2 Analysis Methods

The analysis method consisted of quantitative analysis and qualitative analysis.

- Quantitative Analysis Method

This analysis used an analytical tool in numeric form, namely scoring factor that

serves to determine the function of the area based on existing scores. The

variables included in the scoring factors are topography, climatology, and

lithology.

- Qualitative Analysis Method

This analysis is used to analyze the data in the form of non-numeric or data that

can not be translated in the form of numeric variable. Variabel that using

qualitative analysis methods, namely structural geology, stratigraphy, hydrology,

climatology, hydrogeology, geological hazards and land use. analysis tools can be:

a. Descriptive analysis, the data processing is done by giving a description of the

study area.

b. Normative analysis is used to analyze the study area using the provisions or

regulations.

c. SWOT Analysis, is a method used to determine and analyze Strength,

Weakness, Opportunity, and Threat.

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CHAPTER II

DISCUSSION

2.1 Regional’s Characteristic

2.1.1 Geographical Location

The total area of Ngadirgo, Wonolopo and Wonoplumbon village is 19.02 km2 with

administrative boundaries, namely:

- North : District Ngaliyan

- South : Jatisari Village

- West : Kendal Regency

- East : Pesantren Village

2.1.2 Physically Characteristic

a. Morphology

The morphologic type of Wonolopo, Ngadirgo and Wonoplumbon Village

composed of rather flat, wavy and hilly. With the landscape form is structural ramp

hill with denudational process. Geomorphic units namely hills geomorphic with the

slopes ranging from 2 -15% and has a height of 30-500 asl. This area is suitable for

agriculture and plantations, but the areas that have been denunationed has a

disadvantage, it is the binder composition of rocks and soil is not compact, so it will

be susceptible to weathering, erosion and landslides.

b. Topography

Wonolopo, Ngadirgo and Wonoplumbon Village have topography level with a

slope which is divided into five sections, namely:

- Flat areas with slope 0-8% found in the eastern part of the Ngadirgo Village.

This location is suitable to utilize as an area settlements.

- Sloping areas with slopes level of 8-15% is located in almost parts of the village.

Region with a slope level of 8 -15% is cultivated area, that could be used for a

wide range of human activities depend on the physical conditions. Generally,

this area is used for residential, farm and moor

- A rather steep region with slopes level of 15-25% is located in almost of the

Wonoplumbon village, and several western parts of Ngadirgo and Wonolopo

village. This region is utilized as production forests and plantations, this are is

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a useful buffer to place water flows and also maintains the characteristics’ of

protected areas. There are also settlements in some regions, this location is

not true at all, because it will be vulnerable to avalanches even just for a small

frequency.

- A rather steep Region with slopes levels 25-40% located in the south of

Wonoplumbon village. This area can be used as buffer zones or protected

area, but in Wonoplumbon Village, it used for the buffer zone. This region

relatively close to the river that used by citizens for garden, this area is very

prone to soil erosion in the river cliff.

- Areas with very steep slopes > 40% there is little area in the southern part of

the Wonoplumbon village. This area is suitable as a protected and buffer area.

But at the Wonoplumbon Village can only be used as regions of the

plantations, forests and agriculture.

-

c. Lithological

There are 2 types of rocks in the Ngadirgo, Wonolopo and Wonoplumbon

Village, both rock types are:

a) Basic Sedimentary Rocks

One type of this rock is sandstone, which is found in the northern part of the

Ngadirgo and Wonoplumbon village. Some kinds of these rocks are

sedimentation of clay, silt rocks, sand rocks. Characteristics of these rocks is

not having a strong tie between the rocks matix, so it does not fit established

buildings, especially the clay rocks in Blorong River in Wonoplumbon is highly

unstable.

b) Volcanic Rock Breccia

These rocks are located throughout Wonolopo Village, and the southern part

Wonoplumbon and Ngadirgo Village. These rocks has spread most widely in

Ngadirgo Village, Wonolopo Village, and Wonoplumbon village.

