Watershed Characterization And Management Planning In Wular Catchment.doc

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WATERSHED CHARACTERIZATION AND MANAGEMENT PLANNING IN WULAR CATCHMENT

Writekraft Research & Publications LLP (Regd. No. AAI-1261) Corporate Office: 67, UGF, Ganges Nagar (SRGP), 365 Hairis Ganj, Tatmill Chauraha, Kanpur, 208004 Phone: 0512-2328181 Mobile: 7753818181, 9838033084 Email: [email protected] Web: www.writekraft.com

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CHAPTER - 1 INTRODUCTION

Writekraft Research & Publications LLP (Regd. No. AAI-1261) Corporate Office: 67, UGF, Ganges Nagar (SRGP), 365 Hairis Ganj, Tatmill Chauraha, Kanpur, 208004 Phone: 0512-2328181 Mobile: 7753818181, 9838033084 Email: [email protected] Web: www.writekraft.com

Writekraft Research & Publications LLP (All Rights Reserved) Chapter – 1

Introduction

History of human impact on environment is as old as human existence. Contrary to this the human conscience about the accelerating negative impact on natural environment arose only after the threshold of development reached and the deteriorating environment started to roll back on human existence. The evolution of man to a sophisticated designer utilizing his intellect to transform the natural endowments to continuously cherish his desire of comfort and prosperity has been beautifully summed up in the first proclamation in chapter 1 of Stockholm Conference, 1972 “Man is both creature and moulder of his environment, which gives him physical sustenance and affords him the opportunity for intellectual, moral, social and spiritual growth. In the long and tortuous evolution of the human race on this planet a stage has been reached when, through the rapid acceleration of science and technology, man has acquired the power to transform his environment in countless ways and on an unprecedented scale---” Subsequently, the population-environment relationship was debated by many scholars. Significant among them was Ehrlich and Holdren, 1974 who propounded that the human impact (I) on the environment is Writekraft Research & Publications LLP (Regd. No. AAI-1261) Corporate Office: 67, UGF, Ganges Nagar (SRGP), 365 Hairis Ganj, Tatmill Chauraha, Kanpur, 208004 Phone: 0512-2328181 Mobile: 7753818181, 9838033084 Email: [email protected] Web: www.writekraft.com

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the product of population (P), resource consumption (A) and technology (T) and emphasized that population size and growth as the most urgent IPAT factor, whereas Commoner, 1972 argued that production technologies were the

dominant reason for environmental degradation. The United Nations Conference on Environment and Development held in Rio de Janeiro, Brazil, in 1992 was a milestone in the evolution of an international

consensus

on

the

relationships

among

population,

development and environment, based on the concept of sustainable development articulated by the WCED, 1987.

Writekraft Research & Publications LLP (Regd. No. AAI-1261) Corporate Office: 67, UGF, Ganges Nagar (SRGP), 365 Hairis Ganj, Tatmill Chauraha, Kanpur, 208004 Phone: 0512-2328181 Mobile: 7753818181, 9838033084 Email: [email protected] Web: www.writekraft.com

Chapter – 1

Introduction

The World Commission on Environment and Development defined sustainable development as that which meets the needs of the present without compromising the ability of future generations to meet their own needs. Sustainability refers to the qualitative and quantitative continuity in the use of a resource. It attempts to balance the often-conflicting ideals of economic growth and maintaining environmental quality and viability (Skidmore et al., 1997). Sustainable development is defined by the United Nations Department of Economic and Social Affairs as having three pillars: social, economic, and environmental. The social pillar refers to meeting the basic needs of society, such as health and education, and protecting human rights. The economic component refers to efficiently managing the economy to meet material needs. The environmental component is concerned with the conservation and enhancement of the physical and biological resource base and ecosystems.

