Client: The Burghley Estate Trustees Title:

Estate Office, 61 St MartinsTel: 01743 355770 STAMFORD Project: Wakerley Quarry Date: 25/05/07Fax: 01743 357771 Lincolnshire, PE9 2LQ Plate: 1

Barkers Chambers Barker St Shrewsbury. UK. SY1 1SB

Waterbodies at former mineral workings

1) Waterbodies in former mineral workings at time of first site visit (14th March 2006)

2) Waterbody in former mineral workings at time of second site visit (22nd June 2006). The smaller waterbodies had disappeared and the larger waterbody had shrunk to

around 1/4 of the original size.

Photograph 2 taken from this point

ParametersCalculation type=Design rainfallCalculation mode=For a point SP 9385 9855Duration= 0.5 (hour)Fixed durat 0Return peri 2 (years)Annual max 0c d1 d3 e f

-0.025 0.345 0.232 0.31 2.514A design rainfall of 11.0 mm was calculated.

The data in the following table have been computed using sliding durations2 10 20 50 100

Duration Duration year rainfal year rainfal year rainfal year rainfal year rainfallminutes hours mm mm mm mm mm

30 0.5 10.97 20.32 25.72 34.89 43.8460 1 13.84 24.82 31.02 41.41 51.42

120 2 17.47 30.32 37.43 49.16 60.31240 4 22.05 37.04 45.15 58.36 70.73360 6 25.26 41.64 50.39 64.52 77.64480 8 27.83 45.24 54.48 69.28 82.96600 10 29.99 48.25 57.87 73.21 87.32720 12 31.89 50.86 60.8 76.59 91.06840 14 33.13 52.47 62.54 78.51 93.09960 16 34.25 53.9 64.1 80.21 94.89

1080 18 35.27 55.2 65.5 81.74 96.51200 20 36.21 56.38 66.78 83.13 97.971320 22 37.08 57.48 67.96 84.42 99.311440 24 37.89 58.5 69.05 85.6 100.55

Calculation of peak flows and water volumes, Phase 5, partially sub-watertable Runoff coefficient = 0.75

For 10 year return period Total catchment area = 11.8 Hectares

Storm Duration Rainfall Intensity Peak flow Total Flows Outflow (m3) for various pumping rates (l/s)Storage required (m3) for various pumping rates(hours) (mm/hr) (l/s) (m3) 10 25 75 10 l/s 25 l/s 75 l/s

0.5 40.6 423.3 762 18 45 135 743.9 716.9 626.91 24.8 610.2 2197 36 90 270 2160.6 2106.6 1926.62 15.1 371.5 2675 72 180 540 2602.8 2494.8 2134.84 9.2 226.3 3259 144 360 1080 3115.4 2899.4 2179.48 5.6 137.8 3968 288 720 2160 3680.0 3248.0 1808.012 4.2 103.3 4464 432 1080 3240 4032.0 3384.0 1224.016 3.4 83.7 4818 576 1440 4320 4242.3 3378.3 498.324 2.4 59.0 5102 864 2160 6480 4237.7 2941.7 -1378.3

For 50 year return period

Storm Duration Rainfall Intensity Peak flow Total Flows Outflow (m3) for various outflow rate (l/s) Storage required (m3) for various outflow rates (hours) (mm/hr) (l/s) (m3) 10 25 75 10 l/s 25 l/s 75 l/s

0.5 69.8 1717.3 3091 18 45 135 3073.1 3046.1 2956.11 41.4 1018.6 3667 36 90 270 3630.8 3576.8 3396.82 16.4 403.5 2905 72 180 540 2833.1 2725.1 2365.14 14.6 359.2 5173 144 360 1080 5028.5 4812.5 4092.58 8.9 219.0 6306 288 720 2160 6018.2 5586.2 4146.212 6.4 157.5 6802 432 1080 3240 6370.2 5722.2 3562.216 5 123.0 7086 576 1440 4320 6509.7 5645.7 2765.724 3.6 88.6 7653 864 2160 6480 6788.5 5492.5 0.0

For 100 year return period

Storm Duration Rainfall Intensity Peak flow Total Flows Outflow (m3) for various outflow rate (l/s) Storage required (m3) for various outflow rates (hours) (mm/hr) (l/s) (m3) 10 25 40 10 l/s 25 l/s 75 l/s

0.5 87.6 2155.2 3879 18 45 135 3861.4 3834.4 3744.41 51.4 1129.7 4067 36 90 270 4030.9 3976.9 3796.92 30.1 661.6 4763 72 180 540 4691.2 4583.2 4223.24 17.7 389.0 5602 144 360 1080 5457.9 5241.9 4521.98 10.4 228.6 6583 288 720 2160 6295.1 5863.1 4423.112 7.6 167.0 7216 432 1080 3240 6784.0 6136.0 3976.016 5.9 129.7 7469 576 1440 4320 6893.2 6029.2 3149.224 4.2 92.3 7976 864 2160 6480 7111.6 5815.6 0.0