There are 2 types of soil are scattered in the Village Ngadirgo, Wonolopo

Village, and Village Wonoplumbon. The second type of soil it is:

a) Latosols Reddish Brown

This type of land scattered throughout the entire territory Village

Wonoplumbon and Ngadirgo and most areas of the Wonolopo Village. Latosols

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reddish brown is the most dominant soil types in the Village Ngadirgo,

Wonolopo Village, and Wonoplumbon Village.

b) Latosols Brown

Distribution of soil types is not too broad. Latosols brown soil types found at

the Village tenggar Ngadirgo.

The soil fertility ranged from moderate to low, but the land latosols have a

high level of soil productivity due to a soil that is loose. In the village Ngadirgo,

Wonolopo and Wonoplumbon most of the lands used for plantations, moor

and forest. For use as paddy fields, latosols soil can be utilized optimally when

its location was around the river banks. latosols is good enough in retaining

water and erosion and good enough to get up in the building there on, except

large-scale manufacturing because in the dry season the soil is very susceptible

to evaporation that causing less solid constituent elements of the matrix and

causing landslides.

d. Geological Structures

Geological structures contained in the Village Ngadirgo, Wonolopo and

Wonoplumbon according to spatial maps and Geology Map sheet Semarang-

Magelang is a geological fault structure. The fault lines transverse section headed

southwest to the north village Wonoplumbon and turn to the west and south

Ngadirgo and Wonoplumbon village. In the existing situation, can not find the

original formation of the fault, but the fault indication can be identified in the river

cliffs which resulted in a sharper bend in the river. Geological structures that can be

found in the geological structure Wonoplumbon are stout on the rocks in the

border river silt Blorong.

On the fault lines in the west to the east village Ngadirgo, not so according to

established buildings, regardless of the possibility of shifting earth or landslides,

but more due to this fault line has a fairly steep slope level with the middle ground

motion. But the fault lines in the southern village Wonoplumbon still be sought to

build residential buildings such as the condition of relatively flat terrain with the

type of ground motion is very low. However, the point of the construction site

should be far from the border river Blorong to minimize the occurrence of

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landslide hazards by the brunt of the river flow is sufficient. For ground

movement, is divided into three, namely:

- Very Low Movement, located on the slopes of <15% are in almost Wolopo,

Ngadirgo and Wonoplumbon areas.

- Low Movement, situated in 15% - 25% area that is in a minority in Wolopo,

Ngadirgo and Wonoplumbon village.

- Middle Movement, located on the slope ramps 8-15% to the steep 25-40%

spread Nagdrgo, Wonolopo and Wonoplumbon.

-

e. Stratigraphy

Formations that are found are Kaligetas Formation with the main rock

constituent is breccia, tuffaceous sandstone and clay rocks. Clay rocks and breccia

rocks can be found east of the river Blorong or around the river banks. In addition,

there is also a rock formations Winch that form intercalation in the village

Wonoplumbon limestone rock breccia and conglomerate rock. Because most of

the stratigraphy in the Village Ngadirgo, Wonolopo and Wonoplumbon consists of

breccia and sandstone rocks, the building was set up especially for large buildings

should be done more in the assessment.

f. Hidrology

Surface water flow in the Village Ngadirgo, Wonolopo, and Wonoplumbon can

be seen on the river Blorong and Plumbon River. Blorong river flows along the

village Wonoplumbon with total length of the river is 93 km. Blorong river water

discharge in the dry season as much as 4.053 m3/second, while the rainy season is

as much as 7,686 m3/second. Watershed Blorong much more profusely and have a

fairly wide river length of about 3-5 meters. This condition is very good to be used

as agricultural areas that use irrigation water from the river to the state of the farm

remains in the wet conditions. Unlike the Blorong river, stream Plumbon quieter so

that in this region there exist any river settlement, discharge water does not pose a

hazard as erosion or landslides.