1.1. Watershed as a Geographical Unit of Study A watershed represents a topographically defined area that is drained by a stream system, representing a smaller upstream catchment, which is a constituent of a larger river basin. This landscape encompasses both surface and groundwater supplies, in addition to related terrestrial and community resources. The watershed is being viewed as a place based and ecological entity, as well as a socioeconomic and political unit to be utilized for management

planning,

conservation

strategies

and

implementation purposes. Watershed is thus a development unit in which all the natural resources like soil, water, geomorphology and land use are in harmony there

by facilitating adoption of holistic approach to problem solving. Watershed is considered to be the ideal unit for analysis and management of natural resources for planning (Akhouri, 1996). The soil, vegetation and water are the basic resources, which interact and establish in a watershed. Hence, all these three resources have to be managed collectively and in an integrated way. The Physiography of the land, slope and nature of soil cover, land use • cover, hydro geomorphology, climate, socio-economic and legal aspects etc. and the hydrological features of the land area determine the productive interaction between these natural resources. Watersheds can also be repositories of global environmental benefits, such as biodiversity and carbon sequestration. Moreover, upper watersheds

2

Chapter – 1

Introduction

are linked, through water flows to downstream land and coastal areas far from the steep terrains where water flows are generated. A watershed represents a unique geo-physical unit within which water moves continuously in a cycle that begins with precipitation. Land use activities that affect climate, landform, soil or vegetation also impact the natural distribution of water within the watershed landscape. Activities, such as urbanization and agricultural practices, can alter the slope of land and channel form; pave over or compact soils; remove vegetation; and have many other effects. These effects all result in changes in the water balance. That is, they can change the proportion of rainwater that flows overland relative to that stored, evaporated, infiltrated or taken up by plants and transpired.

1.2. Watershed Degradation Descriptors The degradation of land and water resources due to the complex interactions within a watershed can have far-reaching and unwanted impacts on the environment beyond the impacts on soil and water resources and the related economic activities. These impacts on the broader environment may include climate change, global warming, loss of biodiversity, impaired energy cycles, food crisis etc and may also have a direct or indirect cost for different sectors of the economy, including tourism and services generated by biodiversity. The exponential increase in population has fueled a significant demographic shift. In 1950, only 30% of the world’s population was found in urban areas; however, the projected five billion urban dwellers will represent 60% of the world’s population by 2030 (United Nations, 2002). The term “urbanization” describes an increase in human habitation linked with increased per capita energy and resource consumption and extensive landscape modification (McDonnell and Pickett, 1990). Urbanizing regions pose increasing challenges to ecosystems health and functioning. Urbanization affects the structure and function of Earth’s ecosystems through the transformation of the natural landscape, alteration of biophysical processes and habitat, and modification of major biogeochemical cycles. These changes in turn affect the ecosystem’s capacity to deliver important services to the human population and support human well-being (Alberti, 2010).

3

Chapter – 1

Introduction

Land cover changes are the result of interactions between biophysical and socioeconomic processes and factors (Turner et al., 1989). Agriculture can have a detrimental effect on water quality leading to acute problems such as erosion, Salinization, diffuse pollution by nutrients and pesticides (Zalidis et al., 2002). Empirical studies have shown the dominant influence of land cover (e.g. forest, agriculture, urban) in determining the amount of nitrogen (N) and phosphorus (P) in rivers, lakes, and estuaries (Hunsaker, 1992).

Soil erosion by water is the most significant land degradation problem worldwide (Eswaran et al., 2001; Deng et al., 2009). Soil erosion creates strong environmental impacts and high economic costs through its effect on agricultural production, infrastructure and water quality (Pimentel et al., 1995; Lal, 1998), directly affecting human quality of life and threatening human safety. Soil conservation actions should therefore serve to improve the ecological and socio-economic environment. Water quality is one of the fundamental components of a healthy watershed because it integrates important geomorphic, hydrologic and some of the biological processes of a watershed. Alteration of any one of these processes will affect one or more water quality parameters. Hence changes in water quality indicate a change in some aspect of the terrestrial, riparian or in-channel ecosystem. Generally, the concentration or load of nitrogen and phosphorus in receiving waters increases as the amount of agriculture or urban land increases in a watershed (Parry, 1998).

1.3. Watershed Management Watershed management is the integrated use of land, vegetation and water in a geographically discrete drainage area for the benefit of its residents, with the objective of protecting or conserving the hydrologic services that the watershed provides and of reducing

or

avoiding

negative

downstream

or

groundwater

impacts.

