Environmental & Social Management Framework - About ...

More documents

Recommendations

Info

Environmental and Social Management FrameworkAll areas susceptible to erosion, such as cut and fill areas, shall be protected byeither temporary or permanent drainage works. Measures should be taken toprevent ponding of surface water and scouring of slopes. Newly eroded channelsshould be backfilled and restored to natural contours. Where crossing unstableterrain is unavoidable, minimize the road width for the section affected to reducedisruption to the slope. Pay special attention to drainage and leave a temporaryroad surface until a stable condition is achieved.e. Avoiding Hazards due to Unsafe Spoil DisposalConstruction work implies that extensive excavations will be carried out toprepare for the RoW. Spoil should be well managed with appropriate terracing atappropriate locations. Spoil should be managed adopting the following principlesand methodologies:• Preventive Measures:Careful selection of the road centre line by adjustment up or down the slopeshould aim to achieve balance between cut and fill within a reasonable haulagelength. Alignments on ridges are considered to be best alignment avoidingexcessive excavation. Other suitable options include to balance cut and fill forminimizing spoil generation, and to use phased construction techniques.• Mitigative Measures:- Wherever possible, use surplus spoil to fill eroded gullies and depressedareas.- If feasible, spoil material may be disposed in abandoned quarries andborrow pits as means to help restore original contours.- It is advised to use the excavated materials for reclaiming the degradedland in near vicinity in consultation with local communities on theirpreferences.- Never dispose spoil on fragile slopes, flood ways, wetland, farmland,forest areas, natural drainage path, religious and culturally sensitive sites,wetlands, canals and other infrastructures.- Acidic and saline spoil shall not be spread onto agriculture land.- Never dispose spoils on areas that will create inconvenience to the localcommunity or it will deprive the livelihood of people.- Spoil material may be discharged to a landfill that is constructed using aseries of small spoil benches to prevent slope overloading;- During disposal, place the spoil in layers of about 15 cm and compacteach layer at optimum moisture content,- After the disposal, the site should be landscaped, provided with properdrainage, plant with vegetation, and provide adequate protection againsterosion and scouring.- Spoil should not be disposed in rivers, lakes and water bodies;- Exposed areas should be planted with suitable vegetation at the earliestopportunity following the GESU/DoR Manual on ’Vegetation Structures forStabilizing Highway Slopes- A Manual for Nepal’.• Compensatory Measures:- Provide adequate compensation to land and property damaged by spoilstorage and disposal;- Use well-covered spoil to build community facilities like playground orpark by reclaiming land in public area;- Use spoil in local road net and embankment construction works.Chapter 6-6 April 2007
Environmental and Social Management Frameworkf. Avoiding Hazards due to Water Flow DiversionAs discussed in Ch. 4, construction work for roads often implies water flowdiversion, with a number of induced sequential secondary impacts on both thebio-physical and socio-economic environment (e.g. fisheries). Adequatemitigation measures are therefore of paramount importance to ensureenvironmental soundness of such projects.• Preventive Measures:- Avoid alignments which are highly unstable fragile zones susceptible toerosion, and landslides;- Avoid alignments in the close vicinity of wetlands and sensitive waterbodies;- Wherever possible, drainage structures should be designed andconstructed to have minimum interference with and impact on the naturaldrainage patterns in the area;- Avoid surface water discharge onto farmlands or risky locations. Alwaysconsult local communities regarding location of drainage outfalls. Provideadequate protection measures like apron and walls at the disposal pointsto prevent scour and undercutting.- Do not divert water away from a natural watercourse unless it isabsolutely necessary or otherwise environmentally desirable;- Avoid blockage or diversion of natural channels due to construction ofroad embankment and disposal of spoils• Mitigative Measures:- Provide suitable water management and gully protection works, e.g.check-dam and bank protection, in the affected areas. In the hills andmountains, it is often necessary to extend these measures well outsidethe right of way, typically up to 500 m.- Flow speed control: Protect, conserve and promote ground vegetationincluding use of grasses (turfing) or replantation of trees which absorbssurface run-off, reduces overland water flow speed and providesprotection against erosion. Structures like riprap and other devices inwater channels and dispersal structures in main drains reduces waterspeed and can substantially reduce potential impacts at their dischargepoints;- Paving: section of gravel roads prone to erosion and likely to be a sourceof sediment can be paved to reduce amount of sediment produced. Thisis especially relevant near water crossings.g. Avoiding Hazards originating from Quarry and Borrow ActivitiesCollection of construction material may have long-term and sometimesirreversible effects, for example road-side borrow pits may pose increasedaccident risks, or if left unmanaged, may become filled with garbage andstagnant water being both an eyesore and source of breeding ground formosquitoes and other disease vectors.• Preventive Measures:- Always select sites which will not result in slope instability, erosion,disruption to natural drainage patterns, river bank cutting, destruction toforest/vegetation, damage to farmlands or other social economic culturalresources.- Borrow sites should be located away from cultivable lands andsettlements, drinking water intakes;- Quarry and borrow pit should be located in structurally stable area, even ifsome distance from construction site. In long run, unsound quarries andborrow pits can promote slides and further aggravate maintenance andtraffic flow resulting in higher overall costs.April 2007 Chapter 6-7
Page 2 and 3:
Government of NepalMinistry of Phys
Page 4 and 5:
TABLE OF CONTENTSEnvironmental & So
Page 6 and 7:
Environmental & Social Management F
Page 8 and 9:
Page 10 and 11:
Page 12 and 13:
Page 14:
Environmental and Social Management
Page 17 and 18:
Page 19 and 20:
Page 21 and 22:
Page 23 and 24:
Page 25 and 26:
Page 27 and 28:
Page 29 and 30:
Page 31 and 32:
Page 33 and 34:
Page 35 and 36:
Page 37 and 38:
Page 39 and 40:
Page 41 and 42:
Page 43 and 44:
Page 45 and 46:
Page 47 and 48:
Page 49 and 50:
Page 51 and 52:
Page 53 and 54:
Page 55 and 56:
Page 57 and 58:
Page 59 and 60:
Page 61 and 62:
Page 63 and 64:
Page 65 and 66:
Page 67 and 68:
Page 69 and 70:
Page 71 and 72: Environmental and Social Management
Page 121: Environmental and Social Management
Page 173 and 174:
Page 175 and 176:
Page 177 and 178:
Page 179 and 180:
Page 181 and 182:
Page 183 and 184:
Page 185 and 186:
Page 187 and 188:
Page 189 and 190:
Page 191 and 192:
show all

Environmental & Social Management Framework - About ...

You also want an ePaper? Increase the reach of your titles

Delete template?

Save as template?