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g. Climatological

Climatological conditions in the Wonoplumbon, Wonolopo and Ngadirgo

village roughly equal to the entire state of climatology Mijen District. Have a total

average rainfall per year from 27.7 to 34.8 mm. With temperatures average

minimum measured in Semarang Climatology Station varies from 21.1 ° C in January

to 24.6 ° C in May, and the average maximum temperature varies from 29.9 ° C to

32.9 ° C. Monthly wind speed based on the average of Semarang BMKG station

varies from 215 km / day in August to 286 km / day in January. This condition is very

suitable for the cultivation of crops because the plants will get enough water

supply from rain water. Moreover, with a high amount of rainfall will also still be

able to optimize the utilization of wet farming.

h. Hydrogeological

Wonolopo, Ngadirgo, and Wonoplumbon village have hydrogeologic

characteristics local aquifers and productive. Middle productivity of aquifers are

found in all regions throughout the Village Ngadirgo Wonoplumbon, and most of

the village Wonolopo with water discharge of more than 10 liters / sec and has a

good water quality. Discharge water is good enough for the water used by

residents as a water resource of residential areas. To get water, digging wells to a

depth of 10-15 meters. In addition, the productivity of the aquifer are very suitable

to utilize wetlands for agriculture and also for the plantation. Meanwhile, there is a

local aquifer productivity at a fraction Village Wonolopo. The condition means that

the groundwater reserves in the Village Wonolopo somewhat not so abundant in

some parts. This condition is not suitable for agricultural use by utilizing ground

water, but rather used as irrigated agriculture by utilizing the river and also take

advantage of high rainfall.

i. Geological Hazards

Problems found in the Village District Mijen especially Wonoplumbon,

Wonolopo and Ngadirgo is ground motion. However, the ground movement are

relatively rare because the district Mijen generally are at low ground motion zone.

In addition, other geological hazards is related denudasional process that resulted

in rock weathering. This is due to weathering of soils and rocks do not have a

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holding capacity soil / rock solid or have high levels of compaction between the low

matrix. This will lead to erosion and landslide geological hazards, especially on

steep slopes.

j. Land Use

Aspects of land use contained in the Village Ngadirgo, Wonolopo and

Wonoplumbon consists of five types of land uses. Among them are permanent

production forest areas, plantation areas, farming, moor and settlements.

Production forest spread in every village, but in the area large enough to be in the

Village Wonoplumbon. Where in this village, the trees are planted in production

forest is a tree that can produce products, such as rubber tree rubber used by

citizens to be sold and used by residents teak wood for sale.

For this type of land use as plantations, widely used by residents to plant

some trees that do not have a big hard rod, such as for planting some vegetables

such as peppers and tomatoes, for cassava planting trees and some trees such as

betel vine and others. Where to watering this plantations, residents take

advantage of the river flow and flow Blorong Plumbon river which flows through

the three villages. Similarly, land use as plantations, pa da agricultural land that is

widely available in the Village Ngadirgo and Wonolopo also use the river, the river

flow Plumbon. So that kind of rice fields in two villages there is more directed at

the irrigated water supply does not depend on the intensity of rainfall. Many types

of plants grown by the residents is rice. Which is a very suitable time to plant rice

during the rainy season is due to the amount of water to irrigate rice fields abound.

Land use is not much different from the dry land farming, but the land is

planted tree species more diverse. Surrounding communities utilize the dry land to

plant moringa trees, tree roots like galangal, turmeric and all kinds of tubers. While

land use settlements scattered in every village, but a large number of extents

present in Wonolopo Village. A large number of settlements in the affected villages

in this district because there Mijen district government offices, there Mijen markets

were trading centers in the District Mijen and there are also several other facilities,

such as banking. In the existing situation in the Village Ngadirgo, Wonolopo and

Wonoplu mbon also found that land use spatial violate the rules. Such as the

transfer function of land that had a teak tree plantation cleared for peanuts.

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Another problem is the people's houses in the buffer zone that should not be used

as a residential area.

k. Potential and Constraints

Table II.1

SWOT Analysis Ngadirgo Village, Wonolopo and Wonoplumbon

Internal

Eksternal

STRENGTH

1. Soil types Latosol who has a pretty good level of fertility

2. There is a fairly heavy Blorongwatershed flow

3. Prodektif aquifers are High rainfall Cultivated area is fairly dominate

WEAKNESS

1. Ground motion is less stable in some places

2. Holding capacity is less solid ground

3. Steep slope ramps level Prone to landslides and bank erosion.

OPPORTUNITIES 1. Regulations on land use clear 2. Improved technology in the

future 3. Increased investment or

investment

1. To do an agriculture-based activities such as gardening, farming. This is done in order to increase the rate of the general economy Mijen district.