The

key

characteristics of a watershed that drive management approaches are the integration of land and water resources, the causal link between upstream land and water use and downstream impacts and externalities, the typical nexus in upland areas of developing countries between resource depletion and poverty, and the multiplicity of stakeholders. Watershed management approaches need to be adapted to the local

4

Chapter – 1

Introduction

situation and to changes in natural resource use and climate. Watershed management interventions may bring local, regional and global environmental benefits. An integrated approach to natural resource management at the watershed level would ideally address the complex system dynamics in watersheds and would achieve global environmental benefits. The first generation of watershed management projects in developing countries in the 1970’s and 1980’s applied a soil and water planning approach to watersheds that emphasized engineering works aimed at specific on-site and downstream physical outcomes. By the end of the 1980’s, the comparative failure of this “engineering-led” approach was clear, and a major rethinking of watershed management approaches was undertaken by national and international agencies. The 1990s represented a new departure for watershed management programs supported by the international community in developing countries. Although engineering solutions were not excluded where appropriate, the emphasis was placed more on farming systems and on participatory and demand-driven approaches. National policies on watershed management have tended to develop in a pragmatic and iterative fashion, with early setbacks over engineeringdominated approaches being succeeded by tests of community-based approaches and by technology packages targeting sustainable changes in land and water use practices that brought profit to stakeholders.

Judicious management of land and water resources requires in-depth knowledge of the dynamic behavior of the watershed. Water is the best index of watershed management and thus provides an excellent monitoring mechanism. Watershed management is not so much about managing natural resources, but about managing human activity as it affects these resources. The drainage area of the river provides the natural boundary for managing and mitigating human and environmental interactions. The watershed management process can be seen as a continuum that includes producing a plan, implementing it, monitoring its effectiveness, and evaluating and updating it. Despite the difficulties, the process is valuable because it promotes a systematic and logical way of thinking and a framework for making decisions with regard to water and land use. Land use planning and management at the watershed level is a multi-objective resource management problem because it deals with human activities within the watershed that are motivated by multiple and

5

Chapter – 1

Introduction

often conflicting objectives and constraints, such as farm income enhancement, soil and water resource protection, urban development and drinking water supply (Prato et al., 1995). In recent years, there has been a growing consensus that an effective way to control sediment deposition, non-point source pollution and enhance the long-term sustainability of agriculture and rural communities can be achieved through integrated planning and management. Watershed management programs may, for example, include conservation of existing natural areas, regeneration of native vegetation and replanting indigenous species;

creating

ecological

corridors

for

wildlife;

establishing

buffers

for

biodiversity; or choosing trees with a good carbon sequestration potential. These programs may bring local, regional and global benefits. However, there may be tradeoffs. For example, planting trees may be a global good, but trees may change the local water balance. An integrated approach to natural resource management at the watershed level would ideally address the complex system dynamics in watersheds and achieve global environmental benefits where feasible. IWM planning is a comprehensive

multi-resource

management

planning

process,

involving

all

stakeholders within the watershed, who together as a group, cooperatively work towards identifying the resource issues and concerns of the watershed, as well as develop and implement watershed plan with solutions that are environmentally, socially and economically sustainable. The relationship between society and ecosystems should be harmonized at the watershed scale, and the ecosystem and society should be treated as integrated systems. To determine the ongoing human–nature interactions in order to develop policy for regional sustainable development, an interdisciplinary approach and system theory should be used (Boulanger and Brechet, 2005). It is necessary for scientists to employ sound ecological principles and provide interdisciplinary ideas for decision makers (Naiman et al., 1998). The systems approach in spatio-temporal nature of geography has allowed the use of most advanced technologies to usher a methodological revolution particularly in context of sustainable development paradigm. The ability to study the complex spatial and temporal interrelations of various phenomena in digital format on a

6

Chapter – 1

Introduction

computer through the advanced satellite technology has helped tremendously in adopting a watershed approach in environmental management. Remote sensing has become an indispensable scientific tool for mapping and monitoring of natural resources. The advent of computer and spatial data in digital form has powered the development of geographic information systems (GIS) and the proliferation of digital elevation models (DEMs) and digital maps of soils, vegetation, rivers, roads, as well as other information for much of the developed world and of land cover with a variety of remote sensing devices that operate across the electromagnetic spectrum (Jensen, 2000) has become standard. The integration of information derived from remotely sensed data into GIS and their analysis can be considered as the primary tool for efficient acquisition of input parameters needed for distributed hydrological modelling (Meijerink et al., 1994). Hydrological Modeling has revolutionized methodology in mapping the environmental complexity and determining the factors and enormity of environmental degradation. The integration of Remote Sensing, GIS and Modeling has led to the continuous monitoring of earth and its processes.