2. Settlement can be made on the basis tetapa cultivated area with state government regulations and environmental conditions.

1. Establishing a partnership between the government and the private sector to understand and comprehend the physical condition of a region that is done the Development tertruktur and still consider the physical condition of the environment.

2. Development is done by calculating the details of cultural influences - such as the dangers posed by utilizing appropriate technology.

THREAT 1. Any land use that violates the

rules of spatial 2. The transformation of the area

around a watershed 3. The total population will be

growing

1. With increasing population, the need for housing will increase, determining the location of the designated residential areas is necessary, to conform to aspects of land use has been determined by the spatial and also according to the physical condition of the area to be used as the settlement. In order to minimize the danger that came in later.

1. Not doing destruction of vegetation around the Sar river to prevent erosion on river banks. And also so that watersheds can be maintained existence.

2. Development is done should pay attention to minimizing the environmental aspects of geological hazards that may occur.

Source: Group Analysis, 2013

From the SWOT table above it can be concluded that the Village Ngadirgo,

Wonolopo and soil type latosols Wonoplumbon reddish brown and has a high

density of river water and continuous so that it can be used for plantation and

agriculture, while the relatively flat terrain can be utilized as a residential

development of the area. But there is also a river in the River bank erosion along

the Village Wonoplumbon Blorong, it happens because of river bank erosion by

water flowing from the top of a cliff or by the brunt of the strong flow of the river

bend in the river, so the area is located near the banks of the river is very

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dangerous if used as a settlement. Kelurahan Ngadirgo, Wonoplumbon, and

Wonolopo ground motion zone are at medium to very low is not so worrying,

because the circumstances existing at the sub-village could not be found or

identified the danger of a very large ground motion effects.

l. Scoring Analysis

Spatial analysis of the carrying capacity of this land is a consideration that is

used to determine the appropriate land use patterns for micro areas in the

northern part of the village Ngadirgo, the southern side Wonolopo, Wonoplumbon

western part and the eastern part of the village Ngadirgo. This analysis will provide

information about the suitability of land suitable for the region. To determine the

function of a local area we use analysis tool analyzes the scoring. Scoring is based

on analysis of the topographic slope aspect, namely the intensity of the rainfall

climatology on average, and the type of soil lithology. Benchmark used for scoring

analysis based on criteria derived from the table Ministerial Decree

No.837/KTPS/UM/II/1980 and No.683/KPTS/UM/VII/1981.

a) Slope Analysis

Slope analysis can be performed based on the table below:

Table II.2

Slope Analysis Ngadirgo Village, Wonolopo and Wonoplumbon

No. Class Slope (%) Description Score

1 I 0-8 Flat 20

2 II 8-15 Ramps 40

3 III 15-25 Kinda Steep 60

4 IV 25-45 Steep 80

5 V >45 Very Steep 100

Sources: Ministerial Decree No.. 837/UM/II/1980 and No.683/KPTS/UM/1981

b) Rainfall Analysis

Analysis of the magnitude of rainfall intensity can be done based on the table

below; very steep

Table II.3

Analysis of Rainfall Village Ngadirgo, Wonolopo, and Wonoplumbon

No. Class Interval (mm/day) Description Score

1 I 0-13,6/<1500-2000 Very Low 10

2 II 13,6-20,7/2000-2500 Low 20

3 III 20,7-27,7/2500-3000 Medium 30

4 IV 27,7-34,8/3000-3500 High 40

5 V >34,8/>3500 Very High 50

Sources: Ministerial Decree No.. 837/UM/II/1980 and No.683/KPTS/UM/1981

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c) Soil Type Analysis

Lithological types of soil analysis can be done based on the table below;