1.4. Significance of the Study People rarely intend to create environmental problems. The result was the sum of a myriad of seemingly miniscule individual actions... [but] motive is irrelevant to environmental impacts (Schneider, 1996). The anthropogenic modification of the hydrological cycle by deforestation, urbanization and irrigation has led to degradation, over exploitation, and wastage of water resources resulting in higher risks to human health, economic and social development as well as to the functioning of ecosystems and the preservation of the environment. The deterioration and dwindling of lake ecosystems has been increasing at an alarming rate, due to various ecological stresses caused largely by the activities of man. The rapid development within watersheds due to anthropogenic activities has had negative ecological consequences on ecosystem structures, processes, and functions. For lake aquatic ecosystems, human activities in the watershed can lead to loss of important species and functional groups, high nutrient turnover, low resistance, high porosity of nutrients and sediments and the loss of productivity. Thus, it is necessary to restore aquatic ecosystems based on the

7

Chapter – 1

Introduction

understanding of the link between watershed changes and the corresponding effects on the aquatic ecosystem. Watershed is a bio-geo-physical unit in which, interdependence of renewable and non-renewable resources from environment are closeted. A watershed is used as a unit for planning and management of land, water and other resources, and the inter-related factors such as physical, biological, technological, socio-economic, cultural etc. are considered collectively in a system framework. Scientific management of soil, water and vegetation on watershed basis is, therefore, very important to arrest rapid siltation in rivers, lakes and estuaries. Integrated watershed management has been accepted as the most rational approach in preventing deterioration of ecosystem, restoration of degraded lands and improving the overall productivity for sustained use.

The goal of sustainable management is to maintain the ecological functions of landscapes under increasing human aspirations and pressures. Increasing population pressure has resulted in a considerable degree of land transformation and environmental deterioration leading to a decline in the availability of land. In order to optimize the use of available land and to meet the multiple demands of food, fodder, fuel wood etc, a proper planning and management of land and water resources is a basic prerequisite, which is possible through watershed-based programmes.

Wular

Catchment

is

facing

severe

stress

of

increasing

population followed by unplanned utilization and management of natural resources. Proper planning and utilization of the run-off water is essential for its effective management and sustainable development. The Wular Lake is important both from ecological and economic point of view. Wular Lake has become polluted and is shrinking in size due to siltation, caused by sediment yield transported by different rivers into the lake. Its sustainable development and management can help to restore it as the largest fresh water resource in the region and a vast reserve of biodiversity. Population pressure within the Wular Catchment has led to conflicting interests leading to land degradation hence sediment and nutrient loading into the aquatic systems in the catchment, mainly from non-point source pollution. The sediments from the catchment are conveyed to the lake via the rivers and streams,

8

Chapter – 1

Introduction

while the atmospheric pollutants are adsorbed and deposited on the lake surface in dry form (gases and particles) and in wet form carried by rain. Activities causing diffuse pollution include: high population growth, unplanned human settlement, deforestation, intensive farming, livestock keeping, wetlands encroachment, urban agriculture, quarrying and infrastructure. A comprehensive evaluation and integrated water resources management is presented for Wular Catchment using remote sensing and GIS techniques with a view to develop natural resources on sustainable basis.

1.5. Objectives /

To characterize the watersheds on the basis of the Geophysical, Socioeconomic and Land use/ Land cover dynamics in Wular Catchment.

/

To study the Physico – chemical characteristics of water in Wular Lake.

/

To estimate the Potential Soil Loss in Wular Catchment at watershed level.

/

To prepare a Potential Groundwater Infiltration Zonation map in the Wular Catchment.

/

To develop an Integrated Watershed Prioritization Index to accentuate the watershed management in Wular Catchment.