Table II.4

Analysis of Slope Village Ngadirgo, Wonolopo, and Wonoplumbon

No Class Type Description Score

1 I lluvial, Gley soil, Planosol, Hidromorf Gray, Laterite Soil Water

Sensitive 15

2 II Latosol Less Sensitive 30

3 III Brown forest, Non Caltic Brown, Mediterania

Sensitive 45

4 IV Andesol, Latrik, Grumosol Sensitive 60

5 V Regosol, Litosol, Organol, Renzina

Very Sensitive 75

Sources: Ministerial Decree No.. 837/UM/II/1980 and No. 683/KPTS/UM/1981

Based on the results of the scoring are made it is known the result of the

carrying capacity of the land area of the Village Micro Ngadirgo, Wonolopo,

Wonoplumbon can be concluded that in urban areas Ngadirgo, Wonolopo and

Wonoplumbon functions can be grouped into two areas, namely the function of

cultivated area and the function of the buffer zone. In the cultivated area can be

utilized for residential areas, plantation, dry land. Whereas in the buffer zone can not

be used as a residential area in the buffer zone is the area between cultivated areas

and protected areas, and therefore in the buffer zone functioned for planting more

trees and can not didirakan homes in the region.

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Table II.5 SWOT Analysis Ngadirgo Village, Wonolopo, and Wonoplumbon

Slope

Category

Score Rainfall Score Soil Type Score Total Score Function Area Location

0-2% 20 27,7-34,8

mm3/hari 40 Latosol 30

90 Cultivation Ngadirgo Village

2-15% 40 110 Cultivation

15-25% 60 130 Buffer

2-15% 40 27,7-34,8

mm3/hari 40 Latosol 30

110 Cultivation Wonolopo Village

15-25% 60 130 Buffer

2-15% 40

27,7-34,8

mm3/hari 40 Latosol 30

110 Cultivation

Wonoplumbon

Village

15-25% 60 130 Buffer

25-40% 80 150 Buffer

>40% 100 170 Buffer

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d) Land Suitability Analysis

Based on the analysis of the spatial aspects of rainfall, soil type and slope in

the scoring analysis, and also based on the Spatial Plan, it will get the land

suitability analysis of the Village Ngadirgo, Wonolopo and Wonoplumbon form

of cultivated area and the buffer zone. Cultivated area in the Village Ngadirgo,

Wonolopo and Wonoplumbon a function of the area's most dominating. This

corresponds to a state of relatively flat terrain to sloping, ie sekitr 0-8% and 8-

15%. In accordance with the nature and characteristics of the slope ramps that

do not have the high ground motion, so its presence does not threaten

anything that was on it. While based on level terrain, cultivation area is also

caused due to the condition of the land in this district is latosols ground.

Latosols land is land which is very supportive for use in all aspects of life,

because soil formation latosols compact, unlike clay which would be unstable

because of the influence of hydrology and weather around it, making it very

dangerous to something that is on it. Latosols land is suitable for use as a

plantation, agriculture, permanent production forests and settlements.

As for the buffer zone is more prevalent in the village Wonoplumbon. This

happens because kelerangan in this village is relatively steep with reddish

brown landfills latosols nutrient rich, so that the region is more suitable to be

developed as a plantation forest and land management that does not require

so large. This buffer serves to awake tetapa characteristic protected areas.

In the existing circumstances, there are some areas that occurred over the

function. Buffer zone which should only be used as a forest with no human

intervention in the portion of a lot, but in the Village Wonoplumbon some

experience cutting teak forest area for conversion to plantation residents, such

as corn and peanuts. Another problem is also the settlements that should be in

the region but is cultivated in the buffer zone.

Direction of the new land use that can be compiled in this report include the

direction of agricultural land use, land-use residential referrals and referral

procedures for trafficking.

1. Referrals Land Use Settlements

Direction of new settlements on land use over and put on

Wonoplumbon Village in the Village Ngadirgo the number is not so

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great. Determination Wonoplumbon village settlements in the region

considering the physical aspect, such as aspects of environmental

geology, aspect and the aspect of the river where the road

infrastructure. Determination of the area of new residential land use in

the Village this Wonoplumbon sought to be placed in areas that are

relatively flat. It is characterized by the relative distance of the contour

lines away.

Selection of this flat area to avoid geologic hazards can occur at

any time. Areas with steep slopes, will likely cause problems later on.