9

Chapter – 1

Introduction

1.6. Literature Review The watershed characterization and management planning is a multidisciplinary study involving parameterization of varied components of a watershed to assess their complex interaction and impact of extrinsic factors of which human impact is an indispensable factor. Thus the literature has been reviewed and arranged according to the different parameters studied and integrated for watershed management planning. Singh and Sarangi, 2008 studied the hypsometry of two drainage basins, viz, Sainj and Tirthan with their sub basins in the Kullu district of Himachal Pradesh and concluded that the Sainj watershed and ten of its sub basins are more prone to erosion in comparison to Tirthan and its five sub basins. Singh, Sarangi, and Sharma, 2008 validated their earlier results with recorded sediment yield data of 24 years (1981– 2004) corroborated that the average annual sediment yield during this period for Sainj watershed (0.53 Mt) was more than that of the Tirthan watershed (0.3 Mt) suggested watershed prioritization to conserve soil and water systems. Singh, 2008, studied the hypsometry of actively deforming Mohand anticline ridge in the frontal part of NW Himalaya. Sivakumar, Biju, and Deshmukh, 2011 while analyzing the hypsometry of Varattaru river basin, both suggested suitable locations for controlling further erosion, reducing the runoff and increases the groundwater. Sorensen, Zinko, and Seibert, 2005 obtained the topographic wetness index (TWI), by varying indices to quantify topographic control on hydrological processes for two separate boreal forest sites in northern Sweden. Grabs, Seibert, Bishop and Laudon, 2009 using simulation modeling of distributed catchments; predicted the spatial distribution of wetlands significantly better than the TWI. Ruhoff, Castro and Risso, 2011 by using distribution functions and their statistics and cell by cell comparison of DEMs showed significant differences between different flow-direction algorithms. Lanni, McDonnell and Rigon, 2011 developed new dynamic topographic index based on Boussine sq equation (BEq) solver to show correlations of TWI and the patterns of soil water storage around the world; found it more accurate than the previous one and able to capture both the upslope and down slope controls on water flow and approximates storage dynamics across scales.

10

Chapter – 1

Introduction

The works of Mather and Doornkamp, 1970, Gregory, 1978, and Gardiner, 1978 in terrain characterization studies, especially on spatial variability of morphometric parameters, are considered immensely important. Morphometric analysis was also employed for characterizing watersheds (Nag, 1998; Vittala, Govindaiah and Gowda, 2004; Vijith and Satheesh, 2006; Rudraiah, Govindaiah, and Vittala, 2008; Al Saud, 2009; Rao, Latha, Kumar and Krishna, 2010; Bagyaraj and Gurugnanam, 2011; Arpita and Kumar, 2009; Magesh and Chandrasekar, 2010), for the prioritization of watersheds (Nooka Ratnam et al., 2005; Thakkar and Dhiman, 2007; Mishra and Nagarajan 2010; Londhe, Nathawat and Subudhi, 2010; Kanth and Hassan, 2012), for formulation of Watershed Management Plans (Pakhmode, Kulkarni and Deolankar, 2003; Javed et al., 2009; Thomas, Joseph and Thrivikramaji, 2010), for flood assessment and vulnerability (Ozdemir and Bird, 2009). Li, Peterson, Liu and Qian, 2001; Helmschrot and Flugel, 2002; Xiuwan, 2002; Vasconcelos, Mussa, Araujo and Diniz, 2002; Nash et al., 2003; Zeng, Sui and Ben, 2005; Mengistu and Salami, 2007, Fan, Weng and Wang, 2007 and Kanth and Hassan, 2010 have used GIS and remote sensing techniques to assess the changing land use/land cover. Karia, Porwal, Roy and Sandhya, 2001; Rao and Pant, 2001 have adopted remote sensing and GIS techniques in change detection analysis and resource appraisal. Similar works have been done by Singh and Mahavir, 2003; Singh et al., 2005; Mahajan and Panwar, 2005; Shetty, Nandagiri, Thokchom and Rajesh, 2005; Solanke et al., 2005; Chakraborty, Dutta and Chandrasekharan 2001; Joshi, Rawat, Padaliya and Roy, 2005; Chauhan and Nayak, 2005; Narumalani, Mishra and Rothwell, 2004 and Choudhary, Saroha and Yadav, 2008.

The increased concentration of phosphate in water bodies is mainly caused by addition of phosphorus rich sewage (Edmondson, 1970). While working on the temperature, oxygen and nutrient distribution pattern in Lake Erie, Burns, 1976, pointed out that nitrate and nitrite levels decrease during summer, while ammonia level remained constant during the this period. The Universal Soil Loss Equation (USLE) is the best known and most widely used soil erosion model. The USLE has been used for natural resource management planning. Zhang et al., 2010 in their work identified the soil conservation priority

11

Chapter – 1

Introduction

regions based on the soil erosion risk assessment. The USLE has been used in simulations on basins with varying drainage area (Fistikoglu and Harmancioglu, 2002; Onyando, Kisoyan and Chemelil, 2005; Erdogan, Erpul and Bayramin, 2007; Dabral, Baithuri and Pandey, 2008), so that researchers can compare simulated soil loss with acceptable values for the same kinds of soil. In Kashmir Valley USLE has been used by Kanth and Bhat, 1991, who found that nearly one third of the Kashmir Valley is under the threat of moderate to severe erosion problem; Soil erosion intensity zones were delineated for Liddar basin by Ahmad and Kanth, 2007; Sheikh, Palria, and Alam, 2011 integrated USLE and GIS for a micro watershed of Liddar Catchment integrating USLE with RS and GIS. They found that average soil loss was highest (26 t ha

-1

-1

year ) in agriculture area and lowest

soil loss rate was found in forest area (0.99 t ha

-1

-1

year ).

Randhir, Connor, Penner and Goodwin, 2001 have developed a watershed level prioritization model for a wide variety of land protection and land use decisions. Gergel et al., 2002 emphasized on ecological concepts by viewing the multiple potential roles of landscape and reviewing historical role of ecology in planning Leitao and Adhern, 2002 and Said et al., 2006 were also of the same opinion. Wicham and Wade, 2002 found land cover composition a principal factor in controlling the amount of nitrogen and phosphorus in watersheds Ahn, Mizugaki, Nakamura and Nakamura, 2006 found deforestation, channelization, road construction as well as agricultural development responsible for increased sedimentation. Bouraoui, Benabdullah, Jrad and Bidoglio, 2005 studying the potential impact of land management scenarios applied the SWAT (Soil and Water Assessment Tool) model find out irrigated crop introduced significant changes on nitrate concentration in surface water. Wolsink, 2006 describes the shift in the water management policy from mere technocratic methods to integrated water management emphasizing on the local aspirations in spatial planning and land use decisions. Kanth and Hassan, 2010 carried out watershed prioritization for natural resource management by integrating land use/land cover, drainage morphometry and socio economic parameters in the Wular Catchment. ha, Madan and Chawdary, 2007 Teixeira et al., 2008 gave the management plans for groundwater sustainability using RS and GIS, while as Raghu and Reddy,

12

Chapter – 1

Introduction

2011 and Saxena and Prasad, 2008, revealed site specific recommendation on ground water prospects to develop irrigation facilities in the area, Babu, Prasad and Rajeev, 1999 have suggested a Catchment Treatment Plan in Neyyar wild life sanctuary, Kerala employing a multi-thematic analysis based on different parameters of slope, land use/land cover, drainage, relative relief and soil using Remote Sensing and GIS.

13

CONCLUSION AND SUGGESTIONS

Chapter – 8

Conclusion and Suggestions

8.1. Conclusion The Wular Catchment is a complex geophysical unit with highly differentiated topography and a thorough highland-lowland interaction. The geophysical characterization clearly depicted the dominant control of landscape elements like altitude, slope, aspect on the location and magnitude of the degradational processes of the Wular Catchment. The altitude varies from about 1600 meters near Wular Lake to about 5000 meters near Harmukh range. The mountainous landscape (>2000 meters) covers 50% while as the low lying flood plains and foothills constitute 50% of the Wular Catchment. The slope also varies o

greatly in the Wular Catchment with the gentle slope (<5 ) constituting 31%, the moderate and moderately steep (21.30%) and steep to escarpments cover 47.7%. While as significant negative growth has occurred in dense forest (-25.08%), water body (-23.92%) and wetland (-23.87%). The significant increase in built-up, agricultural land and wasteland and the decrease in wetlands and forests indicate severe deterioration in environmental conditions. hese changes transformed the natural landscape into human-dominated landscape characterized by increased built up, deforestation, steep-slope farming etc and establishment of developmental projects like Kishenganga hydroelectric project.

The positive changes in vegetation have mostly occurred in the 2

2

Wular Periphery (+39.15 km ), Wular Lake (+42.4 km ), 1EM2a (+18.45 2

2

km ) and 1EW2b (+12.75 km ). The biomass increase is also explained by the change in the land use from paddy land to the horticulture and the conversion of forests to the grasslands and wastelands. The Socio-economic condition of a region is of vital significance in balancing the increasing human needs and environmental degradation. The population growth in the Wular Catchment is high and has shown a fourfold increase from 1961 (93486) to 2011 (389741) registering a growth of +316.9%. The watersheds which have high physiological density in 2011 are 1EM2c (14449.06) and 1EE2c (3051.43). The density and distribution of population in the Wular Catchment is greatly controlled by resource potentiality and economic growth. The majority of people in the Wular Catchment is of productive age group (57.4%) employed mostly in the primary sector