One of the geological hazards are avoided is the danger of landslide

geological and soil movement. Selection of new settlements was also

noticed other geological aspects such as whether there is a major fault

line trajectory. Areas that are in the path of major faults can lead to

problems such as soil movement and landslide hazards. In addition, site

selection is also based on the location of the road. Position that

settlements are a bit away from arterial roads will provide comfort for

the occupants as it can avoid the noise. And in this location, type of

course is a collector street that day-to-day was not so crowded with

vehicular traffic. The next consideration is the location of the remote

location of the River Plumbon, this is done in order to minimize any

hazards such as erosion, landslides and overflowing rivers in the rainy

season. As for the residential land use in the Village Ngadirgo is one of

the new settlements that have been built by the developer Bukit

Semarang Baru. This settlement is located on the roadside despite

artery, but the street is not crowded so it does not cause noise on

residents in these settlements.

2. Referrals Agricultural Land Use

Direction of new agricultural land use is intended to increase the

utilization of river water flow is in the Village Wonolopo and

Wonoplumbon. Some land was vacant land or moor is located in the

Village Wonolopo be converted into agricultural areas irrigated with

river flow utilizing Plumbon. So it is with some forest and plantation

areas hard hit in the Village Wonoplumbon can be recovered into

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agricultural areas irrigated with river water flow utilizing Blorong are

quite heavy.

The presence of soil types latosols very suitable for use as

agricultural land if supplied with adequate irrigation water, the soil will

make it more productive. With the use of this, the level of the people's

economy is expected to be better with the new job as a farmer. For

agricultural land located in the Village Wonoplumbon swale system

because the slope is quite steep.

3. Referral Trade Land Use

The only trading center located in the Village Ngadirgo, Wonolopo

and Wonoplumbon is Mijen market. Due to the increasing number of

people who reside in these three villages, it is necessary to build new

trade centers that are accessible to all residents, both derived from the

Village Ngadirgo, Wonolopo and Wonoplumbon. New trade center is

placed in the middle area of the Village Ngadirgo, Wonolopo and

Wonoplumbon. Construction of trade center is a follow-up of the

construction of new settlements in the Village Wonoplumbon. This is

because the distance between the village Wonoplumbon Mijen market

is quite far away. So with the new trade center, day-to-day needs of

residents in the surrounding village Ngadirgo, and in particular the

Village Wonoplumbon Wonolopo can be more easily met.

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BAB III

CONCLUSION

Based on the results of the discussion and analysis of the data obtained in the field, it

can be concluded as follows:

Ngadirgo Village, Wonolopo Village, and Wonoplumbon Village has an area about 19.02

km2 with rainfall levels from 27.7 to 34.8 mm / year. Most of the geological conditions is

dominated by sandstone and breccia from the formation of resin and kaligetas formation. Area

of the research is an area of the fractures structure and fault, landforms largely a hilly area.

Land use in the study area is dominated by plantations and forests. The type of soil that can be

found is the reddish brown latosol with sandstone and breccia as its constituent. Area of the

study is an area of the aquifer with moderate productivity and drained two rivers, Plumbon

River and Blorong River.

Based on the geological aspects of the physical state in the Village Ngadirgo,

Wonolopo and Wonoplumbon, it can be automatically conclude the potential and constraints

that are contained in the three villages. Geological potential in Ngadirgo village, Wonolopo and

Wonoplumbon is latosol soils that have a high nutrient, found in two watersheds that have

high water discharge and groundwater conditions with moderate productivity. While the

constraints contained in Ngadirgo village, Wonolopo and Wonoplumbon is the ground

movement ranging from low-to middle-ground movement which at times can lead to the

occurrence of landslides.

Related to geological aspects as well as potential and constraints in Ngadirgo Village,

Wonolopo and Wonoplumbon with urban and regional planning, then it will get an suitability

output of land where the village Ngadirgo, Wonolopo and Wonoplumbon have suitability of

land as a cultivated area and the buffer zone. At existing circumstances, cultivation area in

Ngadirgo, Wonolopo and Wonoplumbon widely used by residents as residential areas, farms,

plantations and fields. As for the buffer zones were encountered at Blorong River flow area

used as a non-production forest and production forest.

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