119

Chapter – 8

Conclusion and Suggestions

(57.5%) leading to the problem of resource degradation. The workers are mostly engaged in farm sector and its allied activities which provide limited employment opportunities. The potential work force is 57.76% in the Wular Catchment while as the actual workers constitute only 28.4% of the total population. This clearly shows a low work participation and high unemployment. The daily consumption of fuel wood in the Wular Catchment is 4886 quintals which is quite high indicating the high dependence on forests and less use of alternate sources of energy like kerosene oil, biogas, solar energy, LPG etc The Universal Soil Loss Equation (USLE) (Wischmeier and Smith, 1978) has been used with combination of remote sensing and GIS technique to calculate soil loss for mapping and assessment of erosion risk for natural resources management planning, allowing to modify land-use properly and implement management strategies more sustainably in the long-term. The Wular Catchment constitutes 10.95% under very high soil loss zone, while as the watersheds having highest proportion under this category are 1EM2b (25.78%), 1EE2a (25.10%) and 1EM1a (23.26%). The high values of soil loss are the result of the combination of steep slopes with high LS factor, sparse vegetation and barren surfaces due to human activities, such as forest clearance for the habitation. This region is also characterized by high rainfall erosivity, low soil erodibility and absence of the erosion control practice. The high, moderate and slight soil loss covers 23.13%, 20.16% and 38.92% of the Wular Catchment respectively. The advantage of the GIS-USLE approach is its ability to predict soil loss over large areas due to the interpolation capabilities. It was therefore possible to circumvent the constraint of limited field data on soil loss factor controls at meso- and macro-scale, by capturing and overlaying the USLE parameters in a GIS.

The very high potential groundwater infiltration zone in Wular Catchment is characterized by suitable surface and subsurface conditions like occurrence of lineaments, permeable rock masses, good vegetation cover, low drainage density and high rainfall. This zone with the highest potential of aquifer recharge covers an area of 74.94 (6.24%). The watersheds constituting the highest proportion in the very high infiltration zone are 1EW2b, 1EOb2 and 1EOa1 respectively. 1EOb2 is mostly covered by sandstone and limestone with loamy surface.1EOb1 has a high lineament

120

Chapter – 8

Conclusion and Suggestions

density. Both the watersheds have a considerable area under piedmont zone with low drainage density. 1EOb2 is mostly covered by gentle slopes while as 1EOa1 has also a significant area under gentle to moderately steep slopes. The Wular Catchment has an 2

area of 275.54 km under the high zone of aquifer recharge constituting 22.95% of the total area. The highest proportion of area under this zone is in 1EE1a (46.30%), 1EOb2 (42.64%), 1EOb1 (36.78%) and 1EOa2 (28.70%) respectively.

These characteristics are mostly attributed to the presence of urban centre of Bandipora in this watershed. Moreover, this watershed has more than 26% of area under very high and severe soil loss zone and 63% of area has lower potential for groundwater infiltration. These watersheds have high susceptibility to degradation and thus have attained the highest priority for application of management strategies for land and water conservation.

8.2. Suggestions The present study has employed integrated approach to identify and assess the critical areas on the watershed level which need immediate attention to arrest the unsuitable processes which are responsible for rampant degradation of the Wular Catchment. The study has helped in devising the following strategies for controlling the spiraling degradation processes of the Wular Catchment. •

The differential population density and distribution has put the available resource base and the general environment of Wular Catchment under tremendous stress. Thus there is an urgent need to arrest the fast growth of human population as the achievements of planning are neutralized by the large addition of population every year. The population pressure on agricultural land in the Wular Catchment is intense not only in densely populated areas, where arithmetic population densities are higher but equally intense on sparsely populated areas because of the limitations imposed by the environment on cultivation. Therefore, the sparsely populated areas need not to be overlooked in the developmental efforts simply because of their population size, but deserve greater attention due to their inaccessibility and backwardness.

•

Diversification of economy will enable people to move from primary to secondary or tertiary sectors and consequently will reduce the burden from

121

Chapter – 8

Conclusion and Suggestions

lumbering, fishing and subsistence agriculture. Productivity enhancement and livelihoods shall be given priority along with conservation measures. Resource development and usage should be planned in such a way to provide local

/

Human resource development in rural areas and increased nonfarm employment opportunities will reduce pressure on land.

/

Non – conventional sources of energy like solar lights, biogas should be provided to the inhabitants to reduce the burden on forests. Furthermore, easy accessibility and availability of L.P.G should be ensured to cater the increasing energy demands of the area.

/

The participation of local communities is crucial in planning and management of Wular Catchment on long term basis. Ensuring participation of all stakeholders requires understanding of their needs and sharing of authority and responsibility for resource management.

/

Capacity Building and training of all functionaries and stakeholders involved in the watershed programme implementation should be carried out with definite action plan and requisite professionalism and competence.

/

Development of ecotourism in the Wular Catchment will help in improving the environment and providing economic benefits to the local communities.

← One of the major problems in Wular Catchment is the conversion of dense forests into the sparse forests. The main reasons for this change are deforestation for timber smuggling and fuel wood extraction; fragmentation of forest

area

for

developmental

works. Afforestation

and

reforestation

programmes should be launched in the affected areas. Furthermore, stringent measures should be devised to stop illegal timber extraction and associated activities. Reducing pressure on forests through provision of alternate sources of energy is also a viable option.

(PPP)

Improvement of water quality will restore the aesthetic value

of the Wular Lake and will render it fit for drinking purposes. Furthermore, the dependence on Wular Lake for various economic activities makes water quality enhancement more important.

122

Chapter – 8

•

Conclusion and Suggestions

The treatment of water for sewage from adjoining settlements by establishment of STP’s at critical points is extremely important to regulate the water quality of the Wular Lake.

•

The water quality improvement for the specific agro-eco-regions in the watersheds may be enhanced by targeting Best Management Practices (BMPs) in the areas that generate the most pollution.

•

The selective removal of the weeds and flushing of the lake will help in reducing the biomass in the Wular Lake.

•

Public awareness campaigns for water quality management and sustainability issues should be organized in the study area.

Agronomic practices for soil and water conservation help to intercept rain drops and reduce the splash effect, help to obtain a better intake of water rate by the soil by improving the content of organic matter and soil structure, help to retard and reduce the overland runoff through the use of contour cultivation, mulches and mixed-cropping.

•

A simple practice of farming across the slope, keeping the same level as far as possible and is called as contour farming.

•

Surface mulches are used to prevent soil from blowing and being washed away, to reduce evaporation, increase infiltration and to improve soil

•

It provides a continuous cover of the land. It provides protection against soil erosion and assures more than one crops to the farmer.

•

: This includes the addition of organic manures to the soil by legume interplanting (crop and grazing land; induced fertility), green manure (cropland), applying manure / compost / residues (organic fertilizers).

Engineering Measures: The engineering measures play a very vital role in controlling erosion on agricultural land. They are adopted to supplement the agronomical practices when the latter alone are not adequately effective.

/

Terraces are earth embankments constructed across the slope to intercept surface runoff and convey it to a stable outlet at a nonerosive velocity, and to shorten the slope length.

/

The eroding and the deepening of gully beds can be prevented with gully plugs. Gully plugs protect the gully beds by reducing the speed of runoff

123

Chapter – 8

Conclusion and Suggestions

water, redistributing it, increasing its percolation, encouraging silting and improving the soil moisture regime for establishing a plant cover. •

Small dams made from locally available materials such as earth, wooden planks, brush woods or loose rock, are built across gullies to trap sediments and thereby reduce channel depth and slope and are used in association with agronomic treatment of surrounding land where grasses, trees and shrubs are

planted. •

This includes identification, protection and enhancement of significant natural features including, headwaters, groundwater recharge and discharge areas, wetlands, vegetated stream buffers and forest areas, while considering historical and current human activities impacting the system.

•

The government should expand its interests in watershed management beyond flood and erosion control operations to achieve maintenance and enhancement of ground and surface water (both quality and quantity) for all users.

•

Water harvesting is another potential method for augmentation of ground water resources. The various structures and the criteria for the selection of their locations are given below: weathered zone / loose material / fractures.

In areas where transmissivity of the upper strata is poor, for example in shale underlain by sandstones. Around the habitations where drainage does not exist, for example water divide areas, hill/plateau tops, etc. •

groundwater prospects map on the watershed basis should be put to use as a suitable data base for developing a ground water based drinking water security plan for a habitation or for a group of habitations.

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